OPA657NB/3K Equivalent & Substitute Parts

Part Overview

The OPA657NB/3K is a voltage feedback operational amplifier manufactured by Texas Instruments, housed in a SOT-23-5 surface mount package. This device is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and procurement needs. The OPA657NB/3K delivers high-speed amplification with a 1.6 GHz gain bandwidth product and 700 V/µs slew rate, suitable for applications requiring wideband signal conditioning and high-frequency amplification.

Substiute Parts

OPA657NB/3K

Texas InstrumentsIn Stock: 844OPA657NB/3K Datasheet

Current PartRFQ

OPA657N/250

Texas InstrumentsIn Stock: 16418OPA657N/250 Datasheet

Parametric EquivalentRFQ

OPA657NB/250

Texas InstrumentsIn Stock: 19839OPA657NB/250 Datasheet

Parametric EquivalentRFQ

MAX4104EUK+T

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPA657NB/3K is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

• Amplifier Type: Voltage Feedback
• Number of Circuits: 1
• Package / Case: SC-74A, SOT-753 (SOT-23-5)
• Mounting Type: Surface Mount
• Operating Temperature Range: -40°C to 85°C
• Supply Voltage Range: 8 V to 12 V
• Output Current / Channel: 70 mA

Parametric Equivalence Criteria: Substitute parts must maintain compatibility within the following electrical specifications:

• Slew Rate: 700 V/µs (primary specification)
• Gain Bandwidth Product: 1.6 GHz (primary specification)
• -3dB Bandwidth: 350 MHz (primary specification)
• Current - Supply: 14 mA (nominal operating current)
• Input Bias Current: ≤ 2 pA
• Input Offset Voltage: ≤ 250 µV

Substitute Classification:

Parametric Equivalents (OPA657N/250, OPA657NB/250): These parts share identical electrical performance specifications with the main part, including slew rate, gain bandwidth product, and bandwidth characteristics. Both are active products from Texas Instruments with enhanced inventory availability. The primary difference is input offset voltage specification (250 µV vs. 100 µV for the main part), which remains within acceptable tolerance for most applications.

Manufacturer Recommended Substitute (MAX4104EUK+T): This Analog Devices Inc./Maxim Integrated device provides functional substitution with different electrical performance characteristics. The MAX4104EUK+T operates within the same supply voltage range and package format but exhibits reduced slew rate (400 V/µs) and increased input bias current (32 µA). This device is suitable for applications where the specified performance envelope of the OPA657NB/3K is not a strict requirement.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalence):

The OPA657N/250 and OPA657NB/250 are active Texas Instruments products suitable for direct substitution of the obsolete OPA657NB/3K. Both devices maintain the critical electrical performance specifications: 700 V/µs slew rate, 1.6 GHz gain bandwidth product, and 350 MHz -3dB bandwidth. The OPA657NB/250 is preferred when input offset voltage specification of 100 µV is required; the OPA657N/250 is acceptable when 250 µV input offset voltage is within design tolerance. Both parts are ROHS3 compliant and operate across the full -40°C to 85°C temperature range. Inventory availability is significantly higher for both active equivalents compared to the obsolete main part.

For Functional Substitution (Performance Trade-offs):

The MAX4104EUK+T from Analog Devices Inc./Maxim Integrated provides functional substitution when performance envelope relaxation is acceptable. This device operates within the same supply voltage range (7 V to 11 V, overlapping with the 8 V to 12 V requirement) and identical package format. However, the MAX4104EUK+T exhibits reduced slew rate (400 V/µs vs. 700 V/µs) and significantly higher input bias current (32 µA vs. 1 pA). The MAX4104EUK+T offers superior moisture sensitivity rating (MSL 1 vs. MSL 2), providing extended shelf life without baking requirements. This device is suitable for applications where high-speed transient response and ultra-low input bias current are not critical design parameters.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the main part. The MAX4104EUK+T provides enhanced moisture handling characteristics (MSL 1 vs. MSL 2), eliminating the 1-year baking requirement for extended storage.

Frequently Asked Questions (FAQ)

Q: Can OPA657N/250 directly replace OPA657NB/3K in all applications?

A: The OPA657N/250 is a parametric equivalent with identical slew rate (700 V/µs), gain bandwidth product (1.6 GHz), and -3dB bandwidth (350 MHz). The primary difference is input offset voltage specification: 250 µV versus 100 µV. Direct replacement is valid for applications where 250 µV input offset voltage is within design tolerance. For precision applications requiring ≤100 µV offset voltage, the OPA657NB/250 is the preferred substitute.

Q: What are the key differences between OPA657NB/250 and OPA657N/250?

A: Both devices are parametric equivalents with identical electrical performance. The OPA657NB/250 maintains the 100 µV input offset voltage specification of the main part, while OPA657N/250 specifies 250 µV. Both are active Texas Instruments products with ROHS3 compliance and identical package format (SOT-23-5). Selection depends on input offset voltage requirements for the specific application.

Q: Is MAX4104EUK+T a direct replacement for OPA657NB/3K?

A: The MAX4104EUK+T is a functional substitute, not a parametric equivalent. It operates within the same package format and supply voltage range but exhibits different electrical performance: 400 V/µs slew rate (vs. 700 V/µs), 625 MHz -3dB bandwidth (vs. 350 MHz), and 32 µA input bias current (vs. 1 pA). This device is suitable for applications where the OPA657NB/3K performance envelope is not a strict requirement. Applications requiring high-speed transient response or ultra-low input bias current should use OPA657N/250 or OPA657NB/250.

Q: Are all substitute parts compatible with the SOT-23-5 package footprint?

A: Yes. All substitute parts (OPA657N/250, OPA657NB/250, MAX4104EUK+T) are housed in SC-74A, SOT-753 package format, which is electrically and mechanically equivalent to SOT-23-5. Pin configuration and footprint are identical, enabling direct PCB-level substitution without layout modifications.

Q: What is the impact of supply voltage range differences with MAX4104EUK+T?

A: The OPA657NB/3K specifies 8 V to 12 V supply range, while MAX4104EUK+T specifies 7 V to 11 V. The overlap range is 8 V to 11 V. If the design operates exclusively within 8 V to 11 V, MAX4104EUK+T is compatible. If the design requires operation at 11.5 V or 12 V, MAX4104EUK+T is not suitable; use OPA657N/250 or OPA657NB/250.

Q: Which substitute offers the best long-term availability?

A: OPA657NB/250 and OPA657N/250 are active Texas Instruments products with significantly higher inventory levels (19,758 and 16,358 units respectively) compared to the obsolete OPA657NB/3K (745 units). Both are recommended for new designs and long-term procurement planning. The OPA657NB/250 is preferred when input offset voltage specification of 100 µV is required.

Q: Do all parts meet the same environmental and compliance standards?

A: All substitute parts are ROHS3 compliant and REACH unaffected, consistent with the main part. The MAX4104EUK+T offers superior moisture sensitivity rating (MSL 1 with unlimited shelf life vs. MSL 2 with 1-year baking requirement), providing advantages for extended storage and supply chain flexibility.