TL034ACD Equivalent & Substitute Parts

Part Overview

The TL034ACD is a J-FET input operational amplifier manufactured by Texas Instruments, configured as a 4-circuit device in 14-SOIC surface mount packaging. This device is classified as Last Time Buy, indicating discontinued production status. The TL034ACD operates across a supply voltage range of 10V to 30V with an operating temperature range of 0°C to 70°C, making it suitable for precision analog signal processing applications requiring low input bias current characteristics inherent to J-FET amplifier designs.

Due to Last Time Buy status, identifying equivalent and substitute parts is necessary for design continuity and long-term component availability. Substitute parts are selected based on matching amplifier type, circuit count, package compatibility, and electrical performance parameters within acceptable operational ranges.

Key Parameters

Parameter	TL034ACD Value	Unit
Amplifier Type	J-FET	—
Number of Circuits	4	—
Slew Rate	5.1	V/µs
Gain Bandwidth Product	1.1	MHz
Current - Input Bias	2	pA
Voltage - Input Offset	580	µV
Current - Supply (x4 Channels)	870	µA
Current - Output / Channel	40	mA
Voltage - Supply Span (Min)	10	V
Voltage - Supply Span (Max)	30	V
Operating Temperature	0 to 70	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the TL034ACD are grouped into two primary categories based on amplifier type and electrical performance alignment:

Category 1: Direct J-FET Substitutes (Highest Compatibility)

Direct J-FET substitutes maintain the same amplifier topology and are selected when the application requires preservation of J-FET input characteristics, specifically ultra-low input bias current (pA range) and high input impedance. These parts are compatible when operating within the TL034ACD's supply voltage range (10V to 30V) and temperature operating window (0°C to 70°C).

Qualifying parts: TL034ACDR, LF247DT, LF347D, LF347DT, LT1465CS#PBF

Category 2: General Purpose Substitutes (Functional Equivalence)

General Purpose amplifiers provide functional equivalence for applications where J-FET input characteristics are not critical. These devices offer different electrical performance profiles, including higher slew rates and wider supply voltage ranges, but maintain 4-circuit configuration and 14-SOIC packaging. Selection requires verification that the application tolerates higher input bias current (nanoampere range) and different offset voltage specifications.

Qualifying parts: LM224ADT, LM248DT, LM2902AWYDT, LM324AD, LM324ADR2G

Substitution Logic Parameters:

Amplifier Type (J-FET vs. General Purpose)
Number of Circuits (4 required)
Package / Case (14-SOIC required)
Mounting Type (Surface Mount required)
Supply Voltage Range compatibility
Operating Temperature Range compatibility
Input Bias Current specifications
Output Current capability (minimum 40 mA/channel)

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA/nA)	Input Offset (µV/mV)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Packaging	Status
TL034ACD	Texas Instruments	J-FET	5.1	1.1	2 pA	580 µV	10	30	0 to 70	Tube	Last Time Buy
TL034ACDR	Texas Instruments	J-FET	5.1	1.1	2 pA	580 µV	10	30	0 to 70	Tape & Reel	Active
LF247DT	STMicroelectronics	J-FET	16	4	20 pA	3 mV	44	44	-40 to 105	Tape & Reel	Active
LF347D	STMicroelectronics	J-FET	16	3	20 pA	3 mV	44	44	0 to 70	Tube	Active
LF347DT	STMicroelectronics	J-FET	16	4	20 pA	3 mV	44	44	0 to 70	Cut Tape & Digi-Reel	Active
LT1465CS#PBF	Analog Devices Inc.	J-FET	0.9	1	0.5 pA	600 µV	10	30	-40 to 85	Tube	Active
LM224ADT	STMicroelectronics	General Purpose	0.4	1.3	20 nA	2 mV	3	30	-40 to 105	Cut Tape & Digi-Reel	Active
LM248DT	STMicroelectronics	General Purpose	0.5	1.3	30 nA	1 mV	44	44	-40 to 105	Tape & Reel	Active
LM2902AWYDT	STMicroelectronics	General Purpose	0.4	1.3	20 nA	2 mV	3	30	-40 to 125	Tape & Reel	Active
LM324AD	STMicroelectronics	General Purpose	0.4	1.3	20 nA	2 mV	3	30	0 to 70	Tube	Active
LM324ADR2G	onsemi	General Purpose	—	1	40 nA	2 mV	3	32	0 to 70	Cut Tape & Digi-Reel	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

TL034ACDR is the primary direct replacement for TL034ACD. Both devices are manufactured by Texas Instruments with identical electrical specifications. The only difference is packaging format: TL034ACDR is supplied in Tape & Reel format versus Tube format for TL034ACD. This substitute is suitable for all applications currently using TL034ACD without circuit modification. TL034ACDR maintains Active product status, ensuring long-term availability.

