TS27L4ID CMOS Amplifier Equivalent & Substitute Parts

Part Overview

The TS27L4ID is a CMOS amplifier integrated circuit manufactured by STMicroelectronics, configured as a 4-circuit operational amplifier in a 14-SOIC surface mount package. This device is classified as obsolete, indicating discontinued production and limited availability in the supply chain. The TS27L4ID operates across a wide supply voltage range of 3V to 16V with ultra-low input bias current of 1 pA and is suitable for low-power analog signal processing applications requiring minimal power consumption.

Due to its obsolete status, identifying equivalent and substitute parts is necessary to ensure design continuity, maintain production schedules, and secure long-term component availability. Substitute parts must maintain functional compatibility through matching package type, circuit count, and critical electrical parameters while accommodating minor variations in performance characteristics.

Key Parameters

Parameter	TS27L4ID Value	Unit
Amplifier Type	CMOS	—
Number of Circuits	4	—
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Slew Rate	0.04	V/µs
Gain Bandwidth Product	100	kHz
Current - Input Bias	1	pA
Voltage - Input Offset	1.1	mV
Current - Supply (x4 Channels)	10	µA
Current - Output / Channel	45	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	16	V
Operating Temperature	-40°C ~ 125°C	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution compatibility for the TS27L4ID is determined by the following critical parameters:

Primary Compatibility Criteria:

Package type: 14-SOIC surface mount configuration
Circuit count: 4 independent amplifier circuits
Amplifier classification: CMOS technology
Supply voltage range: Minimum 3V to maximum 16V overlap
Input bias current: Ultra-low pA range
Mounting type: Surface mount

Secondary Compatibility Considerations:

Slew rate: 0.04V/µs baseline (substitutes may vary between 0.032V/µs to 3.6V/µs depending on application requirements)
Gain bandwidth product: 100 kHz baseline (substitutes range from 110 kHz to 2.2 MHz)
Operating temperature range: -40°C to 125°C baseline (substitutes may have narrower ranges)
Current supply specifications: 10µA baseline (substitutes range from 29µA to 2.7mA)
Output current capability: 45 mA baseline (substitutes typically 30 mA)

Substitute parts are grouped into two functional categories: direct CMOS amplifier replacements (TLC1079 series) and general-purpose operational amplifier alternatives (TLC274 and TLC25L4 series). Direct CMOS replacements maintain the lowest power consumption profile, while general-purpose alternatives offer enhanced bandwidth and slew rate performance at the cost of increased supply current.

Parameter Comparison

Parameter	TS27L4ID	TLC1079CD	TLC1079CDR	TLC1079ID	TLC1079IDR	TLC25L4BCD	TLC25L4CD	TLC274ACD	TLC274ACDR	TLC274AIDR	TLC274BCD
Manufacturer	STMicroelectronics	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Amplifier Type	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	4	4	4	4	4	4	4	4	4	4	4
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Slew Rate (V/µs)	0.04	0.032	0.032	0.032	0.032	0.04	0.04	3.6	3.6	3.6	3.6
Gain Bandwidth Product (kHz)	100	110	110	110	110	110	110	2200	2200	2200	2200
Current - Input Bias (pA)	1	1	1	1	1	0.2	0.6	0.6	0.6	0.6	0.6
Voltage - Input Offset (mV)	1.1	0.18	0.18	0.18	0.18	0.34	1.1	0.9	0.9	0.9	0.34
Current - Supply (µA, x4 Channels)	10	29	29	29	29	2700	2700	2700	2700	2700	2700
Current - Output / Channel (mA)	45	30	30	30	30	—	—	30	30	30	30
Voltage - Supply Span Min (V)	3	1.4	1.4	3	3	1.4	1.4	3	3	4	3
Voltage - Supply Span Max (V)	16	16	16	16	16	16	16	16	16	16	16
Operating Temperature (°C)	-40 ~ 125	0 ~ 70	0 ~ 70	-40 ~ 85	-40 ~ 85	0 ~ 70	0 ~ 70	0 ~ 70	0 ~ 70	-40 ~ 85	0 ~ 70
Product Status	Obsolete	Active	Last Time Buy	Last Time Buy	Active	Last Time Buy	Last Time Buy	Obsolete	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Direct CMOS Replacements):

The TLC1079 series from Texas Instruments represents the closest functional equivalent to the TS27L4ID. The TLC1079IDR variant is recommended as the primary substitute due to its active product status, ensuring long-term availability and supply chain stability. This device maintains CMOS amplifier architecture with 4 circuits in 14-SOIC packaging and operates across the 3V to 16V supply range required by the TS27L4ID. The TLC1079IDR supports the extended operating temperature range of -40°C to 85°C, which accommodates the TS27L4ID's -40°C to 125°C specification for applications operating below 85°C.

The TLC1079CD and TLC1079CDR variants provide alternative packaging options (tube and tape & reel respectively) with identical electrical characteristics to the TLC1079IDR. The TLC1079CDR is designated as Last Time Buy, indicating limited future availability. The TLC1079CD operates across a narrower temperature range (0°C to 70°C) and reduced minimum supply voltage (1.4V), making it suitable only for applications within these constraints.

