TLC279CDG4 Equivalent & Substitute Parts

Part Overview

The TLC279CDG4 is a CMOS linear amplifier integrated circuit containing four independent operational amplifier circuits in a 14-SOIC surface mount package. Manufactured by Texas Instruments, this component is classified as obsolete product status. The TLC279CDG4 operates across a supply voltage range of 3V to 16V with an operating temperature range of 0°C to 70°C, making it suitable for general-purpose analog signal conditioning applications.

Due to its obsolete status, locating new original inventory of the TLC279CDG4 becomes increasingly difficult. Equivalent and substitute parts are necessary to maintain design continuity, ensure production availability, and support long-term product support requirements. Substitute components must maintain electrical compatibility across critical parameters including supply voltage range, circuit count, output current capability, and package form factor.

Key Parameters

Parameter	Value	Unit
Amplifier Type	CMOS	—
Number of Circuits	4	—
Slew Rate	3.6	V/µs
Gain Bandwidth Product	2.2	MHz
Current - Input Bias	0.6	pA
Voltage - Input Offset	320	µV
Current - Supply (x4 Channels)	2.7	mA
Current - Output / Channel	30	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	16	V
Operating Temperature	0 to 70	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution logic for the TLC279CDG4 is based on strict electrical and mechanical compatibility across the following critical parameters:

Primary Compatibility Criteria:

Amplifier Type: CMOS technology
Number of Circuits: 4 independent operational amplifier circuits
Package / Case: 14-SOIC form factor with 0.154" (3.90mm) width
Mounting Type: Surface Mount
Supply Voltage Range: Minimum 3V, Maximum 16V
Output Current per Channel: Minimum 30 mA capability

Secondary Compatibility Considerations:

Slew Rate: 3.6 V/µs or higher
Gain Bandwidth Product: 2.2 MHz or higher
Input Bias Current: 0.6 pA or lower
Input Offset Voltage: 320 µV or lower
Total Supply Current: 2.7 mA (x4 Channels) or lower

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

Category 1 - Direct Electrical Equivalents (Texas Instruments TLC279 Series): TLC279CD and TLC279CDR maintain identical electrical specifications to the TLC279CDG4. These parts differ only in packaging format (Tube vs. Tape & Reel) and product status. Both are manufactured by Texas Instruments and share the same base product number TLC279.

Category 2 - Functional Equivalents with Performance Trade-offs (STMicroelectronics TS27 Series): TS27L4CDT, TS27L4AIDT, TS27L4IDT, TS27M4CDT, and TS27M4IDT are manufactured by STMicroelectronics and provide CMOS 4-circuit amplifier functionality in 14-SOIC packages. These parts maintain supply voltage compatibility (3V to 16V) and output current capability (45 mA per channel). However, they exhibit different performance characteristics in slew rate, gain bandwidth product, input bias current, and supply current consumption. Selection within this category depends on specific application requirements for speed and power consumption.

Parameter Comparison

Parameter	TLC279CDG4	TLC279CD	TLC279CDR	TS27L4CDT	TS27L4AIDT	TS27L4IDT	TS27M4CDT	TS27M4IDT
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Amplifier Type	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
Number of Circuits	4	4	4	4	4	4	4	4
Slew Rate (V/µs)	3.6	3.6	3.6	0.04	0.04	0.04	0.6	0.6
Gain Bandwidth Product (MHz)	2.2	2.2	2.2	0.1	0.1	0.1	1	1
Current - Input Bias (pA)	0.6	0.6	0.6	1	1	1	1	1
Voltage - Input Offset (µV)	320	320	320	1100	900	1100	1100	1100
Current - Supply (mA, x4 Channels)	2.7	2.7	2.7	0.01	0.01	0.01	0.15	0.15
Current - Output / Channel (mA)	30	30	30	45	45	45	45	45
Voltage - Supply Span (Min, V)	3	3	3	3	3	3	3	3
Voltage - Supply Span (Max, V)	16	16	16	16	16	16	16	16
Operating Temperature (°C)	0 to 70	0 to 70	0 to 70	0 to 70	-40 to 125	-40 to 125	0 to 70	-40 to 125
Package / Case	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
Product Status	Obsolete	Last Time Buy	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

