TS321ID Equivalent & Substitute Parts Reference

Part Overview

The TS321ID is a general-purpose operational amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as obsolete, though 1,288 units remain available in original stock. The TS321ID serves applications requiring low-power, general-purpose amplification with a supply voltage range of 3V to 30V and operating temperature range of -40°C to 125°C.

Due to its obsolete product status, identifying equivalent and substitute components is essential for design continuity, long-term production planning, and supply chain reliability. Active alternatives with compatible electrical and mechanical specifications are available from both Texas Instruments and Analog Devices Inc.

Substiute Parts

TS321ID

Texas InstrumentsIn Stock: 1329TS321ID Datasheet

Current PartRFQ

TS321IDR

Texas InstrumentsIn Stock: 2089TS321IDR Datasheet

MFR RecommendedRFQ

LT1252CS8#PBF

Analog Devices Inc.In Stock: 1196LT1252CS8#PBF Datasheet

MFR RecommendedRFQ

LT1252CS8#TRPBF

Analog Devices Inc.In Stock: 1089LT1252CS8#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TS321ID is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid equivalence:

Primary Substitution Criteria:

• Package type: 8-SOIC surface mount configuration
• Supply voltage range: Minimum 3V, maximum 30V
• Operating temperature range: -40°C to 125°C
• Number of circuits: Single amplifier per package
• Compliance: ROHS3 and REACH requirements

Identified Substitute Categories:

Category 1: Direct Functional Equivalent (Active Status) The TS321IDR is the active production equivalent manufactured by Texas Instruments. It maintains identical electrical specifications (slew rate 0.4V/µs, gain bandwidth product 800 kHz, input bias current 20 nA, input offset voltage 500 µV) and mechanical packaging. The only difference is packaging format: TS321IDR is supplied in Tape & Reel (TR) configuration versus the original Tube packaging of TS321ID. Both share the same base product number (TS321) and are pin-compatible 8-SOIC devices.

Category 2: Cross-Manufacturer Alternatives (Different Amplifier Class) The LT1252CS8#PBF and LT1252CS8#TRPBF (Analog Devices Inc.) represent a different amplifier topology—current feedback architecture versus the general-purpose design of TS321ID. These devices occupy the same 8-SOIC package footprint and support overlapping supply voltage ranges (4V to 28V single supply, ±2V to ±14V dual supply). However, they exhibit significantly different electrical performance characteristics: -3dB bandwidth of 282 MHz (versus 800 kHz gain bandwidth product), slew rate of 125V/µs (versus 0.4V/µs), and higher supply current of 8.5 mA (versus 600 µA). These substitutes are suitable only for applications where the higher bandwidth and slew rate performance are compatible with circuit design requirements.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Recommended Primary Path):

The TS321IDR is the preferred substitute for the obsolete TS321ID. Both devices are manufactured by Texas Instruments, share identical electrical specifications, and are housed in the same 8-SOIC package footprint. The TS321IDR maintains active product status with higher inventory availability (2,036 units versus 1,288 units). The only distinction is packaging format: TS321IDR is supplied in Tape & Reel configuration, which is standard for high-volume production environments. This substitution requires no circuit redesign and provides full electrical and mechanical compatibility.

For Cross-Manufacturer Substitution (Conditional):

The LT1252CS8#PBF and LT1252CS8#TRPBF from Analog Devices Inc. are suitable substitutes only when circuit design specifications accommodate their significantly different performance characteristics. These current feedback amplifiers operate at substantially higher bandwidth (282 MHz versus 800 kHz) and slew rate (125V/µs versus 0.4V/µs), with correspondingly higher supply current consumption (8.5 mA versus 600 µA). Applications requiring low-power operation or bandwidth-limited designs should not use LT1252 devices as direct replacements. Both LT1252 variants maintain ROHS3 compliance and MSL Level 1 rating, ensuring environmental and reliability standards alignment.

Compliance and Certification Alignment:

All identified substitutes (TS321IDR, LT1252CS8#PBF, LT1252CS8#TRPBF) maintain ROHS3 compliance and REACH unaffected status, matching the original TS321ID specifications. Moisture sensitivity level remains constant at MSL 1 (Unlimited) across all alternatives, eliminating moisture-related handling and storage concerns.

Frequently Asked Questions (FAQ)

Q1: Can TS321IDR be used as a direct drop-in replacement for TS321ID?

A: Yes. The TS321IDR is electrically and mechanically identical to the TS321ID. Both devices feature the same 8-SOIC package footprint, identical pin configuration, and matching electrical specifications (0.4V/µs slew rate, 800 kHz gain bandwidth product, 20 nA input bias current, 500 µV input offset voltage). The only difference is packaging format: TS321IDR is supplied in Tape & Reel configuration instead of Tube. No circuit modifications are required.

Q2: What is the primary difference between TS321ID/TS321IDR and LT1252CS8 devices?

A: The TS321 series are general-purpose operational amplifiers optimized for low-power applications. The LT1252 series are current feedback amplifiers designed for high-speed video and RF applications. Key differences include: LT1252 bandwidth of 282 MHz (versus 800 kHz), slew rate of 125V/µs (versus 0.4V/µs), and supply current of 8.5 mA (versus 600 µA). These are fundamentally different amplifier architectures suitable for different application classes.

Q3: Are packaging differences between Tube and Tape & Reel significant for substitution?

A: Packaging format affects handling, storage, and assembly processes but does not impact electrical performance or circuit compatibility. Tube packaging is typical for lower-volume or manual assembly environments. Tape & Reel packaging is standard for automated pick-and-place assembly in high-volume production. Both formats contain identical components with identical specifications. Selection should be based on manufacturing process requirements.

Q4: Can LT1252CS8#PBF and LT1252CS8#TRPBF be used interchangeably?

A: Yes. Both LT1252 variants are electrically identical and housed in the same 8-SOIC package. The only difference is packaging format: LT1252CS8#PBF is supplied in Tube, while LT1252CS8#TRPBF is supplied in Tape & Reel. Selection depends on assembly process requirements, not electrical performance.

Q5: What supply voltage ranges are supported by each substitute?

A: TS321ID and TS321IDR support 3V to 30V supply range. LT1252CS8 devices support 4V to 28V single supply or ±2V to ±14V dual supply configuration. If your circuit operates below 4V single supply, only TS321 devices are suitable. If your circuit requires dual supply operation, LT1252 devices provide this capability while TS321 devices do not.

Q6: Are all substitutes compliant with RoHS and REACH regulations?

A: Yes. TS321IDR, LT1252CS8#PBF, and LT1252CS8#TRPBF all maintain ROHS3 compliance and REACH unaffected status, matching the original TS321ID. All devices carry MSL Level 1 (Unlimited) moisture sensitivity rating, eliminating moisture-related handling restrictions.

Q7: Which substitute should be selected for new designs?

A: For new designs requiring general-purpose amplification with low power consumption and bandwidth-limited operation, the TS321IDR is the recommended choice. It provides active product status, higher inventory availability, and identical electrical specifications to the obsolete TS321ID. For applications requiring high-speed amplification (video, RF, or wideband signal processing), the LT1252CS8 series offers superior bandwidth and slew rate performance, though with higher power consumption.