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 that 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, EEPROM chips can erase blocks of data instead of the entire chip only.

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 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. 127-6560
Mfr. Part No.AT27C4096-55JU
BrandMicrochip
TWD257.00
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. 127-4058
Mfr. Part No.AT27C020-55PU
BrandMicrochip
TWD132.00
Each (In a Pack of 2)
units
2Mbit 256K x 8 bit - 55ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - +85 °C -
RS Stock No. 127-6553
Mfr. Part No.AT27C1024-70JU
BrandMicrochip
TWD122.50
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. 190-6081
Mfr. Part No.DS2502P-E48+T&R
TWD64.20
Each (On a Reel of 4000)
units
1024bit - 1-Wire - - OTP - Surface Mount TSOC 6 4 x 3.89 x 1.34mm 6 V +85 °C 2.8 V
RS Stock No. 189-9478
Mfr. Part No.DS2505+
TWD101.60
Each (In a Pack of 5)
units
16kbit - - - - - - Through Hole TO-92 3 - - +85 °C -
RS Stock No. 127-4047
Mfr. Part No.AT27C010-45JU
BrandMicrochip
TWD107.20
Each (In a Pack of 5)
units
1Mbit 128K x 8 bit - 45ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS Stock No. 786-0818
Mfr. Part No.DS2502P+
TWD82.80
Each (In a Pack of 5)
units
1kbit - - - - - - Surface Mount TSOC 6 4 x 3.89 x 1.5mm - +85 °C -
RS Stock No. 192-1255
Mfr. Part No.DS2502S+
TWD69.90
Each (In a Tube of 100)
units
1kbit 1K x 1 bit 1-Wire 120µs 11.5V OTP In System Surface Mount SOIC 8 5 x 4 x 1.5mm 6 V +85 °C 2.8 V
RS Stock No. 127-6563
Mfr. Part No.AT27C512R-45JU
BrandMicrochip
TWD73.20
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. 189-7490
Mfr. Part No.DS2505+
TWD85.60
Each (In a Bag of 2000)
units
16kbit - - - - - - Through Hole TO-92 3 - - +85 °C -
RS Stock No. 190-6965
Mfr. Part No.DS2502P-E48+T&R
TWD100.40
Each (In a Pack of 5)
units
48bit - 1-Wire - - OTP - Surface Mount TSOC - - 6 V +85 °C 2.8 V
RS Stock No. 189-9375
Mfr. Part No.DS1982-F5+
TWD121.60
Each (In a Pack of 5)
units
1kbit - - - - - - - F5 MicroCan 2 17.35 (Dia.) x 5.89mm - +85 °C -
RS Stock No. 177-1855
Mfr. Part No.AT27LV512A-90JU
BrandMicrochip
TWD88.80
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
TWD254.00
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. 127-6564
Mfr. Part No.AT27C512R-45PU
BrandMicrochip
TWD86.80
Each (In a Pack of 5)
units
512kbit 64K x 8 bit - 45ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm - +85 °C -
RS Stock No. 190-6989
Mfr. Part No.DS2502R+T&R
TWD64.80
Each (In a Pack of 5)
units
1kbit - 1-Wire - 12 V @ 10 mA - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 6 V +85 °C 2.8 V
RS Stock No. 540-4845
Mfr. Part No.DS2505+
TWD99.00
Each
units
16kbit - - - - - - Through Hole TO-92 3 - - +85 °C -
RS Stock No. 127-4051
Mfr. Part No.AT27C020-55JU
BrandMicrochip
TWD112.00
Each (In a Pack of 2)
units
2Mbit 256K x 8 bit - 55ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS Stock No. 192-1512
Mfr. Part No.DS2502S+
TWD93.20
Each (In a Pack of 5)
units
1kbit 1K x 1 bit 1-Wire 120µs 11.5V OTP In System Surface Mount SOIC 8 5 x 4 x 1.5mm 6 V +85 °C 2.8 V
RS Stock No. 540-4839
Mfr. Part No.DS2502+
TWD77.00
Each
units
1kbit - - - - - - Through Hole TO-92 3 4.95 (Dia.) x 3.94mm - +85 °C -