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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RS-artikelnummer 127-4062
Tillv. art.nrAT27C020-90PU
VarumärkeMicrochip
34,82 kr
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Tillv. art.nrAT27LV512A-90JU
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21,542 kr
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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-artikelnummer 127-6556
Tillv. art.nrAT27C256R-45JU
VarumärkeMicrochip
19,664 kr
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256kbit 32K x 8 bit - 45ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS-artikelnummer 169-8318
Tillv. art.nrDS2502+
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1kbit - - - - - - Through Hole TO-92 3 4.95 (Dia.) x 3.94mm - +85 °C -
RS-artikelnummer 127-6557
Tillv. art.nrAT27C256R-45PU
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21,008 kr
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256kbit 32K x 8 bit - 45ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm - +85 °C -
RS-artikelnummer 192-1254
Tillv. art.nrDS1982-F3+
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1kbit - - - - - - - F3 MicroCan 2 17.36 (Dia.) x 3.1mm - +85 °C -
RS-artikelnummer 127-6558
Tillv. art.nrAT27C256R-70JU
VarumärkeMicrochip
19,132 kr
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256kbit 32K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS-artikelnummer 127-6562
Tillv. art.nrAT27C4096-90PU
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69,10 kr
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4Mbit 256K x 16 bit - 90ns - OTP - Through Hole PDIP 40 52.57 x 13.97 x 4.44mm - +85 °C -
RS-artikelnummer 127-4047
Tillv. art.nrAT27C010-45JU
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26,83 kr
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1Mbit 128K x 8 bit - 45ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS-artikelnummer 127-6566
Tillv. art.nrAT27C512R-70PU
VarumärkeMicrochip
22,522 kr
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512kbit 64K x 8 bit - 70ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm - +85 °C -
RS-artikelnummer 127-4058
Tillv. art.nrAT27C020-55PU
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35,14 kr
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2Mbit 256K x 8 bit - 55ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - +85 °C -
RS-artikelnummer 189-7486
Tillv. art.nrDS1982-F5+
VarumärkeMaxim Integrated
25,14 kr
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1kbit - - - - - - - F5 MicroCan 2 17.35 (Dia.) x 5.89mm - +85 °C -
RS-artikelnummer 127-6548
Tillv. art.nrAT27C040-90PU
VarumärkeMicrochip
49,855 kr
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4Mbit 512K x 8 bit - 90ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - +85 °C -
RS-artikelnummer 137-698
Tillv. art.nrDS1982-F5+
VarumärkeMaxim Integrated
31,33 kr
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1kbit - - - - - - - F5 MicroCan 2 17.35 (Dia.) x 5.89mm - +85 °C -
RS-artikelnummer 192-1255
Tillv. art.nrDS2502S+
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18,768 kr
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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-artikelnummer 189-9478
Tillv. art.nrDS2505+
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25,24 kr
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16kbit - - - - - - Through Hole TO-92 3 - - +85 °C -
RS-artikelnummer 127-6550
Tillv. art.nrAT27C080-90PU
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108,24 kr
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8Mbit 1M x 8 bit - 90ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - +85 °C -
RS-artikelnummer 189-7490
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16kbit - - - - - - Through Hole TO-92 3 - - +85 °C -
RS-artikelnummer 127-4049
Tillv. art.nrAT27C010-70PU
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28,004 kr
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1Mbit 128K x 8 bit - 70ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - +85 °C -
RS-artikelnummer 127-6553
Tillv. art.nrAT27C1024-70JU
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1Mbit 64K x 16 bit - 70ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm - +85 °C -