OPA656N/250 Equivalent & Substitute Parts

Part Overview

The OPA656N/250 is a voltage feedback operational amplifier manufactured by Texas Instruments, housed in a SOT-23-5 surface mount package. This device functions as a single-circuit operational amplifier with a slew rate of 295 V/µs and gain bandwidth product of 230 MHz, designed for applications requiring moderate-speed signal conditioning and amplification.

The OPA656N/250 carries a Last Time Buy product status, indicating that Texas Instruments has discontinued this part number. Identifying equivalent and substitute components is necessary to maintain design continuity, ensure supply chain reliability, and support long-term production requirements.

Substiute Parts

OPA656N/250

Texas InstrumentsIn Stock: 19140OPA656N/250 Datasheet

Current PartRFQ

LMH6609MF/NOPB

Texas InstrumentsIn Stock: 18913LMH6609MF/NOPB Datasheet

MFR RecommendedRFQ

LMH6609MFX/NOPB

Texas InstrumentsIn Stock: 15152LMH6609MFX/NOPB Datasheet

MFR RecommendedRFQ

OPA656NB/250

Texas InstrumentsIn Stock: 15830OPA656NB/250 Datasheet

Parametric EquivalentRFQ

MAX4104EUK+T

Analog Devices Inc./Maxim IntegratedIn Stock: 3791MAX4104EUK+T Datasheet

MFR RecommendedRFQ

MAX4305EUK+T

Analog Devices Inc./Maxim IntegratedIn Stock: 3817MAX4305EUK+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPA656N/250 is determined by the following critical parameters:

Functional Compatibility Criteria:

• Amplifier Type: Voltage Feedback (required)
• Number of Circuits: 1 (required)
• Package / Case: SC-74A, SOT-753 (required for PCB compatibility)
• Mounting Type: Surface Mount (required)
• Operating Temperature Range: -40°C to 85°C (required)

Performance Compatibility Criteria:

• Slew Rate: 295 V/µs (minimum acceptable)
• Gain Bandwidth Product: 230 MHz (minimum acceptable)
• -3dB Bandwidth: 500 MHz (minimum acceptable)
• Current - Supply: 14 mA (nominal reference)
• Current - Output / Channel: 70 mA (minimum acceptable)
• Voltage - Supply Span: 8 V to 12 V (required operating range)

Substitute parts are classified into two categories:

Parametric Equivalent: OPA656NB/250 maintains identical electrical performance specifications and is sourced from the same manufacturer base product line.

Manufacturer Recommended Substitutes: LMH6609MF/NOPB and LMH6609MFX/NOPB offer enhanced performance characteristics (higher slew rate, greater bandwidth) while maintaining functional compatibility and package equivalence.

Cross-Manufacturer Alternatives: MAX4104EUK+T and MAX4305EUK+T provide functional equivalence from Analog Devices Inc./Maxim Integrated with comparable electrical performance within acceptable operating parameters.

Parameter Comparison

Engineering Selection Recommendations

OPA656NB/250 (Parametric Equivalent)

The OPA656NB/250 is the direct parametric equivalent to the OPA656N/250. Both devices share identical electrical performance specifications, including slew rate, gain bandwidth product, and bandwidth characteristics. The OPA656NB/250 carries Active product status, ensuring continued availability and supply chain support. This part maintains the same packaging, mounting type, and compliance certifications (ROHS3, REACH Unaffected). The primary distinction is improved input bias current (1 pA versus 2 pA). Selection of OPA656NB/250 is appropriate for designs requiring exact performance matching with the original OPA656N/250 specification.

LMH6609MF/NOPB and LMH6609MFX/NOPB (Manufacturer Recommended Substitutes)

Both LMH6609 variants are Texas Instruments manufacturer-recommended substitutes with Active product status. These devices deliver enhanced performance: slew rate of 1400 V/µs (4.7× improvement) and -3dB bandwidth of 900 MHz (1.8× improvement). Supply current is reduced to 7 mA (50% lower than OPA656N/250). Both variants are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), providing superior handling characteristics compared to the original part's MSL 2 (1 Year) rating. The LMH6609MFX/NOPB variant is functionally identical to LMH6609MF/NOPB; selection between them depends on packaging preference (both supplied in Tape & Reel format). These substitutes are suitable for applications where improved dynamic performance and reduced power consumption provide design benefits.

