TLC251CPSR Equivalent & Substitute Parts

Part Overview

The TLC251CPSR is a general-purpose operational amplifier manufactured by Texas Instruments, housed in an 8-SO surface mount package. This device is classified as obsolete, indicating discontinued production and limited availability through standard distribution channels. The LinCMOS™ series design provides low input bias current and operates across a 1.4 V to 16 V supply range, suitable for precision analog signal conditioning applications.

Due to its obsolete status, identifying functionally equivalent substitute components is essential for design continuity, production planning, and long-term system reliability. Substitute parts must maintain compatibility with existing PCB layouts, supply voltage requirements, and signal processing specifications.

Substiute Parts

TLC251CPSR

Texas InstrumentsIn Stock: 1042TLC251CPSR Datasheet

Current PartRFQ

TS271CDT

STMicroelectronicsIn Stock: 7884TS271CDT Datasheet

MFR RecommendedRFQ

TS271IDT

STMicroelectronicsIn Stock: 5108TS271IDT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TLC251CPSR are identified based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Amplifier Type: General Purpose (single-circuit configuration)
• Package Type: 8-SOIC surface mount
• Supply Voltage Range: Minimum 1.4 V to maximum 16 V overlap required
• Input Offset Voltage: 1.1 mV (matching specification)
• Mounting: Surface Mount technology
• Compliance: ROHS3 and REACH requirements

Substitution Logic: The TS271CDT and TS271IDT (both STMicroelectronics) are identified as manufacturer-recommended substitutes. Both devices maintain the same functional category (general-purpose single-circuit operational amplifier) and package format (8-SOIC). While these substitutes exhibit different performance characteristics in slew rate and gain bandwidth product, they operate within the required supply voltage envelope and maintain identical input offset voltage specifications. The key distinction between these two substitutes is operating temperature range: TS271CDT supports 0°C to 70°C (matching the original), while TS271IDT extends to -40°C to 125°C for industrial applications.

Parameter Comparison

Engineering Selection Recommendations

TS271CDT Selection Criteria: The TS271CDT is suitable for applications requiring direct temperature range compatibility with the original TLC251CPSR (0°C to 70°C). This substitute maintains active product status from STMicroelectronics, ensuring long-term availability and supply chain stability. The device is ROHS3 compliant and carries unlimited moisture sensitivity rating, matching the original specification. Selection of TS271CDT is appropriate for commercial-grade applications operating within standard industrial temperature bands.

TS271IDT Selection Criteria: The TS271IDT extends the operating temperature range to -40°C to 125°C, providing enhanced capability for applications requiring extended temperature performance. This substitute is recommended for designs targeting industrial or automotive environments where wider temperature operation is specified. Like TS271CDT, it maintains active product status, ROHS3 compliance, and unlimited MSL rating. The extended temperature range does not compromise supply voltage compatibility or input offset voltage specifications.

Package Consideration: Both substitute parts utilize a narrower 8-SOIC package (0.154" width, 3.90mm) compared to the original TLC251CPSR (0.209" width, 5.30mm). PCB layout verification is required to confirm footprint compatibility. The reduced package width may allow for improved board density in new designs but requires confirmation of existing PCB artwork before component substitution.

Supply Voltage Compatibility: The substitute parts specify a minimum supply voltage of 3 V, compared to the original 1.4 V minimum. Applications operating at supply voltages below 3 V are not compatible with these substitutes. Designs operating at 3 V or higher within the 16 V maximum envelope are fully compatible.

Frequently Asked Questions (FAQ)

Q: Can TS271CDT and TS271IDT be used interchangeably in the same application?

A: Both devices are electrically equivalent within their respective operating temperature ranges. TS271CDT operates 0°C to 70°C, while TS271IDT operates -40°C to 125°C. Selection depends on the application's temperature requirements. If the design operates only within 0°C to 70°C, either part is acceptable. For extended temperature operation, TS271IDT is required.

Q: What is the impact of the different package widths (0.209" vs. 0.154")?

A: The substitute parts use a narrower 8-SOIC package. Existing PCB designs with footprints for the original 0.209" width package may not accommodate the 0.154" width substitute without layout modification. New PCB designs can utilize the narrower package for improved board density. Footprint verification is mandatory before component substitution on existing boards.

Q: Are the substitute parts compatible with supply voltages below 3 V?

A: No. The TS271CDT and TS271IDT specify a minimum supply voltage of 3 V, whereas the original TLC251CPSR operates at 1.4 V minimum. Applications requiring operation below 3 V are not compatible with these substitutes. Alternative components must be evaluated for low-voltage applications.

Q: How do the performance differences in slew rate and gain bandwidth product affect circuit operation?

A: The original TLC251CPSR provides 5.3 V/µs slew rate and 2.2 MHz gain bandwidth product. The substitutes provide 0.04 V/µs slew rate and 100 kHz gain bandwidth product. These differences indicate the substitutes are optimized for lower-speed, lower-power applications. High-frequency signal processing circuits or applications requiring fast transient response may not be suitable for these substitutes. Circuit simulation or prototype testing is necessary to confirm performance adequacy for specific applications.

Q: Do the substitute parts maintain the same compliance certifications?

A: Yes. Both TS271CDT and TS271IDT are ROHS3 compliant, REACH unaffected, and carry unlimited moisture sensitivity rating (MSL 1), matching the original TLC251CPSR specifications. Regulatory compliance is maintained across all three devices.

Q: What is the inventory status of these substitute parts?

A: TS271CDT has 7,801 pieces in stock, and TS271IDT has 5,012 pieces in stock, both listed as active products. The original TLC251CPSR, though obsolete, has 932 pieces available. Active product status for the substitutes ensures ongoing availability and supply chain continuity.