TL081ID Equivalent & Substitute Parts

Part Overview

The TL081ID is a J-FET input operational amplifier manufactured by STMicroelectronics, housed in an 8-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design requirements and production continuity. The TL081ID delivers a 4 MHz gain bandwidth product with a 16 V/µs slew rate, making it suitable for general-purpose amplification applications requiring low input bias current and wide supply voltage range operation.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	1	—
Slew Rate	16	V/µs
Gain Bandwidth Product	4	MHz
Current - Input Bias	20	pA
Voltage - Input Offset	3	mV
Current - Supply	1.4	mA
Current - Output / Channel	40	mA
Voltage - Supply Span (Min)	6	V
Voltage - Supply Span (Max)	36	V
Operating Temperature Range	-40 to 105	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the TL081ID is determined by compatibility across the following critical parameters: amplifier type (J-FET input architecture), package format (8-SOIC surface mount), number of circuits (single channel), and electrical performance envelope (slew rate, gain bandwidth product, input bias current, supply voltage range, and output current capability).

The substitute parts are grouped into two categories based on their electrical and operational characteristics:

Category 1: J-FET Input Amplifiers with Enhanced Performance Parts in this category maintain J-FET input architecture and 8-SOIC packaging while offering comparable or superior electrical performance. These include TL071CDR, TL071ID, and TL071CD, which share the same input bias current specification (20 pA) and similar slew rate characteristics (13–16 V/µs).

Category 2: J-FET and General Purpose Amplifiers with Alternative Performance Trade-offs Parts in this category include the LF356 series (LF356M/NOPB, LF356MX/NOPB) and OPA131 series (OPA131U, OPA131UA, OPA131UA/2K5, OPA131UJ, OPA131UJ/2K5). These devices maintain 8-SOIC packaging and single-circuit configuration but present different electrical characteristics, including variations in slew rate, gain bandwidth product, input bias current, and supply voltage specifications.

Substitution eligibility is determined by matching the 8-SOIC package format, single-circuit topology, and ensuring that the substitute part's electrical specifications remain within acceptable operational bounds for the target application.

Parameter Comparison

Parameter	TL081ID	TL071CDR	TL071ID	TL071CD	LF356M/NOPB	LF356MX/NOPB	OPA131U	OPA131UA	OPA131UA/2K5	OPA131UJ	OPA131UJ/2K5
Amplifier Type	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET	General Purpose	General Purpose	General Purpose	J-FET	J-FET
Number of Circuits	1	1	1	1	1	1	1	1	1	1	1
Slew Rate (V/µs)	16	13	16	16	12	12	10	10	10	10	10
Gain Bandwidth Product (MHz)	4	5.25	4	5.25	5	5	4	4	4	4	4
Current - Input Bias (pA)	20	65	20	20	30	30	5	5	5	5	5
Voltage - Input Offset (mV)	3	3	3	3	3	3	0.2	0.2	0.2	0.2	0.2
Current - Supply (mA)	1.4	1.4	1.4	1.4	5	5	1.5	1.5	1.5	1.5	1.5
Current - Output / Channel (mA)	40	—	40	40	—	—	25	25	25	25	25
Voltage - Supply Span Min (V)	6	10	6	6	30	30	9	9	9	9	9
Voltage - Supply Span Max (V)	36	30	36	36	30	30	36	36	36	36	36
Operating Temperature Range (°C)	-40 to 105	0 to 70	-40 to 105	0 to 70	0 to 70	0 to 70	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	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	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Obsolete	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility)

TL071ID and TL071CDR are the preferred substitutes for the TL081ID. Both maintain J-FET input architecture, 8-SOIC packaging, and identical input bias current specification (20 pA). TL071ID is classified as obsolete but shares the extended operating temperature range (-40°C to 105°C) with the TL081ID and maintains ROHS3 compliance. TL071CDR is an active product with ROHS3 compliance, though it operates within a narrower temperature range (0°C to 70°C) and requires a minimum supply voltage of 10 V compared to the TL081ID's 6 V minimum.

Secondary Substitutes (Conditional Compatibility)

LF356M/NOPB and LF356MX/NOPB are active J-FET input amplifiers with 8-SOIC packaging and ROHS3 compliance. These devices feature a 5 MHz gain bandwidth product, exceeding the TL081ID's 4 MHz specification. However, they require a fixed 30 V supply voltage and operate within a 0°C to 70°C temperature range, which may not accommodate applications requiring the TL081ID's extended temperature capability or variable supply voltage operation.

