TL081ACD Equivalent & Substitute Parts

Part Overview

The TL081ACD is a J-FET input operational amplifier manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device is classified as obsolete, though 1192 pieces remain available in new original stock. The TL081ACD serves as a general-purpose J-FET amplifier suitable for applications requiring low input bias current and moderate bandwidth performance. Due to its obsolete status, equivalent and substitute parts with active product status are necessary for new designs and long-term supply chain continuity.

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	3	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	—

Substitute Part Grouping Explanation

Substitution of the TL081ACD is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Package type: 8-SOIC surface mount form factor (0.154", 3.90mm width)
Amplifier topology: J-FET input configuration
Number of circuits: Single amplifier per package
Supply voltage range: Minimum 7 V to maximum 36 V
Input bias current: 30 pA maximum
Input offset voltage: 3 mV maximum
Operating temperature range: 0°C to 70°C
Compliance: ROHS3 compliant, REACH unaffected

Substitute Categories:

Category 1: Direct J-FET Equivalents (Highest Compatibility) Parts maintaining identical J-FET amplifier topology with matching or superior electrical performance within the specified parameter envelope.

Category 2: Enhanced J-FET Alternatives J-FET amplifiers with improved performance characteristics (higher bandwidth, faster slew rate) while maintaining package compatibility and supply voltage requirements.

Category 3: General Purpose Alternatives General purpose amplifiers with compatible package and supply voltage specifications, suitable for applications where J-FET input characteristics are not mandatory.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	Gain Bandwidth (MHz)	Input Bias (pA)	Input Offset (mV)	Supply Current (mA)	Supply Voltage Min (V)	Supply Voltage Max (V)	Temp Range (°C)	Product Status
TL081ACD	Texas Instruments	J-FET	13	3	30	3	1.4	7	36	0 to 70	Obsolete
TL081ACDR	Texas Instruments	J-FET	13	3	30	3	1.4	7	36	0 to 70	Active
TL081CDT	STMicroelectronics	J-FET	16	4	20	3	1.4	6	36	0 to 70	Active
TL071CDT	STMicroelectronics	J-FET	16	4	20	3	1.4	6	36	0 to 70	Active
TL081IDT	STMicroelectronics	J-FET	16	4	20	3	1.4	6	36	-40 to 105	Active
LF356M/NOPB	Texas Instruments	J-FET	12	5	30	3	5	30	30	0 to 70	Active
LF356MX/NOPB	Texas Instruments	J-FET	12	5	30	3	5	30	30	0 to 70	Active
CA3140AMZ	Renesas Electronics	General Purpose	9	4.5	10	2	4	4	36	-55 to 125	Active
MC33171DT	STMicroelectronics	General Purpose	2	2.1	20	1	0.22	4	44	-40 to 105	Active

Engineering Selection Recommendations

Tier 1: Direct Replacement (Identical Specifications)

TL081ACDR is the direct active equivalent of TL081ACD, manufactured by Texas Instruments with identical electrical specifications and 8-SOIC packaging. This part maintains 100% parameter compatibility and is available in 2895 pieces of new original stock. Selection of TL081ACDR eliminates all substitution risk and is the preferred choice for direct replacement applications.

Tier 2: Enhanced J-FET Alternatives (Superior Performance)

TL081CDT and TL071CDT, both manufactured by STMicroelectronics, provide enhanced J-FET performance with 16 V/µs slew rate and 4 MHz bandwidth compared to the original 13 V/µs and 3 MHz. These parts maintain the same 8-SOIC package, 1.4 mA supply current, and 3 mV input offset voltage. Input bias current is reduced to 20 pA. Both parts are active products with substantial inventory availability (6375 and 3600 pieces respectively). TL081IDT extends the operating temperature range to -40°C to 105°C while maintaining identical electrical performance to TL081CDT.

