TL034CD Equivalent & Substitute Parts

Part Overview

The TL034CD is a J-FET input operational amplifier integrated circuit manufactured by Texas Instruments, configured as a 4-circuit device in a 14-SOIC surface mount package. This component is classified as a Last Time Buy product, indicating discontinued production with limited remaining inventory. The TL034CD operates across a supply voltage range of 10V to 30V with low input bias current characteristics typical of J-FET amplifier designs. Identification of equivalent and substitute parts is necessary due to the Last Time Buy status and to support design flexibility across manufacturing batches and packaging formats.

Key Parameters

Parameter	Value
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	790 µV
Current - Supply	870 µA (x4 Channels)
Current - Output / Channel	40 mA
Voltage - Supply Span	10 V to 30 V
Operating Temperature	0°C to 70°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TL034CD is determined by the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: J-FET input configuration
Number of Circuits: 4-circuit configuration
Package / Case: 14-SOIC form factor
Mounting Type: Surface Mount
Current - Output / Channel: 40 mA minimum
Voltage - Supply Span: Minimum 10V to 30V overlap required

Substitution Categories:

Category 1: Direct Equivalent (Identical Specifications) The TL034CDR represents a direct equivalent with identical electrical specifications and J-FET amplifier type. The primary difference is packaging format (Cut Tape & Digi-Reel versus Tube) and product status (Active versus Last Time Buy).

Category 2: J-FET Amplifiers with Enhanced Performance The LF247DT and LF347D/LF347DT are J-FET amplifiers with improved slew rate (16 V/µs versus 5.1 V/µs) and higher gain bandwidth product (3-4 MHz versus 1.1 MHz). These devices maintain the 4-circuit configuration and 14-SOIC package but operate across a wider supply voltage range (±22V, 44V total span). Operating temperature extends to -40°C to 105°C for LF247DT.

Category 3: General Purpose Amplifiers The LM124DT, LM224ADT, LM224D, LM224DR2G, LM224DT, and LM248DT are general purpose amplifiers with 4-circuit configuration in 14-SOIC packages. These devices feature lower input bias current (20-90 nanoamperes versus 2 picoamperes) and reduced slew rate (0.4-0.5 V/µs versus 5.1 V/µs). Supply voltage range extends to 3V minimum, providing broader operational flexibility.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Number of Circuits	Slew Rate (V/µs)	Gain Bandwidth Product (MHz)	Current - Input Bias	Voltage - Input Offset	Current - Output / Channel (mA)	Voltage - Supply Span (V)	Operating Temperature (°C)	Package / Case	Product Status
TL034CD	Texas Instruments	J-FET	4	5.1	1.1	2 pA	790 µV	40	10-30	0-70	14-SOIC	Last Time Buy
TL034CDR	Texas Instruments	J-FET	4	5.1	1.1	2 pA	790 µV	40	10-30	0-70	14-SOIC	Active
LF247DT	STMicroelectronics	J-FET	4	16	4	20 pA	3 mV	40	±22 (44)	-40-105	14-SOIC	Active
LF347D	STMicroelectronics	J-FET	4	16	3	20 pA	3 mV	40	±22 (44)	0-70	14-SOIC	Active
LF347DT	STMicroelectronics	J-FET	4	16	4	20 pA	3 mV	40	±22 (44)	0-70	14-SOIC	Active
LM124DT	STMicroelectronics	General Purpose	4	0.4	1.3	20 nA	2 mV	40	3-30	-55-125	14-SOIC	Active
LM224ADT	STMicroelectronics	General Purpose	4	0.4	1.3	20 nA	2 mV	40	3-30	-40-105	14-SOIC	Active
LM224D	STMicroelectronics	General Purpose	4	0.4	1.2	20 nA	2 mV	40	3-30	-40-105	14-SOIC	Active
LM224DR2G	onsemi	General Purpose	4	—	1	90 nA	2 mV	40	3-32	-25-85	14-SOIC	Active
LM224DT	STMicroelectronics	General Purpose	4	0.4	1.3	20 nA	2 mV	40	3-30	-40-105	14-SOIC	Active
LM248DT	STMicroelectronics	General Purpose	4	0.5	1.3	30 nA	1 mV	25	±22 (44)	-40-105	14-SOIC	Active

Engineering Selection Recommendations

Direct Replacement (Identical Specifications): The TL034CDR is the recommended direct replacement for the TL034CD. Both devices are manufactured by Texas Instruments with identical electrical specifications, J-FET amplifier type, and 14-SOIC package. The TL034CDR maintains Active product status with significantly higher inventory availability (18,823 pieces versus 1,834 pieces). Selection of TL034CDR eliminates any performance variation while ensuring long-term supply continuity.

