TL081BCD Equivalent & Substitute Parts

Part Overview

The TL081BCD is a J-FET input operational amplifier manufactured by Texas Instruments, housed in an 8-SOIC surface mount package. This device is classified as obsolete, though 991 pieces remain available in new original stock. The TL081BCD serves as a general-purpose operational amplifier suitable for applications requiring low input bias current and low input offset voltage characteristics inherent to J-FET input designs.

Due to its obsolete product status, identifying equivalent and substitute parts is necessary for design continuity, long-term supply chain reliability, and new production planning. Active alternatives with compatible electrical and mechanical specifications are available from both Texas Instruments and alternative manufacturers.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	1	—
Slew Rate	13	V/µs
Gain Bandwidth Product	3	MHz
Current - Input Bias	30	pA
Voltage - Input Offset	2	mV
Current - Supply	1.4	mA
Voltage - Supply Span (Min)	7	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	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the TL081BCD is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Amplifier Type: J-FET input topology
Number of Circuits: Single circuit configuration
Voltage Supply Range: Minimum 7 V to maximum 36 V
Operating Temperature Range: 0°C to 70°C
Input Bias Current: 30 pA nominal
Input Offset Voltage: 2 mV nominal
Supply Current: 1.4 mA nominal

Mechanical Compatibility Criteria:

Package Type: 8-SOIC surface mount
Package Dimensions: 0.154" width (3.90mm)
Mounting Type: Surface mount

Substitute parts are grouped into two categories based on their electrical performance relative to the TL081BCD:

Category 1 - Direct Equivalents (Identical Electrical Specifications): Parts that maintain all key electrical parameters within the TL081BCD specification envelope. These include the TL081BCDR (active product status, tape & reel packaging) and TL081CDT (active product status, cut tape packaging).

Category 2 - Functional Alternatives (Enhanced or Modified Specifications): Parts that operate within compatible voltage and temperature ranges but feature different slew rates, gain bandwidth products, or input bias currents. These include the LF356M/NOPB, LF356MX/NOPB, TL071CDT, TL081IDT, and MC33171DT. These alternatives maintain J-FET input characteristics and 8-SOIC packaging but offer performance variations suitable for specific application requirements.

Parameter Comparison

Parameter	TL081BCD	TL081BCDR	TL081CDT	TL081IDT	TL071CDT	LF356M/NOPB	LF356MX/NOPB	MC33171DT
Manufacturer	Texas Instruments	Texas Instruments	STMicroelectronics	STMicroelectronics	STMicroelectronics	Texas Instruments	Texas Instruments	STMicroelectronics
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
Amplifier Type	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET	J-FET	General Purpose
Slew Rate (V/µs)	13	13	16	16	16	12	12	2
Gain Bandwidth Product (MHz)	3	3	4	4	4	5	5	2.1
Current - Input Bias (pA)	30	30	20	20	20	30	30	20 nA
Voltage - Input Offset (mV)	2	2	3	3	3	3	3	1
Current - Supply (mA)	1.4	1.4	1.4	1.4	1.4	5	5	0.22
Voltage - Supply Span Min (V)	7	7	6	6	6	30	30	4
Voltage - Supply Span Max (V)	36	36	36	36	36	30	30	44
Operating Temperature (°C)	0 to 70	0 to 70	0 to 70	-40 to 105	0 to 70	0 to 70	0 to 70	-40 to 105
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Packaging Type	Tube	Tape & Reel	Cut Tape	Tape & Reel	Cut Tape & Digi-Reel	Tube	Cut Tape & Digi-Reel	Cut Tape
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

TL081BCDR - Texas Instruments, Active Status This part maintains identical electrical specifications to the TL081BCD across all critical parameters: 13 V/µs slew rate, 3 MHz gain bandwidth product, 30 pA input bias current, and 2 mV input offset voltage. The only difference is packaging format (tape & reel versus tube). This part is actively manufactured and represents the direct equivalent for new production designs. Inventory availability is 2,800 pieces.

TL081CDT - STMicroelectronics, Active Status This STMicroelectronics variant maintains the same base product number (TL081) and operates within the TL081BCD electrical envelope. It features a 16 V/µs slew rate and 4 MHz gain bandwidth product, representing a performance enhancement. Input bias current is reduced to 20 pA. The part is actively produced with 3,600 pieces in stock and is suitable for applications where enhanced slew rate performance is beneficial.

Secondary Substitutes (Functional Alternatives):

TL081IDT - STMicroelectronics, Active Status This variant extends the operating temperature range to -40°C to 105°C while maintaining J-FET input characteristics and 8-SOIC packaging. It features 16 V/µs slew rate and 4 MHz gain bandwidth product. This part is appropriate for applications requiring extended temperature operation. Inventory: 1,900 pieces.