For J-FET Topology Preservation (Enhanced Performance):

LF347DT and LF347D are J-FET amplifiers from STMicroelectronics with enhanced slew rate (16 V/µs versus 5.1 V/µs) and higher gain bandwidth product (3-4 MHz versus 1.1 MHz). These devices operate at fixed ±22V supply (44V span) and require circuit redesign if the application uses asymmetric supplies within the TL034ACD's 10V to 30V range. LF347DT is supplied in Cut Tape & Digi-Reel format with Active status. Operating temperature range is 0°C to 70°C, matching TL034ACD.

LT1465CS#PBF from Analog Devices Inc. offers superior input bias current (0.5 pA) and operates within the TL034ACD's 10V to 30V supply range. This device is suitable for applications requiring ultra-low input bias current. Operating temperature range extends to -40°C to 85°C. Product status is Active.

For General Purpose Applications (Cost Optimization):

LM324AD and LM324ADR2G are general purpose amplifiers with Active product status. Both operate within the TL034ACD's 0°C to 70°C temperature range and support supply voltages from 3V to 30V (or 32V for LM324ADR2G). These substitutes are appropriate only when J-FET input characteristics are not required. Input bias current is significantly higher (20-40 nanoamperes versus 2 picoamperes), which may affect circuit performance in high-impedance applications.

LM2902AWYDT includes automotive qualification (AEC-Q100) and extends operating temperature to -40°C to 125°C. This device is suitable for automotive applications requiring general purpose amplification.

Compliance and Certification:

All substitute parts listed maintain ROHS3 compliance and REACH Unaffected status, matching the TL034ACD regulatory profile. All devices are classified under ECCN EAR99 and HTSUS 8542.33.0001.

Frequently Asked Questions (FAQ)

Q1: Can TL034ACDR be used as a direct drop-in replacement for TL034ACD?

A: Yes. TL034ACDR is electrically identical to TL034ACD with matching specifications across all parameters: slew rate (5.1 V/µs), gain bandwidth product (1.1 MHz), input bias current (2 pA), input offset voltage (580 µV), and supply voltage range (10V to 30V). The only difference is packaging format (Tape & Reel versus Tube). No circuit modifications are required.

Q2: What is the primary difference between J-FET and General Purpose amplifier substitutes?

A: J-FET amplifiers feature input bias current in the picoampere range (2-20 pA), making them suitable for high-impedance signal sources and precision measurement circuits. General Purpose amplifiers have input bias current in the nanoampere range (20-40 nA), approximately 10,000 times higher. Selection depends on whether the application requires ultra-low input bias current characteristics.

Q3: Can LF247DT or LF347DT be used in circuits designed for TL034ACD?

A: LF247DT and LF347DT are J-FET amplifiers with enhanced performance (16 V/µs slew rate, 3-4 MHz gain bandwidth product). However, these devices operate at fixed ±22V supply (44V span), whereas TL034ACD operates across 10V to 30V. Circuit redesign is required if the application uses asymmetric supplies or supply voltages outside the ±22V range. If the circuit can accommodate ±22V supplies, these devices provide superior dynamic performance.

Q4: Are LM324 series devices suitable replacements for TL034ACD?

A: LM324 series devices (LM324AD, LM324ADR2G) are general purpose amplifiers, not J-FET types. They are functionally equivalent only for applications where J-FET input characteristics are not critical. Input bias current is approximately 10,000 times higher (20-40 nanoamperes versus 2 picoamperes). These devices are suitable for general signal processing but not for high-impedance or precision measurement applications.

Q5: What packaging options are available for TL034ACD substitutes?

A: Substitute parts are available in multiple packaging formats: Tube (TL034ACDR, LF347D, LT1465CS#PBF, LM324AD), Tape & Reel (LF247DT, LM248DT, LM2902AWYDT), and Cut Tape & Digi-Reel (LF347DT, LM224ADT, LM324ADR2G). Selection depends on manufacturing process requirements and component handling systems.

Q6: Which substitute offers the lowest input bias current?

A: LT1465CS#PBF from Analog Devices Inc. offers the lowest input bias current at 0.5 pA, compared to TL034ACD at 2 pA. This device is suitable for applications requiring maximum input impedance and minimal bias current effects. LT1465CS#PBF operates within TL034ACD's 10V to 30V supply range and maintains J-FET amplifier topology.

Q7: Can TL034ACD substitutes be used in automotive applications?

A: LM2902AWYDT is specifically qualified for automotive applications with AEC-Q100 certification and extended operating temperature range (-40°C to 125°C). Other substitutes do not carry automotive qualification. If automotive qualification is required, LM2902AWYDT is the appropriate selection.

Q8: What is the inventory status of substitute parts?

A: All listed substitute parts maintain Active product status with substantial inventory availability: TL034ACDR (20,828 pcs), LF247DT (17,352 pcs), LF347D (16,726 pcs), LF347DT (27,321 pcs), LM224ADT (34,870 pcs), LM248DT (1,479 pcs), LM2902AWYDT (3,106 pcs), LM324AD (2,037 pcs), LM324ADR2G (10,300 pcs), and LT1465CS#PBF (5,145 pcs). TL034ACD is Last Time Buy status with 1,092 pcs remaining.

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