EPROM

EPROM stands for erasable programmable read-only memory, and is a type of solid state memory chip. EPROM is a type of non-volatile ROM memory which retains data after the power has been switched off. EPROM ICs are used within circuits to add memory capabilities.

The basic transistor device in an EPROM chip is different from the normal MOS transistor. A floating gate avalanche injection MOS transistor is used. There are two gates to this MOS transistor and one gate is a floating gate, meaning that it has no electrical connection to that gate.

EPROM varies from other types of programmable ROM memory as, when you erase data, the entire memory is removed. EEPROM is another memory chip with erasable data. However, it can erase blocks of data instead.

Where are EPROM chips used?

  • Computer memory
  • Compact flash
  • USB sticks
  • Microcontrollers

How is EPROM memory erased?

EPROM ICs can be programmed and then erased by using a UV light. They feature a transparent quartz window on top of the package. The memory in an EPROM device is erased by applying UV light to the window at the top of the package. General indoor lighting will not contain enough UV light to effect it. However, outdoor light could cause memory to be erased. Therefore many chip windows are protected and covered by a label.

Once the chip is exposed to UV light, the electrons in the floating gate get excited. The high energy that they acquire allows them to overcome the silicon dioxide barrier and move over to the silicon substrate or the control gate. Once they do this you are reducing the threshold voltage. This can take up to 30 minutes, after which the electrons move out from the floating gate and then it is ready for reprogramming.


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Description Price Memory Size Organisation Interface Type Maximum Random Access Time Programming Voltage Reprogramming Technique In System Programmability Mounting Type Package Type Pin Count Dimensions Maximum Operating Supply Voltage Maximum Operating Temperature Minimum Operating Supply Voltage
RS stock no. 177-1855
Mfr. Part No.AT27LV512A-90JU
BrandMicrochip
R 40.93
Each (In a Pack of 5)
units
512kbit 64K x 8 bit Parallel 90ns - OTP - Surface Mount PLCC 32 14.04 x 11.5 x 3.17mm 3.6 (Low Voltage) V, 5 (Standard) V +85 °C 3 (Low Voltage) V
RS stock no. 127-6561
Mfr. Part No.AT27C4096-90JU
BrandMicrochip
R 112.27
Each
units
4Mbit 256K x 16 bit - 90ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm - +85 °C -
RS stock no. 127-4062
Mfr. Part No.AT27C020-90PU
BrandMicrochip
R 59.67
Each (In a Pack of 2)
units
- - - - - - - - - - - - - -
RS stock no. 127-6551
Mfr. Part No.AT27C1024-45JU
BrandMicrochip
R 55.005
Each (In a Pack of 2)
units
1Mbit 64K x 16 bit - 45ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm - +85 °C -
RS stock no. 127-6553
Mfr. Part No.AT27C1024-70JU
BrandMicrochip
R 53.93
Each (In a Pack of 2)
units
1Mbit 64K x 16 bit - 70ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm - +85 °C -
RS stock no. 177-1448
Mfr. Part No.AT27LV010A-70JU
BrandMicrochip
R 41.091
Each (In a Tube of 32)
units
1Mbit 128K x 8 bit Parallel 70ns - OTP - Surface Mount PLCC 32 14.04 x 11.5 x 3.17mm 3.6 (Low Voltage) V, 5 (Standard) V +85 °C 3 (Low Voltage) V
RS stock no. 127-6550
Mfr. Part No.AT27C080-90PU
BrandMicrochip
R 180.47
Each
units
8Mbit 1M x 8 bit - 90ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - +85 °C -
RS stock no. 127-6554
Mfr. Part No.AT27C1024-70PU
BrandMicrochip
R 59.205
Each (In a Pack of 2)
units
1Mbit 64K x 16 bit - 70ns - OTP - Through Hole PDIP 40 52.57 x 13.97 x 4.44mm - +85 °C -
RS stock no. 127-4049
Mfr. Part No.AT27C010-70PU
BrandMicrochip
R 48.386
Each (In a Pack of 5)
units
1Mbit 128K x 8 bit - 70ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - +85 °C -
RS stock no. 127-6547
Mfr. Part No.AT27C040-90JU
BrandMicrochip
R 79.785
Each (In a Pack of 2)
units
4Mbit 512K x 8 bit - 90ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS stock no. 127-6565
Mfr. Part No.AT27C512R-70JU
BrandMicrochip
R 35.152
Each (In a Pack of 5)
units
512kbit 64K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS stock no. 127-6563
Mfr. Part No.AT27C512R-45JU
BrandMicrochip
R 36.194
Each (In a Pack of 5)
units
512kbit 64K x 8 bit - 45ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS stock no. 127-6558
Mfr. Part No.AT27C256R-70JU
BrandMicrochip
R 31.678
Each (In a Pack of 5)
units
256kbit 32K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS stock no. 127-6546
Mfr. Part No.AT27C040-70PU
BrandMicrochip
R 85.15
Each (In a Pack of 2)
units
4Mbit 512K x 8 bit - 70ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - +85 °C -
RS stock no. 127-6566
Mfr. Part No.AT27C512R-70PU
BrandMicrochip
R 102.838
Each (In a Pack of 5)
units
512kbit 64K x 8 bit - 70ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm - +85 °C -
RS stock no. 127-6555
Mfr. Part No.AT27C2048-90JU
BrandMicrochip
R 62.635
Each (In a Pack of 2)
units
2Mbit 128K x 16 bit - 90ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm - +85 °C -
RS stock no. 127-6548
Mfr. Part No.AT27C040-90PU
BrandMicrochip
R 84.505
Each (In a Pack of 2)
units
4Mbit 512K x 8 bit - 90ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - +85 °C -
RS stock no. 127-6560
Mfr. Part No.AT27C4096-55JU
BrandMicrochip
R 113.78
Each
units
4Mbit 256K x 16 bit - 55ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm - +85 °C -
RS stock no. 127-6559
Mfr. Part No.AT27C256R-70PU
BrandMicrochip
R 37.398
Each (In a Pack of 5)
units
256kbit 32K x 8 bit - 70ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm - +85 °C -
RS stock no. 127-6562
Mfr. Part No.AT27C4096-90PU
BrandMicrochip
R 115.60
Each
units
4Mbit 256K x 16 bit - 90ns - OTP - Through Hole PDIP 40 52.57 x 13.97 x 4.44mm - +85 °C -