TL034CNSR Equivalent & Substitute Parts

Part Overview

The TL034CNSR is a J-FET input operational amplifier manufactured by Texas Instruments, configured as a 4-circuit integrated circuit in 14-SOIC surface mount packaging. This device is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The TL034CNSR is designed for applications requiring low input bias current and high input impedance characteristics inherent to J-FET amplifier topology. Due to its Last Time Buy status, identification of functionally equivalent substitute components is necessary for design continuity and long-term supply chain planning.

Key Parameters

Parameter	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	790	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 (0.209", 5.30mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the TL034CNSR is determined by the following critical parameters:

Primary Substitution Criteria:

Number of circuits: 4 (mandatory match)
Mounting type: Surface Mount (mandatory match)
Package family: 14-SOIC (mandatory match)
Output current per channel: 40 mA (mandatory match)
Supply voltage range compatibility: Minimum 10 V to Maximum 30 V overlap required

Secondary Compatibility Factors:

Amplifier type: J-FET topology preferred for input bias current characteristics
Slew rate: 5.1 V/µs or higher acceptable
Gain bandwidth product: 1.1 MHz or higher acceptable
Input bias current: 2 pA or lower preferred
Input offset voltage: 790 µV or lower preferred

Substitute parts are grouped into two categories: direct J-FET replacements maintaining identical amplifier topology, and general-purpose amplifier alternatives with compatible electrical and mechanical specifications. General-purpose substitutes exhibit higher input bias current and different slew rate characteristics but maintain functional compatibility within the specified supply voltage and output current parameters.

Parameter Comparison

Parameter	TL034CNSR	TL034CDR	LM124DT	LM224ADT	LM224D	LM224DR2G	LM224DT	LM248DT	LM2902AWYDT	LM2902D	LM2902DR2G
Amplifier Type	J-FET	J-FET	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	4	4	4	4	4	4	4	4	4	4	4
Slew Rate (V/µs)	5.1	5.1	0.4	0.4	0.4	—	0.4	0.5	0.4	0.5	—
Gain Bandwidth Product (MHz)	1.1	1.1	1.3	1.3	1.2	1	1.3	1.3	1.3	1.2	1
Current - Input Bias (pA/nA)	2 pA	2 pA	20 nA	20 nA	20 nA	90 nA	20 nA	30 nA	20 nA	20 nA	90 nA
Voltage - Input Offset (µV/mV)	790 µV	790 µV	2 mV	2 mV	2 mV	2 mV	2 mV	1 mV	2 mV	3 mV	2 mV
Current - Supply (µA/mA)	870 µA	870 µA	1.5 mA	1.5 mA	1.5 mA	—	1.5 mA	2.1 mA	1.5 mA	1.4 mA	—
Current - Output / Channel (mA)	40	40	40	40	40	40	40	25	40	30	40
Voltage - Supply Span Min (V)	10	10	3	3	3	3	3	44	3	3	3
Voltage - Supply Span Max (V)	30	30	30	30	30	32	30	44	30	26	32
Operating Temperature (°C)	0 to 70	0 to 70	-55 to 125	-40 to 105	-40 to 105	-25 to 85	-40 to 105	-40 to 105	-40 to 125	-40 to 125	-40 to 105
Package / Case	14-SOIC (0.209", 5.30mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)	14-SOIC (0.154", 3.90mm)
Product Status	Last Time Buy	Active	Active	Active	Active	Active	Active	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Identical Topology):

TL034CDR is the primary substitute for TL034CNSR. Both devices employ J-FET amplifier topology with identical electrical specifications: 5.1 V/µs slew rate, 1.1 MHz gain bandwidth product, 2 pA input bias current, and 790 µV input offset voltage. TL034CDR maintains Active product status with significantly higher inventory availability (18,823 units). The primary mechanical difference is package width: TL034CDR uses 14-SOIC (0.154", 3.90mm) versus TL034CNSR (0.209", 5.30mm). Both are ROHS3 compliant with identical supply voltage range (10 V to 30 V) and output current specifications (40 mA per channel). Packaging format differs (Cut Tape & Digi-Reel® versus Tape & Reel), but functional compatibility is complete.

