TS27M4IDT Equivalent & Substitute Parts

Part Overview

The TS27M4IDT is a CMOS amplifier integrated circuit manufactured by STMicroelectronics, containing four independent circuits in a 14-SOIC surface mount package. This device is classified as a linear amplifier and is currently in active product status. The TS27M4IDT operates across a wide supply voltage range of 3V to 16V and maintains performance across the industrial temperature range of -40°C to 125°C. Substitute parts are necessary when the TS27M4IDT becomes unavailable due to supply constraints, end-of-life transitions, or when design requirements necessitate alternative electrical characteristics or packaging configurations.

Key Parameters

Parameter	Value	Unit
Amplifier Type	CMOS	—
Number of Circuits	4	—
Slew Rate	0.6	V/µs
Gain Bandwidth Product	1	MHz
Current - Input Bias	1	pA
Voltage - Input Offset	1.1	mV
Current - Supply (x4 Channels)	150	µA
Current - Output / Channel	45	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	16	V
Operating Temperature	-40 to 125	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the TS27M4IDT is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Critical Parameters for Substitution:

Number of circuits: Must equal 4
Package type: Must be 14-SOIC (0.154", 3.90mm Width)
Mounting type: Must be Surface Mount
Supply voltage range: Minimum 3V, Maximum must accommodate 16V operation
Operating temperature range: Must include -40°C to 125°C or be compatible with the application's thermal requirements
Input bias current: CMOS devices (1 pA) are preferred for low-power applications; general-purpose amplifiers (20 nA) are acceptable where higher bias current is tolerable
Slew rate and gain bandwidth product: Must meet or exceed application timing requirements

Substitute parts are grouped into two categories: CMOS amplifiers with ultra-low input bias current (1 pA) and general-purpose amplifiers with higher input bias current (20 nA). CMOS substitutes maintain the low-power input characteristics of the TS27M4IDT. General-purpose substitutes offer higher output current capability and wider supply voltage ranges but consume more supply current and exhibit higher input bias current.

Parameter Comparison

Parameter	TS27M4IDT	TLC1079CD	TLC1079CDR	TLC1079ID	LM2902KAVQDR	LM2902KD	LM2902KDR	LM2902KVQDR	LM2902KVQDRG4	LM2902QDRG4Q1	LM2902QDRQ1
Manufacturer	STMicroelectronics	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Rohm Semiconductor	Rohm Semiconductor	Texas Instruments	Texas Instruments	Texas Instruments
Amplifier Type	CMOS	CMOS	CMOS	CMOS	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)	0.6	0.032	0.032	0.032	0.5	0.5	0.3	0.3	0.5	0.5	0.5
Gain Bandwidth Product (MHz)	1	0.11	0.11	0.11	1.2	1.2	0.7	1.2	1.2	1.2	1.2
Current - Input Bias (pA/nA)	1 pA	1 pA	1 pA	1 pA	20 nA	20 nA	20 nA	20 nA	20 nA	20 nA	20 nA
Voltage - Input Offset (mV/µV)	1.1 mV	0.18 mV	0.18 mV	0.18 mV	3 mV	3 mV	3 mV	3 mV	3 mV	3 mV	3 mV
Current - Supply (x4 Channels)	150 µA	29 µA	29 µA	29 µA	1.4 mA	1.4 mA	1.4 mA	1.4 mA	1.4 mA	1.4 mA	1.4 mA
Current - Output / Channel (mA)	45	30	30	30	30	30	30	30	30	60	60
Voltage - Supply Span (Min)	3 V	1.4 V	1.4 V	3 V	3 V	3 V	3 V	3 V	3 V	3 V	3 V
Voltage - Supply Span (Max)	16 V	16 V	16 V	16 V	30 V	26 V	26 V	26 V	30 V	26 V	26 V
Operating Temperature	-40 to 125°C	0 to 70°C	0 to 70°C	-40 to 85°C	-40 to 125°C	-40 to 125°C	-40 to 125°C	-40 to 125°C	-40 to 125°C	-40 to 125°C	-40 to 125°C
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOPJ	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
Product Status	Active	Active	Last Time Buy	Last Time Buy	Active	Last Time Buy	Obsolete	Obsolete	Last Time Buy	Last Time Buy	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

CMOS Amplifier Substitutes (Ultra-Low Input Bias Current)

The TLC1079 series devices (TLC1079CD, TLC1079CDR, TLC1079ID) maintain the CMOS architecture and 1 pA input bias current characteristic of the TS27M4IDT. These substitutes are suitable for applications requiring minimal input bias current and low supply current consumption. However, the TLC1079 series exhibits significantly lower slew rate (0.032 V/µs versus 0.6 V/µs) and lower gain bandwidth product (110 kHz versus 1 MHz), making them unsuitable for high-speed signal processing applications. The TLC1079CD and TLC1079CDR are limited to 0°C to 70°C operating temperature, which does not cover the full industrial temperature range of the TS27M4IDT. The TLC1079ID extends the operating temperature to -40°C to 85°C, providing closer alignment with the TS27M4IDT temperature range, though it does not reach 125°C. All TLC1079 variants are ROHS3 compliant with MSL 1 rating.

