TLC1079CDR CMOS Amplifier Equivalent & Substitute Parts

Part Overview

The TLC1079CDR is a CMOS amplifier integrated circuit manufactured by Texas Instruments, configured as a 4-circuit operational amplifier in a 14-SOIC surface mount package. This device is classified as Last Time Buy, indicating discontinued production status. The TLC1079CDR operates across a wide supply voltage range of 1.4 V to 16 V and is suitable for low-power applications requiring CMOS amplification stages.

Due to the Last Time Buy status of the TLC1079CDR, equivalent and substitute parts from active product lines are necessary for ongoing design support and procurement continuity. Substitute devices must maintain functional compatibility through matching amplifier type, circuit count, package form factor, and critical electrical parameters.

Key Parameters

Parameter	Value	Unit
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
Slew Rate	0.032	V/µs
Gain Bandwidth Product	110	kHz
Current - Input Bias	1	pA
Voltage - Input Offset	180	µV
Current - Supply	29	µA (x4 Channels)
Current - Output / Channel	30	mA
Operating Temperature	0 to 70	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the TLC1079CDR is determined by strict adherence to the following critical parameters:

Mandatory Matching Parameters:

Amplifier Type: CMOS
Number of Circuits: 4
Package / Case: 14-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Voltage - Supply Span: Minimum 1.4 V to Maximum 16 V (substitute must support this range or a subset that includes the application voltage)

Functional Compatibility Parameters:

Current - Input Bias: 1 pA (all substitutes match)
Current - Output / Channel: Must support minimum 30 mA
Slew Rate: 0.032 V/µs or greater
Gain Bandwidth Product: 110 kHz or greater

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

Category 1 - Direct Performance Match (TS27L4 Series): TS27L4AIDT, TS27L4CDT, and TS27L4IDT maintain electrical performance closely aligned with the TLC1079CDR while offering active product status and extended temperature range options.

Category 2 - Enhanced Performance (TS27M4 Series): TS27M4CDT and TS27M4IDT provide higher slew rate (0.6 V/µs) and gain bandwidth product (1 MHz), suitable for applications requiring faster signal processing while maintaining 4-circuit CMOS configuration and 14-SOIC packaging.

All substitute parts are ROHS3 compliant, MSL 1 rated, and available in active production status.

Parameter Comparison

Parameter	TLC1079CDR	TS27L4AIDT	TS27L4CDT	TS27L4IDT	TS27M4CDT	TS27M4IDT
Manufacturer	Texas Instruments	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Amplifier Type	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
Number of Circuits	4	4	4	4	4	4
Package / Case	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
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
Slew Rate	0.032 V/µs	0.04 V/µs	0.04 V/µs	0.04 V/µs	0.6 V/µs	0.6 V/µs
Gain Bandwidth Product	110 kHz	100 kHz	100 kHz	100 kHz	1 MHz	1 MHz
Current - Input Bias	1 pA	1 pA	1 pA	1 pA	1 pA	1 pA
Voltage - Input Offset	180 µV	900 µV	1.1 mV	1.1 mV	1.1 mV	1.1 mV
Current - Supply	29 µA (x4)	10 µA (x4)	10 µA (x4)	10 µA (x4)	150 µA (x4)	150 µA (x4)
Current - Output / Channel	30 mA	45 mA	45 mA	45 mA	45 mA	45 mA
Operating Temperature	0 to 70°C	-40 to 125°C	0 to 70°C	-40 to 125°C	0 to 70°C	-40 to 125°C
Product Status	Last Time Buy	Active	Active	Active	Active	Active
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

For Direct Replacement with Matched Operating Temperature (0°C to 70°C):

TS27L4CDT and TS27M4CDT are suitable direct replacements when operating temperature range matches the TLC1079CDR specification. Both devices maintain ROHS3 compliance and MSL 1 rating. TS27L4CDT provides performance characteristics closely aligned with the original device, while TS27M4CDT offers enhanced bandwidth and slew rate for applications requiring faster transient response.