Secondary Substitutes (General-Purpose Amplifiers):

The TLC274ACDR and TLC274AIDR variants from Texas Instruments provide general-purpose operational amplifier functionality with enhanced performance characteristics. These devices feature significantly higher slew rate (3.6V/µs versus 0.04V/µs) and gain bandwidth product (2.2 MHz versus 100 kHz), making them suitable for applications requiring faster signal processing. The TLC274ACDR is active and available in tape & reel packaging, while the TLC274AIDR is active with cut tape and Digi-Reel packaging options. Both support the -40°C to 85°C operating temperature range.

The TLC25L4 series (TLC25L4BCD and TLC25L4CD) offers intermediate performance between the low-power CMOS TLC1079 and higher-performance TLC274 variants. These devices maintain the 0.04V/µs slew rate and 110 kHz gain bandwidth product of the TS27L4ID while providing single-ended output configuration. Both variants are designated Last Time Buy, indicating declining availability.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the TS27L4ID specifications. All devices are classified under HTSUS code 8542.33.0001 and ECCN EAR99, maintaining regulatory consistency with the original component.

Selection Criteria by Application:

For applications requiring minimal power consumption and direct functional replacement, select TLC1079IDR (active status) or TLC1079ID (extended temperature range to -40°C to 85°C). For applications requiring enhanced bandwidth and slew rate performance, select TLC274ACDR or TLC274AIDR. For applications with intermediate performance requirements and lower supply current constraints, select TLC25L4CD or TLC25L4BCD.

Frequently Asked Questions (FAQ)

Q: Can the TLC1079IDR directly replace the TS27L4ID without circuit modifications?

A: The TLC1079IDR is pin-compatible and functionally equivalent within the 14-SOIC package. Both devices feature 4 CMOS amplifier circuits with identical pinout. However, the TLC1079IDR exhibits lower input offset voltage (0.18 mV versus 1.1 mV) and slightly higher supply current (29 µA versus 10 µA). Applications sensitive to input offset voltage or power consumption should evaluate these differences. The TLC1079IDR operates across the 3V to 16V supply range required by the TS27L4ID.

Q: What is the difference between TLC1079CD, TLC1079CDR, TLC1079ID, and TLC1079IDR?

A: These variants represent different packaging and temperature specifications of the same TLC1079 base device. The suffix indicates packaging type: CD denotes tube packaging, CDR denotes tape & reel, ID denotes tube, and IDR denotes tape & reel. Temperature ranges differ: CD and CDR operate 0°C to 70°C, while ID and IDR operate -40°C to 85°C. The TLC1079IDR is recommended for new designs due to active product status and extended temperature range.

Q: Why do the TLC274 variants have significantly higher slew rate and bandwidth than the TS27L4ID?

A: The TLC274 series are general-purpose operational amplifiers designed for broader application requirements, whereas the TS27L4ID is optimized for low-power CMOS applications. The TLC274 achieves 3.6V/µs slew rate and 2.2 MHz bandwidth through different circuit topology and higher supply current consumption (2.7 mA versus 10 µA). Applications requiring faster signal processing can utilize TLC274 variants, but designs optimized for low power should select TLC1079 alternatives.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the TS27L4ID specifications. All devices are suitable for applications requiring RoHS compliance.

Q: What is the minimum supply voltage for each substitute part?

A: The TS27L4ID requires minimum 3V supply. TLC1079CD and TLC1079CDR operate at minimum 1.4V, while TLC1079ID and TLC1079IDR require minimum 3V. TLC25L4 variants operate at minimum 1.4V. TLC274ACD and TLC274BCD require minimum 3V, while TLC274ACDR requires minimum 3V and TLC274AIDR requires minimum 4V. Select substitutes based on your application's minimum supply voltage requirement.

Q: Which substitute part has the longest operating temperature range?

A: The TS27L4ID operates across -40°C to 125°C. Among substitutes, TLC1079ID and TLC1079IDR support -40°C to 85°C, and TLC274AIDR supports -40°C to 85°C. Applications requiring operation above 85°C must retain the original TS27L4ID or evaluate alternative component families.

Q: What is the inventory status of substitute parts?

A: TLC1079IDR has the highest inventory (7166 units), followed by TLC274ACDR (16291 units). TLC1079ID has 1018 units, TLC1079CDR has 887 units, and TLC1079CD has 851 units. TLC274AIDR has 4340 units. Parts designated Last Time Buy (TLC1079CDR, TLC1079ID, TLC25L4BCD, TLC25L4CD, TLC274ACD, TLC274BCD) have limited future availability and should be evaluated for long-term supply chain planning.

Q: Can I use TLC25L4 variants as substitutes for the TS27L4ID?

A: TLC25L4 variants (TLC25L4BCD and TLC25L4CD) are compatible in package and circuit count but feature single-ended output configuration and significantly higher supply current (2.7 mA versus 10 µA). These devices are designated Last Time Buy, indicating declining availability. Use TLC25L4 variants only if application requirements specifically demand single-ended output and higher power consumption is acceptable.

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