TLC1078MD CMOS Amplifier Equivalent & Substitute Parts

Part Overview

The TLC1078MD is a CMOS amplifier integrated circuit manufactured by Texas Instruments, configured as a dual-channel operational amplifier in an 8-SOIC surface mount package. This device is classified as obsolete, indicating discontinued production and limited availability in the original form. The TLC1078MD operates within a supply voltage range of 4V to 16V and is designed for low-power CMOS amplification applications requiring minimal input bias current and moderate bandwidth performance.

Due to its obsolete status, component sourcing for new designs or replacement applications necessitates identification of functionally equivalent substitute parts that maintain compatibility with existing circuit requirements while offering improved availability and potentially enhanced performance characteristics.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	TLC1078MD	—
Manufacturer	Texas Instruments	—
Amplifier Type	CMOS	—
Number of Circuits	2	—
Slew Rate	0.032	V/µs
Gain Bandwidth Product	110	kHz
Current - Input Bias	1	pA
Voltage - Input Offset	180	µV
Current - Supply (x2 Channels)	29	µA
Current - Output / Channel	30	mA
Voltage - Supply Span (Min)	4	V
Voltage - Supply Span (Max)	16	V
Operating Temperature Range	-55°C to 125°C	—
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Product Status	Obsolete	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the TLC1078MD is determined by the following critical parameters that must be maintained or exceeded in equivalent devices:

Primary Compatibility Criteria:

Package Type: 8-SOIC surface mount configuration (0.154", 3.90mm width) is mandatory for mechanical and electrical compatibility
Circuit Count: Dual-channel (2 circuits) configuration required
Amplifier Type: CMOS technology preferred to maintain input bias current characteristics below 10 pA
Supply Voltage Range: Minimum 4V to maximum 16V operation required
Input Bias Current: Must not exceed 1 pA to maintain low-power characteristics
Output Current Capability: Minimum 30 mA per channel required

Secondary Performance Parameters:

Slew rate, gain bandwidth product, and input offset voltage may vary within acceptable ranges for the application
Operating temperature range may be extended or narrowed depending on application requirements
Supply current consumption may be higher in active substitutes while maintaining overall system efficiency

The substitute parts listed below satisfy these primary compatibility criteria while offering active product status and improved availability compared to the obsolete TLC1078MD.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (kHz)	Input Bias (pA)	Input Offset (µV)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Status
TLC1078MD	Texas Instruments	CMOS	0.032	110	1	180	29	30	4	16	-55 to 125	Obsolete
LM432MA/NOPB	Texas Instruments	General Purpose	—	1000	3	600	150	30	2.5	16	-40 to 85	Obsolete
TS272ACDT	STMicroelectronics	CMOS	5.5	3500	1	900	1000	45	3	16	0 to 70	Active
TS272AIDT	STMicroelectronics	CMOS	5.5	3500	1	900	1000	45	3	16	-40 to 125	Active
TS272BIDT	STMicroelectronics	CMOS	5.5	3500	1	250	1000	45	3	16	-40 to 125	Active
TS272CDT	STMicroelectronics	CMOS	5.5	3500	1	1100	1000	45	3	16	0 to 70	Active
TS272IDT	STMicroelectronics	CMOS	5.5	3500	1	1100	1000	45	3	16	-40 to 125	Active
TS27L2ACDT	STMicroelectronics	CMOS	0.04	100	1	900	10	45	3	16	0 to 70	Active
TS27L2AIDT	STMicroelectronics	CMOS	0.04	100	1	1100	10	45	3	16	-40 to 125	Active
TS27L2BIDT	STMicroelectronics	CMOS	0.04	100	1	250	10	45	3	16	-40 to 125	Active
TS27L2CD	STMicroelectronics	CMOS	0.04	100	1	1100	10	45	3	16	0 to 70	Active

Engineering Selection Recommendations

Primary Substitute Recommendation: TS27L2 Series (STMicroelectronics)

The TS27L2 family represents the closest functional equivalent to the TLC1078MD. These devices maintain CMOS amplifier architecture with identical input bias current (1 pA), comparable slew rate (0.04 V/µs versus 0.032 V/µs), and matching gain bandwidth product (100 kHz). The TS27L2 series operates across the full 3V to 16V supply range, encompassing the TLC1078MD's 4V to 16V specification. Supply current consumption is reduced to 10 µA per channel compared to the original 29 µA, providing improved power efficiency. Output current capability is increased to 45 mA per channel, exceeding the original 30 mA specification.

