- Manufacture :
-
- ON Semiconductor (174)
- Texas Instruments (44)
- ABLIC U.S.A. Inc. (7)
- Alliance Memory, Inc. (21)
- Cypress Semiconductor Corp (87)
- Fremont Micro Devices USA (15)
- Fujitsu Electronics America, Inc. (3)
- Honeywell Microelectronics & Precision Sensors (3)
- IDT, Integrated Device Technology Inc (413)
- Intersil (4)
- Macronix (1)
- Microchip Technology (1159)
- Parallax Inc. (4)
- Rohm Semiconductor (43)
- Sharp Microelectronics (5)
- STMicroelectronics (142)
- Winbond Electronics (27)
- NXP USA Inc. (8)
- Maxim Integrated (268)
- Operating Temperature :
- Package / Case :
-
- 10-DIP (0.300", 7.62mm) (1)
- 108-BPGA (18)
- 14-DIP (0.300", 7.62mm) (1)
- 16-DIP (0.300", 7.62mm) (3)
- 165-BFCCGA (10)
- 18-DIP (0.300", 7.62mm) (3)
- 20-DIP (0.300", 7.62mm) (1)
- 22-DIP (0.300", 7.62mm) (1)
- 24-CDIP (0.300", 7.62mm) (17)
- 24-CDIP (0.300", 7.62mm) Window (1)
- 24-CDIP (0.600", 15.24mm) (16)
- 24-DIP (0.300", 7.62mm) (35)
- 24-DIP (0.600", 15.24mm) (22)
- 24-DIP (0.600", 15.24mm) Window (4)
- 24-DIP Module (0.600", 15.24mm) (37)
- 28-BCPGA (19)
- 28-CDIP (0.300", 7.62mm) (48)
- 28-CDIP (0.600", 15.24mm) (55)
- 28-CDIP (0.600", 15.24mm) Window (47)
- 28-DIP (0.300", 7.62mm) (45)
- 28-DIP (0.600", 15.24mm) (185)
- 28-DIP Module (0.600", 15.24mm) (82)
- 28-DIP Module (0.61", 15.49mm) (21)
- 30-BCPGA (5)
- 32-CDIP (0.300", 7.62mm) (5)
- 32-CDIP (0.600", 15.24mm) (4)
- 32-CDIP (0.600", 15.24mm) Window (35)
- 32-CDIP (0.685", 17.40mm) Window (8)
- 32-DIP (0.600", 15.24mm) (249)
- 32-DIP Module (0.600", 15.24mm) (82)
- 32-DIP Module (0.61", 15.49mm) (16)
- 36-DIP Module (2)
- 36-DIP Module (0.600", 15.24mm) (35)
- 36-DIP Module (0.610", 15.49mm) (3)
- 40-CDIP (0.600", 15.24mm) Window (6)
- 40-DIP (0.600", 15.24mm) (38)
- 40-DIP Module (0.610", 15.495mm) (15)
- 42-CDIP (0.600", 15.24mm) Window (6)
- 42-DIP (1)
- 42-DIP (0.600", 15.24mm) (5)
- 42-SDIP (0.600", 15.24mm) (2)
- 48-DIP (0.600", 15.24mm) (98)
- 5-SIP Module (2)
- 56-BCPGA (2)
- 68-BPGA (84)
- 8-DIP (0.300", 7.62mm) (943)
- 84-BPGA (68)
- TO-226-2, TO-92-2 (TO-226AC) (1)
- TO-226-3, TO-92-3 (TO-226AA) (22)
- TO-226-3, TO-92-3 (TO-226AA) (Formed Leads) (16)
- TO-226-3, TO-92-3 Long Body (3)
- Supplier Device Package :
-
- 10-PDIP (1)
- 108-PGA (30.48x30.48) (18)
- 14-DIP (1)
- 16-DIP (3)
- 165-CCGA (21x25) (10)
- 18-DIP (2)
- 18-PDIP (1)
- 20-DIP (1)
- 22-DIP (1)
- 24-CDIP (33)
- 24-CERDIP (1)
- 24-DIP (7)
- 24-EDIP (30)
- 24-PCDIP, CAPHAT® (6)
- 24-PDIP (55)
- 28-CDIP (94)
- 28-CDIP Frit Seal with Window (22)
- 28-CerDip (33)
- 28-CPGA (13.55x15.06) (19)
- 28-DIP (31)
- 28-DIP Module (18.42x37.72) (21)
- 28-EDIP (75)
- 28-PCDIP, CAPHAT® (7)
- 28-PDIP (200)
- 30-CPGA (5)
- 32-CDIP (25)
