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 Prix 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
N° de stock RS 177-1447
Référence fabricantAT27C2048-55JU
MarqueMicrochip
3,785 €
Each (In a Tube of 27)
Unité
2Mbit 128K x 16 bit Parallel 55ns - OTP - Surface Mount PLCC 44 16.66 x 16.66 x 4.06mm 5 V +85 °C -
N° de stock RS 127-6562
Référence fabricantAT27C4096-90PU
MarqueMicrochip
5,89 €
Each
Unité
4Mbit 256K x 16 bit - 90ns - OTP - Through Hole PDIP 40 52.57 x 13.97 x 4.44mm - +85 °C -
N° de stock RS 178-4839
Référence fabricantAT27C020-55PU
MarqueMicrochip
2,997 €
Each (In a Tube of 12)
Unité
2Mbit 256K x 8 bit - 55ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - +85 °C -
N° de stock RS 127-4061
Référence fabricantAT27C020-90JU
MarqueMicrochip
2,775 €
Each (In a Pack of 2)
Unité
2Mbit 256K x 8 bit - 90ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
N° de stock RS 127-6558
Référence fabricantAT27C256R-70JU
MarqueMicrochip
1,632 €
Each (In a Pack of 5)
Unité
256kbit 32K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
N° de stock RS 189-7486
Référence fabricantDS1982-F5+
2,361 €
Each (In a Bag of 100)
Unité
1kbit - - - - - - - F5 MicroCan 2 17.35 (Dia.) x 5.89mm - +85 °C -
N° de stock RS 127-6545
Référence fabricantAT27C040-70JU
MarqueMicrochip
4,13 €
Each (In a Pack of 2)
Unité
4Mbit 512K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
N° de stock RS 127-6566
Référence fabricantAT27C512R-70PU
MarqueMicrochip
1,92 €
Each (In a Pack of 5)
Unité
512kbit 64K x 8 bit - 70ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm - +85 °C -
N° de stock RS 192-1512
Référence fabricantDS2502S+
2,232 €
Each (In a Pack of 5)
Unité
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
N° de stock RS 127-4058
Référence fabricantAT27C020-55PU
MarqueMicrochip
2,995 €
Each (In a Pack of 2)
Unité
2Mbit 256K x 8 bit - 55ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - +85 °C -
N° de stock RS 177-1449
Référence fabricantAT27LV512A-90JU
MarqueMicrochip
1,954 €
Each (In a Tube of 32)
Unité
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
N° de stock RS 540-4845
Référence fabricantDS2505+
2,41 €
Each
Unité
16kbit - - - - - - Through Hole TO-92 3 - - +85 °C -
N° de stock RS 127-6563
Référence fabricantAT27C512R-45JU
MarqueMicrochip
1,854 €
Each (In a Pack of 5)
Unité
512kbit 64K x 8 bit - 45ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
N° de stock RS 127-6556
Référence fabricantAT27C256R-45JU
MarqueMicrochip
1,676 €
Each (In a Pack of 5)
Unité
256kbit 32K x 8 bit - 45ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
N° de stock RS 127-6548
Référence fabricantAT27C040-90PU
MarqueMicrochip
4,25 €
Each (In a Pack of 2)
Unité
4Mbit 512K x 8 bit - 90ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - +85 °C -
N° de stock RS 169-8318
Référence fabricantDS2502+
1,684 €
Each (In a Tube of 10)
Unité
1kbit - - - - - - Through Hole TO-92 3 4.95 (Dia.) x 3.94mm - +85 °C -
N° de stock RS 127-6552
Référence fabricantAT27C1024-45PU
MarqueMicrochip
3,015 €
Each (In a Pack of 2)
Unité
1Mbit 64K x 16 bit - 45ns - OTP - Through Hole PDIP 40 52.57 x 13.97 x 4.44mm - +85 °C -
N° de stock RS 127-6559
Référence fabricantAT27C256R-70PU
MarqueMicrochip
1,744 €
Each (In a Pack of 5)
Unité
256kbit 32K x 8 bit - 70ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm - +85 °C -
N° de stock RS 192-1255
Référence fabricantDS2502S+
1,762 €
Each (In a Tube of 100)
Unité
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
N° de stock RS 137-519
Référence fabricantDS1982-F3+
2,87 €
Each
Unité
1kbit - - - - - - - F3 MicroCan 2 17.36 (Dia.) x 3.1mm - +85 °C -