Tier 3: J-FET Alternatives with Supply Voltage Constraints

LF356M/NOPB and LF356MX/NOPB are Texas Instruments BI-FET series amplifiers with 5 MHz bandwidth and 12 V/µs slew rate. These parts require fixed 30 V supply voltage (not the 7–36 V range of TL081ACD) and consume 5 mA supply current. Use is restricted to applications with 30 V supply availability. Inventory is substantial (30916 and 90234 pieces respectively).

Tier 4: General Purpose Alternatives (Topology Deviation)

CA3140AMZ (Renesas Electronics) and MC33171DT (STMicroelectronics) are general purpose amplifiers with different input stage topology. CA3140AMZ provides 4.5 MHz bandwidth with extended temperature range (-55°C to 125°C) and lower input bias current (10 pA). MC33171DT offers ultra-low supply current (220 µA) and extended supply voltage range (4–44 V) but reduced bandwidth (2.1 MHz) and slew rate (2 V/µs). These alternatives are suitable only for applications where J-FET input characteristics are not required.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original TL081ACD certification requirements. All parts are surface mount 8-SOIC devices with MSL 1 (unlimited moisture sensitivity).

Frequently Asked Questions (FAQ)

Q1: Can TL081ACDR be used as a direct replacement for TL081ACD?

Yes. TL081ACDR is manufactured by Texas Instruments with identical electrical specifications, package type, and operating parameters. The only difference is product status (active versus obsolete) and packaging format (Cut Tape & Digi-Reel versus Tube). No circuit modifications are required.

Q2: What is the primary difference between TL081CDT and TL081ACD?

TL081CDT is manufactured by STMicroelectronics and provides enhanced performance: 16 V/µs slew rate versus 13 V/µs, 4 MHz bandwidth versus 3 MHz, and reduced input bias current of 20 pA versus 30 pA. Minimum supply voltage is 6 V instead of 7 V. All other parameters remain compatible. TL081CDT is suitable for applications requiring faster response characteristics.

Q3: Why do LF356M/NOPB and LF356MX/NOPB require 30 V supply voltage?

The LF356 series is specified with a fixed 30 V supply voltage requirement, unlike the TL081ACD which operates across 7–36 V. These parts are suitable only for applications with dedicated 30 V power supplies. They are not recommended for variable or lower voltage supply systems.

Q4: Is CA3140AMZ compatible with TL081ACD in all applications?

CA3140AMZ uses general purpose amplifier topology rather than J-FET input configuration. While package and supply voltage are compatible, input bias current characteristics differ significantly (10 pA versus 30 pA). CA3140AMZ is suitable for applications where J-FET input characteristics are not critical. Verify application requirements before substitution.

Q5: What is the advantage of TL081IDT over TL081CDT?

TL081IDT extends the operating temperature range to -40°C to 105°C while maintaining identical electrical performance to TL081CDT (16 V/µs slew rate, 4 MHz bandwidth, 20 pA input bias current). Selection depends on required temperature operating range. For standard 0–70°C applications, both parts are equivalent.

Q6: Can MC33171DT replace TL081ACD in low-power applications?

MC33171DT offers ultra-low supply current (220 µA versus 1.4 mA) and extended supply voltage range (4–44 V). However, bandwidth is reduced to 2.1 MHz and slew rate to 2 V/µs. This part is suitable only for applications where low power consumption is prioritized over bandwidth and slew rate performance.

Q7: Are all substitute parts available in the same 8-SOIC package?

Yes. All substitute parts listed are manufactured in 8-SOIC (0.154", 3.90mm width) surface mount packaging, ensuring mechanical compatibility with TL081ACD PCB layouts. No package adapter or redesign is required.

Q8: What is the difference between TL071CDT and TL081CDT?

TL071CDT and TL081CDT are functionally identical in electrical performance (16 V/µs slew rate, 4 MHz bandwidth, 20 pA input bias current, 1.4 mA supply current). Both are manufactured by STMicroelectronics in 8-SOIC packaging. Selection between these parts depends on inventory availability and supplier preference, as they are direct equivalents.

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