TLC1078CD Equivalent & Substitute Parts

Part Overview

The TLC1078CD is a CMOS amplifier IC featuring 2 circuits in an 8-SOIC surface mount package, manufactured by Texas Instruments. This device operates across a supply voltage range of 1.4 V to 16 V with ultra-low input bias current (1 pA) and minimal input offset voltage (180 µV). The TLC1078CD is designated as Last Time Buy, indicating discontinued production status. Equivalent and substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production runs and legacy system support.

Key Parameters

Parameter	Value	Unit
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)	1.4	V
Voltage - Supply Span (Max)	16	V
Operating Temperature	0 to 70	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the TLC1078CD is determined by strict compatibility across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Amplifier Type: CMOS technology
Number of Circuits: 2 independent amplifier circuits
Package / Case: 8-SOIC form factor (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Supply Voltage Range: Minimum 1.4 V to Maximum 16 V overlap required
Input Bias Current: 1 pA (ultra-low specification)
Output Current per Channel: Minimum 30 mA capability

Secondary Compatibility Parameters:

Slew Rate: 0.032 V/µs or higher
Gain Bandwidth Product: 110 kHz or higher
Input Offset Voltage: Within acceptable tolerance for the application
Supply Current: Total current consumption across both channels
Operating Temperature Range: Must encompass 0°C to 70°C minimum

Substitute parts are grouped into two categories: Direct CMOS Equivalents (TS272 and TS27L2 series from STMicroelectronics) and Alternative Amplifier Technologies (OPA2186DR zero-drift and LM432MA general-purpose options). Direct CMOS equivalents maintain identical amplifier topology and input characteristics. Alternative technologies offer enhanced performance specifications but require application-level verification of compatibility.

Parameter Comparison

Parameter	TLC1078CD	TS272ACDT	TS272AIDT	TS272BIDT	TS272CDT	TS272IDT	TS27L2ACDT	TS27L2AIDT	TS27L2BIDT	OPA2186DR	LM432MA/NOPB
Amplifier Type	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	Zero-Drift	General Purpose
Number of Circuits	2	2	2	2	2	2	2	2	2	2	2
Slew Rate (V/µs)	0.032	5.5	5.5	5.5	5.5	5.5	0.04	0.04	0.04	0.35	—
Gain Bandwidth Product (kHz)	110	3500	3500	3500	3500	3500	100	100	100	750	1000
Current - Input Bias (pA)	1	1	1	1	1	1	1	1	1	50	3000
Voltage - Input Offset (µV)	180	900	900	250	1100	1100	900	1100	250	450	600
Current - Supply (µA, x2 Channels)	29	1000	1000	1000	1000	1000	10	10	10	90	150
Current - Output / Channel (mA)	30	45	45	45	45	45	45	45	45	20	30
Voltage - Supply Span Min (V)	1.4	3	3	3	3	3	3	3	3	4.5	2.5
Voltage - Supply Span Max (V)	16	16	16	16	16	16	16	16	16	24	16
Operating Temperature (°C)	0 to 70	0 to 70	-40 to 125	-40 to 125	0 to 70	-40 to 125	0 to 70	-40 to 125	-40 to 125	-40 to 125	-40 to 85
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active	Active	Active	Active	Active	Active	Active	Active	Obsolete

Engineering Selection Recommendations

Direct CMOS Substitutes (Recommended Primary Options):

The TS272 series (TS272ACDT, TS272AIDT, TS272BIDT, TS272CDT, TS272IDT) from STMicroelectronics provides direct functional equivalence to the TLC1078CD. All variants maintain CMOS amplifier topology, 2-circuit configuration, 8-SOIC packaging, and 1 pA input bias current specification. These parts are currently in Active product status with substantial inventory availability (1,457 to 25,400 units). The TS272 series exhibits higher slew rate (5.5 V/µs versus 0.032 V/µs) and gain bandwidth product (3.5 MHz versus 110 kHz), representing performance enhancement without functional incompatibility. Supply voltage range (3 V to 16 V) overlaps the TLC1078CD specification above 3 V. All TS272 variants are ROHS3 compliant with MSL 1 rating.

Selection within the TS272 series depends on operating temperature and packaging requirements:

TS272ACDT and TS272CDT: 0°C to 70°C operating range (matches TLC1078CD)
TS272AIDT and TS272IDT: -40°C to 125°C extended range
TS272BIDT: -40°C to 125°C with improved input offset voltage (250 µV)

Secondary CMOS Substitutes (Low-Power Alternative):

The TS27L2 series (TS27L2ACDT, TS27L2AIDT, TS27L2BIDT) provides ultra-low supply current consumption (10 µA versus 29 µA for TLC1078CD). These parts maintain identical CMOS topology, 1 pA input bias current, and 8-SOIC packaging. Slew rate (0.04 V/µs) and gain bandwidth product (100 kHz) closely match TLC1078CD specifications. TS27L2 variants are suitable for battery-powered and low-power applications where supply current minimization is critical. All variants are Active status with 3,120 to 10,400 units in stock.