- 32-CDIP Frit Seal with Window (27)
- 32-DIP (204)
- 32-DIP Module (18.42x42.8) (12)
- 32-DIP Module (18.42x52.96) (4)
- 32-EDIP (74)
- 32-PDIP (45)
- 32-PMDIP (4)
- 32-PMDIP Module (4)
- 36-DIP Module (18.42x52.96) (3)
- 36-EDIP (35)
- 36-PLDIP Module (2)
- 40-CDIP Frit Seal with Window (6)
- 40-EDIP (15)
- 40-PDIP (38)
- 42-CDIP Frit Seal with Window (6)
- 42-PDIP (6)
- 42-SDIP (2)
- 48-PDIP (48)
- 48-SIDE BRAZED (50)
- 56-CPGA (2)
- 68-PGA (29.46x29.46) (84)
- 8-DIP (111)
- 8-DIP-T (31)
- 8-PDIP (801)
- 84-PGA (27.94x27.94) (68)
- TO-92-2 (1)
- TO-92-3 (41)
- Voltage - Supply :
-
- 1.5 V ~ 3.6 V (6)
- 1.6 V ~ 5.5 V (18)
- 1.7 V ~ 1.9 V (10)
- 1.7 V ~ 1.95 V (2)
- 1.7 V ~ 2.2 V (4)
- 1.7 V ~ 3 V (1)
- 1.7 V ~ 3.6 V (8)
- 1.7 V ~ 5.5 V (65)
- 1.8 V ~ 3.6 V (23)
- 1.8 V ~ 5.5 V (216)
- 1.8 V ~ 6 V (3)
- 2 V ~ 3.6 V (2)
- 2.2 V ~ 5.5 V (3)
- 2.3 V ~ 3.6 V (2)
- 2.5 V ~ 5.5 V (243)
- 2.5 V ~ 6 V (1)
- 2.5 V ~ 6.0 V (11)
- 2.65 V ~ 5.5 V (4)
- 2.7 V ~ 3.6 V (59)
- 2.7 V ~ 5.5 V (145)
- 2.8 V ~ 5.25 V (2)
- 2.97 V ~ 3.63 V (2)
- 3 V ~ 15 V (1)
- 3 V ~ 3.6 V (90)
- 3 V ~ 5.25 V (2)
- 3.14 V ~ 3.47 V (3)
- 4.5 V ~ 5.5 V (1340)
- 4.5 V ~ 6 V (2)
- 4.75 V ~ 5.25 V (108)
- 4.75 V ~ 5.5 V (22)
- Memory Type :
- Memory Size :
-
- 1.5K (6 pages x 32 bytes) (1)
- 128b (16 x 8) (8)
- 128Kb (16K x 8) (58)
- 128Kb (8K x 16) (24)
- 128Mb (16M x 8) (5)
- 16Kb (16K x 1) (4)
- 16Kb (1K x 16) (7)
- 16Kb (2K x 8) (286)
- 16Kb (2K x 8, 1K x 16) (19)
- 16Kb (4K x 4) (1)
- 16Mb (2M x 8) (24)
- 16Mb (2M x 8, 1M x 16) (7)
- 1Kb (128 x 8 , 64 x 16) (11)
- 1Kb (128 x 8 or 64 x 16) (1)
- 1Kb (128 x 8) (86)
- 1Kb (128 x 8, 64 x 16) (27)
- 1Kb (1K x 1) (9)
- 1Kb (256 x 4) (4)
- 1Kb (256b x 4 pages) (3)
- 1Kb (64 x 16) (22)
- 1Mb (128K x 8) (184)
- 1Mb (64K x 16) (13)
- 20Kb (256 x 80) (2)
- 256b (16 x 16) (13)
- 256b (32 x 8) (6)
- 256b (64 x 4) (1)
- 256Kb (16K x 16) (13)
- 256Kb (256K x 1) (2)
- 256Kb (32K x 8) (320)
- 256Kb (64K x 4) (1)
- 2Kb (128 x 16) (16)
- 2Kb (128 x 8 x 2) (2)
- 2Kb (256 x 8) (112)
- 2Kb (256 x 8, 128 x 16) (34)
- 2Mb (128K x 16) (25)
- 2Mb (256K x 8) (122)
- 32Kb (2K x 16) (38)
- 32Kb (4K x 8) (75)
- 32Mb (2M x 16) (5)
- 32Mb (4M x 8) (6)
- 4Kb (1K x 4) (2)
- 4Kb (256 x 16) (21)
- 4Kb (256 x 8 x 2) (12)
- 4Kb (4K x 1) (2)
- 4Kb (512 x 8) (73)
- 4Kb (512 x 8, 256 x 16) (24)
- 4Mb (256K x 16) (19)
- 4Mb (512K x 8) (81)
- 4Mb (512K x 8, 256K x 16) (1)
- 512Kb (32K x 16) (6)
- 512Kb (64K x 8) (97)
- 64b (16 x 4) (3)
- 64Kb (4K x 16) (25)
- 64Kb (64K x 1) (2)
- 64Kb (8K x 8) (267)
- 64Mb (8M x 8) (4)
- 72Kb (8K x 9) (1)
- 72Mb (2M x 36) (5)
- 72Mb (4M x 18) (5)
- 8Kb (1K x 8) (109)
- 8Kb (1K x 8, 512 x 16) (10)
- 8Kb (256 x 8 x 4) (9)
- 8Kb (512 x 16) (6)
