FT24C16A-USR-T EEPROM 16Kbit I2C Equivalent & Substitute Parts

Part Overview

The FT24C16A-USR-T is a 16Kbit non-volatile EEPROM memory IC with I2C interface manufactured by Fremont Micro Devices Ltd. This device operates at 1 MHz clock frequency with 550 ns access time, packaged in 8-SOP surface mount configuration. The part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value
Memory Size	16Kbit
Memory Organization	2K x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the FT24C16A-USR-T is determined by strict equivalence in the following parameters:

Memory Size: 16Kbit
Memory Organization: 2K x 8
Memory Interface: I2C
Memory Format: EEPROM (Non-Volatile)
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Substitute parts are classified into two categories:

Parametric Equivalents: Parts from Fremont Micro Devices Ltd with identical electrical specifications and packaging, differing only in product status and packaging format (Tape & Reel vs. Tube).

Similar Parts: Microchip Technology 24AA16 and 24LC16B series devices that meet core memory and interface requirements but operate at reduced clock frequency (400 kHz vs. 1 MHz) and extended access time (900 ns vs. 550 ns). These parts maintain full I2C protocol compatibility and identical memory organization.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	Product Status
FT24C16A-USR-T	Fremont Micro Devices	16Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Discontinued
FT24C16A-ESG-T	Fremont Micro Devices	16Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
FT24C16A-ESR-T	Fremont Micro Devices	16Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24AA16-E/SN	Microchip Technology	16Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active
24AA16-I/SN	Microchip Technology	16Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24AA16H-I/SN	Microchip Technology	16Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24AA16HT-I/SN	Microchip Technology	16Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24AA16T-E/SN	Microchip Technology	16Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active
24AA16T-I/SN	Microchip Technology	16Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24LC16BH-E/SN	Microchip Technology	16Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active
24LC16BHT-E/SN	Microchip Technology	16Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active

Engineering Selection Recommendations

Primary Substitutes (Parametric Equivalents):

FT24C16A-ESG-T and FT24C16A-ESR-T are direct parametric equivalents from the same manufacturer with identical electrical specifications. Both parts are in active production status. Selection between these two depends on packaging format requirements: FT24C16A-ESG-T is supplied in Tape & Reel format with 954 units in stock, while FT24C16A-ESR-T is also Tape & Reel packaged with 5180 units in stock.

Secondary Substitutes (Microchip 24AA16 Series):

The Microchip 24AA16 series (24AA16-E/SN, 24AA16-I/SN, 24AA16H-I/SN, 24AA16HT-I/SN, 24AA16T-E/SN, 24AA16T-I/SN) provides functional substitution with the following considerations:

Clock frequency reduced to 400 kHz (vs. 1 MHz on FT24C16A-USR-T)
Access time extended to 900 ns (vs. 550 ns on FT24C16A-USR-T)
Voltage supply range: 1.7V ~ 5.5V (vs. 1.8V ~ 5.5V on FT24C16A-USR-T)
All parts are ROHS3 compliant and in active production
Multiple packaging options available (Tube, Tape & Reel, Cut Tape)

Tertiary Substitutes (Microchip 24LC16B Series):

The 24LC16BH-E/SN and 24LC16BHT-E/SN provide functional substitution with additional constraints:

Minimum voltage supply: 2.5V (vs. 1.8V on FT24C16A-USR-T)
Clock frequency: 400 kHz
Access time: 900 ns
Operating temperature range: -40°C ~ 125°C
ROHS3 compliant and in active production

Frequently Asked Questions (FAQ)

Q: Can FT24C16A-ESG-T and FT24C16A-ESR-T be used as direct replacements for FT24C16A-USR-T?

A: Yes. Both parts are parametric equivalents with identical electrical specifications, memory organization, I2C interface, and 8-SOIC packaging. The only differences are product status (both active vs. discontinued) and packaging format (Tape & Reel). No circuit modifications are required.

Q: What are the performance implications of using Microchip 24AA16 series instead of FT24C16A-USR-T?

A: The 24AA16 series operates at 400 kHz clock frequency (vs. 1 MHz) and has 900 ns access time (vs. 550 ns). These differences result in slower I2C communication and memory access. The parts are functionally compatible with I2C protocol but are not suitable for applications requiring the original 1 MHz performance specification.

Q: Are the Microchip 24LC16B parts compatible with the FT24C16A-USR-T?

A: The 24LC16B series provides I2C EEPROM functionality with identical memory organization (16Kbit, 2K x 8). However, the minimum supply voltage is 2.5V, which excludes applications operating below this threshold. Clock frequency and access time are identical to the 24AA16 series (400 kHz, 900 ns).

Q: What packaging options are available for substitute parts?

A: Parametric equivalents (FT24C16A-ESG-T, FT24C16A-ESR-T) are supplied in Tape & Reel format. Microchip 24AA16 series parts are available in Tube, Tape & Reel, and Cut Tape & Digi-Reel formats. Microchip 24LC16B series parts are available in Tube and Tape & Reel formats. Selection depends on assembly process requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance status, consistent with the original FT24C16A-USR-T specification.

Q: Which substitute part offers the best inventory availability?

A: 24AA16T-I/SN provides the highest inventory level with 13,300 units in stock. FT24C16A-ESR-T offers 5,180 units. For immediate availability of parametric equivalents, FT24C16A-ESR-T is the recommended choice.

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