TL071CD Equivalent & Substitute Parts

Part Overview

The TL071CD is a J-FET input operational amplifier manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device is classified as obsolete, though 1,819 units remain available in new original stock. The TL071CD serves as a precision amplifier suitable for applications requiring low input bias current and stable gain-bandwidth characteristics. Due to its obsolete status, equivalent substitute parts with active product status are available to ensure design continuity and long-term supply chain reliability.

Key Parameters

Parameter	Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	1	—
Slew Rate	13	V/µs
Gain Bandwidth Product	5.25	MHz
Current - Input Bias	65	pA
Voltage - Input Offset	3	mV
Current - Supply	1.4	mA
Voltage - Supply Span (Min)	10	V
Voltage - Supply Span (Max)	30	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 TL071CD is determined by strict equivalence across the following critical parameters: amplifier type (J-FET), number of circuits (1), package type (8-SOIC), mounting method (surface mount), and compliance certifications (ROHS3, REACH Unaffected). Substitute parts must maintain the same physical footprint and electrical interface to ensure direct replacement capability.

Substitute parts are grouped into two categories based on electrical performance alignment:

Category 1: Direct Electrical Equivalents — Parts with slew rate, gain-bandwidth product, input bias current, and supply voltage specifications that match or exceed the TL071CD baseline performance within acceptable engineering tolerances.

Category 2: Enhanced Performance Alternatives — Parts with improved electrical characteristics (higher slew rate, lower input bias current, or extended supply voltage range) that provide superior performance while maintaining backward compatibility with the TL071CD footprint and interface.

All substitute parts listed maintain 8-SOIC packaging, surface mount configuration, ROHS3 compliance, and MSL Level 1 rating.

Parameter Comparison

Part Number	Manufacturer	Product Status	Slew Rate (V/µs)	Gain BW (MHz)	Input Bias (pA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Packaging
TL071CD	Texas Instruments	Obsolete	13	5.25	65	10	30	0 to 70	Tube
TL071CDR	Texas Instruments	Active	13	5.25	65	10	30	0 to 70	Cut Tape & Digi-Reel
LF356M/NOPB	Texas Instruments	Active	12	5	30	30	30	0 to 70	Tube
LF351D	STMicroelectronics	Active	16	4	20	6	32	0 to 70	Tube
LF351DT	STMicroelectronics	Active	16	4	20	6	32	0 to 70	Cut Tape & Digi-Reel
MC33171DT	STMicroelectronics	Active	2	2.1	20000	4	44	-40 to 105	Cut Tape
TL071ACDT	STMicroelectronics	Active	16	4	20	6	36	0 to 70	Cut Tape
TL071CDT	STMicroelectronics	Active	16	4	20	6	36	0 to 70	Cut Tape & Digi-Reel
TL071IDT	STMicroelectronics	Active	16	4	20	6	36	-40 to 105	Cut Tape & Digi-Reel
TL081CDT	STMicroelectronics	Active	16	4	20	6	36	0 to 70	Cut Tape
TL081IDT	STMicroelectronics	Active	16	4	20	6	36	-40 to 105	Tape & Reel

Engineering Selection Recommendations

Primary Recommendation: TL071CDR

The TL071CDR is the direct active equivalent of the TL071CD. It maintains identical electrical specifications (13 V/µs slew rate, 5.25 MHz gain-bandwidth product, 65 pA input bias current) and supply voltage range (10 V to 30 V). The primary difference is product status (active versus obsolete) and packaging format (Cut Tape & Digi-Reel versus Tube). This part is suitable for direct replacement in all applications where the TL071CD was originally specified. Inventory availability is significantly higher at 90,400 units.

Secondary Recommendations: TL071CDT, TL071ACDT, TL081CDT

These parts share the TL071 base product number and maintain J-FET amplifier architecture with 8-SOIC packaging. They feature enhanced slew rate (16 V/µs versus 13 V/µs) and lower input bias current (20 pA versus 65 pA), providing improved performance margins. Supply voltage range extends to 36 V maximum. All three maintain active product status and ROHS3 compliance. Selection among these three depends on operating temperature requirements and packaging preference (Cut Tape formats support higher volume production).

