TS461CD Equivalent & Substitute Parts

Part Overview

The TS461CD is a general-purpose operational amplifier manufactured by STMicroelectronics, housed in an 8-SOIC surface-mount package. This rail-to-rail amplifier is designed for linear signal processing applications requiring single-circuit amplification with moderate bandwidth and slew rate characteristics. The TS461CD is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain compatibility with the 8-SOIC package footprint and deliver equivalent electrical performance within the specified parameter ranges.

Key Parameters

Parameter	TS461CD Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Slew Rate	4	V/µs
Gain Bandwidth Product	12	MHz
Current - Input Bias	200	nA
Voltage - Input Offset	1	mV
Current - Supply	2	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	10	V
Operating Temperature Range	-20 to 70	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the TS461CD is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface-mount package to ensure PCB footprint compatibility without layout modifications.

Electrical Functionality: Substitute parts must be single-circuit, rail-to-rail operational amplifiers classified as general-purpose or CMOS amplifier types.

Supply Voltage Range: The substitute part's minimum supply voltage must not exceed 2.7 V, and the maximum supply voltage must accommodate the TS461CD's 10 V upper limit. Parts with supply ranges of 2.7 V to 12 V or 3.5 V to 12 V satisfy this requirement.

Operating Temperature: Substitute parts must support operation within or exceed the TS461CD's -20°C to 70°C range. Parts rated to -40°C to 125°C or -40°C to 85°C provide extended temperature coverage.

Regulatory Compliance: All substitute parts must maintain ROHS3 compliance and REACH unaffected status to meet environmental and regulatory requirements equivalent to the original part.

The following substitute parts meet these criteria: OPA725AIDR, OPA743UA, TL971ID, TL971IDR, and TL971QDRQ1.

Parameter Comparison

Parameter	TS461CD	OPA725AIDR	OPA743UA	TL971ID	TL971IDR	TL971QDRQ1
Manufacturer	STMicroelectronics	Texas Instruments	Burr Brown	Texas Instruments	Texas Instruments	Texas Instruments
Amplifier Type	General Purpose	General Purpose	CMOS	General Purpose	General Purpose	General Purpose
Number of Circuits	1	1	1	1	1	1
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	4	30	10	5	5	5
Gain Bandwidth Product (MHz)	12	20	7	12	12	12
Current - Input Bias (nA)	200	0.03	0.001	200	200	200
Voltage - Input Offset (mV)	1	1.2	1.5	1	1	1
Current - Supply (mA)	2	4.3	1.1	2	2	2
Current - Output / Channel (mA)	—	40	20	80	80	80
Voltage - Supply Span (Min)	2.7 V	4 V	3.5 V	2.7 V	2.7 V	2.7 V
Voltage - Supply Span (Max)	10 V	12 V	12 V	12 V	12 V	12 V
Operating Temperature Range	-20 to 70°C	-40 to 125°C	-40 to 85°C	-40 to 125°C	-40 to 125°C	-40 to 125°C
Package / Case	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
Product Status	Obsolete	Active	Active	Last Time Buy	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	2 (1 Year)	—	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

TL971IDR and TL971QDRQ1 (Texas Instruments): These parts provide the closest electrical match to the TS461CD, with identical slew rate (5 V/µs), gain bandwidth product (12 MHz), input bias current (200 nA), and input offset voltage (1 mV). Both maintain the same supply voltage range (2.7 V to 12 V) and current consumption (2 mA). TL971IDR is classified as Active with standard commercial temperature range (-40°C to 125°C). TL971QDRQ1 is qualified to AEC-Q100 automotive standards and is suitable for applications requiring automotive-grade components. Both parts are ROHS3 compliant with unlimited moisture sensitivity. TL971IDR is recommended for general-purpose replacement; TL971QDRQ1 is specified for automotive applications.

TL971ID (Texas Instruments): This part carries Last Time Buy status and offers identical electrical specifications to TL971IDR and TL971QDRQ1. It is suitable for existing inventory management but not recommended for new designs due to its end-of-life classification.

