TLC1541IFN Equivalent & Substitute Parts

Part Overview

The TLC1541IFN is a 10-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, featuring 11 single-ended inputs with a SAR (Successive Approximation Register) architecture and SPI data interface. The device operates at a 32 kHz sampling rate and is housed in a 20-PLCC (9x9) surface mount package. This part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Resolution (Bits)	10
Number of Inputs	11
Input Type	Single Ended
Sampling Rate	32 kHz
Data Interface	SPI
Architecture	SAR
Analog Supply Voltage	5V
Digital Supply Voltage	5V
Operating Temperature Range	-40°C to 85°C
Package Type	20-PLCC (9x9)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the TLC1541IFN is determined by the following core electrical and mechanical parameters:

Resolution: 10-bit ADC capability
Input Configuration: Single-ended input architecture
Data Interface: SPI protocol compatibility
Converter Architecture: SAR-based conversion
Supply Voltage Compatibility: Operation within or overlapping the 5V supply domain
Sampling Rate: Minimum performance at or above 32 kHz
Package Compatibility: Physical and electrical compatibility with 20-pin surface mount footprints, or functional equivalence allowing PCB redesign

The ADS7956SRHBT meets these substitution criteria through equivalent resolution, input type, data interface, and SAR architecture, while offering enhanced performance characteristics and active product status.

Parameter Comparison

Parameter	TLC1541IFN	ADS7956SRHBT	Compatibility Notes
Resolution	10-bit	10-bit	Equivalent
Number of Inputs	11	12	Substitute provides additional input channel
Input Type	Single Ended	Single Ended	Equivalent
Sampling Rate	32 kHz	1 MHz	Substitute exceeds minimum requirement
Data Interface	SPI	SPI	Equivalent
Architecture	SAR	SAR	Equivalent
Analog Supply Voltage	5V	2.7V to 5.25V	Substitute supports wider range, includes 5V operation
Digital Supply Voltage	5V	1.7V to 5.25V	Substitute supports wider range, includes 5V operation
Operating Temperature Range	-40°C to 85°C	-40°C to 125°C	Substitute supports extended upper temperature limit
Package Type	20-PLCC (9x9)	32-VQFN (5x5)	Different package; PCB redesign required
Product Status	Obsolete	Active	Substitute is actively manufactured
RoHS Compliance	ROHS3 Compliant	ROHS3 Compliant	Equivalent

Engineering Selection Recommendations

The ADS7956SRHBT is the manufacturer-recommended substitute for the obsolete TLC1541IFN. Both devices are ROHS3 compliant and REACH unaffected, meeting equivalent regulatory requirements.

The primary design consideration is package transition: the TLC1541IFN uses a 20-PLCC (9x9) package, while the ADS7956SRHBT uses a 32-VQFN (5x5) package. This substitution requires PCB layout redesign and footprint modification.

Electrical compatibility is maintained across all critical parameters. The ADS7956SRHBT operates within the 5V supply domain of the original design while offering extended supply voltage ranges (2.7V to 5.25V analog, 1.7V to 5.25V digital), providing design flexibility for future applications. The substitute device provides one additional input channel (12 versus 11) and significantly higher sampling rate capability (1 MHz versus 32 kHz), both of which are backward-compatible enhancements.

The ADS7956SRHBT is actively manufactured and available in production quantities, eliminating obsolescence risk associated with the TLC1541IFN.

Frequently Asked Questions (FAQ)

Q: Can the ADS7956SRHBT be used as a direct pin-for-pin replacement for the TLC1541IFN?

A: No. The TLC1541IFN uses a 20-PLCC package while the ADS7956SRHBT uses a 32-VQFN package. Pin counts and physical footprints differ, requiring PCB redesign and new layout implementation.

Q: Are the SPI interfaces compatible between these devices?

A: Both devices use SPI data interface protocol. However, pin assignments differ due to package differences. Firmware and hardware interface design must be validated for the new package configuration.

Q: What is the impact of the increased sampling rate in the ADS7956SRHBT?

A: The ADS7956SRHBT operates at 1 MHz sampling rate compared to the TLC1541IFN at 32 kHz. This higher performance is backward-compatible; systems designed for 32 kHz operation will function correctly with the faster device. No performance degradation occurs.

Q: Does the additional input channel on the ADS7956SRHBT affect compatibility?

A: The ADS7956SRHBT provides 12 input channels versus 11 on the TLC1541IFN. This additional channel is a functional enhancement and does not impact existing designs. Unused channels can remain unconnected.

Q: Are supply voltage requirements compatible?

A: The TLC1541IFN requires fixed 5V supplies. The ADS7956SRHBT accepts 2.7V to 5.25V analog supply and 1.7V to 5.25V digital supply. Designs using 5V supplies are fully compatible. The wider voltage range of the substitute provides additional design flexibility.

Q: What is the operating temperature capability difference?

A: The TLC1541IFN operates from -40°C to 85°C. The ADS7956SRHBT extends the upper limit to 125°C, supporting applications requiring higher temperature operation.

Q: Is this substitution recommended by the manufacturer?

A: Yes. The ADS7956SRHBT is listed as the manufacturer-recommended substitute for the TLC1541IFN.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message