MAX4104EUK+T (Cross-Manufacturer Alternative)

The MAX4104EUK+T from Analog Devices Inc./Maxim Integrated provides functional equivalence with Active product status. This device offers intermediate performance characteristics: slew rate of 400 V/µs and -3dB bandwidth of 625 MHz. Supply current is 20 mA (higher than OPA656N/250). Input bias current is 32 µA and input offset voltage is 1 mV, representing reduced precision compared to the original part. The MAX4104EUK+T is ROHS3 compliant with MSL 1 (Unlimited). This substitute is appropriate for applications where cross-manufacturer sourcing provides supply chain redundancy and where the specified performance parameters are acceptable.

MAX4305EUK+T (Cross-Manufacturer Alternative)

The MAX4305EUK+T from Analog Devices Inc./Maxim Integrated provides functional equivalence with Active product status and enhanced slew rate of 1400 V/µs. However, -3dB bandwidth is 340 MHz (lower than OPA656N/250's 500 MHz). Supply current is 20 mA. Input bias current is 32 µA and input offset voltage is 1 mV. The MAX4305EUK+T is ROHS3 compliant with MSL 1 (Unlimited). This substitute is appropriate for applications where high slew rate is prioritized and reduced bandwidth is acceptable.

Frequently Asked Questions (FAQ)

Q: Can I directly replace OPA656N/250 with OPA656NB/250 without circuit modifications?

A: Yes. The OPA656NB/250 is a parametric equivalent with identical electrical performance specifications. No circuit modifications are required. The only difference is improved input bias current (1 pA versus 2 pA), which provides enhanced precision. PCB layout and component values remain unchanged.

Q: What are the key differences between LMH6609MF/NOPB and LMH6609MFX/NOPB?

A: Both variants are functionally identical with the same electrical performance. The difference is in packaging designation. Both are supplied in Tape & Reel format. Selection depends on your procurement and assembly process requirements.

Q: Are the LMH6609 variants drop-in replacements for OPA656N/250?

A: The LMH6609 variants are pin-compatible and package-compatible (SOT-23-5). However, they are not drop-in replacements in the strict sense because they offer enhanced performance characteristics (higher slew rate and bandwidth). Circuit operation will differ. Designs optimized for OPA656N/250 performance will function with LMH6609 variants, but the improved performance may require circuit re-evaluation to ensure stability and prevent oscillation in feedback networks.

Q: Why do MAX4104EUK+T and MAX4305EUK+T have higher input bias currents?

A: Input bias current is determined by the internal transistor architecture and manufacturing process. The MAX4104 and MAX4305 devices use different semiconductor processes than the OPA656 and LMH6609 families, resulting in higher input bias current specifications (32 µA versus 2 pA or 1 pA). This difference is acceptable in applications where input impedance is not critical.

Q: Can I use MAX4305EUK+T if my application requires 500 MHz bandwidth?

A: No. The MAX4305EUK+T has -3dB bandwidth of 340 MHz, which is below the OPA656N/250 specification of 500 MHz. If your application requires 500 MHz or greater bandwidth, select OPA656NB/250, LMH6609MF/NOPB, LMH6609MFX/NOPB, or MAX4104EUK+T.

Q: What is the significance of Moisture Sensitivity Level (MSL) differences?

A: MSL indicates the maximum time a component can be stored in ambient conditions before requiring baking prior to reflow soldering. OPA656N/250 has MSL 2 (1 Year), requiring baking if stored longer than one year. LMH6609 and MAX4104/MAX4305 variants have MSL 1 (Unlimited), requiring no time-based baking. For long-term inventory management, MSL 1 components provide operational flexibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (OPA656NB/250, LMH6609MF/NOPB, LMH6609MFX/NOPB, MAX4104EUK+T, MAX4305EUK+T) are ROHS3 compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

Q: Which substitute offers the best overall performance improvement?

A: LMH6609MF/NOPB and LMH6609MFX/NOPB provide the most significant performance improvements: 4.7× higher slew rate (1400 V/µs), 1.8× greater bandwidth (900 MHz), and 50% lower supply current (7 mA). These variants are manufacturer-recommended substitutes from Texas Instruments with Active product status.

Q: Can I use these substitutes in high-frequency applications above 500 MHz?

A: The OPA656N/250 has -3dB bandwidth of 500 MHz. LMH6609 variants extend this to 900 MHz, and MAX4104EUK+T reaches 625 MHz. MAX4305EUK+T is limited to 340 MHz. For applications requiring bandwidth above 500 MHz, LMH6609 variants are the appropriate choice among the listed substitutes.