25C320T-E/SN EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 25C320T-E/SN is a 32Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology in an 8-SOIC surface mount package. This non-volatile memory device operates at 3 MHz clock frequency with a 4.5V to 5.5V supply voltage range and supports industrial temperature operation from -40°C to 125°C. The part is ROHS3 compliant and carries an active product status with verified programmability through DiGi-Electronics.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when design requirements demand enhanced performance specifications (such as higher clock frequency or extended temperature range), or when alternative manufacturers' components offer superior availability or cost optimization while maintaining functional compatibility.

Key Parameters

Parameter	Value
Memory Size	32Kbit
Memory Organization	4K x 8
Memory Interface	SPI
Clock Frequency	3 MHz
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Write Cycle Time	5ms
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution compatibility for the 25C320T-E/SN is determined by the following mandatory parameters:

Memory capacity: 32Kbit (4K x 8 organization)
Interface protocol: SPI
Package: 8-SOIC form factor with 0.154" width (3.90mm)
Surface mount technology
Non-volatile EEPROM technology

Substitute parts must maintain these core specifications. Secondary parameters including clock frequency, supply voltage range, operating temperature range, and write cycle time may vary within acceptable design margins. Parts with higher clock frequencies, wider voltage ranges, or extended temperature ratings are forward-compatible with the 25C320T-E/SN application space. Parts with lower performance specifications require design verification for the target application.

Parameter Comparison

Part Number	Manufacturer	Clock Frequency (MHz)	Voltage Supply (V)	Operating Temperature (°C)	Write Cycle Time (ms)	Product Status	Programmable Verified
25C320T-E/SN	Microchip Technology	3	4.5 ~ 5.5	-40 ~ 125	5	Active	Yes
25LC320AT-E/SN	Microchip Technology	10	2.5 ~ 5.5	-40 ~ 125	5	Active	Yes
25LC320AT-H/SN	Microchip Technology	5	2.5 ~ 5.5	-40 ~ 150	6	Active	No
25LC320T-E/SN	Microchip Technology	2	2.5 ~ 5.5	-40 ~ 125	5	Active	Yes
AT25320B-SSHL-T	Microchip Technology	20	1.8 ~ 5.5	-40 ~ 85	5	Active	Yes
CAT25320VI-GT3	onsemi	10	1.8 ~ 5.5	-40 ~ 85	5	Active	No
CAV25320VE-GT3	onsemi	10	2.5 ~ 5.5	-40 ~ 125	5	Active	No
M95320-DFMN6TP	STMicroelectronics	20	1.7 ~ 5.5	-40 ~ 85	5	Active	No
M95320-DRMN3TP/K	STMicroelectronics	20	1.8 ~ 5.5	-40 ~ 125	4	Active	No
M95320-DRMN8TP/K	STMicroelectronics	20	1.8 ~ 5.5	-40 ~ 105	4	Active	No
M95320-RMN6TP	STMicroelectronics	20	1.8 ~ 5.5	-40 ~ 85	5	Active	No

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance, confirming long-term availability and environmental regulatory alignment with the 25C320T-E/SN.

For applications requiring verified programmability through DiGi-Electronics, select from: 25LC320AT-E/SN, 25LC320T-E/SN, or AT25320B-SSHL-T. These parts carry confirmed programmable verification status.

For applications operating within the original 4.5V to 5.5V supply voltage window, the 25C320T-E/SN, 25LC320AT-E/SN, 25LC320AT-H/SN, and 25LC320T-E/SN remain compatible. Parts from onsemi and STMicroelectronics extend the lower voltage boundary to 1.8V or 1.7V, enabling operation in low-power system designs.

For applications requiring extended temperature operation beyond 125°C, the 25LC320AT-H/SN supports -40°C to 150°C. For applications with upper temperature limits of 85°C or 105°C, AT25320B-SSHL-T, CAT25320VI-GT3, M95320-DFMN6TP, and M95320-RMN6TP are suitable.

Automotive-grade parts with AEC-Q100 qualification are available as CAV25320VE-GT3 (onsemi) and M95320-DRMN3TP/K and M95320-DRMN8TP/K (STMicroelectronics) for applications requiring automotive reliability standards.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a higher clock frequency than the 25C320T-E/SN?

A: Yes. The 25C320T-E/SN operates at 3 MHz. Substitute parts with 5 MHz, 10 MHz, or 20 MHz clock frequencies are forward-compatible, as they support the same SPI protocol and memory organization. The higher frequency capability does not degrade performance in applications designed for lower speeds.

Q: What is the minimum voltage requirement for substitute selection?

A: The 25C320T-E/SN requires 4.5V minimum supply voltage. Substitute parts with lower minimum voltage specifications (2.5V, 1.8V, or 1.7V) are compatible with 4.5V to 5.5V applications. However, if your application operates below 4.5V, only substitute parts with matching or lower minimum voltage are suitable.

Q: Are all substitute parts available in the same 8-SOIC package?

A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring mechanical and electrical compatibility with the 25C320T-E/SN PCB footprint.

Q: Which substitute parts are qualified for automotive applications?

A: CAV25320VE-GT3 (onsemi), M95320-DRMN3TP/K, and M95320-DRMN8TP/K (STMicroelectronics) carry AEC-Q100 automotive qualification. These parts are suitable for automotive-grade system designs.

Q: What is the difference between verified and non-verified programmable status?

A: Verified programmable status indicates DiGi-Electronics has confirmed the part's programmability through testing. Non-verified parts have not undergone this specific verification process. For applications requiring confirmed programmability assurance, select verified parts: 25LC320AT-E/SN, 25LC320T-E/SN, or AT25320B-SSHL-T.

Q: Can I substitute a part with a longer write cycle time?

A: The 25C320T-E/SN has a 5ms write cycle time. Most substitute parts maintain this specification. M95320-DRMN3TP/K and M95320-DRMN8TP/K offer 4ms write cycle time, which is faster and fully compatible. Parts with longer write cycle times may impact system performance and require design verification.

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