EL2126CSZ-T7 Equivalent & Substitute Parts

Part Overview

The EL2126CSZ-T7 is a voltage feedback amplifier manufactured by Renesas Electronics Corporation, housed in an 8-SOIC surface mount package. This linear amplifier integrates one circuit with a slew rate of 150V/µs and -3dB bandwidth of 135 MHz, designed for applications requiring moderate-speed signal amplification with low input offset voltage and bias current characteristics.

The EL2126CSZ-T7 carries an Obsolete product status. Locating equivalent and substitute parts is necessary to support ongoing system maintenance, design revisions, and production continuity where original components are no longer available through standard distribution channels.

Substiute Parts

EL2126CSZ-T7

Renesas Electronics CorporationIn Stock: 1090EL2126CSZ-T7 Datasheet

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LM7121IM/NOPB

Texas InstrumentsIn Stock: 1174LM7121IM/NOPB Datasheet

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LM7121IMX/NOPB

Texas InstrumentsIn Stock: 2020LM7121IMX/NOPB Datasheet

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THS4031CD

Texas InstrumentsIn Stock: 1872THS4031CD Datasheet

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THS4031CDR

Texas InstrumentsIn Stock: 1669THS4031CDR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the EL2126CSZ-T7 is determined by strict alignment of electrical and mechanical parameters within the voltage feedback amplifier category. The following criteria establish valid substitution relationships:

Primary Substitution Criteria:

• Amplifier Type: Voltage Feedback (required match)
• Number of Circuits: 1 (required match)
• Package / Case: 8-SOIC surface mount (required match)
• Mounting Type: Surface Mount (required match)

Secondary Electrical Parameters for Compatibility Assessment:

• Slew Rate: 150V/µs (baseline; higher values acceptable)
• -3dB Bandwidth: 135 MHz (baseline; higher values acceptable)
• Current - Input Bias: 7 µA (baseline; lower values acceptable)
• Voltage - Input Offset: 500 µV (baseline; lower values acceptable)
• Current - Supply: 5 mA (baseline; comparable or lower values acceptable)
• Current - Output / Channel: 220 mA (baseline; comparable or higher values acceptable)
• Voltage - Supply Span: 5V to 30V (baseline; wider ranges acceptable)
• Operating Temperature: -40°C to 85°C (baseline; wider ranges acceptable)

Compliance Requirements:

• RoHS3 Compliance (required match)
• REACH Unaffected status (required match)

The substitute parts listed below satisfy these criteria and are presented in order of electrical performance alignment and product status.

Parameter Comparison

Engineering Selection Recommendations

LM7121IM/NOPB and LM7121IMX/NOPB (Texas Instruments)

These parts carry Active product status, providing the longest availability window and supply chain stability. Both devices exceed the EL2126CSZ-T7 in slew rate (1300V/µs versus 150V/µs) and bandwidth (235 MHz versus 135 MHz), delivering enhanced performance margins. The LM7121 series maintains full compatibility with the -40°C to 85°C operating temperature range and supports the required 5V to 30V supply span. Input bias current is lower (5.2 µA versus 7 µA), and input offset voltage is slightly higher (900 µV versus 500 µV). Output current capability is reduced (71 mA versus 220 mA), requiring circuit-level verification for high-current applications. Both variants are ROHS3 compliant with MSL 1 rating, indicating superior moisture handling compared to the original part. The LM7121IMX/NOPB is supplied in Cut Tape and Digi-Reel packaging with 2000 units in stock, while the LM7121IM/NOPB is supplied in Tube packaging with 1156 units in stock.

THS4031CD (Texas Instruments)

This part carries Last Time Buy status, indicating limited future availability. The THS4031CD operates at a lower slew rate (100V/µs) and reduced bandwidth (100 MHz) compared to the EL2126CSZ-T7, representing a performance reduction. Input bias current is superior (3 µA versus 7 µA), and input offset voltage matches the original specification (500 µV). The operating temperature range is narrower (0°C to 70°C versus -40°C to 85°C), restricting use in extended temperature applications. Minimum supply voltage requirement is higher (9V versus 5V), limiting low-voltage circuit compatibility. The part is ROHS3 compliant with MSL 1 rating and 1814 units in stock.

