TS27L4AIN CMOS Amplifier Equivalent & Substitute Parts

Part Overview

The TS27L4AIN is a CMOS amplifier integrated circuit manufactured by STMicroelectronics, configured as a 4-circuit operational amplifier in a 14-DIP package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The TS27L4AIN 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.

Key Parameters

Parameter	Value	Unit
Amplifier Type	CMOS	—
Number of Circuits	4	—
Slew Rate	0.04	V/µs
Gain Bandwidth Product	100	kHz
Current - Input Bias	1	pA
Voltage - Input Offset	900	µV
Current - Supply	10	µA (x4 Channels)
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-DIP (0.300", 7.62mm)	—
Mounting Type	Through Hole	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the TS27L4AIN is determined by strict compatibility across electrical and mechanical parameters. The following criteria establish valid substitute relationships:

Primary Compatibility Requirements:

Amplifier Type: CMOS
Number of Circuits: 4
Package / Case: 14-DIP (0.300", 7.62mm)
Mounting Type: Through Hole
Supply Voltage Range: Minimum 3V, Maximum 16V

Secondary Compatibility Parameters:

Slew Rate: 0.04 V/µs or higher
Gain Bandwidth Product: 100 kHz or higher
Current - Input Bias: 1 pA or lower
Current - Output / Channel: 30 mA or higher
Operating Temperature Range: Must encompass or overlap with -40°C to 125°C

Substitute parts are grouped into two categories based on performance characteristics:

Category 1 - Low-Speed CMOS Amplifiers (Slew Rate ≤ 0.05 V/µs): NJU7004D# operates at comparable speed with identical gain bandwidth product and maintains CMOS architecture with 4 circuits in 14-DIP package.

Category 2 - Higher-Performance CMOS/General Purpose Amplifiers (Slew Rate ≥ 0.032 V/µs, Gain Bandwidth Product ≥ 110 kHz): TLC1079CN, TLC1079IN, TLC274 series (ACN, AIN, BCN, BIN, CN), and TLC279CN provide enhanced performance characteristics while maintaining 14-DIP package compatibility and CMOS or general-purpose amplifier architecture.

Category 3 - High-Speed CMOS Amplifiers (Slew Rate ≥ 0.4 V/µs): NJU7024D# offers significantly higher slew rate and gain bandwidth product for applications requiring faster signal processing.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	Gain Bandwidth Product (kHz)	Input Bias Current (pA)	Input Offset Voltage (µV)	Supply Current (µA)	Output Current / Channel (mA)	Supply Voltage Min (V)	Supply Voltage Max (V)	Operating Temp (°C)	Product Status
TS27L4AIN	STMicroelectronics	CMOS	0.04	100	1	900	10	45	3	16	-40 to 125	Obsolete
NJU7004D#	Nisshinbo Micro Devices Inc.	CMOS	0.05	100	1	10000	15	—	1	16	-20 to 75	Active
NJU7024D#	Nisshinbo Micro Devices Inc.	CMOS	0.4	400	1	10000	150	—	3	16	-20 to 75	Active
TLC1079CN	Texas Instruments	CMOS	0.032	110	1	180	29	30	1.4	16	0 to 70	Last Time Buy
TLC1079IN	Texas Instruments	CMOS	0.032	110	1	180	29	30	3	16	-40 to 85	Last Time Buy
TLC274ACN	Texas Instruments	General Purpose	3.6	2200	0.6	900	2700	30	3	16	0 to 70	Last Time Buy
TLC274AIN	Texas Instruments	General Purpose	3.6	2200	0.6	900	2700	30	4	16	-40 to 85	Last Time Buy
TLC274BCN	Texas Instruments	General Purpose	3.6	2200	0.6	340	2700	30	3	16	0 to 70	Last Time Buy
TLC274BIN	Texas Instruments	General Purpose	3.6	2200	0.6	340	2700	30	4	16	-40 to 85	Last Time Buy
TLC274CN	Texas Instruments	General Purpose	3.6	2200	0.6	1100	2700	30	3	16	0 to 70	Last Time Buy
TLC279CN	Texas Instruments	CMOS	3.6	2200	0.6	320	2700	30	3	16	0 to 70	Last Time Buy

Engineering Selection Recommendations

For Direct Replacement in Low-Power Applications:

TLC1079IN is the preferred substitute when operating temperature range of -40°C to 85°C is acceptable. This device maintains CMOS architecture, achieves comparable gain bandwidth product of 110 kHz, and provides superior input offset voltage specification of 180 µV versus 900 µV of the TS27L4AIN. TLC1079IN carries ROHS3 compliance and Last Time Buy status from Texas Instruments, ensuring regulatory alignment with the original part.