- 8Mb (1M x 8) (40)
- 8Mb (1M x 8, 512K x 16) (2)
- Memory Format :
- Write Cycle Time - Word, Page :
-
- 1.5ms (4)
- 100ns (252)
- 10ms (343)
- 10µs (1)
- 120ns (201)
- 12ns (4)
- 130ns (2)
- 150ns (211)
- 15ms (16)
- 15ns (38)
- 170ns (4)
- 17ns (16)
- 1ms (33)
- 200ns (117)
- 200µs (16)
- 20ns (110)
- 20µs (3)
- 25ns (150)
- 29ns (2)
- 2ms (34)
- 30ns (4)
- 35ns (231)
- 3ms (44)
- 40µs (2)
- 4ms (8)
- 50ns (5)
- 50µs (96)
- 50µs, 3ms (5)
- 55ns (202)
- 5ms (584)
- 6ms (37)
- 800µs (2)
- 85ns (82)
- 8ms (3)
- 90ms (2)
- Applied Filters :
2428 results
Picture | Mfr Part # | Unit Price | QUANTITY | Inventory | MANUFACTURE | Description | Package | Series | Part Status | Packaging | Technology | Operating Temperature | Mounting Type | Package / Case | Supplier Device Package | Voltage - Supply | Memory Type | Memory Size | Access Time | Clock Frequency | Memory Format | Write Cycle Time - Word, Page | Memory Interface | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
GLOBAL STOCKS | ||||||||||||||||||||||||
|
|
RFQ |
3,406
In-stock
|
STMicroelectronics | IC OTP 1MBIT 70NS 32DIP | - | Obsolete | Tube | EPROM - OTP | 0°C ~ 70°C (TA) | Through Hole | 32-DIP (0.600", 15.24mm) | 32-PDIP | 4.5 V ~ 5.5 V | Non-Volatile | 1Mb (128K x 8) | 70ns | - | EPROM | - | Parallel | |||
|
|
RFQ |
5,972
In-stock
|
STMicroelectronics | IC EPROM UV 1MBIT 45NS 32CDIP | - | Obsolete | Tube | EPROM - UV | 0°C ~ 70°C (TA) | Through Hole | 32-CDIP (0.600", 15.24mm) Window | 32-CDIP Frit Seal with Window | 4.75 V ~ 5.25 V | Non-Volatile | 1Mb (128K x 8) | 45ns | - | EPROM | - | Parallel | |||
|
|
RFQ |
5,483
In-stock
|
STMicroelectronics | IC OTP 1MBIT 45NS 32DIP | - | Obsolete | Tube | EPROM - OTP | 0°C ~ 70°C (TA) | Through Hole | 32-DIP (0.600", 15.24mm) | 32-PDIP | 4.75 V ~ 5.25 V | Non-Volatile | 1Mb (128K x 8) | 45ns | - | EPROM | - | Parallel | |||
|
|
RFQ |
4,880
In-stock
|
STMicroelectronics | IC EEPROM 64KBIT 400KHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-PDIP | 2.5 V ~ 5.5 V | Non-Volatile | 64Kb (8K x 8) | 450ns | 1MHz | EEPROM | 5ms | I²C | |||
|
|
RFQ |
4,263
In-stock
|
STMicroelectronics | IC EEPROM 32KBIT 400KHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-PDIP | 2.5 V ~ 5.5 V | Non-Volatile | 32Kb (4K x 8) | 450ns | 1MHz | EEPROM | 5ms | I²C | |||
|
|
RFQ |
5,848
In-stock
|
STMicroelectronics | IC EEPROM 32KBIT 400KHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-PDIP | 2.5 V ~ 5.5 V | Non-Volatile | 32Kb (4K x 8) | 450ns | 1MHz | EEPROM | 5ms | I²C | |||
|
|
RFQ |
5,733
In-stock
|
STMicroelectronics | IC EEPROM 16KBIT 400KHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-PDIP | 2.5 V ~ 5.5 V | Non-Volatile | 16Kb (2K x 8) | 900ns | 400kHz | EEPROM | 5ms | I²C | |||
