TLC25L4CD CMOS Amplifier Equivalent & Substitute Parts

Part Overview

The TLC25L4CD is a CMOS amplifier integrated circuit manufactured by Texas Instruments, configured as a 4-circuit single-ended amplifier in a 14-SOIC surface mount package. This device operates across a wide supply voltage range of 1.4 V to 16 V and is designed for low-power analog signal processing applications. The TLC25L4CD currently holds Last Time Buy status, indicating that Texas Instruments has discontinued active production. This status necessitates identification of equivalent and substitute parts to ensure design continuity and procurement availability for ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Amplifier Type	CMOS	—
Number of Circuits	4	—
Output Type	Single-Ended	—
Slew Rate	0.04	V/µs
Gain Bandwidth Product	110	kHz
Current - Input Bias	0.6	pA
Voltage - Input Offset	1.1	mV
Current - Supply (x4 Channels)	2.7	mA
Voltage - Supply Span (Min)	1.4	V
Voltage - Supply Span (Max)	16	V
Operating Temperature Range	0 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 eligibility for the TLC25L4CD is determined by the following critical parameters:

Primary Compatibility Criteria:

Amplifier Type: CMOS
Number of Circuits: 4
Package / Case: 14-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Voltage - Supply Span (Min): ≥ 1.4 V
Voltage - Supply Span (Max): ≥ 16 V
Operating Temperature Range: Must encompass 0°C to 70°C minimum

Substitution Logic:

The TLC25L4CD operates at low slew rate (0.04 V/µs) and low gain bandwidth product (110 kHz), characteristic of precision, low-power CMOS amplifier designs. Substitute parts must maintain the same 4-circuit CMOS architecture and 14-SOIC package footprint to ensure direct pin-compatible replacement without PCB redesign.

The identified substitute parts fall into two functional categories:

Category 1 - Direct Functional Equivalents (TLC Series): TLC27L4CDR maintains the LinCMOS™ series lineage with identical circuit count, package, and supply voltage range. This part is the manufacturer-recommended primary substitute.

Category 2 - Enhanced Performance Alternatives (TS274 Series): TS274IDT, TS274CDT, TS274ACDT, and TS274AIDT are STMicroelectronics CMOS 4-circuit amplifiers in 14-SOIC packages. These parts offer significantly higher slew rate (5.5 V/µs) and gain bandwidth product (3.5 MHz), suitable for applications requiring faster signal processing while maintaining the same package and circuit count.

All substitute parts are RoHS3 compliant, MSL Level 1, and support the full 3 V to 16 V supply voltage range required for compatibility.

Parameter Comparison

Parameter	TLC25L4CD	TLC27L4CDR	TS274IDT	TS274CDT	TS274ACDT	TS274AIDT
Manufacturer	Texas Instruments	Texas Instruments	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Product Status	Last Time Buy	Active	Active	Active	Active	Active
Amplifier Type	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
Number of Circuits	4	4	4	4	4	4
Slew Rate (V/µs)	0.04	0.05	5.5	5.5	5.5	5.5
Gain Bandwidth Product (kHz)	110	110	3500	3500	3500	3500
Current - Input Bias (pA)	0.6	0.7	1	1	1	1
Voltage - Input Offset (mV)	1.1	1.1	1.1	1.1	0.9	0.9
Current - Supply (mA)	2.7	0.057	1	1	1	1
Voltage - Supply Span (Min)	1.4 V	3 V	3 V	3 V	3 V	3 V
Voltage - Supply Span (Max)	16 V	16 V	16 V	16 V	16 V	16 V
Operating Temperature (°C)	0 to 70	0 to 70	-40 to 125	0 to 70	0 to 70	-40 to 125
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute - TLC27L4CDR:

TLC27L4CDR is the manufacturer-recommended substitute and represents the optimal choice for direct replacement of TLC25L4CD in existing designs. Both devices are part of the Texas Instruments LinCMOS™ series and maintain identical gain bandwidth product (110 kHz) and input offset voltage (1.1 mV). The TLC27L4CDR is currently in Active production status with substantial inventory availability (30,100 pieces). This part operates within the same performance envelope as the original TLC25L4CD, ensuring no circuit redesign is required. The primary difference is reduced supply current (57 µA vs. 2.7 mA), which provides improved power efficiency. The minimum supply voltage requirement increases from 1.4 V to 3 V; designs operating below 3 V cannot use this substitute.

