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. 177-1447
Mfr. Part No.AT27C2048-55JU
BrandMicrochip
TWD166.90
Each (In a Tube of 27)
units
2Mbit 128K x 16 bit Parallel 55ns - OTP - Surface Mount PLCC 44 16.66 x 16.66 x 4.06mm 5 V +85 °C -
RS Stock No. 127-6554
Mfr. Part No.AT27C1024-70PU
BrandMicrochip
TWD129.00
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. 190-6989
Mfr. Part No.DS2502R+T&R
TWD65.20
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. 127-6545
Mfr. Part No.AT27C040-70JU
BrandMicrochip
TWD182.00
Each (In a Pack of 2)
units
4Mbit 512K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS Stock No. 127-6550
Mfr. Part No.AT27C080-90PU
BrandMicrochip
TWD407.00
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. 127-6552
Mfr. Part No.AT27C1024-45PU
BrandMicrochip
TWD140.00
Each (In a Pack of 2)
units
1Mbit 64K x 16 bit - 45ns - OTP - Through Hole PDIP 40 52.57 x 13.97 x 4.44mm - +85 °C -
RS Stock No. 177-1449
Mfr. Part No.AT27LV512A-90JU
BrandMicrochip
TWD85.80
Each (In a Tube of 32)
units
512kbit 64K x 8 bit Parallel 90ns 6.5V 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. 177-1739
Mfr. Part No.AT27LV010A-70JU
BrandMicrochip
TWD108.80
Each (In a Pack of 5)
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. 127-4047
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. 177-1720
Mfr. Part No.AT27C2048-55JU
BrandMicrochip
TWD173.00
Each (In a Pack of 2)
units
2Mbit 128K x 16 bit Parallel 55ns - OTP - Surface Mount PLCC 44 16.66 x 16.66 x 4.06mm 5 V +85 °C -
RS Stock No. 192-1254
Mfr. Part No.DS1982-F3+
TWD99.40
Each (In a Bag of 100)
units
1kbit - - - - - - - F3 MicroCan 2 17.36 (Dia.) x 3.1mm - +85 °C -
RS Stock No. 190-6082
Mfr. Part No.DS2502R+T&R
TWD46.00
Each (On a Reel of 3000)
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. 169-8319
Mfr. Part No.DS2505+
TWD89.50
Each (In a Tube of 10)
units
16kbit - - - - - - Through Hole TO-92 3 - - +85 °C -
RS Stock No. 189-9375
Mfr. Part No.DS1982-F5+
TWD133.20
Each (In a Pack of 5)
units
1kbit - - - - - - - F5 MicroCan 2 17.35 (Dia.) x 5.89mm - +85 °C -
RS Stock No. 189-9478
Mfr. Part No.DS2505+
TWD103.20
Each (In a Pack of 5)
units
16kbit - - - - - - Through Hole TO-92 3 - - +85 °C -
RS Stock No. 137-698
Mfr. Part No.DS1982-F5+
TWD133.00
Each
units
1kbit - - - - - - - F5 MicroCan 2 17.35 (Dia.) x 5.89mm - +85 °C -
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. 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. 127-6557
Mfr. Part No.AT27C256R-45PU
BrandMicrochip
TWD93.60
Each (In a Pack of 5)
units
256kbit 32K x 8 bit - 45ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm - +85 °C -