TL081CD Equivalent & Substitute Parts

Part Overview

The TL081CD 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 support and procurement. The TL081CD 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 low input offset voltage characteristics inherent to J-FET input designs.

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	0 to 70	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the TL081CD is determined by strict alignment of electrical and mechanical parameters within the J-FET operational amplifier category. The critical parameters governing substitution are:

Primary Substitution Criteria:

Amplifier Type: J-FET input configuration
Package / Case: 8-SOIC form factor (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Number of Circuits: Single circuit (1)
Slew Rate: 16 V/µs or greater
Gain Bandwidth Product: 4 MHz or greater
Current - Input Bias: 20 pA or lower
Voltage - Input Offset: 3 mV or lower
Voltage - Supply Span: Minimum 6 V, Maximum 36 V
Operating Temperature Range: 0°C to 70°C or extended range

Substitute parts are grouped into two categories based on amplifier type and performance characteristics:

Category A: J-FET Input Amplifiers (Direct Substitutes) Parts maintaining J-FET input architecture with equivalent or superior electrical performance: TL071CDR, TL071ID

Category B: J-FET and General Purpose Amplifiers (Functional Alternatives) Parts with J-FET or general purpose input stages offering compatible electrical parameters within the 8-SOIC package: LF356M/NOPB, LF356MX/NOPB, OPA131U, OPA131UA, OPA131UA/2K5, OPA131UJ, OPA131UJ/2K5

Parameter Comparison

Parameter	TL081CD	TL071CDR	TL071ID	LF356M/NOPB	LF356MX/NOPB	OPA131U	OPA131UA	OPA131UJ
Amplifier Type	J-FET	J-FET	J-FET	J-FET	J-FET	General Purpose	General Purpose	J-FET
Slew Rate (V/µs)	16	13	16	12	12	10	10	10
Gain Bandwidth Product (MHz)	4	5.25	4	5	5	4	4	4
Current - Input Bias (pA)	20	65	20	30	30	5	5	5
Voltage - Input Offset (mV)	3	3	3	3	3	0.2	0.2	0.2
Current - Supply (mA)	1.4	1.4	1.4	5	5	1.5	1.5	1.5
Current - Output / Channel (mA)	40	—	40	—	—	25	25	25
Voltage - Supply Span Min (V)	6	10	6	30	30	9	9	9
Voltage - Supply Span Max (V)	36	30	36	30	30	36	36	36
Operating Temperature (°C)	0 to 70	0 to 70	-40 to 105	0 to 70	0 to 70	-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
Product Status	Obsolete	Active	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: TL071CDR

The TL071CDR is the preferred substitute for the TL081CD. Both devices maintain J-FET input architecture and are housed in identical 8-SOIC packages. The TL071CDR is manufactured by Texas Instruments and carries Active product status with ROHS3 compliance. The TL071CDR delivers superior gain bandwidth product (5.25 MHz versus 4 MHz) and maintains equivalent input bias current and offset voltage specifications. The TL071CDR operates across a 10 V to 30 V supply range, which encompasses the TL081CD's 6 V to 36 V range for most practical applications. The slew rate of 13 V/µs is marginally lower than the TL081CD's 16 V/µs but remains suitable for general-purpose amplification. Inventory availability is substantial at 90,400 units.

Secondary Recommendation: TL071ID

The TL071ID provides an alternative J-FET input substitute with identical electrical performance to the TL081CD, including 16 V/µs slew rate and 4 MHz gain bandwidth product. Manufactured by STMicroelectronics, this device is classified as Obsolete but maintains ROHS3 compliance. The TL071ID supports an extended operating temperature range of -40°C to 105°C, exceeding the TL081CD's 0°C to 70°C specification. Supply voltage range is 6 V to 36 V, matching the TL081CD exactly. Current inventory is 2,768 units.

Tertiary Recommendations: LF356M/NOPB and LF356MX/NOPB

The LF356 series (BI-FET™ technology) from Texas Instruments offers J-FET input performance in 8-SOIC packages with Active product status. Both variants deliver 5 MHz gain bandwidth product and 12 V/µs slew rate. Input bias current is 30 pA, slightly elevated from the TL081CD's 20 pA specification. Supply voltage range is fixed at 30 V, which is within the TL081CD's maximum but above its 6 V minimum. The LF356M/NOPB is packaged in Tube format with 30,916 units in stock, while the LF356MX/NOPB is supplied in Cut Tape & Digi-Reel® format with 90,234 units available.

