AT24CS16-MAHM-T Equivalent & Substitute Parts

Part Overview

The AT24CS16-MAHM-T is a 16Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface operation at 1 MHz with 550 ns access time. The device is housed in an 8-UDFN (2x3) package with exposed pad and is supplied in Tape & Reel packaging. This part is currently in active production status with 1032 units in stock.

Substitute parts become necessary when the primary part number experiences supply constraints, packaging format changes, or when alternative speed grades or temperature ratings better match application requirements. The substitute parts listed maintain core electrical compatibility while offering variations in clock frequency, access time, operating temperature range, and packaging formats.

Key Parameters

Parameter	AT24CS16-MAHM-T
Memory Size	16Kbit
Memory Organization	2K x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5 ms
Voltage Supply Range	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-UDFN (2x3) Exposed Pad
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the AT24CS16-MAHM-T is determined by the following critical parameters:

Core Compatibility Requirements:

Memory Size: 16Kbit (fixed)
Memory Organization: 2K x 8 (fixed)
Memory Interface: I2C (fixed)
Write Cycle Time: 5 ms (fixed)
Voltage Supply Range: Must encompass or be compatible with 1.7V ~ 5.5V
Mounting Type: Surface Mount (fixed)
RoHS Status: ROHS3 Compliant (fixed)

Variable Parameters Allowing Substitution:

Clock Frequency: 1 MHz (primary) to 400 kHz (substitute) — lower frequency is backward compatible
Access Time: 550 ns (primary) to 900 ns (substitute) — longer access time is acceptable in non-time-critical applications
Operating Temperature: -40°C ~ 85°C (primary) to -40°C ~ 125°C (substitute) — extended range is compatible
Package Format: 8-UDFN, 8-DFN, 8-TDFN, 8-VFDFN, 8-WFDFN — all are 8-pin DFN variants with 2x3 footprint
Packaging Type: Tape & Reel (TR), Cut Tape (CT), Tube — logistics variation only
Moisture Sensitivity Level: 3 (168 Hours) to 1 (Unlimited) — lower MSL is compatible

All substitute parts maintain the same memory capacity, organization, interface protocol, and write performance as the primary part. Differences in clock frequency and access time represent performance trade-offs that do not affect functional compatibility in I2C-based applications where timing margins are not critical.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package Type	Packaging Format	MSL	Inventory
AT24CS16-MAHM-T	Microchip Technology	16Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-UDFN	Tape & Reel	3	1032
24AA16-I/MC	Microchip Technology	16Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-DFN	Tube	1	1502
24AA16HT-I/MNY	Microchip Technology	16Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TDFN	Tape & Reel	1	4110
24AA16T-I/MC	Microchip Technology	16Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-DFN	Cut Tape & Digi-Reel	1	1300
24AA16T-I/MNY	Microchip Technology	16Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TDFN	Cut Tape	1	11085
24LC16B-E/MC	Microchip Technology	16Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-DFN	Tube	1	33400
24LC16B-I/MC	Microchip Technology	16Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-DFN	Tube	1	3050
24LC16BHT-I/MNY	Microchip Technology	16Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TDFN	Tape & Reel	1	3259
24LC16BT-E/MNY	Microchip Technology	16Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TDFN	Cut Tape & Digi-Reel	1	1000200
24LC16BT-I/MC	Microchip Technology	16Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-DFN	Tape & Reel	1	2108
24LC16BT-I/MNY	Microchip Technology	16Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TDFN	Cut Tape & Digi-Reel	1	3300

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The 24AA16 series (24AA16-I/MC, 24AA16HT-I/MNY, 24AA16T-I/MC, 24AA16T-I/MNY) maintains full voltage compatibility with the AT24CS16-MAHM-T across the 1.7V ~ 5.5V range. These parts operate at 400 kHz with 900 ns access time, representing a performance reduction that remains functionally transparent in standard I2C applications. All are ROHS3 compliant with MSL rating of 1, indicating superior moisture resistance. The 24AA16HT-I/MNY and 24AA16T-I/MNY offer the highest inventory availability (4110 and 11085 units respectively) and are available in Tape & Reel and Cut Tape formats matching the primary part's packaging preference.

Secondary Substitutes (Voltage Constraint):

The 24LC16B series (24LC16B-E/MC, 24LC16B-I/MC, 24LC16BHT-I/MNY, 24LC16BT-E/MNY, 24LC16BT-I/MC, 24LC16BT-I/MNY) operates at a minimum supply voltage of 2.5V, which restricts use in applications requiring operation below 2.5V. These parts are suitable only for systems with supply voltage floors at or above 2.5V. The 24LC16BT-E/MNY provides exceptional inventory depth (1,000,200 units) and supports extended operating temperature to 125°C. The 24LC16B-E/MC also supports the extended temperature range and offers 33,400 units in stock.

Product Status and Compliance:

All substitute parts maintain Active product status and ROHS3 compliance. The 24AA16T-I/MC and 24LC16BT-I/MC are verified as DiGi-Electronics Programmable, providing additional qualification assurance. All parts carry identical ECCN (EAR99) and HTSUS (8542.32.0051) classifications as the primary part.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 kHz substitute part in place of the 1 MHz AT24CS16-MAHM-T?

A: Yes. The 400 kHz parts are functionally compatible. I2C bus timing is determined by the master controller, not the slave device. A 400 kHz-rated slave operates correctly on a 1 MHz bus. The lower clock rating indicates the maximum frequency the device guarantees, not a minimum requirement.

Q: What is the difference between 8-DFN, 8-TDFN, 8-UDFN, and 8-WFDFN packages?

A: All are 8-pin DFN variants with identical 2x3 mm footprints and pin configurations. The letter designations (U, T, V, W) indicate manufacturer-specific package variants. PCB layout compatibility is maintained across all variants for this product family. Verify footprint dimensions with the specific datasheet before layout finalization.

Q: Why do some substitutes have a 2.5V minimum voltage while the primary part specifies 1.7V?

A: The 24LC16B series is rated for 2.5V ~ 5.5V operation, restricting use to applications with supply voltages at or above 2.5V. If your application requires operation below 2.5V, select from the 24AA16 series, which maintains the 1.7V ~ 5.5V range of the primary part.

Q: What does MSL 3 versus MSL 1 mean for component handling?

A: MSL (Moisture Sensitivity Level) 3 requires baking at 125°C for 24 hours after 168 hours of exposure to 85°C/85% RH conditions. MSL 1 components have unlimited shelf life without baking requirements. Substitute parts with MSL 1 offer simplified logistics and storage procedures.

Q: Are the 24AA16 and 24LC16B parts pin-compatible with the AT24CS16-MAHM-T?

A: Yes. All parts in this comparison maintain identical I2C pinout: SDA, SCL, VSS, VCC, and NC (no connect) pins in the same positions across all 8-pin DFN variants.

Q: Which substitute offers the best inventory availability?

A: The 24LC16BT-E/MNY provides 1,000,200 units in stock, significantly exceeding all other options. If voltage compatibility at 2.5V minimum is acceptable, this part offers maximum supply assurance. For applications requiring 1.7V operation, the 24AA16T-I/MNY offers 11,085 units.

Q: Can I mix different substitute parts in the same design?

A: Yes, provided all selected parts meet your application's voltage and temperature requirements. Mixing 24AA16 and 24LC16B series in the same design requires careful supply voltage management, as 24LC16B parts cannot operate below 2.5V.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message