OPA317IDR Equivalent & Substitute Parts

Part Overview

The OPA317IDR is a zero-drift operational amplifier manufactured by Texas Instruments, designed for precision analog signal conditioning applications. This single-circuit, rail-to-rail output amplifier operates across a 1.8V to 5.5V supply range and maintains an active product status with full RoHS3 compliance. The device is packaged in an 8-SOIC surface-mount configuration with unlimited moisture sensitivity rating.

Substitute parts are identified to address supply chain continuity, inventory availability, or specific application requirements where electrical and mechanical parameters remain compatible within defined tolerances.

Substiute Parts

OPA317IDR

Texas InstrumentsIn Stock: 3827OPA317IDR Datasheet

Current PartRFQ

NCS21871SN2T1G

onsemiIn Stock: 3788NCS21871SN2T1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute part identification for the OPA317IDR is based on strict electrical and mechanical compatibility criteria. The primary substitute, NCS21871SN2T1G (onsemi), shares the following critical parameters with the main part:

Matching Parameters:

• Single-circuit operational amplifier configuration
• Rail-to-rail output architecture
• Supply voltage range: 1.8V to 5.5V
• Operating temperature range: -40°C to 125°C
• Surface-mount technology
• RoHS3 compliance
• Unlimited moisture sensitivity rating (MSL 1)

Functional Classification: The NCS21871SN2T1G is classified as a general-purpose amplifier within the zero-drift series, indicating functional overlap with precision analog applications. Both devices support identical supply voltage specifications and thermal operating windows, enabling direct substitution in applications where the electrical parameter variations fall within acceptable design tolerances.

Parameter Comparison

Engineering Selection Recommendations

OPA317IDR (Primary Part): The OPA317IDR remains the specified component for applications requiring zero-drift amplifier architecture with Texas Instruments manufacturing and support. Active product status ensures long-term availability and supply chain stability. RoHS3 compliance and unlimited moisture sensitivity rating support deployment in standard industrial and commercial environments.

NCS21871SN2T1G (Substitute Part): The NCS21871SN2T1G qualifies as a substitute where supply constraints or inventory requirements necessitate alternative sourcing. This device carries AEC-Q100 automotive qualification, extending its applicability to automotive-grade applications. The improved input offset voltage (6 µV versus 20 µV) and higher gain bandwidth product (350 kHz versus 300 kHz) represent performance enhancements in precision and frequency response.

Critical Consideration: Package geometry differs between the two devices. The OPA317IDR uses 8-SOIC packaging, while the NCS21871SN2T1G uses SOT-23-5 (5-TSOP) packaging. PCB layout modifications are required for physical substitution. Both devices maintain identical supply voltage specifications (-40°C to 125°C operating range) and RoHS3 compliance, supporting functional interchangeability in circuit design.

Frequently Asked Questions (FAQ)

Q: Can the NCS21871SN2T1G directly replace the OPA317IDR on an existing PCB?

A: Direct PCB replacement is not possible due to package geometry differences. The OPA317IDR uses 8-SOIC packaging while the NCS21871SN2T1G uses SOT-23-5 (5-TSOP) packaging. PCB layout redesign and component footprint modification are required. However, the devices are functionally compatible at the circuit level.

Q: What are the key electrical differences between these two amplifiers?

A: The NCS21871SN2T1G provides superior input offset voltage performance (6 µV versus 20 µV) and higher gain bandwidth product (350 kHz versus 300 kHz). The OPA317IDR offers higher slew rate (0.15 V/µs versus 0.1 V/µs). Both devices operate across identical supply voltage ranges (1.8V to 5.5V) and temperature specifications (-40°C to 125°C).

Q: Are both parts RoHS3 compliant?

A: Yes. Both the OPA317IDR and NCS21871SN2T1G are RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1), supporting deployment in standard manufacturing and storage environments without special handling requirements.

Q: Does the NCS21871SN2T1G have automotive qualification?

A: Yes. The NCS21871SN2T1G carries AEC-Q100 automotive qualification, making it suitable for automotive-grade applications. The OPA317IDR does not list automotive qualification in the provided specifications.

Q: What supply voltage range do both amplifiers support?

A: Both the OPA317IDR and NCS21871SN2T1G operate across a 1.8V to 5.5V supply voltage range, enabling use in single-cell battery applications through standard 5V logic supply systems.

Q: Which amplifier has lower power consumption?

A: The OPA317IDR has lower supply current consumption at 21 µA compared to the NCS21871SN2T1G at 28 µA. For battery-powered or ultra-low-power applications, the OPA317IDR is the preferred choice.

Q: Can these amplifiers be used interchangeably in high-precision measurement circuits?

A: The NCS21871SN2T1G offers superior input offset voltage (6 µV versus 20 µV), making it more suitable for high-precision measurement applications. The OPA317IDR, classified as zero-drift, may provide better long-term offset stability characteristics not detailed in the provided specifications.