Tier 2 - General-Purpose Substitutes (Compatible Electrical Parameters):

LM224ADT, LM224DT, LM224D, and LM224DR2G are general-purpose amplifiers with 4 circuits in 14-SOIC packaging. These devices maintain 40 mA output current per channel and supply voltage range compatibility (3 V to 30 V minimum, exceeding TL034CNSR requirements). Key differences include lower slew rate (0.4 V/µs versus 5.1 V/µs), higher input bias current (20 nA to 90 nA versus 2 pA), and higher input offset voltage (2 mV versus 790 µV). LM224ADT and LM224DT are manufactured by STMicroelectronics with Active status and high inventory (34,870 and 35,200 units respectively). LM224DR2G is manufactured by onsemi with 105,200 units available. These substitutes are suitable for applications where J-FET input characteristics are not critical and general-purpose amplifier performance is acceptable.

Tier 3 - Alternative Configurations:

LM124DT (STMicroelectronics) provides differential output configuration with 1.3 MHz gain bandwidth product and extended temperature range (-55°C to 125°C). LM248DT offers improved input offset voltage (1 mV) but reduced output current (25 mA per channel) and fixed supply voltage (44 V). LM2902AWYDT includes automotive qualification (AEC-Q100) with push-pull output configuration. LM2902DR2G provides high inventory (205,100 units) with Active status.

Not Recommended:

LM2902D (onsemi) is classified as Obsolete with RoHS non-compliant status. This device should not be selected for new designs despite available inventory (3,155 units).

Frequently Asked Questions (FAQ)

Q1: Can TL034CDR directly replace TL034CNSR in existing PCB layouts?

A: TL034CDR is electrically identical to TL034CNSR with identical pin configuration and functional specifications. However, the package width differs: TL034CDR uses 14-SOIC (0.154", 3.90mm) while TL034CNSR uses 14-SOIC (0.209", 5.30mm). PCB footprint verification is required before substitution. If the PCB footprint accommodates the narrower 3.90mm package, direct substitution is possible. If the existing footprint is designed for the 5.30mm width, layout modification is necessary.

Q2: What are the key differences between J-FET and general-purpose amplifier substitutes?

A: J-FET amplifiers (TL034CNSR, TL034CDR) feature extremely low input bias current (2 pA) and high input impedance, suitable for high-impedance signal sources and precision measurement applications. General-purpose amplifiers (LM224 series, LM2902 series) have higher input bias current (20 nA to 90 nA) and lower input impedance. Selection depends on application requirements: J-FET devices are necessary for high-impedance applications; general-purpose devices are acceptable for standard signal conditioning and buffering.

Q3: Are all substitute parts ROHS3 compliant?

A: All recommended substitutes except LM2902D are ROHS3 compliant. LM2902D is RoHS non-compliant and should not be used in applications requiring RoHS compliance. All other listed substitutes meet ROHS3 requirements.

Q4: What is the impact of different slew rates on circuit performance?

A: TL034CNSR and TL034CDR have 5.1 V/µs slew rate. General-purpose substitutes (LM224 series) have 0.4 V/µs slew rate. Slew rate determines the maximum rate of voltage change at the output. Applications requiring fast transient response or high-frequency signal processing benefit from higher slew rates. Applications with slower signal dynamics tolerate lower slew rates. Verify application bandwidth requirements before selecting lower slew rate substitutes.

Q5: Can LM248DT be used as a substitute despite lower output current?

A: LM248DT provides only 25 mA output current per channel versus 40 mA for TL034CNSR. Substitution is only acceptable if the application load current does not exceed 25 mA per channel. Additionally, LM248DT requires fixed 44 V supply voltage, incompatible with TL034CNSR's 10 V to 30 V range. LM248DT is not recommended as a general substitute.

Q6: What inventory considerations apply to substitute selection?

A: TL034CNSR has 1,425 units available with Last Time Buy status, indicating limited future availability. TL034CDR (18,823 units) provides immediate alternative with identical specifications. LM224DR2G (105,200 units) and LM2902DR2G (205,100 units) offer maximum inventory availability for general-purpose applications. For long-term supply chain planning, Tier 1 (TL034CDR) or high-inventory Tier 2 options (LM224DR2G, LM2902DR2G) are recommended.

Q7: Are there temperature range limitations with substitute parts?

A: TL034CNSR operates 0°C to 70°C. Most substitutes extend this range: LM224 series operates -40°C to 105°C, LM124DT operates -55°C to 125°C. If the application requires operation below 0°C or above 70°C, substitute parts with extended temperature ranges are necessary. LM2902D operates -40°C to 125°C but is Obsolete and RoHS non-compliant.

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