General-Purpose Amplifier Substitutes (Higher Input Bias Current)

The LM2902 series devices offer higher output current capability (30 mA to 60 mA per channel) and extended supply voltage ranges (up to 26V to 30V maximum). These general-purpose amplifiers are suitable for applications where higher input bias current (20 nA) is acceptable and where increased output drive capability is beneficial. The LM2902KAVQDR and LM2902QDRQ1 are in active product status and support the full -40°C to 125°C operating temperature range with ROHS3 compliance and AEC-Q100 automotive qualification. The LM2902QDRG4Q1 and LM2902QDRQ1 provide 60 mA output current per channel, exceeding the TS27M4IDT specification. The LM2902KD, LM2902KDR, and LM2902KVQDRG4 are designated as Last Time Buy, indicating limited future availability. The LM2902KDR is obsolete and should be avoided for new designs.

Recommended Primary Substitutes:

For applications requiring CMOS characteristics and ultra-low input bias current: TLC1079ID (supports -40°C to 85°C; verify application temperature requirements below 125°C).

For applications tolerating higher input bias current with enhanced output drive: LM2902QDRQ1 (active status, full temperature range -40°C to 125°C, AEC-Q100 qualified, 60 mA output current).

For applications requiring immediate availability with active product status: LM2902KAVQDR (active status, AEC-Q100 qualified, full temperature range).

Frequently Asked Questions (FAQ)

Q: Can the TLC1079 series directly replace the TS27M4IDT in all applications?

A: The TLC1079 series maintains CMOS architecture and 1 pA input bias current but exhibits significantly reduced slew rate (0.032 V/µs versus 0.6 V/µs) and gain bandwidth product (110 kHz versus 1 MHz). Direct replacement is limited to low-frequency applications. Additionally, TLC1079CD and TLC1079CDR operate only to 70°C, which does not cover the full industrial temperature range. TLC1079ID extends to 85°C but does not reach 125°C. Verify application frequency response and temperature requirements before substitution.

Q: What is the difference between CMOS and general-purpose amplifier substitutes?

A: CMOS amplifiers (TS27M4IDT, TLC1079 series) feature ultra-low input bias current (1 pA) and lower supply current consumption, making them suitable for high-impedance input applications and battery-powered systems. General-purpose amplifiers (LM2902 series) exhibit higher input bias current (20 nA) and higher supply current but offer greater output drive capability (up to 60 mA per channel) and extended supply voltage ranges. Selection depends on application requirements for input impedance, power consumption, and output current.

Q: Are the LM2902 series devices compatible with the TS27M4IDT pinout?

A: Yes, all substitute parts listed maintain the 14-SOIC package with identical pinout. However, LM2902KVQDR uses a 14-SOPJ package variant. Verify PCB footprint compatibility before substitution. All other LM2902 variants use standard 14-SOIC packaging compatible with TS27M4IDT.

Q: Which substitute parts are recommended for new designs?

A: For new designs, select from parts with active product status: TS27M4IDT (original part, active), LM2902KAVQDR (active, AEC-Q100 qualified), and LM2902QDRQ1 (active, AEC-Q100 qualified). Avoid parts designated as Last Time Buy or Obsolete for new designs, as these have limited future availability.

Q: What is the impact of higher input bias current in LM2902 substitutes?

A: The LM2902 series exhibits 20 nA input bias current compared to 1 pA in the TS27M4IDT. This 20,000-fold increase affects applications with very high input impedance (>1 GΩ) or precision DC coupling. For typical signal conditioning and audio applications, the difference is negligible. Verify input impedance requirements and DC offset specifications before substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the TS27M4IDT compliance status.

Q: What is the significance of AEC-Q100 qualification on LM2902 variants?

A: AEC-Q100 qualification indicates automotive-grade reliability testing and is present on LM2902KAVQDR, LM2902QDRG4Q1, and LM2902QDRQ1. This qualification is not required for industrial applications but indicates higher reliability standards. Non-qualified parts (TLC1079 series) are suitable for industrial applications within their specified operating ranges.

Q: Can TLC1079CD or TLC1079CDR be used in applications requiring -40°C to 125°C operation?

A: No. TLC1079CD and TLC1079CDR are limited to 0°C to 70°C operating temperature. TLC1079ID extends to -40°C to 85°C but does not reach 125°C. For full -40°C to 125°C coverage, use LM2902 series substitutes (LM2902KAVQDR, LM2902QDRQ1, or LM2902QDRG4).

Q: What is the difference between LM2902QDRG4Q1 and LM2902QDRQ1?

A: Both devices are AEC-Q100 qualified general-purpose amplifiers with identical electrical specifications. LM2902QDRG4Q1 is designated Last Time Buy with 2,900 units in stock. LM2902QDRQ1 is in active product status with 7,178 units in stock. For new designs, LM2902QDRQ1 is preferred due to active status and higher availability.

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