Alternative Consideration: OPA131 Series

The OPA131 family (OPA131U, OPA131UA, OPA131UA/2K5, OPA131UJ, OPA131UJ/2K5) from Texas Instruments and Burr Brown represents a general-purpose amplifier alternative with J-FET input characteristics. These devices deliver 4 MHz gain bandwidth product matching the TL081CD and operate across 9 V to 36 V supply range. Input bias current is significantly lower at 5 pA, and input offset voltage is reduced to 200 µV. Operating temperature range extends to -40°C to 85°C. Output current per channel is 25 mA, lower than the TL081CD's 40 mA specification. All OPA131 variants maintain ROHS3 compliance and Active product status. Inventory across the OPA131 family ranges from 1,350 to 12,800 units depending on packaging variant.

Frequently Asked Questions (FAQ)

Q: Can the TL071CDR directly replace the TL081CD in all applications?

A: The TL071CDR is compatible with the TL081CD in applications operating within the 10 V to 30 V supply range. The TL081CD supports operation down to 6 V; applications requiring this lower voltage threshold require verification of the TL071CDR's 10 V minimum specification. Both devices share identical 8-SOIC packaging, J-FET input architecture, and equivalent input bias current and offset voltage characteristics. The TL071CDR's 5.25 MHz gain bandwidth product exceeds the TL081CD's 4 MHz specification, providing improved frequency response.

Q: What is the difference between J-FET and general-purpose amplifier types in the substitute list?

A: J-FET input amplifiers (TL081CD, TL071CDR, TL071ID, LF356M/NOPB, LF356MX/NOPB, OPA131UJ, OPA131UJ/2K5) utilize junction field-effect transistor input stages, delivering extremely low input bias current (typically 5 to 65 pA) and high input impedance. General-purpose amplifiers (OPA131U, OPA131UA, OPA131UA/2K5) employ bipolar input stages with lower input bias current (5 pA) and lower input offset voltage (200 µV) but may exhibit different frequency response characteristics. Selection depends on application requirements for input impedance and bias current performance.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed carry ROHS3 compliance certification. The TL081CD itself is ROHS3 compliant. This ensures compatibility with environmental and regulatory requirements across all listed alternatives.

Q: What packaging options are available for substitute parts?

A: All substitute parts are housed in 8-SOIC (0.154", 3.90mm Width) surface mount packages, maintaining mechanical compatibility with the TL081CD. Packaging variants differ in distribution format: Tube, Cut Tape & Digi-Reel®, Tape & Reel (TR), and Bulk. These distinctions affect procurement and handling but do not alter electrical performance or physical dimensions.

Q: How does supply voltage range affect substitution?

A: The TL081CD operates across 6 V to 36 V. The TL071CDR operates across 10 V to 30 V, which is a subset of the TL081CD's range. Applications requiring operation below 10 V or above 30 V require alternative substitutes such as TL071ID (6 V to 36 V) or OPA131 series (9 V to 36 V). Verify supply voltage requirements before component selection.

Q: What is the significance of product status (Active versus Obsolete)?

A: Active status indicates ongoing manufacturing and long-term availability. Obsolete status indicates discontinued production. The TL081CD and TL071ID are classified as Obsolete, necessitating substitution with Active alternatives such as TL071CDR, LF356M/NOPB, LF356MX/NOPB, or OPA131 series for new designs and long-term procurement security.

Q: How do slew rate differences impact circuit performance?

A: Slew rate determines the maximum rate of voltage change at the amplifier output. The TL081CD delivers 16 V/µs, while the TL071CDR delivers 13 V/µs and the LF356 series delivers 12 V/µs. Lower slew rates may introduce distortion in high-frequency or high-amplitude signal applications. Applications with stringent slew rate requirements should prioritize TL071ID (16 V/µs) or TL081CD itself if available.

Q: What inventory considerations apply to substitute selection?

A: Inventory availability varies significantly across substitute parts. The LF356MX/NOPB offers the highest availability at 90,234 units, followed by TL071CDR at 90,400 units. The OPA131UA/2K5 offers the lowest availability at 1,350 units. Procurement timelines and supply chain stability may influence substitute selection when multiple electrical alternatives exist.

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