Extended Temperature Alternative: TL071IDT, TL081IDT

For applications requiring extended operating temperature range (-40°C to 105°C), the TL071IDT and TL081IDT provide identical electrical performance to the TL071CDT and TL081CDT respectively, with expanded temperature specification. These parts are suitable for industrial and automotive environments.

Alternative Architecture: LF351D, LF351DT

The LF351 series (STMicroelectronics) provides J-FET amplifier functionality with enhanced slew rate (16 V/µs) and lower input bias current (20 pA). Supply voltage range is 6 V to 32 V, providing broader low-voltage compatibility. These parts are suitable for applications where the extended lower supply voltage limit is beneficial.

Not Recommended: MC33171DT, LF356M/NOPB

The MC33171DT is a general-purpose amplifier with significantly different electrical characteristics (2 V/µs slew rate, 2.1 MHz gain-bandwidth product, 20 nA input bias current). This part is not suitable for direct substitution where J-FET performance is required.

The LF356M/NOPB operates at fixed 30 V supply voltage with reduced slew rate (12 V/µs) and lower gain-bandwidth product (5 MHz). This part is not recommended for applications requiring the TL071CD's flexible supply voltage range.

Frequently Asked Questions (FAQ)

Q: Can the TL071CDR be used as a direct replacement for the TL071CD?

A: Yes. The TL071CDR maintains identical electrical specifications and 8-SOIC package configuration. The only differences are product status (active) and packaging format (Cut Tape & Digi-Reel instead of Tube). No circuit modifications are required.

Q: What is the primary advantage of TL071CDT over TL071CDR?

A: The TL071CDT offers enhanced electrical performance with 16 V/µs slew rate (versus 13 V/µs) and 20 pA input bias current (versus 65 pA), while maintaining the same 8-SOIC footprint. Supply voltage range extends to 36 V maximum. Both parts are active and ROHS3 compliant.

Q: Are the TL071 and TL081 series interchangeable?

A: The TL071 and TL081 share identical electrical specifications in their active variants (16 V/µs slew rate, 4 MHz gain-bandwidth product, 20 pA input bias current, 8-SOIC package). They are functionally interchangeable. The base product number difference reflects historical product line designation rather than electrical distinction.

Q: Why is the MC33171DT listed as a substitute but not recommended?

A: The MC33171DT is a general-purpose amplifier with fundamentally different electrical characteristics (2 V/µs slew rate, 2.1 MHz gain-bandwidth product, 20 nA input bias current). It does not meet the J-FET performance requirements of the TL071CD and is not suitable for direct substitution.

Q: What is the difference between Tube and Cut Tape packaging?

A: Tube packaging contains individual components in a plastic tube, suitable for lower-volume applications and manual assembly. Cut Tape & Digi-Reel packaging provides components on continuous tape with reel spooling, optimized for automated pick-and-place assembly and higher production volumes. Both formats use identical 8-SOIC components with the same electrical performance.

Q: Can I use TL071IDT in a design specified for 0°C to 70°C operation?

A: Yes. The TL071IDT is rated for -40°C to 105°C operation, which encompasses the 0°C to 70°C range. The extended temperature rating provides additional design margin and is fully compatible with applications specified for the narrower temperature range.

Q: What is the significance of the "A" designation in TL071ACDT?

A: The "A" suffix indicates a specific product variant within the TL071 family. The TL071ACDT maintains identical electrical specifications to TL071CDT and TL081CDT (16 V/µs slew rate, 4 MHz gain-bandwidth product, 20 pA input bias current). The variant designation reflects manufacturing or qualification differences rather than functional performance differences.

Q: Is the LF351 series suitable for replacing the TL071CD?

A: The LF351D and LF351DT are suitable substitutes for applications where the extended lower supply voltage limit (6 V minimum) is beneficial. They provide enhanced slew rate (16 V/µs) and lower input bias current (20 pA). However, the maximum supply voltage is 32 V versus 30 V for the TL071CD, which may be relevant in some designs.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All substitute parts listed are ROHS3 compliant, ensuring compatibility with modern manufacturing and environmental regulations.

Q: Are all substitute parts MSL Level 1?

A: Yes. All substitute parts listed maintain Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity precautions are required during storage, handling, or assembly. This matches the TL071CD specification.

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