Alternative Substitutes (Performance Trade-offs)

The OPA131 series (OPA131U, OPA131UA, OPA131UA/2K5, OPA131UJ, OPA131UJ/2K5) comprises active products with ROHS3 compliance and 8-SOIC packaging. These devices feature significantly lower input bias current (5 pA) and reduced input offset voltage (200 µV) compared to the TL081ID. However, they exhibit reduced slew rate (10 V/µs) and lower output current capability (25 mA versus 40 mA). The OPA131 series operates within a -40°C to 85°C temperature range and supports supply voltages from 9 V to 36 V, providing broader compatibility than the LF356 series for variable supply applications.

Compliance and Availability Considerations

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, consistent with the TL081ID. Active product status is available for TL071CDR, LF356M/NOPB, LF356MX/NOPB, and all OPA131 variants, ensuring long-term supply chain continuity. Moisture sensitivity level 1 (unlimited) is maintained by TL081ID, TL071CDR, and TL071ID, while OPA131 variants specify MSL 3 (168 hours), requiring controlled storage conditions.

Frequently Asked Questions (FAQ)

Q: Can the TL071ID directly replace the TL081ID in all applications?

A: TL071ID maintains identical input bias current (20 pA), slew rate (16 V/µs), and output current capability (40 mA) as the TL081ID. Both support the same 8-SOIC package and extended temperature range (-40°C to 105°C). However, TL071ID is also classified as obsolete. For new designs, TL071CDR is the active equivalent, though it operates within a narrower temperature range (0°C to 70°C) and requires minimum 10 V supply voltage.

Q: What are the key differences between the TL081ID and LF356 series substitutes?

A: The LF356M/NOPB and LF356MX/NOPB maintain J-FET input architecture and 8-SOIC packaging but differ in supply voltage requirements (fixed 30 V versus TL081ID's 6–36 V range), slew rate (12 V/µs versus 16 V/µs), and input bias current (30 pA versus 20 pA). The LF356 series is suitable for applications with fixed 30 V supply rails and less stringent slew rate requirements.

Q: How do the OPA131 variants compare to the TL081ID?

A: The OPA131 series offers superior input bias current (5 pA) and input offset voltage (200 µV) specifications compared to the TL081ID (20 pA and 3 mV respectively). However, OPA131 devices exhibit reduced slew rate (10 V/µs versus 16 V/µs) and lower output current capability (25 mA versus 40 mA). OPA131 variants support supply voltages from 9 V to 36 V and operate within -40°C to 85°C range. Selection depends on whether the application prioritizes input bias current performance or slew rate and output current capability.

Q: Are there packaging differences between the TL081ID and its substitutes?

A: All recommended substitutes utilize the 8-SOIC (0.154", 3.90mm width) surface mount package, identical to the TL081ID. Packaging variants differ only in tape and reel configurations (tube, cut tape, or bulk), which do not affect electrical compatibility or PCB layout requirements.

Q: What is the significance of the obsolete product status for the TL081ID?

A: Obsolete status indicates that the TL081ID is no longer manufactured and existing inventory is limited. Active substitutes such as TL071CDR, LF356M/NOPB, LF356MX/NOPB, and OPA131 variants ensure continued availability for new production and design revisions. Selection among active substitutes should be based on electrical performance requirements and supply voltage constraints specific to the application.

Q: Do all substitutes maintain RoHS3 compliance?

A: All recommended substitutes except TL071CD maintain ROHS3 compliance. TL071CD is RoHS non-compliant and is not recommended for applications requiring regulatory compliance. TL071CDR is the ROHS3-compliant equivalent of TL071CD.

Q: What is the moisture sensitivity level (MSL) impact when substituting the TL081ID?

A: The TL081ID specifies MSL 1 (unlimited), requiring no special moisture control during storage or handling. TL071CDR and TL071ID maintain MSL 1. The OPA131 series specifies MSL 3 (168 hours), requiring controlled storage conditions and limiting shelf life to 168 hours after bag opening unless stored in a dry environment. LF356 series devices do not specify MSL in the provided data.

Q: Can the TL081ID be substituted in applications requiring extended temperature operation?

A: The TL081ID operates from -40°C to 105°C. TL071ID maintains this extended range. TL071CDR, LF356 series, and OPA131 variants operate within narrower ranges (0°C to 70°C or -40°C to 85°C). For applications requiring -40°C to 105°C operation, TL071ID is the only active or obsolete substitute maintaining full temperature compatibility. For new designs, application-specific thermal management or alternative device selection may be necessary.

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