TLC279CDR is the primary recommended substitute for the obsolete TLC279CDG4. Both components share identical electrical specifications including 3.6 V/µs slew rate, 2.2 MHz gain bandwidth product, 0.6 pA input bias current, and 320 µV input offset voltage. The TLC279CDR maintains active product status with 4926 pieces in current inventory, ensuring long-term availability. Packaging format differs (Tape & Reel vs. Dip Tube), but electrical and mechanical compatibility is complete. RoHS3 compliance and MSL 1 rating match the original specification.

TLC279CD serves as a secondary direct replacement option. This part is classified as Last Time Buy status with 1033 pieces available. Electrical specifications are identical to TLC279CDG4. Packaging is provided in Tube format, which may require reprocessing for automated assembly environments.

For Performance-Optimized Substitution (STMicroelectronics TS27 Series):

Selection within the STMicroelectronics TS27 family depends on application-specific requirements for operating temperature range, power consumption, and signal bandwidth:

TS27L4CDT and TS27L4AIDT are ultra-low power variants with 10 µA total supply current (x4 channels), compared to 2.7 mA for the TLC279CDG4. These parts operate at 100 kHz gain bandwidth product and 0.04 V/µs slew rate, suitable for battery-powered or low-power applications where signal bandwidth requirements do not exceed 100 kHz. TS27L4CDT operates across 0°C to 70°C temperature range matching the original part. TS27L4AIDT extends operating temperature to -40°C to 125°C. Input offset voltage increases to 900-1100 µV, requiring circuit-level offset compensation if precision below 320 µV is required.

TS27M4CDT and TS27M4IDT provide intermediate performance with 1 MHz gain bandwidth product and 0.6 V/µs slew rate. Supply current consumption is 150 µA (x4 channels), representing a 55-fold reduction compared to TLC279CDG4 while maintaining higher bandwidth than TS27L4 variants. TS27M4CDT operates 0°C to 70°C; TS27M4IDT extends to -40°C to 125°C. These variants suit applications requiring moderate bandwidth with power efficiency constraints.

TS27L4IDT combines ultra-low power operation (10 µA) with extended temperature range (-40°C to 125°C), providing maximum flexibility for industrial and automotive environments where temperature extremes are encountered.

All STMicroelectronics TS27 variants maintain 14-SOIC package compatibility, 3V to 16V supply voltage range, and 45 mA output current per channel, exceeding the 30 mA requirement of the original part.

Frequently Asked Questions (FAQ)

Q1: Can TLC279CDR directly replace TLC279CDG4 without circuit modification?

A: Yes. TLC279CDR provides complete electrical equivalence to TLC279CDG4. All critical parameters including slew rate (3.6 V/µs), gain bandwidth product (2.2 MHz), input bias current (0.6 pA), input offset voltage (320 µV), supply voltage range (3V to 16V), and output current (30 mA per channel) are identical. The only difference is packaging format: TLC279CDR is supplied in Tape & Reel format while TLC279CDG4 was supplied in Dip Tube. Both use 14-SOIC surface mount packages with identical pinout and electrical behavior.

Q2: What are the key differences between Texas Instruments TLC279 and STMicroelectronics TS27 series?

A: TLC279 and TS27 series differ in performance characteristics while maintaining functional compatibility. TLC279CDG4 operates at 3.6 V/µs slew rate and 2.2 MHz bandwidth with 2.7 mA total supply current. TS27L4 variants operate at 0.04 V/µs slew rate and 100 kHz bandwidth with only 10 µA supply current, suitable for low-power applications. TS27M4 variants provide intermediate performance at 0.6 V/µs slew rate and 1 MHz bandwidth with 150 µA supply current. Input offset voltage also increases in TS27 series (900-1100 µV vs. 320 µV). Selection depends on whether the application prioritizes bandwidth and precision (TLC279) or power efficiency (TS27L4/TS27M4).