TL071CDT - STMicroelectronics, Active Status This J-FET amplifier offers 16 V/µs slew rate and 4 MHz gain bandwidth product with 20 pA input bias current. It maintains compatibility with the TL081BCD supply voltage range and operating temperature. This part is actively produced with 6,375 pieces available.

LF356M/NOPB and LF356MX/NOPB - Texas Instruments, Active Status These BI-FET™ series amplifiers feature enhanced 5 MHz gain bandwidth product and 12 V/µs slew rate. However, they require a fixed 30 V supply voltage (not a range), and supply current increases to 5 mA. These parts are suitable for applications where higher bandwidth is required and fixed supply voltage is available. Inventory: 30,916 pieces (LF356M/NOPB) and 90,234 pieces (LF356MX/NOPB).

MC33171DT - STMicroelectronics, Active Status This general-purpose amplifier differs significantly from the TL081BCD in amplifier type and performance characteristics. It features 2 V/µs slew rate, 2.1 MHz gain bandwidth product, and 20 nA input bias current. It operates across a wider supply voltage range (4 V to 44 V) and extended temperature range (-40°C to 105°C). This part is suitable only for applications where J-FET input characteristics are not critical. Inventory: 5,400 pieces.

Compliance and Certification: All substitute parts maintain ROHS3 compliance, MSL Level 1 (unlimited moisture sensitivity), and REACH unaffected status, matching the TL081BCD regulatory profile.

Frequently Asked Questions (FAQ)

Q: Can the TL081BCDR be used as a direct replacement for the TL081BCD?

A: Yes. The TL081BCDR is electrically identical to the TL081BCD across all specified parameters. The only difference is packaging format: TL081BCDR is supplied in tape & reel format while TL081BCD is supplied in tube format. Both are 8-SOIC surface mount packages with identical pinout and electrical performance.

Q: What is the difference between TL081CDT and TL081BCD?

A: The TL081CDT is manufactured by STMicroelectronics rather than Texas Instruments, and features enhanced performance: 16 V/µs slew rate versus 13 V/µs, 4 MHz gain bandwidth product versus 3 MHz, and reduced input bias current of 20 pA versus 30 pA. Both operate within the same supply voltage range (6 V to 36 V for TL081CDT, 7 V to 36 V for TL081BCD) and temperature range (0°C to 70°C). The TL081CDT is actively produced.

Q: Why would I choose LF356M/NOPB over TL081CDT?

A: The LF356M/NOPB offers higher gain bandwidth product (5 MHz versus 4 MHz) and faster slew rate (12 V/µs versus 16 V/µs for TL081CDT). However, it requires a fixed 30 V supply voltage rather than a range, and consumes higher supply current (5 mA versus 1.4 mA). Selection depends on application requirements for bandwidth, power consumption, and supply voltage flexibility.

Q: Is MC33171DT a suitable substitute for TL081BCD?

A: MC33171DT is not recommended as a direct substitute. While it shares the 8-SOIC package and operates across a wider supply voltage range, it is a general-purpose amplifier rather than a J-FET input amplifier. It features significantly different electrical characteristics: 2 V/µs slew rate (versus 13 V/µs), 2.1 MHz gain bandwidth product (versus 3 MHz), and 20 nA input bias current (versus 30 pA). Use MC33171DT only when J-FET input characteristics are not required by the application.

Q: What is the difference between LF356M/NOPB and LF356MX/NOPB?

A: Both parts are electrically identical with identical electrical specifications. The difference is packaging format: LF356M/NOPB is supplied in tube format, while LF356MX/NOPB is supplied in cut tape & Digi-Reel® format. Both are 8-SOIC surface mount packages. Selection depends on production assembly requirements and packaging preferences.

Q: Can I use TL081IDT in applications requiring 0°C to 70°C operation?

A: Yes. The TL081IDT operates across -40°C to 105°C, which encompasses the 0°C to 70°C range. It maintains all electrical specifications required for TL081BCD compatibility within this broader temperature range. The extended temperature capability does not affect performance in standard 0°C to 70°C applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance status, matching the TL081BCD regulatory requirement. All parts also maintain MSL Level 1 (unlimited) moisture sensitivity rating and REACH unaffected status.

Q: What is the primary reason to transition from TL081BCD to an active substitute?

A: The TL081BCD is classified as obsolete. While 991 pieces remain in stock, long-term supply cannot be guaranteed. Active alternatives such as TL081BCDR, TL081CDT, and TL071CDT ensure continued availability for production and future design iterations. Active products receive ongoing manufacturing support and supply chain reliability.

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