OPA725AIDR (Texas Instruments): This part offers enhanced performance with higher slew rate (30 V/µs) and gain bandwidth product (20 MHz), making it suitable for applications requiring faster signal processing. However, it requires a minimum supply voltage of 4 V, which exceeds the TS461CD's 2.7 V minimum. OPA725AIDR is Active and ROHS3 compliant. Selection of this part requires verification that the application's supply voltage does not fall below 4 V.

OPA743UA (Burr Brown): This CMOS amplifier provides the lowest supply current (1.1 mA) and extremely low input bias current (1 pA), making it suitable for low-power and high-impedance applications. It requires a minimum supply voltage of 3.5 V. OPA743UA is Active but carries a narrower operating temperature range (-40°C to 85°C) compared to the TS461CD. This part is appropriate for applications where power consumption and input bias current are critical parameters.

For new designs requiring direct replacement without circuit modification, TL971IDR is the primary recommendation. For automotive applications, TL971QDRQ1 is specified. For applications with supply voltages below 3.5 V, TL971IDR remains the only viable option among the substitutes.

Frequently Asked Questions (FAQ)

Q: Can the OPA725AIDR be used as a direct replacement for the TS461CD?

A: OPA725AIDR is electrically compatible in terms of package, output type, and circuit count. However, it requires a minimum supply voltage of 4 V, whereas the TS461CD operates from 2.7 V. If the application's supply voltage is 4 V or higher, OPA725AIDR is a valid substitute with improved performance characteristics (higher slew rate and bandwidth). If the application requires operation below 4 V, OPA725AIDR cannot be used.

Q: What is the difference between TL971ID, TL971IDR, and TL971QDRQ1?

A: All three parts share identical electrical specifications. TL971ID is classified as Last Time Buy and should not be selected for new designs. TL971IDR is Active and packaged in Cut Tape & Digi-Reel format. TL971QDRQ1 is Active, packaged in Tape & Reel format, and qualified to AEC-Q100 automotive standards. For new commercial designs, TL971IDR is recommended. For automotive applications, TL971QDRQ1 is specified.

Q: Does the OPA743UA provide better performance than the TS461CD?

A: OPA743UA offers superior input bias current (1 pA versus 200 nA) and lower supply current (1.1 mA versus 2 mA), making it advantageous for low-power and high-impedance signal conditioning. However, it has a lower gain bandwidth product (7 MHz versus 12 MHz) and narrower operating temperature range (-40°C to 85°C versus -20°C to 70°C for the TS461CD). Selection depends on application priorities: if low power and high input impedance are critical, OPA743UA is preferred; if bandwidth and temperature range are critical, TL971IDR is preferred.

Q: Are all substitute parts ROHS3 compliant?

A: TL971ID, TL971IDR, TL971QDRQ1, and OPA725AIDR are explicitly ROHS3 compliant. OPA743UA does not list ROHS status in the provided specifications. For applications requiring ROHS3 compliance certification, TL971IDR, TL971QDRQ1, or OPA725AIDR are specified.

Q: Can I use the OPA743UA in applications requiring operation below 3.5 V?

A: No. OPA743UA requires a minimum supply voltage of 3.5 V and cannot operate below this threshold. For applications requiring operation at 2.7 V, TL971IDR or TL971QDRQ1 must be selected.

Q: What is the moisture sensitivity level difference between the TS461CD and substitute parts?

A: The TS461CD and TL971 series parts (TL971ID, TL971IDR, TL971QDRQ1) have Moisture Sensitivity Level 1 (Unlimited), indicating no moisture-related storage restrictions. OPA725AIDR has Moisture Sensitivity Level 2 (1 Year), requiring controlled storage conditions. For applications with extended storage requirements, TL971 series parts are preferred.

Q: Is the TS461CD still available for purchase?

A: The TS461CD is classified as Obsolete. While 3,994 pieces are reported in stock, new production is not available. For ongoing production requirements, transition to an active substitute part is necessary. TL971IDR (9,894 pieces in stock) or TL971QDRQ1 (2,599 pieces in stock) are recommended for immediate availability.

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