EL2125CS-T13 Equivalent & Substitute Parts

Part Overview

The EL2125CS-T13 is a voltage feedback amplifier manufactured by Renesas Electronics Corporation, housed in an 8-SOIC surface mount package. This linear amplifier integrated circuit features a single amplification circuit with a slew rate of 185V/µs and -3dB bandwidth of 220 MHz. The device operates across a supply voltage range of 5V to 30V and is rated for temperatures from -45°C to 85°C.

The EL2125CS-T13 carries an obsolete product status. Locating equivalent and substitute parts is necessary to support ongoing system maintenance, design updates, and production continuity where this component is specified in existing applications.

Key Parameters

Parameter	Value	Unit
Amplifier Type	Voltage Feedback	—
Number of Circuits	1	—
Slew Rate	185	V/µs
-3dB Bandwidth	220	MHz
Current - Input Bias	22	µA
Voltage - Input Offset	600	µV
Current - Supply	10.8	mA
Current - Output / Channel	250	mA
Voltage - Supply Span (Min)	5	V
Voltage - Supply Span (Max)	30	V
Operating Temperature Range	-45 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the EL2125CS-T13 is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Amplifier type must be voltage feedback
Single circuit configuration required
Package and case must be 8-SOIC (0.154", 3.90mm Width)
Supply voltage range must encompass or exceed the original 5V to 30V span
Operating temperature range must support the application requirements
Slew rate, bandwidth, input bias current, input offset voltage, supply current, and output current must be evaluated against circuit design margins

Mechanical Compatibility Criteria:

Surface mount mounting type
8-SOIC supplier device package
Identical physical footprint (0.154", 3.90mm Width)

The substitute parts identified below meet these core compatibility requirements while offering variations in performance characteristics and product status.

Parameter Comparison

Parameter	EL2125CS-T13	LM7121IM/NOPB	LM7121IMX/NOPB	THS4031CD	THS4031CDR	THS4031ID	THS4031IDR
Manufacturer	Renesas	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Amplifier Type	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback
Number of Circuits	1	1	1	1	1	1	1
Slew Rate (V/µs)	185	1300	1300	100	100	100	100
-3dB Bandwidth (MHz)	220	235	235	100	100	100	100
Current - Input Bias (µA)	22	5.2	5.2	3	3	3	3
Voltage - Input Offset (µV)	600	900	900	500	500	500	500
Current - Supply (mA)	10.8	5.3	5.3	8.5	8.5	8.5	8.5
Current - Output / Channel (mA)	250	71	71	90	90	90	90
Voltage - Supply Span Min (V)	5	4.5	4.5	9	9	9	9
Voltage - Supply Span Max (V)	30	33	33	32	32	32	32
Operating Temperature (°C)	-45 to 85	-40 to 85	-40 to 85	0 to 70	0 to 70	-40 to 85	-40 to 85
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Last Time Buy	Obsolete	Last Time Buy	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

LM7121IM/NOPB and LM7121IMX/NOPB (Texas Instruments)

These parts offer the highest performance characteristics with slew rate of 1300V/µs and -3dB bandwidth of 235 MHz. Both devices are ROHS3 compliant and carry active product status, ensuring long-term availability. The LM7121IMX/NOPB variant is available in Cut Tape and Digi-Reel packaging with 2000 units in stock. The LM7121IM/NOPB is supplied in Tube packaging with 1156 units in stock. Operating temperature range is -40°C to 85°C. Supply voltage range of 4.5V to 33V accommodates the original 5V to 30V requirement. Input bias current of 5.2µA and input offset voltage of 900µV represent improvements over the original device. Output current per channel is 71mA, which is lower than the original 250mA specification and must be evaluated against circuit requirements.

THS4031IDR (Texas Instruments)

This part carries active product status with 4390 units in stock, providing the strongest long-term availability. ROHS3 compliant. Operating temperature range of -40°C to 85°C matches the original specification. Supply voltage range of 9V to 32V requires verification that the 9V minimum does not conflict with circuit design. Slew rate of 100V/µs and -3dB bandwidth of 100 MHz represent reduced performance compared to the original 185V/µs and 220 MHz. Input bias current of 3µA and input offset voltage of 500µV are superior to the original specifications. Output current per channel is 90mA, significantly lower than the original 250mA.

THS4031ID (Texas Instruments)

Last Time Buy status with 1349 units in stock. ROHS3 compliant. Operating temperature range of -40°C to 85°C matches the original specification. Electrical characteristics identical to THS4031IDR. Supply voltage range of 9V to 32V requires the same verification as THS4031IDR.

THS4031CD and THS4031CDR (Texas Instruments)

THS4031CD carries Last Time Buy status with 1814 units in stock. THS4031CDR is obsolete with 1572 units in stock. Both are ROHS3 compliant. Operating temperature range is limited to 0°C to 70°C, which does not support the original -45°C to 85°C specification. Supply voltage range of 9V to 32V requires verification. Electrical characteristics are identical to THS4031IDR and THS4031ID. These parts are suitable only for applications with restricted temperature requirements.

Frequently Asked Questions (FAQ)

Q: Can the LM7121IM/NOPB directly replace the EL2125CS-T13 in all applications?

A: The LM7121IM/NOPB is mechanically and electrically compatible in terms of package, pinout, and supply voltage range. However, the output current per channel is 71mA compared to the original 250mA. Applications requiring the full 250mA output current must be re-evaluated. The higher slew rate and bandwidth of the LM7121IM/NOPB may introduce different circuit behavior in some designs.

Q: What is the key difference between THS4031IDR and THS4031ID?

A: Both parts have identical electrical specifications. THS4031IDR carries active product status, while THS4031ID is Last Time Buy. THS4031IDR is the preferred choice for new designs and long-term production due to its active status and higher inventory availability (4390 units versus 1349 units).

Q: Why do THS4031CD and THS4031CDR have a limited operating temperature range?

A: These variants are specified for 0°C to 70°C operation. The original EL2125CS-T13 operates from -45°C to 85°C. THS4031CD and THS4031CDR are not suitable for applications requiring the full original temperature range.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant. The original EL2125CS-T13 is RoHS non-compliant. Applications subject to RoHS requirements must transition to one of the compliant substitute parts.

Q: What is the significance of the 9V minimum supply voltage in the THS4031 series?

A: The THS4031 series (THS4031CD, THS4031CDR, THS4031ID, THS4031IDR) requires a minimum supply voltage of 9V, compared to the original 5V minimum. Applications operating at supply voltages between 5V and 9V cannot use the THS4031 series and must select the LM7121 series instead.

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

A: THS4031IDR carries active product status with 4390 units in stock, providing the strongest availability guarantee. LM7121IMX/NOPB is also active with 2000 units in stock. Both are suitable for new designs requiring long-term component support.

Q: How do the input bias current specifications compare?

A: The original EL2125CS-T13 has an input bias current of 22µA. All substitute parts offer lower input bias current: LM7121 series at 5.2µA and THS4031 series at 3µA. Lower input bias current generally reduces input offset current errors in circuit designs.

Q: Can the LM7121IMX/NOPB be used interchangeably with LM7121IM/NOPB?

A: Both parts have identical electrical specifications and are functionally interchangeable. The difference is packaging: LM7121IMX/NOPB is supplied in Cut Tape and Digi-Reel format with 2000 units in stock, while LM7121IM/NOPB is supplied in Tube packaging with 1156 units in stock. Selection depends on production equipment compatibility and inventory requirements.

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