For Extended Operating Temperature Coverage:

The TS27L4AIN operates to 125°C, which exceeds the maximum operating temperature of available CMOS substitutes. TLC1079IN extends to 85°C, representing a 40°C reduction in upper temperature limit. Applications requiring operation above 85°C require design review to determine if performance degradation is acceptable or if alternative architectures must be considered.

For Higher-Performance Requirements:

TLC274 series (ACN, AIN, BCN, BIN, CN) and TLC279CN provide significantly enhanced performance with slew rates of 3.6 V/µs and gain bandwidth products of 2.2 MHz. These devices are suitable for applications where the TS27L4AIN's 0.04 V/µs slew rate and 100 kHz bandwidth are limiting factors. All TLC274 variants maintain 14-DIP package compatibility and 16V maximum supply voltage. TLC274AIN and TLC274BIN support -40°C to 85°C operating range, matching the lower temperature limit of the TS27L4AIN.

For Active Product Status:

NJU7004D# and NJU7024D# from Nisshinbo Micro Devices Inc. maintain Active product status, providing long-term availability assurance. NJU7004D# operates at comparable speed to TS27L4AIN with 0.05 V/µs slew rate and 100 kHz gain bandwidth product. NJU7024D# offers higher performance with 0.4 V/µs slew rate and 400 kHz bandwidth for applications requiring faster response.

Compliance Considerations:

All substitute parts listed maintain ROHS3 compliance and REACH Unaffected status, matching the regulatory posture of the TS27L4AIN. Moisture Sensitivity Level 1 (Unlimited) is consistent across all candidates, eliminating moisture handling concerns during substitution.

Frequently Asked Questions (FAQ)

Q: Can NJU7004D# be used as a direct pin-for-pin replacement for TS27L4AIN?

A: NJU7004D# is mechanically compatible in 14-DIP package and electrically compatible for CMOS 4-circuit amplifier applications. However, the operating temperature range differs: NJU7004D# operates -20°C to 75°C versus TS27L4AIN's -40°C to 125°C. Applications operating below -20°C or above 75°C require alternative selection.

Q: What is the primary difference between TLC1079 and TLC274 series substitutes?

A: TLC1079 maintains CMOS amplifier architecture with slew rate of 0.032 V/µs and gain bandwidth product of 110 kHz, closely matching TS27L4AIN performance. TLC274 series are general-purpose amplifiers with significantly higher performance: 3.6 V/µs slew rate and 2.2 MHz gain bandwidth product. Selection depends on whether the application requires low-speed CMOS characteristics or can benefit from higher-speed operation.

Q: Are all substitute parts available in both commercial and industrial temperature grades?

A: Temperature grade availability varies by manufacturer and part number. TLC1079IN and TLC274AIN/BIN support industrial temperature range (-40°C to 85°C). TLC1079CN, TLC274ACN/BCN/CN, and TLC279CN support commercial temperature range (0°C to 70°C). NJU7004D# and NJU7024D# support -20°C to 75°C range. Verify specific temperature grade requirements before selection.

Q: Does the TS27L4AIN's 45 mA output current per channel affect substitute selection?

A: The TS27L4AIN specifies 45 mA output current per channel. Most substitute parts specify 30 mA output current per channel. Applications requiring output current exceeding 30 mA per channel must verify that the substitute part's output current specification is adequate. If 45 mA output current is critical, design review is necessary.

Q: What is the significance of "Last Time Buy" status for TLC1079 and TLC274 series?

A: Last Time Buy status indicates that Texas Instruments has announced end-of-life for these products. Customers may place final orders within a specified window before production ceases. For long-term production requirements, NJU7004D# or NJU7024D# with Active status provide extended availability assurance.

Q: Can TLC279CN be substituted for TS27L4AIN in all applications?

A: TLC279CN is a CMOS amplifier in 14-DIP package with 3.6 V/µs slew rate and 2.2 MHz gain bandwidth product, providing superior performance. However, operating temperature range is 0°C to 70°C, which does not cover the TS27L4AIN's -40°C to 125°C range. Substitution is valid only for applications operating within 0°C to 70°C.

Q: How does input offset voltage variation affect circuit design when substituting TS27L4AIN?

A: TS27L4AIN specifies 900 µV input offset voltage. Substitute parts vary: TLC1079 series specify 180 µV, TLC274 series specify 340 to 1100 µV, TLC279CN specifies 320 µV, and NJU7004D#/NJU7024D# specify 10 mV. Applications with tight DC accuracy requirements must account for these differences. Lower offset voltage (TLC1079 at 180 µV) provides superior DC precision.

Q: Is the 14-DIP package identical across all substitute parts?

A: All substitute parts use 14-DIP (0.300", 7.62mm) package with Through Hole mounting, ensuring mechanical compatibility with TS27L4AIN PCB layouts. Supplier device package designations vary (14-DIP versus 14-PDIP), but physical dimensions and pin spacing are identical.

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