J-FET Amplifier Alternatives (Enhanced Performance): The LF247DT and LF347D/LF347DT series are suitable for applications requiring improved dynamic performance. These devices provide 3-4 times higher slew rate and 3-4 times higher gain bandwidth product compared to the TL034CD. The LF247DT extends operating temperature to -40°C to 105°C and operates across ±22V supply rails. The LF347D maintains the 0°C to 70°C operating range matching the TL034CD. All three devices maintain J-FET input characteristics with 4-circuit configuration and 14-SOIC packaging. Selection of these alternatives is appropriate when circuit design permits the higher performance specifications.

General Purpose Amplifier Alternatives (Broader Supply Range): The LM124DT, LM224ADT, LM224D, LM224DR2G, and LM224DT devices provide general purpose amplification with extended supply voltage range (3V minimum versus 10V minimum). These alternatives feature lower input bias current (20-90 nanoamperes versus 2 picoamperes) and reduced slew rate (0.4-0.5 V/µs versus 5.1 V/µs). The LM224DR2G is available from onsemi with the highest inventory (105,200 pieces). Selection of general purpose alternatives is appropriate for applications where J-FET input characteristics are not critical and lower supply voltage operation is beneficial.

Compliance and Certification: All substitute parts listed maintain ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), and REACH Unaffected status, matching the TL034CD certification profile. All devices are classified under ECCN EAR99 and HTSUS 8542.33.0001.

Frequently Asked Questions (FAQ)

Q: Can the TL034CDR be used as a direct replacement for the TL034CD? A: Yes. The TL034CDR is electrically identical to the TL034CD with matching J-FET amplifier type, 4-circuit configuration, slew rate (5.1 V/µs), gain bandwidth product (1.1 MHz), input bias current (2 pA), and supply voltage range (10V to 30V). The primary difference is packaging format (Cut Tape & Digi-Reel versus Tube) and product status (Active versus Last Time Buy). Both devices are manufactured by Texas Instruments in the 14-SOIC package.

Q: What are the key differences between the TL034CD and the LF247DT? A: Both devices are J-FET amplifiers with 4-circuit configuration in 14-SOIC packages. The LF247DT provides enhanced performance with slew rate of 16 V/µs (versus 5.1 V/µs) and gain bandwidth product of 4 MHz (versus 1.1 MHz). The LF247DT operates across ±22V supply rails (44V total span) compared to the TL034CD's 10V to 30V range. The LF247DT extends operating temperature to -40°C to 105°C. Input bias current is higher at 20 pA versus 2 pA. The LF247DT is manufactured by STMicroelectronics.

Q: When should I select a general purpose amplifier alternative instead of a J-FET amplifier? A: General purpose amplifier alternatives (LM224 series, LM124DT, LM248DT) are appropriate when circuit design does not require the ultra-low input bias current characteristic of J-FET amplifiers. These alternatives provide extended supply voltage range (3V minimum) and are available in higher quantities. Selection is based on application requirements for input impedance, bias current, and supply voltage range rather than performance specifications.

Q: Are all substitute parts available in the same 14-SOIC package? A: Yes. All substitute parts listed are available in 14-SOIC (0.154", 3.90mm Width) surface mount packages. Packaging formats differ (Tube, Cut Tape & Digi-Reel, Tape & Reel) but the physical package dimensions and pin configuration remain consistent across all alternatives.

Q: What is the significance of the Last Time Buy status for the TL034CD? A: Last Time Buy status indicates that Texas Instruments has discontinued production of the TL034CD. Existing inventory (1,834 pieces) represents the final available supply. The TL034CDR provides an Active product alternative with identical specifications and significantly higher inventory availability (18,823 pieces), ensuring long-term supply continuity for new designs and production requirements.

Q: Do all substitute parts maintain the same compliance certifications as the TL034CD? A: Yes. All substitute parts listed maintain ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), and REACH Unaffected status matching the TL034CD. All devices are classified under ECCN EAR99 and HTSUS 8542.33.0001, ensuring equivalent regulatory compliance for procurement and deployment.

Q: What is the difference between the LF347D and LF347DT? A: Both devices are J-FET amplifiers manufactured by STMicroelectronics with identical electrical specifications (16 V/µs slew rate, 3-4 MHz gain bandwidth product, 20 pA input bias current). The primary difference is packaging format: LF347D is supplied in Tube packaging while LF347DT is supplied in Cut Tape & Digi-Reel format. The LF347DT has higher inventory availability (27,321 pieces versus 16,726 pieces). Both operate across 0°C to 70°C temperature range.

Q: Can the LM248DT be used as a substitute for the TL034CD? A: The LM248DT is a general purpose amplifier with 4-circuit configuration in 14-SOIC package. It differs from the TL034CD in amplifier type (general purpose versus J-FET), slew rate (0.5 V/µs versus 5.1 V/µs), and output current per channel (25 mA versus 40 mA). The LM248DT operates across ±22V supply rails and -40°C to 105°C temperature range. Selection is appropriate only when application requirements permit these performance differences.

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