Secondary Substitutes - TS274 Series (STMicroelectronics):

The TS274IDT, TS274CDT, TS274ACDT, and TS274AIDT are functionally compatible alternatives that provide significantly enhanced performance characteristics. These parts feature 31.8× higher slew rate (5.5 V/µs vs. 0.04 V/µs) and 31.8× higher gain bandwidth product (3.5 MHz vs. 110 kHz). All TS274 variants maintain the 4-circuit CMOS architecture and 14-SOIC package footprint, enabling direct pin-compatible substitution.

Selection among TS274 variants depends on operating temperature and packaging requirements:

TS274IDT: Extended temperature range (-40°C to 125°C), Tape & Reel packaging
TS274AIDT: Extended temperature range (-40°C to 125°C), Cut Tape & Digi-Reel packaging
TS274CDT: Standard temperature range (0°C to 70°C), Cut Tape & Digi-Reel packaging
TS274ACDT: Standard temperature range (0°C to 70°C), Cut Tape packaging

TS274 substitution is appropriate for designs where higher bandwidth and slew rate provide functional benefits. However, the increased performance may introduce different noise characteristics or require circuit optimization. All TS274 variants are RoHS3 compliant and MSL Level 1.

Compliance and Certification:

All identified substitute parts maintain RoHS3 compliance, REACH unaffected status, and MSL Level 1 moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols. ECCN classification (EAR99) and HTSUS code (8542.33.0001) remain consistent across all parts.

Frequently Asked Questions (FAQ)

Q1: Can TLC27L4CDR be used as a direct replacement for TLC25L4CD without circuit modifications?

A: TLC27L4CDR is pin-compatible and functionally equivalent for most applications. However, the minimum supply voltage increases from 1.4 V to 3 V. If your design operates below 3 V, this substitute is not suitable. For designs operating at 3 V or higher, no circuit modifications are required. The reduced supply current (57 µA vs. 2.7 mA) is a beneficial change that improves power efficiency.

Q2: What is the primary difference between TLC27L4CDR and TS274 series substitutes?

A: TLC27L4CDR maintains the original performance characteristics (110 kHz bandwidth, 0.05 V/µs slew rate) and is the direct functional equivalent. TS274 series parts offer significantly higher performance (3.5 MHz bandwidth, 5.5 V/µs slew rate) suitable for faster signal processing applications. The choice depends on whether your circuit requires the original low-bandwidth characteristics or can benefit from enhanced performance.

Q3: Are all substitute parts available in the same 14-SOIC package?

A: Yes. All identified substitute parts use the 14-SOIC (0.154", 3.90mm Width) package, ensuring identical PCB footprint and pin compatibility. Packaging format differs (Tube, Cut Tape, Tape & Reel, Digi-Reel), but the physical component package remains consistent.

Q4: Which substitute should I select if my application requires extended temperature operation?

A: TS274IDT and TS274AIDT support extended operating temperature range (-40°C to 125°C) compared to the original TLC25L4CD (0°C to 70°C). If your design requires operation below 0°C or above 70°C, these parts are the appropriate choice. TLC27L4CDR and TS274CDT/TS274ACDT maintain the standard 0°C to 70°C range.

Q5: What is the impact of increased slew rate in TS274 substitutes on circuit behavior?

A: The TS274 series provides 137.5× faster slew rate (5.5 V/µs vs. 0.04 V/µs). This enables faster signal transitions and higher bandwidth operation. In applications designed for the original low-bandwidth characteristics, the increased slew rate may introduce different transient response or noise behavior. Circuit validation is necessary if substituting TS274 parts into designs optimized for the TLC25L4CD's low-bandwidth performance.

Q6: Are there supply voltage compatibility concerns when substituting parts?

A: Yes. TLC25L4CD operates from 1.4 V minimum; TLC27L4CDR and all TS274 variants require 3 V minimum. Designs operating at 1.4 V to 2.9 V cannot use any of the identified substitutes. For designs operating at 3 V or higher, all substitutes are compatible with the maximum 16 V supply voltage limit.

Q7: How do input bias current specifications compare across substitute options?

A: TLC25L4CD specifies 0.6 pA input bias current. TLC27L4CDR increases this to 0.7 pA (16.7% higher). TS274 series parts specify 1 pA (66.7% higher). For precision analog circuits with high-impedance inputs, this difference may be significant. Verify that your circuit design accommodates the higher input bias current of substitute parts.

Q8: What packaging format should I specify for production procurement?

A: Packaging format depends on your manufacturing process. Cut Tape (CT) and Digi-Reel® formats are suitable for automated pick-and-place assembly. Tape & Reel (TR) format is standard for high-volume production. Tube packaging is used for lower-volume or manual assembly. All formats contain the same 14-SOIC component; the choice affects handling and assembly logistics only.

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