THS4042CDG4 Equivalent & Substitute Parts

Part Overview

The THS4042CDG4 is a voltage feedback amplifier integrated circuit manufactured by Texas Instruments, configured as a dual-channel (2 circuit) device in an 8-SOIC surface mount package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and production continuity. The THS4042CDG4 operates across a wide supply voltage range and delivers high slew rate performance suitable for signal conditioning and amplification applications.

Key Parameters

Parameter	Value
Amplifier Type	Voltage Feedback
Number of Circuits	2
Slew Rate	400 V/µs
-3dB Bandwidth	165 MHz
Current - Input Bias	2.5 µA
Voltage - Input Offset	2.5 mV
Current - Supply	8 mA (x2 Channels)
Current - Output / Channel	100 mA
Voltage - Supply Span (Min)	9 V
Voltage - Supply Span (Max)	32 V
Operating Temperature	0°C ~ 70°C
Package / Case	8-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 of the THS4042CDG4 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: Voltage Feedback
Number of Circuits: 2
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Operating Temperature Range: 0°C ~ 70°C
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Compatibility Parameters:

Slew Rate: 400 V/µs (minimum requirement)
Voltage - Supply Span: 9 V to 32 V (operating range)
Current - Output / Channel: 100 mA (minimum requirement)

The THS4042CD is a direct Texas Instruments equivalent with identical electrical specifications and active product status. The LT1355CS8 series (Analog Devices Inc.) represents an alternative manufacturer solution with the same package and dual-channel configuration. While the LT1355 exhibits different input bias current (80 nA vs. 2.5 µA) and input offset voltage (300 µV vs. 2.5 mV), it maintains compatibility across supply voltage range, slew rate, and output current specifications. Packaging variants (tube, cut tape, digi-reel) of the LT1355CS8 are functionally equivalent and differ only in distribution format.

Parameter Comparison

Parameter	THS4042CDG4	THS4042CD	LT1355CS8	LT1355CS8#PBF	LT1355CS8#TR	LT1355CS8#TRPBF
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active
Amplifier Type	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback	Voltage Feedback
Number of Circuits	2	2	2	2	2	2
Slew Rate	400 V/µs	400 V/µs	400 V/µs	400 V/µs	400 V/µs	400 V/µs
Current - Input Bias	2.5 µA	2.5 µA	80 nA	80 nA	80 nA	80 nA
Voltage - Input Offset	2.5 mV	2.5 mV	300 µV	300 µV	300 µV	300 µV
Current - Supply	8 mA (x2 Channels)	8 mA (x2 Channels)	1 mA (x2 Channels)	1 mA (x2 Channels)	1 mA (x2 Channels)	1 mA (x2 Channels)
Current - Output / Channel	100 mA	100 mA	30 mA	30 mA	30 mA	30 mA
Voltage - Supply Span (Min)	9 V	9 V	5 V	5 V	5 V	5 V
Voltage - Supply Span (Max)	32 V	32 V	30 V	30 V	30 V	30 V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: THS4042CD

The THS4042CD is the preferred substitute for the obsolete THS4042CDG4. Both devices are manufactured by Texas Instruments and share identical electrical specifications across all measured parameters. The THS4042CD maintains active product status with higher inventory availability (1271 pcs) compared to the original part. This selection eliminates cross-manufacturer compatibility considerations and preserves the original design intent. The THS4042CD is supplied in tube packaging format.

Secondary Recommendation: LT1355CS8 Series (Analog Devices Inc.)

The LT1355CS8 family represents an alternative cross-manufacturer solution when THS4042CD availability is constrained. All variants (LT1355CS8, LT1355CS8#PBF, LT1355CS8#TR, LT1355CS8#TRPBF) are functionally equivalent and differ only in packaging and distribution format. The LT1355CS8#TRPBF variant offers the highest inventory level (50300 pcs) and is supplied in cut tape and digi-reel format for automated assembly.

Compatibility Considerations:

The LT1355CS8 series exhibits lower input bias current (80 nA vs. 2.5 µA) and lower input offset voltage (300 µV vs. 2.5 mV), which represent performance improvements over the THS4042CDG4. However, the LT1355 delivers reduced output current per channel (30 mA vs. 100 mA) and lower supply current (1 mA vs. 8 mA per channel). Applications requiring the full 100 mA output current specification must remain with the THS4042CD. Applications with output current requirements below 30 mA benefit from the LT1355 series' lower power consumption and superior input characteristics.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and identical operating temperature range (0°C ~ 70°C). Package geometry is identical across all options (8-SOIC, 0.154" width, 3.90mm).

Frequently Asked Questions (FAQ)

Q: Can the LT1355CS8 directly replace the THS4042CDG4 in existing designs?

A: The LT1355CS8 is pin-compatible and functionally compatible for applications requiring output current below 30 mA per channel. Applications requiring the full 100 mA output current specification must use the THS4042CD. Both devices operate across the same temperature range and maintain identical package geometry.

Q: What is the difference between LT1355CS8, LT1355CS8#PBF, LT1355CS8#TR, and LT1355CS8#TRPBF?

A: These part numbers represent the same device with different packaging and distribution formats. LT1355CS8#TRPBF is supplied in cut tape and digi-reel format suitable for automated assembly. LT1355CS8#PBF is supplied in tube packaging. LT1355CS8#TR and LT1355CS8 represent alternative packaging designations. Electrical specifications are identical across all variants.

Q: Why does the LT1355CS8 have lower input bias current than the THS4042CDG4?

A: The LT1355 and THS4042 employ different input stage architectures. The LT1355 uses a lower input bias current design (80 nA), which represents a performance advantage in high-impedance signal conditioning applications. This difference does not affect substitution compatibility for most applications.

Q: Is the THS4042CD available in the same packaging as the THS4042CDG4?

A: Both devices use the 8-SOIC package with identical 0.154" width and 3.90mm dimensions. The THS4042CD is supplied in tube packaging, while the original THS4042CDG4 packaging format is not specified in the provided data.

Q: What is the supply current difference between THS4042CD and LT1355CS8?

A: The THS4042CD draws 8 mA per channel (16 mA total for dual channels), while the LT1355CS8 draws 1 mA per channel (2 mA total for dual channels). This 8x reduction in supply current with the LT1355 provides significant power savings in battery-powered or thermally constrained applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The THS4042CD and all LT1355CS8 variants are ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity rating. All parts are REACH unaffected and classified under ECCN EAR99.

Q: Which substitute part should be selected for highest inventory availability?

A: The LT1355CS8#TRPBF offers the highest inventory level at 50300 pcs. This variant is supplied in cut tape and digi-reel format optimized for high-volume automated assembly operations.

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