Temperature Range Selection:

TS27L2AIDT, TS27L2BIDT, TS27L2CD: Extended temperature operation from -40°C to 125°C matches the original TLC1078MD temperature specification
TS27L2ACDT, TS27L2CD: Commercial temperature range (0°C to 70°C) suitable for non-extended applications

Input Offset Voltage Variants:

TS27L2BIDT: 250 µV offset (tightest specification)
TS27L2ACDT: 900 µV offset
TS27L2AIDT, TS27L2CD: 1.1 mV offset

Secondary Substitute Option: TS272 Series (STMicroelectronics)

The TS272 family offers enhanced performance with higher slew rate (5.5 V/µs) and gain bandwidth product (3.5 MHz). These devices are suitable for applications requiring improved dynamic response. Supply current increases to 1 mA per channel, and minimum supply voltage reduces to 3V. Temperature range variants include extended (-40°C to 125°C) and commercial (0°C to 70°C) options.

Compliance and Availability: All substitute parts maintain ROHS3 compliance, REACH unaffected status, and active product status with substantial inventory availability. The TS27L2 series provides the most direct functional replacement with minimal circuit redesign requirements.

Frequently Asked Questions (FAQ)

Q1: Can TS272 series parts directly replace TLC1078MD in existing circuits?

The TS272 series maintains 8-SOIC package compatibility and dual-channel CMOS configuration. However, the significantly higher slew rate (5.5 V/µs versus 0.032 V/µs) and gain bandwidth product (3.5 MHz versus 110 kHz) may alter circuit behavior in applications sensitive to frequency response. The increased supply current (1 mA versus 29 µA) requires verification of power supply capacity. Direct substitution is possible only after confirming that enhanced performance characteristics do not introduce instability or exceed design margins.

Q2: What is the significance of the TS27L2 series matching the original slew rate specification?

The TS27L2 series maintains slew rate characteristics (0.04 V/µs) nearly identical to the TLC1078MD (0.032 V/µs), ensuring predictable transient response in existing circuit designs. This parameter directly affects settling time and signal fidelity in precision analog applications. Matching slew rate minimizes the requirement for circuit redesign and validation.

Q3: How does the reduced minimum supply voltage (3V for TS27L2 versus 4V for TLC1078MD) affect compatibility?

The TS27L2 series operates at 3V minimum supply voltage, which is lower than the TLC1078MD's 4V minimum. This represents improved flexibility for battery-powered or low-voltage applications. Existing circuits designed for 4V to 16V operation remain fully compatible, as the TS27L2 operates across this entire range. No circuit modification is required.

Q4: Why do some TS27L2 variants specify different input offset voltages?

Input offset voltage variations (250 µV, 900 µV, 1.1 mV) reflect different manufacturing grades within the TS27L2 family. The TLC1078MD specifies 180 µV offset. For applications requiring offset voltage matching to the original specification, TS27L2BIDT (250 µV) provides the closest performance. Applications with less stringent offset requirements may use higher-grade variants without performance degradation.

Q5: Is the increased output current capability (45 mA for TS27L2 versus 30 mA for TLC1078MD) a concern?

Increased output current capability represents an enhancement that does not create compatibility issues. Existing circuits designed for 30 mA output current operate within the TS27L2's 45 mA specification. This additional headroom improves design margin and allows for higher load currents if future circuit modifications are required.

Q6: What packaging options are available for the TS27L2 series?

The TS27L2 series is available in multiple packaging formats: Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and Tube. All variants maintain the 8-SOIC (0.154", 3.90mm width) surface mount package. Selection depends on procurement volume and assembly process requirements. Tape & Reel packaging is standard for high-volume automated assembly; Cut Tape and Tube formats support lower-volume or manual assembly operations.

Q7: Are there temperature range considerations when selecting between TS27L2 variants?

The TS27L2 family offers two temperature grades: commercial (0°C to 70°C) and extended (-40°C to 125°C). The TLC1078MD specifies extended range (-55°C to 125°C). For applications requiring full extended temperature operation, select TS27L2AIDT, TS27L2BIDT, or TS27L2CD variants rated to -40°C to 125°C. Commercial-grade variants (TS27L2ACDT, TS27L2CD at 0°C to 70°C) are suitable for standard industrial and consumer applications.

Q8: Why is LM432MA/NOPB listed as a substitute despite being obsolete?

The LM432MA/NOPB is included in the substitute list based on the provided input data. However, its obsolete status and significantly different performance characteristics (3 nA input bias current, 1 MHz gain bandwidth product, 150 µA supply current) make it a less suitable replacement than the active TS27L2 series. This part is not recommended for new designs or replacement applications.

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