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 Minimum Operating Supply Voltage Number of Bits per Word
RS Stock No. 127-6548
Mfr. Part No.AT27C040-90PU
BrandMicrochip
€8.835
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 - - 8bit
RS Stock No. 177-1855
Mfr. Part No.AT27LV512A-90JU
BrandMicrochip
€2.414
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 3 (Low Voltage) V 8bit
RS Stock No. 192-1512
Mfr. Part No.DS2502S+
€2.548
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 2.8 V 1bit
RS Stock No. 127-6553
Mfr. Part No.AT27C1024-70JU
BrandMicrochip
€3.30
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 - - 16bit
RS Stock No. 127-4061
Mfr. Part No.AT27C020-90JU
BrandMicrochip
€3.30
Each (In a Pack of 2)
units
2Mbit 256K x 8 bit - 90ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - - 8bit
RS Stock No. 177-1447
Mfr. Part No.AT27C2048-55JU
BrandMicrochip
€4.413
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 - 16bit
RS Stock No. 127-6558
Mfr. Part No.AT27C256R-70JU
BrandMicrochip
€1.944
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 - - 8bit
RS Stock No. 127-6556
Mfr. Part No.AT27C256R-45JU
BrandMicrochip
€1.966
Each (In a Pack of 5)
units
256kbit 32K x 8 bit - 45ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - - 8bit
RS Stock No. 127-4058
Mfr. Part No.AT27C020-55PU
BrandMicrochip
€4.25
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 - - 8bit
RS Stock No. 189-7486
Mfr. Part No.DS1982-F5+
€3.293
Each (In a Bag of 100)
units
1kbit - - - - - - - F5 MicroCan 2 17.35 (Dia.) x 5.89mm - - -
RS Stock No. 169-8318
Mfr. Part No.DS2502+
€1.887
Each (In a Tube of 10)
units
1kbit - - - - - - Through Hole TO-92 3 4.95 (Dia.) x 3.94mm - - -
RS Stock No. 127-6554
Mfr. Part No.AT27C1024-70PU
BrandMicrochip
€3.45
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 - - 16bit
RS Stock No. 127-6559
Mfr. Part No.AT27C256R-70PU
BrandMicrochip
€2.036
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 - - 8bit
RS Stock No. 127-6565
Mfr. Part No.AT27C512R-70JU
BrandMicrochip
€2.148
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 - - 8bit
RS Stock No. 540-4839
Mfr. Part No.DS2502+
€2.06
Each
units
1kbit - - - - - - Through Hole TO-92 3 4.95 (Dia.) x 3.94mm - - -
RS Stock No. 178-4839
Mfr. Part No.AT27C020-55PU
BrandMicrochip
€4.173
Each (In a Tube of 12)
units
2Mbit 256K x 8 bit - 55ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - - 8bit
RS Stock No. 177-1739
Mfr. Part No.AT27LV010A-70JU
BrandMicrochip
€2.72
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 3 (Low Voltage) V 8bit
RS Stock No. 190-6081
Mfr. Part No.DS2502P-E48+T&R
€1.685
Each (On a Reel of 4000)
units
1024bit - 1-Wire - - OTP - Surface Mount TSOC 6 4 x 3.89 x 1.34mm 6 V 2.8 V -
RS Stock No. 177-1448
Mfr. Part No.AT27LV010A-70JU
BrandMicrochip
€2.938
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 3 (Low Voltage) V 8bit
RS Stock No. 189-9478
Mfr. Part No.DS2505+
€2.846
Each (In a Pack of 5)
units
16kbit - - - - - - Through Hole TO-92 3 - - - -