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庫存編號 127-4061
製造零件編號AT27C020-90JU
BrandMicrochip
HK$38.265
/個 (每包:2個)
單位
2Mbit 256K x 8 bit - 90ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - - 8bit
RS庫存編號 189-9375
製造零件編號DS1982-F5+
HK$47.66
/個 (每包:5個)
單位
1kbit - - - - - - - F5 MicroCan 2 17.35 (Dia.) x 5.89mm - - -
RS庫存編號 127-4062
製造零件編號AT27C020-90PU
BrandMicrochip
HK$48.605
/個 (每包:2個)
單位
2000kbit 256K x 8 - 55ns 5V OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - - 8bit
RS庫存編號 177-1739
製造零件編號AT27LV010A-70JU
BrandMicrochip
HK$34.126
/個 (每包:5個)
單位
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庫存編號 127-6546
製造零件編號AT27C040-70PU
BrandMicrochip
HK$102.485
/個 (每包:2個)
單位
4Mbit 512K x 8 bit - 70ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - - 8bit
RS庫存編號 127-6550
製造零件編號AT27C080-90PU
BrandMicrochip
HK$126.52
單位
8Mbit 1M x 8 bit - 90ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - - 8bit
RS庫存編號 169-8319
製造零件編號DS2505+
HK$27.565
毎管:10 個
單位
16kbit - - - - - - Through Hole TO-92 3 - - - -
RS庫存編號 127-6558
製造零件編號AT27C256R-70JU
BrandMicrochip
HK$23.022
/個 (每包:5個)
單位
256kbit 32K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - - 8bit
RS庫存編號 127-6556
製造零件編號AT27C256R-45JU
BrandMicrochip
HK$23.222
/個 (每包:5個)
單位
256kbit 32K x 8 bit - 45ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - - 8bit
RS庫存編號 190-6965
製造零件編號DS2502P-E48+T&R
HK$31.506
/個 (每包:5個)
單位
48bit - 1-Wire - - OTP - Surface Mount TSOC - - 6 V 2.8 V -
RS庫存編號 177-1447
製造零件編號AT27C2048-55JU
BrandMicrochip
HK$54.127
毎管:27 個
單位
2Mbit 128K x 16 bit Parallel 55ns - OTP - Surface Mount PLCC 44 16.66 x 16.66 x 4.06mm 5 V - 16bit
RS庫存編號 127-6545
製造零件編號AT27C040-70JU
BrandMicrochip
HK$74.425
/個 (每包:2個)
單位
4Mbit 512K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - - 8bit
RS庫存編號 189-7490
製造零件編號DS2505+
HK$22.916
個 (以毎袋:2000)
單位
16kbit - - - - - - Through Hole TO-92 3 - - - -
RS庫存編號 127-6552
製造零件編號AT27C1024-45PU
BrandMicrochip
HK$40.90
/個 (每包:2個)
單位
1Mbit 64K x 16 bit - 45ns - OTP - Through Hole PDIP 40 52.57 x 13.97 x 4.44mm - - 16bit
RS庫存編號 177-1720
製造零件編號AT27C2048-55JU
BrandMicrochip
HK$54.125
/個 (每包:2個)
單位
2Mbit 128K x 16 bit Parallel 55ns - OTP - Surface Mount PLCC 44 16.66 x 16.66 x 4.06mm 5 V - 16bit
RS庫存編號 127-4047
製造零件編號AT27C010-45JU
BrandMicrochip
HK$31.40
/個 (每包:5個)
單位
1Mbit 128K x 8 bit - 45ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - - 8bit
RS庫存編號 127-4048
製造零件編號AT27C010-70JU
BrandMicrochip
HK$30.798
/個 (每包:5個)
單位
1Mbit 128K x 8 bit - 70ns - OTP - Through Hole PLCC 32 14.04 x 11.5 x 3.17mm - - 8bit
RS庫存編號 177-1855
製造零件編號AT27LV512A-90JU
BrandMicrochip
HK$27.872
/個 (每包:5個)
單位
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庫存編號 127-6554
製造零件編號AT27C1024-70PU
BrandMicrochip
HK$39.99
/個 (每包:2個)
單位
1Mbit 64K x 16 bit - 70ns - OTP - Through Hole PDIP 40 52.57 x 13.97 x 4.44mm - - 16bit
RS庫存編號 127-6548
製造零件編號AT27C040-90PU
BrandMicrochip
HK$102.39
/個 (每包:2個)
單位
4Mbit 512K x 8 bit - 90ns - OTP - Through Hole PDIP 32 42.29 x 13.97 x 4.44mm - - 8bit