For Extended Temperature Range Applications (-40°C to 125°C):

TS27L4AIDT and TS27L4IDT extend the operating temperature range beyond the TLC1079CDR specification. These devices are suitable for industrial and automotive applications requiring wider temperature operation. TS27M4IDT provides the same extended temperature capability with enhanced performance characteristics.

Supply Voltage Consideration:

All substitute parts specify a minimum supply voltage of 3 V, compared to the TLC1079CDR minimum of 1.4 V. Applications requiring operation below 3 V cannot use these substitutes. Designs operating at 3 V or above are fully compatible.

Power Consumption Trade-off:

TS27L4 series devices consume 10 µA total supply current, representing a 66% reduction compared to the TLC1079CDR at 29 µA. TS27M4 series devices consume 150 µA, suitable for applications where bandwidth performance takes priority over power consumption.

Packaging and Compliance:

All substitute parts are available in active production status with confirmed inventory levels. All devices maintain identical 14-SOIC package dimensions, ROHS3 compliance, and MSL 1 moisture sensitivity rating, ensuring direct PCB compatibility and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can TS27L4CDT be used as a direct pin-for-pin replacement for TLC1079CDR?

A: Yes. Both devices are configured as 4-circuit CMOS amplifiers in 14-SOIC packages with identical pinout. Electrical performance is compatible for applications operating at supply voltages of 3 V or above and within the 0°C to 70°C temperature range.

Q: What is the primary difference between TS27L4 and TS27M4 series substitutes?

A: The TS27L4 series maintains slew rate of 0.04 V/µs and gain bandwidth product of 100 kHz with 10 µA total supply current. The TS27M4 series provides enhanced performance with 0.6 V/µs slew rate and 1 MHz gain bandwidth product, but requires 150 µA total supply current. Selection depends on application bandwidth requirements and power budget constraints.

Q: Why do all substitute parts specify a minimum supply voltage of 3 V instead of 1.4 V?

A: The TS27L4 and TS27M4 device families are designed with a 3 V minimum supply specification. Applications requiring operation below 3 V cannot use these substitutes and must source alternative devices or continue with TLC1079CDR inventory while available.

Q: Are there temperature range limitations when substituting the TLC1079CDR?

A: TS27L4CDT and TS27M4CDT maintain the 0°C to 70°C operating range matching the TLC1079CDR. TS27L4AIDT, TS27L4IDT, and TS27M4IDT extend the range to -40°C to 125°C. Selection depends on application temperature requirements.

Q: Do all substitute parts maintain RoHS3 compliance?

A: Yes. All five substitute parts (TS27L4AIDT, TS27L4CDT, TS27L4IDT, TS27M4CDT, TS27M4IDT) are ROHS3 compliant with MSL 1 moisture sensitivity rating, matching the TLC1079CDR compliance profile.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging options?

A: Packaging format affects supply chain logistics and handling. TS27L4AIDT is available in Tape & Reel format. TS27L4CDT and TS27M4CDT are available in Cut Tape format. TS27L4IDT and TS27M4IDT are available in Cut Tape & Digi-Reel format. All formats are compatible with standard surface mount assembly processes.

Q: Can TS27M4 devices be used in applications designed for TLC1079CDR without circuit modifications?

A: TS27M4 devices are pin-compatible and functionally compatible. However, the enhanced slew rate (0.6 V/µs versus 0.032 V/µs) and bandwidth (1 MHz versus 110 kHz) may affect circuit behavior in applications with tight feedback compensation or noise-sensitive signal paths. Circuit validation is necessary for applications sensitive to amplifier frequency response characteristics.

Q: What inventory status should be considered when selecting a substitute?

A: TS27L4CDT offers the highest inventory availability at 30,200 pieces. TS27L4IDT provides 23,400 pieces. TS27M4IDT provides 7,910 pieces. TS27M4CDT provides 5,450 pieces. TS27L4AIDT provides 1,844 pieces. Inventory levels support long-term procurement planning for production volumes.

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