TSH74CD Equivalent & Substitute Parts

Part Overview

The TSH74CD is a general-purpose operational amplifier integrated circuit manufactured by STMicroelectronics, configured as a 4-circuit rail-to-rail amplifier in a 14-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of active equivalent and substitute components for ongoing design support and procurement continuity. The TSH74CD operates across a 3 V to 12 V supply range with a slew rate of 118 V/µs and gain bandwidth product of 65 MHz, making it suitable for general-purpose amplification applications requiring moderate bandwidth performance.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Output Type	Rail-to-Rail	—
Slew Rate	118	V/µs
Gain Bandwidth Product	65	MHz
-3dB Bandwidth	100	MHz
Current - Input Bias	6	µA
Voltage - Input Offset	1.1	mV
Current - Supply	8.2	mA
Current - Output / Channel	55	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	12	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 of the TSH74CD is determined by the following critical parameters: four-circuit configuration, rail-to-rail output capability, 14-SOIC package compatibility, surface mount mounting type, and supply voltage range of 3 V to 12 V. Substitute parts are grouped into two functional categories based on amplifier type classification:

Category 1: General Purpose Amplifiers — Parts maintaining the general-purpose amplifier classification with comparable slew rate and bandwidth characteristics. These include the LT1805 series variants, which preserve the original functional intent of the TSH74CD.

Category 2: Voltage Feedback Amplifiers — Parts classified as voltage feedback amplifiers with enhanced performance characteristics, including the AD8054 series and LMH6644 series. These devices provide higher slew rates and bandwidth while maintaining the four-circuit, rail-to-rail, 14-SOIC configuration and supply voltage compatibility.

All substitute parts are active products with ROHS3 compliance, MSL 1 rating, and surface mount 14-SOIC packaging. The selection criteria prioritize package compatibility, circuit count, output type, and supply voltage range as non-negotiable parameters for direct substitution.

Parameter Comparison

Parameter	TSH74CD	AD8044ARZ-14	AD8054ARZ-REEL7	LMH6644MA/NOPB	LT1805IS#PBF
Manufacturer	STMicroelectronics	Analog Devices Inc.	Analog Devices Inc.	Texas Instruments	Analog Devices Inc.
Product Status	Obsolete	Active	Active	Active	Active
Amplifier Type	General Purpose	Voltage Feedback	Voltage Feedback	Voltage Feedback	General Purpose
Number of Circuits	4	4	4	4	4
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	118	190	190	135	100
Gain Bandwidth Product (MHz)	65	—	—	—	83
-3dB Bandwidth (MHz)	100	160	160	130	83
Current - Input Bias (µA)	6	2	2	1.6	2.5
Voltage - Input Offset (mV)	1.1	1.4	1.8	1	1.5
Current - Supply (mA)	8.2	11.5	2.875 (x4 Channels)	2.7 (x4 Channels)	2.5 (x4 Channels)
Current - Output / Channel (mA)	55	30	30	75	50
Voltage - Supply Span (Min) (V)	3	3	3	2.7	2.3
Voltage - Supply Span (Max) (V)	12	12	12	12.8	12.6
Operating Temperature (°C)	0 to 70	-40 to 85	-40 to 125	-40 to 85	-40 to 85
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For General Purpose Amplifier Applications with Matched Temperature Range (0°C to 70°C):

The LT1805IS#PBF and LT1805IS#TRPBF are direct functional equivalents to the TSH74CD, maintaining the general-purpose amplifier classification. These parts operate within the extended temperature range of -40°C to 85°C, providing broader environmental coverage than the original device. The LT1805 series delivers a gain bandwidth product of 83 MHz with a slew rate of 100 V/µs, closely aligned with the TSH74CD specifications. All LT1805 variants are active products with ROHS3 compliance and MSL 1 rating, ensuring long-term availability and environmental compliance.

For Applications Requiring Enhanced Performance:

The AD8054ARZ-REEL7 and AD8054ARZ variants provide voltage feedback amplifier topology with superior slew rate (190 V/µs) and -3dB bandwidth (160 MHz) compared to the TSH74CD. The AD8054ARZ-REEL7 offers the highest inventory availability (27,722 pieces) and operates across the extended temperature range of -40°C to 125°C. This device is suitable for applications where increased bandwidth and slew rate performance provide system advantages.

