OPA637BP Equivalent & Substitute Parts

Part Overview

The OPA637BP is a general-purpose operational amplifier manufactured by Texas Instruments, housed in an 8-DIP through-hole package. This device is classified as obsolete, though 1,466 units remain in current inventory. The OPA637BP operates within a supply voltage range of 9V to 36V and is designed for applications requiring low input bias current (1 pA) and moderate slew rate performance (135V/µs). Due to its obsolete status, identification of equivalent and substitute components is necessary for design continuity, long-term availability assurance, and system reliability in new production runs or redesigns.

Substiute Parts

OPA637BP

Texas InstrumentsIn Stock: 1488OPA637BP Datasheet

Current PartRFQ

OPA828IDR

Texas InstrumentsIn Stock: 16747OPA828IDR Datasheet

MFR RecommendedRFQ

LT1468CN8#PBF

Analog Devices Inc.In Stock: 1839LT1468CN8#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OPA637BP is determined by the following critical parameters:

Primary Substitution Criteria:

• Amplifier Type classification (General Purpose or J-FET)
• Number of Circuits (single circuit requirement)
• Input Bias Current specification (1 pA maximum)
• Supply voltage compatibility (minimum 9V, maximum 36V overlap)
• Package compatibility (8-DIP through-hole preferred for direct replacement)
• RoHS3 compliance and REACH unaffected status

Substitute Categories:

1. Direct Package Replacement (8-DIP Through-Hole): LT1468CN8#PBF maintains identical package form factor and mounting type, enabling direct PCB substitution without layout modification.

2. Functional Equivalent (Alternative Package): OPA828IDR provides equivalent circuit functionality with J-FET amplifier architecture but requires surface-mount PCB redesign due to 8-SOIC packaging.

Both substitute parts meet the core electrical requirements of single-circuit operation, low input bias current (1 pA), and compliance certifications. Supply voltage ranges overlap within the 9V to 36V specification window for the OPA637BP.

Parameter Comparison

Engineering Selection Recommendations

LT1468CN8#PBF Selection Criteria:

The LT1468CN8#PBF is the preferred direct replacement for the OPA637BP in applications where PCB layout preservation is required. Both devices share identical 8-DIP through-hole packaging, enabling socket-compatible substitution. The LT1468CN8#PBF maintains ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the OPA637BP's environmental specifications. The substitute operates within the overlapping supply voltage range (9V to 30V), though the maximum supply voltage is reduced from 36V to 30V. The LT1468CN8#PBF exhibits lower slew rate (22V/µs versus 135V/µs) and higher input bias current (10 nA versus 1 pA), which may impact performance in high-speed or ultra-low-bias-current applications. Operating temperature range is narrower (0°C to 70°C versus -25°C to 85°C). The LT1468CN8#PBF is currently in active production with 1,810 units in inventory.

OPA828IDR Selection Criteria:

The OPA828IDR is suitable for applications where package form factor change is acceptable and enhanced performance specifications are beneficial. This J-FET amplifier provides superior slew rate (150V/µs versus 135V/µs) and extended operating temperature range (-40°C to 125°C). The OPA828IDR maintains the 1 pA input bias current specification and ROHS3 compliance. However, the 8-SOIC surface-mount package requires PCB redesign and assembly process modification. The gain bandwidth product is reduced (45 MHz versus 80 MHz), and output current per channel is lower (30 mA versus 45 mA). Moisture sensitivity level is MSL 2 (1 Year), requiring controlled storage conditions. The OPA828IDR is in active production with 16,718 units in inventory.

Compliance Verification:

All three devices (OPA637BP, LT1468CN8#PBF, OPA828IDR) maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for electronic component substitution in regulated industries.

Frequently Asked Questions (FAQ)

Q: Can the LT1468CN8#PBF be used as a direct socket replacement for the OPA637BP?

A: Yes. Both devices are housed in 8-DIP through-hole packages with identical 0.300" (7.62mm) spacing. The LT1468CN8#PBF can be inserted into existing OPA637BP sockets without PCB modification. However, verify that the reduced maximum supply voltage (30V versus 36V) and narrower operating temperature range (0°C to 70°C versus -25°C to 85°C) are compatible with your application requirements.

Q: What are the key performance differences between the OPA637BP and OPA828IDR?

A: The OPA828IDR offers higher slew rate (150V/µs versus 135V/µs) and wider operating temperature range (-40°C to 125°C versus -25°C to 85°C). However, it provides lower gain bandwidth product (45 MHz versus 80 MHz) and reduced output current per channel (30 mA versus 45 mA). The OPA828IDR uses J-FET amplifier architecture versus the general-purpose design of the OPA637BP. Package form factor differs (8-SOIC surface-mount versus 8-DIP through-hole), requiring PCB redesign.

Q: Is the OPA828IDR suitable for high-frequency applications?

A: The OPA828IDR has a lower gain bandwidth product (45 MHz) compared to the OPA637BP (80 MHz) and LT1468CN8#PBF (90 MHz). For applications requiring bandwidth above 45 MHz, the OPA828IDR is not recommended. The LT1468CN8#PBF or OPA637BP are more appropriate for higher-frequency signal processing.

Q: What is the impact of the LT1468CN8#PBF's higher input bias current on circuit performance?

A: The LT1468CN8#PBF specifies 10 nanoamperes input bias current, compared to 1 picoampere for the OPA637BP. This 10,000-fold increase may introduce measurable offset voltage in high-impedance input circuits or precision instrumentation applications. Applications with input impedances below 1 megohm typically experience negligible impact. Verify input bias current specifications against your circuit's input impedance and offset voltage tolerance.

Q: Are all three devices RoHS3 compliant?

A: Yes. The OPA637BP, LT1468CN8#PBF, and OPA828IDR all maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for electronic component use in regulated markets.

Q: What is the moisture sensitivity difference between the substitute parts?

A: The OPA637BP and LT1468CN8#PBF both specify MSL 1 (Unlimited), requiring no special moisture control during storage or handling. The OPA828IDR specifies MSL 2 (1 Year), requiring controlled storage conditions and moisture barrier packaging. If the OPA828IDR is selected, implement appropriate moisture management protocols during inventory storage and assembly operations.

Q: Can the OPA828IDR be used in applications requiring -25°C operation?

A: No. The OPA828IDR operating temperature range is -40°C to 125°C, which does not include -25°C. The OPA637BP and LT1468CN8#PBF both support -25°C minimum operating temperature. For applications requiring -25°C operation, select the LT1468CN8#PBF as the substitute.

Q: What supply voltage range is compatible with all three devices?

A: The overlapping supply voltage range for all three devices is 9V to 30V. The OPA637BP supports up to 36V, and the OPA828IDR supports up to 36V, but the LT1468CN8#PBF maximum is 30V. For applications requiring supply voltages above 30V, the LT1468CN8#PBF is not suitable.