|
|
RFQ |
4,165
In-stock
|
STMicroelectronics | IC EEPROM 16KBIT 400KHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-PDIP | 2.5 V ~ 5.5 V | Non-Volatile | 16Kb (2K x 8) | 900ns | 400kHz | EEPROM | 5ms | I²C | |||
|
|
RFQ |
5,800
In-stock
|
STMicroelectronics | IC EEPROM 16KBIT 400KHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-PDIP | 1.8 V ~ 5.5 V | Non-Volatile | 16Kb (2K x 8) | 900ns | 400kHz | EEPROM | 5ms | I²C | |||
|
|
RFQ |
4,082
In-stock
|
STMicroelectronics | IC EEPROM 8KBIT 400KHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-PDIP | 2.5 V ~ 5.5 V | Non-Volatile | 8Kb (1K x 8) | 900ns | 400kHz | EEPROM | 5ms | I²C | |||
|
|
RFQ |
3,885
In-stock
|
STMicroelectronics | IC EEPROM 8KBIT 400KHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-PDIP | 2.5 V ~ 5.5 V | Non-Volatile | 8Kb (1K x 8) | 900ns | 400kHz | EEPROM | 5ms | I²C | |||
|
|
RFQ |
3,102
In-stock
|
STMicroelectronics | IC EEPROM 4KBIT 400KHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-PDIP | 2.5 V ~ 5.5 V | Non-Volatile | 4Kb (512 x 8) | 900ns | 400kHz | EEPROM | 5ms | I²C | |||
|
|
RFQ |
5,070
In-stock
|
STMicroelectronics | IC EEPROM 4KBIT 400KHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-PDIP | 2.5 V ~ 5.5 V | Non-Volatile | 4Kb (512 x 8) | 900ns | 400kHz | EEPROM | 5ms | I²C | |||
|
|
RFQ |
3,960
In-stock
|
STMicroelectronics | IC EEPROM 1KBIT 400KHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-PDIP | 2.5 V ~ 5.5 V | Non-Volatile | 1Kb (128 x 8) | 900ns | 400kHz | EEPROM | 5ms | I²C | |||
|
|
RFQ |
2,962
In-stock
|
STMicroelectronics | IC EEPROM 1KBIT 400KHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-PDIP | 2.5 V ~ 5.5 V | Non-Volatile | 1Kb (128 x 8) | 900ns | 400kHz | EEPROM | 5ms | I²C | |||
|
|
RFQ |
5,601
In-stock
|
ABLIC U.S.A. Inc. | IC EEPROM 4KBIT 2MHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-DIP | 1.8 V ~ 5.5 V | Non-Volatile | 4Kb (256 x 16) | - | 2MHz | EEPROM | 8ms | SPI | |||
|
|
RFQ |
5,190
In-stock
|
ABLIC U.S.A. Inc. | IC EEPROM 2KBIT 2MHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-DIP | 1.8 V ~ 5.5 V | Non-Volatile | 2Kb (128 x 16) | - | 2MHz | EEPROM | 8ms | SPI | |||
|
|
RFQ |
3,636
In-stock
|
ABLIC U.S.A. Inc. | IC EEPROM 1KBIT 2MHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-DIP | 1.8 V ~ 5.5 V | Non-Volatile | 1Kb (64 x 16) | - | 2MHz | EEPROM | 8ms | SPI | |||
|
|
RFQ |
4,995
In-stock
|
ABLIC U.S.A. Inc. | IC EEPROM 16KBIT 400KHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-DIP | 1.8 V ~ 5.5 V | Non-Volatile | 16Kb (2K x 8) | 900ns | 400kHz | EEPROM | 10ms | I²C | |||
|
|
RFQ |
4,620
In-stock
|