The LMH6644MA/NOPB from Texas Instruments offers voltage feedback amplification with 135 V/µs slew rate and 130 MHz bandwidth, positioned between the TSH74CD and AD8054 performance levels. This device provides the highest output current per channel (75 mA) and operates at the lowest supply current (2.7 mA per four channels), making it advantageous for power-constrained applications.

For Minimum Supply Voltage Compatibility:

The LMH6644 series supports a minimum supply voltage of 2.7 V, compared to the TSH74CD minimum of 3 V, enabling operation in lower-voltage system designs. The LT1805 series supports 2.3 V minimum supply voltage, providing the broadest low-voltage compatibility.

All recommended substitutes maintain the four-circuit configuration, rail-to-rail output capability, 14-SOIC package format, and surface mount mounting type required for direct PCB compatibility with the TSH74CD.

Frequently Asked Questions (FAQ)

Q: Can the AD8054ARZ-REEL7 directly replace the TSH74CD in existing designs?

A: The AD8054ARZ-REEL7 is mechanically and electrically compatible with the TSH74CD, sharing identical 14-SOIC package dimensions, four-circuit configuration, and rail-to-rail output capability. Both devices operate within the 3 V to 12 V supply range. However, the AD8054 is classified as a voltage feedback amplifier, whereas the TSH74CD is a general-purpose amplifier. The AD8054 exhibits higher slew rate (190 V/µs versus 118 V/µs) and bandwidth (160 MHz versus 100 MHz), which may alter circuit behavior in applications with specific frequency response or transient response requirements. Circuit validation is necessary to confirm performance equivalence in the target application.

Q: What is the difference between the LT1805CS#PBF and LT1805IS#PBF variants?

A: Both variants are general-purpose amplifiers with identical electrical specifications and 14-SOIC packaging. The primary difference is the operating temperature range: LT1805CS#PBF operates from 0°C to 70°C, matching the TSH74CD temperature range, while LT1805IS#PBF operates from -40°C to 85°C, providing extended low-temperature capability. The LT1805IS#PBF is recommended for applications requiring broader environmental coverage.

Q: Why do some substitute parts show lower supply current than the TSH74CD?

A: Supply current specifications reflect the quiescent current consumption of the device. The LT1805 series (2.5 mA per four channels) and AD8054 series (2.875 mA per four channels) consume significantly less quiescent current than the TSH74CD (8.2 mA total). This difference results from different internal circuit topologies and design optimization for power efficiency. Lower supply current does not indicate reduced functionality; it reflects improved power management in modern designs.

Q: Are all substitute parts available in tape and reel packaging?

A: Packaging availability varies by part number. The AD8054ARZ-REEL7 is specifically offered in Cut Tape (CT) and Digi-Reel® packaging with the highest inventory (27,722 pieces). The LMH6644MAX/NOPB is available in Tape & Reel (TR) packaging. The LT1805IS#TRPBF is available in Tape & Reel (TR) format. Tube packaging is available for LT1805CS#PBF, LMH6644MA/NOPB, and AD8044ARZ-14. Packaging selection should align with assembly process requirements and procurement volume.

Q: What is the significance of the REEL7 designation in the AD8054ARZ-REEL7 part number?

A: The REEL7 designation indicates the specific reel format used for tape and reel packaging. This designation ensures compatibility with standard pick-and-place assembly equipment configured for 7-inch reel specifications. The AD8054ARZ-REEL7 is functionally identical to the AD8054ARZ variant but optimized for high-volume automated assembly processes.

Q: Can the TSH74CD be replaced with a single-circuit operational amplifier?

A: No. The TSH74CD is a quad operational amplifier containing four independent amplifier circuits in a single 14-SOIC package. Any replacement must maintain the four-circuit configuration to preserve PCB layout compatibility and functional equivalence. Single-circuit operational amplifiers are not suitable substitutes.

Q: How do the input bias current specifications affect circuit design?

A: The TSH74CD exhibits 6 µA input bias current, while substitute parts range from 1.6 µA (LMH6644) to 2.5 µA (LT1805). Lower input bias current reduces errors in high-impedance input circuits and minimizes offset voltage drift with temperature. For applications with input impedances exceeding 1 MΩ, the lower input bias current of substitute parts provides improved accuracy. For standard applications with input impedances below 100 kΩ, input bias current differences are negligible.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental compliance profile of the TSH74CD. This ensures compatibility with modern manufacturing processes and regulatory requirements.

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