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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Omschrijving Prijs 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-stocknr. 127-6548
FabrikantnummerAT27C040-90PU
FabrikantMicrochip
€ 4,675
Each (In a Pack of 2)
Aantal stuks
4Mbit 512K x 8 bit - 90ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - +85 °C -
RS-stocknr. 127-4062
FabrikantnummerAT27C020-90PU
FabrikantMicrochip
€ 3,265
Each (In a Pack of 2)
Aantal stuks
- - - - - - - - - - - - - -
RS-stocknr. 127-6554
FabrikantnummerAT27C1024-70PU
FabrikantMicrochip
€ 3,26
Each (In a Pack of 2)
Aantal stuks
1Mbit 64K x 16 bit - 70ns - OTP - Through Hole PDIP 40 52.57 x 13.97 x 4.44mm - +85 °C -
RS-stocknr. 137-698
FabrikantnummerDS1982-F5+
FabrikantMaxim Integrated
€ 3,03
Each
Aantal stuks
1kbit - - - - - - - F5 MicroCan 2 17.35 (Dia.) x 5.89mm - +85 °C -
RS-stocknr. 127-6545
FabrikantnummerAT27C040-70JU
FabrikantMicrochip
€ 4,54
Each (In a Pack of 2)
Aantal stuks
4Mbit 512K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS-stocknr. 127-6558
FabrikantnummerAT27C256R-70JU
FabrikantMicrochip
€ 1,794
Each (In a Pack of 5)
Aantal stuks
256kbit 32K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS-stocknr. 127-6562
FabrikantnummerAT27C4096-90PU
FabrikantMicrochip
€ 6,48
Each
Aantal stuks
4Mbit 256K x 16 bit - 90ns - OTP - Through Hole PDIP 40 52.57 x 13.97 x 4.44mm - +85 °C -
RS-stocknr. 127-4048
FabrikantnummerAT27C010-70JU
FabrikantMicrochip
€ 2,466
Each (In a Pack of 5)
Aantal stuks
1Mbit 128K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS-stocknr. 190-6082
FabrikantnummerDS2502R+T&R
FabrikantMaxim Integrated
€ 1,057
Each (On a Reel of 3000)
Aantal stuks
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-stocknr. 127-6550
FabrikantnummerAT27C080-90PU
FabrikantMicrochip
€ 10,15
Each
Aantal stuks
8Mbit 1M x 8 bit - 90ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - +85 °C -
RS-stocknr. 127-6547
FabrikantnummerAT27C040-90JU
FabrikantMicrochip
€ 4,505
Each (In a Pack of 2)
Aantal stuks
4Mbit 512K x 8 bit - 90ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - +85 °C -
RS-stocknr. 177-1449
FabrikantnummerAT27LV512A-90JU
FabrikantMicrochip
€ 2,149
Each (In a Tube of 32)
Aantal stuks
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-stocknr. 177-1720
FabrikantnummerAT27C2048-55JU
FabrikantMicrochip
€ 3,93
Each (In a Pack of 2)
Aantal stuks
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-stocknr. 127-4058
FabrikantnummerAT27C020-55PU
FabrikantMicrochip
€ 3,295
Each (In a Pack of 2)
Aantal stuks
2Mbit 256K x 8 bit - 55ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - +85 °C -
RS-stocknr. 190-6989
FabrikantnummerDS2502R+T&R
FabrikantMaxim Integrated
€ 1,684
Each (In a Pack of 5)
Aantal stuks
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-stocknr. 127-6561
FabrikantnummerAT27C4096-90JU
FabrikantMicrochip
€ 6,32
Each
Aantal stuks
4Mbit 256K x 16 bit - 90ns - OTP - Through Hole PLCC 44 16.66 x 16.66 x 4.06mm - +85 °C -
RS-stocknr. 127-6557
FabrikantnummerAT27C256R-45PU
FabrikantMicrochip
€ 1,97
Each (In a Pack of 5)
Aantal stuks
256kbit 32K x 8 bit - 45ns - OTP - Through Hole PDIP 28 37.33 x 13.97 x 4.44mm - +85 °C -
RS-stocknr. 189-9375
FabrikantnummerDS1982-F5+
FabrikantMaxim Integrated
€ 2,98
Each (In a Pack of 5)
Aantal stuks
1kbit - - - - - - - F5 MicroCan 2 17.35 (Dia.) x 5.89mm - +85 °C -
RS-stocknr. 177-1448
FabrikantnummerAT27LV010A-70JU
FabrikantMicrochip
€ 2,498
Each (In a Tube of 32)
Aantal stuks
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-stocknr. 127-6546
FabrikantnummerAT27C040-70PU
FabrikantMicrochip
€ 4,715
Each (In a Pack of 2)
Aantal stuks
4Mbit 512K x 8 bit - 70ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - +85 °C -