Alternative Technology Options:

OPA2186DR (Texas Instruments, Zero-Drift Amplifier): Offers superior input offset voltage (450 µV) and extended operating temperature (-40°C to 125°C). This part is Active status with 2,642 units available. However, minimum supply voltage is 4.5 V (incompatible with TLC1078CD applications below 4.5 V) and input bias current is 50 pA (50× higher than TLC1078CD). Output current per channel is 20 mA (below TLC1078CD specification of 30 mA).

LM432MA/NOPB (Texas Instruments, General Purpose Amplifier): Designated Obsolete status. Input bias current is 3 nA (3,000× higher than TLC1078CD). This part is not recommended for new designs requiring ultra-low input bias current specifications.

Compliance and Certification:

All recommended substitute parts (TS272 and TS27L2 series) maintain ROHS3 compliance, MSL 1 rating, and REACH unaffected status, matching the TLC1078CD certification profile. ECCN and HTSUS classifications are identical across all parts.

Frequently Asked Questions (FAQ)

Q1: Can TS272 series parts directly replace TLC1078CD in existing designs?

A: TS272 series parts are functionally compatible with TLC1078CD in applications where supply voltage is 3 V or higher. Both maintain CMOS amplifier topology, 2-circuit configuration, 8-SOIC packaging, and 1 pA input bias current. The primary difference is higher performance (slew rate and bandwidth), which does not create incompatibility. Applications operating below 3 V supply voltage require TS27L2 series evaluation or alternative solutions.

Q2: What is the key difference between TS272ACDT and TS272AIDT?

A: Both parts are identical except for operating temperature range. TS272ACDT operates 0°C to 70°C (matching TLC1078CD), while TS272AIDT extends to -40°C to 125°C. Select TS272AIDT for applications requiring extended temperature operation.

Q3: Why does TS272BIDT have lower input offset voltage (250 µV) compared to other TS272 variants?

A: TS272BIDT represents a higher-grade selection within the TS272 family with tighter input offset voltage specification. This variant is suitable for precision analog applications where input offset voltage minimization is required.

Q4: Is OPA2186DR suitable as a TLC1078CD replacement?

A: OPA2186DR is not recommended as a direct replacement. While it offers superior input offset voltage and extended temperature range, the minimum supply voltage of 4.5 V creates incompatibility with TLC1078CD applications operating at 1.4 V to 4.5 V. Additionally, input bias current (50 pA) is 50× higher than TLC1078CD specification. OPA2186DR is suitable only for applications where 4.5 V minimum supply voltage is acceptable and higher input bias current is tolerable.

Q5: Can LM432MA/NOPB be used as a substitute?

A: LM432MA/NOPB is designated Obsolete and is not recommended for new designs. Input bias current specification (3 nA) is 3,000× higher than TLC1078CD, making it unsuitable for applications requiring ultra-low input bias current. Existing inventory should be reserved for legacy system maintenance only.

Q6: What is the impact of higher slew rate in TS272 series compared to TLC1078CD?

A: TS272 series slew rate (5.5 V/µs) is approximately 170× higher than TLC1078CD (0.032 V/µs). This enhancement improves transient response and signal fidelity in high-frequency applications. No negative impact occurs in applications designed for TLC1078CD slew rate; the higher specification provides additional performance margin.

Q7: Are all substitute parts available in the same packaging options as TLC1078CD?

A: All recommended substitute parts (TS272 and TS27L2 series) are available in 8-SOIC surface mount package matching TLC1078CD. Packaging variants differ in tape format (Cut Tape, Digi-Reel, or Tape & Reel) but do not affect electrical compatibility or PCB footprint.

Q8: Which substitute part is recommended for ultra-low power applications?

A: TS27L2 series (TS27L2ACDT, TS27L2AIDT, TS27L2BIDT) is recommended for power-constrained applications. Supply current consumption is 10 µA (x2 channels) compared to 29 µA for TLC1078CD, representing 66% reduction. TS27L2 series maintains identical CMOS topology and 1 pA input bias current specification.

Q9: What is the minimum supply voltage for TS272 and TS27L2 series?

A: Both TS272 and TS27L2 series require minimum 3 V supply voltage. TLC1078CD operates at 1.4 V minimum. Applications requiring operation below 3 V must retain TLC1078CD or evaluate alternative amplifier families not listed in this substitution guide.

Q10: Are there any PCB layout considerations when substituting TLC1078CD with TS272 or TS27L2 series?

A: No PCB layout modifications are required. All substitute parts maintain identical 8-SOIC pinout and footprint as TLC1078CD. Existing PCB designs require no physical changes for component substitution.

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