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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Beskrivning Pris Memory Size Organisation Interface Type Maximum Random Access Time Programming Voltage Reprogramming Technique Mounting Type Package Type Pin Count Dimensions Maximum Operating Supply Voltage
RS-artikelnummer 177-1855
Tillv. art.nrAT27LV512A-90JU
VarumärkeMicrochip
32,846 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
RS-artikelnummer 127-4047
Tillv. art.nrAT27C010-45JU
VarumärkeMicrochip
36,898 kr
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1Mbit 128K x 8 bit - 45ns - OTP Through Hole PLCC 32 14.04 x 11.5 x 3.17mm -
RS-artikelnummer 177-1447
Tillv. art.nrAT27C2048-55JU
VarumärkeMicrochip
63,53 kr
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2Mbit 128K x 16 bit Parallel 55ns - OTP Surface Mount PLCC 44 16.66 x 16.66 x 4.06mm 5 V
RS-artikelnummer 127-4051
Tillv. art.nrAT27C020-55JU
VarumärkeMicrochip
46,39 kr
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2Mbit 256K x 8 bit - 55ns - OTP Through Hole PLCC 32 14.04 x 11.5 x 3.17mm -
RS-artikelnummer 177-1448
Tillv. art.nrAT27LV010A-70JU
VarumärkeMicrochip
40,063 kr
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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
RS-artikelnummer 127-4049
Tillv. art.nrAT27C010-70PU
VarumärkeMicrochip
48,458 kr
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1Mbit 128K x 8 bit - 70ns - OTP Through Hole PDIP 32 42.29 x 13.97 x 4.44mm -
RS-artikelnummer 127-4062
Tillv. art.nrAT27C020-90PU
VarumärkeMicrochip
56,945 kr
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2000kbit 256K x 8 - 55ns 5V OTP Through Hole PDIP 32 42.29 x 13.97 x 4.44mm -
RS-artikelnummer 127-6548
Tillv. art.nrAT27C040-90PU
VarumärkeMicrochip
120,825 kr
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4Mbit 512K x 8 bit - 90ns - OTP Through Hole PDIP 32 42.29 x 13.97 x 4.44mm -
RS-artikelnummer 177-1739
Tillv. art.nrAT27LV010A-70JU
VarumärkeMicrochip
40,246 kr
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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
RS-artikelnummer 127-6557
Tillv. art.nrAT27C256R-45PU
VarumärkeMicrochip
29,048 kr
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256kbit 32K x 8 bit - 45ns - OTP Through Hole PDIP 28 37.33 x 13.97 x 4.44mm -
RS-artikelnummer 127-4061
Tillv. art.nrAT27C020-90JU
VarumärkeMicrochip
45,16 kr
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2Mbit 256K x 8 bit - 90ns - OTP Through Hole PLCC 32 14.04 x 11.5 x 3.17mm -
RS-artikelnummer 178-4839
Tillv. art.nrAT27C020-55PU
VarumärkeMicrochip
58,199 kr
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2Mbit 256K x 8 bit - 55ns - OTP Through Hole PDIP 32 42.29 x 13.97 x 4.44mm -
RS-artikelnummer 127-6547
Tillv. art.nrAT27C040-90JU
VarumärkeMicrochip
86,11 kr
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4Mbit 512K x 8 bit - 90ns - OTP Through Hole PLCC 32 14.04 x 11.5 x 3.17mm -
RS-artikelnummer 177-1449
Tillv. art.nrAT27LV512A-90JU
VarumärkeMicrochip
32,542 kr
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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
RS-artikelnummer 127-6551
Tillv. art.nrAT27C1024-45JU
VarumärkeMicrochip
45,91 kr
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1Mbit 64K x 16 bit - 45ns - OTP Through Hole PLCC 44 16.66 x 16.66 x 4.06mm -
RS-artikelnummer 127-6563
Tillv. art.nrAT27C512R-45JU
VarumärkeMicrochip
30,158 kr
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512kbit 64K x 8 bit - 45ns - OTP Through Hole PLCC 32 14.04 x 11.5 x 3.17mm -
RS-artikelnummer 127-6556
Tillv. art.nrAT27C256R-45JU
VarumärkeMicrochip
27,514 kr
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256kbit 32K x 8 bit - 45ns - OTP Through Hole PLCC 32 14.04 x 11.5 x 3.17mm -
RS-artikelnummer 189-9402
Tillv. art.nrDS2502+
VarumärkeMaxim Integrated
38,22 kr
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1kbit - - - - - Through Hole TO-92 3 4.95 (Dia.) x 3.94mm -
RS-artikelnummer 127-6546
Tillv. art.nrAT27C040-70PU
VarumärkeMicrochip
121,675 kr
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4Mbit 512K x 8 bit - 70ns - OTP Through Hole PDIP 32 42.29 x 13.97 x 4.44mm -
RS-artikelnummer 127-6564
Tillv. art.nrAT27C512R-45PU
VarumärkeMicrochip
31,864 kr
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512kbit 64K x 8 bit - 45ns - OTP Through Hole PDIP 28 37.33 x 13.97 x 4.44mm -