ABLIC U.S.A. Inc. | IC EEPROM 8KBIT 400KHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-DIP | 1.8 V ~ 5.5 V | Non-Volatile | 8Kb (1K x 8) | 900ns | 400kHz | EEPROM | 10ms | I²C | |||
|
|
RFQ |
2,946
In-stock
|
ABLIC U.S.A. Inc. | IC EEPROM 4KBIT 400KHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-DIP | 1.8 V ~ 5.5 V | Non-Volatile | 4Kb (512 x 8) | 900ns | 400kHz | EEPROM | 10ms | I²C | |||
|
|
RFQ |
2,781
In-stock
|
ABLIC U.S.A. Inc. | IC EEPROM 2KBIT 400KHZ 8DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-DIP | 1.8 V ~ 5.5 V | Non-Volatile | 2Kb (256 x 8) | 900ns | 400kHz | EEPROM | 10ms | I²C | |||
|
|
RFQ |
3,409
In-stock
|
ON Semiconductor | IC EEPROM 4KBIT 2MHZ 8DIP | - | Active | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-PDIP | 1.8 V ~ 5.5 V | Non-Volatile | 4Kb (512 x 8, 256 x 16) | - | 2MHz | EEPROM | - | SPI | |||
|
|
RFQ |
5,838
In-stock
|
ON Semiconductor | IC EEPROM 2KBIT 1MHZ 8DIP | - | Active | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 8-DIP (0.300", 7.62mm) | 8-PDIP | 1.8 V ~ 5.5 V | Non-Volatile | 2Kb (256 x 8, 128 x 16) | - | 2MHz | EEPROM | - | SPI | |||
|
|
RFQ |
3,142
In-stock
|
ON Semiconductor | IC FLASH 512KBIT 120NS 32DIP | - | Obsolete | Tube | Flash | -40°C ~ 85°C (TA) | Through Hole | 32-DIP (0.600", 15.24mm) | 32-PDIP | 4.5 V ~ 5.5 V | Non-Volatile | 512Kb (64K x 8) | 120ns | - | Flash | 120ns | Parallel | |||
|
|
RFQ |
3,297
In-stock
|
ON Semiconductor | IC FLASH 2MBIT 120NS 32DIP | - | Obsolete | Tube | Flash | -40°C ~ 85°C (TA) | Through Hole | 32-DIP (0.600", 15.24mm) | 32-PDIP | 4.5 V ~ 5.5 V | Non-Volatile | 2Mb (256K x 8) | 120ns | - | Flash | 120ns | Parallel | |||
|
|
RFQ |
2,736
In-stock
|
ON Semiconductor | IC FLASH 1MBIT 120NS 32DIP | - | Obsolete | Tube | Flash | -40°C ~ 85°C (TA) | Through Hole | 32-DIP (0.600", 15.24mm) | 32-PDIP | 4.5 V ~ 5.5 V | Non-Volatile | 1Mb (128K x 8) | 120ns | - | Flash | 120ns | Parallel | |||
|
|
RFQ |
5,350
In-stock
|
ON Semiconductor | IC FLASH 1MBIT 120NS 32DIP | - | Obsolete | Tube | Flash | -40°C ~ 85°C (TA) | Through Hole | 32-DIP (0.600", 15.24mm) | 32-PDIP | 4.5 V ~ 5.5 V | Non-Volatile | 1Mb (128K x 8) | 120ns | - | Flash | 120ns | Parallel | |||
|
|
RFQ |
3,752
In-stock
|
ON Semiconductor | IC EEPROM 64KBIT 120NS 28DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 28-DIP (0.600", 15.24mm) | 28-PDIP | 4.5 V ~ 5.5 V | Non-Volatile | 64Kb (8K x 8) | 120ns | - | EEPROM | 5ms | Parallel | |||
|
|
RFQ |
4,341
In-stock
|
ON Semiconductor | IC EEPROM 512KBIT 120NS 32DIP | - | Obsolete | Tube | EEPROM | -40°C ~ 85°C (TA) | Through Hole | 32-DIP (0.600", 15.24mm) | 32-PDIP | 4.5 V ~ 5.5 V | Non-Volatile | 512Kb (64K x 8) | 120ns | - | EEPROM | 5ms | Parallel |