Q3: Are all substitute parts RoHS3 compliant and MSL 1 rated?

A: Yes. All substitute parts listed—TLC279CD, TLC279CDR, TS27L4CDT, TS27L4AIDT, TS27L4IDT, TS27M4CDT, and TS27M4IDT—are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating. This ensures compatibility with modern manufacturing processes and long-term storage without moisture bake-out requirements.

Q4: Which substitute part has the highest current inventory availability?

A: TS27L4CDT has the highest inventory with 30,200 pieces in stock, followed by TS27L4IDT with 23,400 pieces. TLC279CDR has 4,926 pieces available. If immediate availability is critical, TS27L4CDT provides the largest supply buffer, though this part operates at reduced bandwidth (100 kHz vs. 2.2 MHz).

Q5: Can TS27L4 or TS27M4 parts be used in high-speed signal conditioning applications?

A: TS27L4 variants are not suitable for high-speed applications. With 100 kHz gain bandwidth product and 0.04 V/µs slew rate, these parts are limited to DC and very low-frequency signal conditioning. TS27M4 variants provide 1 MHz bandwidth and 0.6 V/µs slew rate, suitable for audio-frequency and moderate-speed applications. For applications requiring the full 2.2 MHz bandwidth of the original TLC279CDG4, TLC279CDR or TLC279CD must be selected.

Q6: What is the operating temperature range difference between substitute parts?

A: TLC279CDG4, TLC279CD, TLC279CDR, TS27L4CDT, and TS27M4CDT all operate across 0°C to 70°C. TS27L4AIDT, TS27L4IDT, and TS27M4IDT extend operating temperature to -40°C to 125°C, providing wider temperature coverage for industrial and automotive applications. Selection of extended-temperature variants is necessary only if the application environment requires operation below 0°C or above 70°C.

Q7: Is input offset voltage difference between TLC279 (320 µV) and TS27 series (900-1100 µV) significant?

A: Input offset voltage difference is significant for precision analog applications. The TLC279CDG4 specification of 320 µV is approximately 3 times lower than TS27 series specifications. Applications requiring input-referred precision below 1 mV should use TLC279CDR or TLC279CD. Applications with input signal ranges exceeding 100 mV or those incorporating external offset trimming can tolerate TS27 series offset voltage specifications.

Q8: Can substitute parts be mixed within a single design?

A: Yes, if the circuit design accommodates performance variations. Mixing TLC279CDR with TS27M4CDT in a four-amplifier application is permissible if different amplifier stages have different bandwidth requirements. However, mixing TS27L4 (100 kHz) with TS27M4 (1 MHz) or TLC279 (2.2 MHz) in the same signal chain may introduce unexpected phase relationships and frequency response characteristics. Consistent part selection within a functional block is recommended.

Q9: What packaging formats are available for substitute parts?

A: TLC279CD is supplied in Tube packaging. TLC279CDR is supplied in Tape & Reel (TR) format. TS27L4AIDT is supplied in Tape & Reel (TR) format. TS27L4CDT and TS27M4CDT are supplied in Cut Tape (CT) & Digi-Reel® format. TS27L4IDT and TS27M4IDT are supplied in Cut Tape (CT) format. All parts use 14-SOIC surface mount packages with identical mechanical dimensions (0.154" width, 3.90mm). Packaging format selection depends on assembly equipment compatibility and volume requirements.

Q10: Are there any REACH or ECCN restrictions on substitute parts?

A: All substitute parts carry REACH Unaffected status and ECCN EAR99 classification, identical to the original TLC279CDG4. No additional export or regulatory documentation is required for any substitute part listed.

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