THS4031CDR (Texas Instruments)

This part carries Obsolete product status, matching the EL2126CSZ-T7 lifecycle position. Electrical specifications are identical to the THS4031CD. The narrower operating temperature range (0°C to 70°C) and higher minimum supply voltage (9V) present the same constraints. This variant is supplied in Cut Tape and Digi-Reel packaging with 1572 units in stock. Selection of this part should be limited to applications where existing inventory supports long-term requirements.

Recommendation Priority:

For new designs and ongoing production requiring extended component availability, the LM7121IMX/NOPB is the primary selection, offering Active status, superior performance characteristics, and the highest inventory level. The LM7121IM/NOPB provides an equivalent alternative with different packaging. For applications with strict performance matching to the original EL2126CSZ-T7 specification, the THS4031CD offers comparable electrical characteristics within its operational constraints, though Last Time Buy status limits future sourcing. The THS4031CDR should be considered only when existing inventory reserves justify its Obsolete status.

Frequently Asked Questions (FAQ)

Q: Can the LM7121IM/NOPB or LM7121IMX/NOPB be used as direct replacements for the EL2126CSZ-T7?

A: Yes, both LM7121 variants are direct pin-compatible replacements in the 8-SOIC package. The electrical performance exceeds the original specification in slew rate and bandwidth. Circuit verification is required for applications dependent on the original 220 mA output current specification, as the LM7121 series provides 71 mA per channel. All compliance certifications (ROHS3, REACH Unaffected) are maintained.

Q: What is the difference between LM7121IM/NOPB and LM7121IMX/NOPB?

A: Both parts are electrically identical with matching specifications. The primary difference is packaging format: LM7121IM/NOPB is supplied in Tube packaging, while LM7121IMX/NOPB is supplied in Cut Tape and Digi-Reel format. Selection depends on assembly process requirements and inventory management preferences. The LM7121IMX/NOPB has higher stock availability (2000 units versus 1156 units).

Q: Why does the THS4031CD have a narrower operating temperature range than the EL2126CSZ-T7?

A: The THS4031CD is specified for 0°C to 70°C operation, compared to the EL2126CSZ-T7 range of -40°C to 85°C. This reflects different design and characterization parameters between manufacturers. Applications requiring extended temperature operation below 0°C or above 70°C must use the LM7121 series, which maintains the full -40°C to 85°C range.

Q: What does "Last Time Buy" status mean for the THS4031CD?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for this product. Existing inventory is available for purchase, but no new production will occur after the designated cutoff date. This part is suitable for applications with defined production end dates or where existing inventory reserves support long-term requirements. For indefinite production needs, Active status parts such as the LM7121 series are recommended.

Q: Is the higher input offset voltage of the LM7121 series (900 µV versus 500 µV) a concern?

A: The 400 µV difference in input offset voltage is application-dependent. For precision analog circuits requiring offset voltage below 900 µV, circuit-level compensation or the THS4031CD (500 µV specification) may be necessary. For general-purpose amplification applications, the LM7121 series offset voltage is within acceptable tolerances for most designs. Detailed circuit analysis is required for precision applications.

Q: Can the THS4031CD be used in applications requiring 5V minimum supply voltage?

A: No. The THS4031CD requires a minimum supply voltage of 9V, compared to the EL2126CSZ-T7 minimum of 5V. Circuits designed for 5V operation must use the LM7121 series (4.5V minimum), which provides compatibility with low-voltage supply rails. The THS4031CD is restricted to applications with 9V or higher supply voltages.

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

A: The EL2126CSZ-T7 carries MSL 3 (168 Hours), while all substitute parts carry MSL 1 (Unlimited). MSL rating indicates the maximum time a component can be exposed to ambient moisture before soldering. MSL 1 (Unlimited) provides superior moisture tolerance and is preferred for inventory management, extended storage, and supply chain flexibility. All substitute parts offer improved moisture handling characteristics.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The EL2126CSZ-T7 and all listed substitute parts (LM7121IM/NOPB, LM7121IMX/NOPB, THS4031CD, THS4031CDR) are ROHS3 compliant and REACH Unaffected. This ensures regulatory compliance for applications subject to environmental and hazardous substance restrictions.

Q: Which substitute part has the highest current output capability?

A: The EL2126CSZ-T7 provides the highest output current at 220 mA per channel. The THS4031 series provides 90 mA, and the LM7121 series provides 71 mA. For applications requiring output currents exceeding 71 mA, circuit-level buffering or alternative amplifier topologies may be necessary when using the LM7121 series.