TSH74CDT Equivalent & Substitute Parts

Part Overview

The TSH74CDT is a general-purpose operational amplifier manufactured by STMicroelectronics, featuring four independent circuits in a 14-SOIC surface-mount package. This device delivers rail-to-rail output capability with a 65 MHz gain-bandwidth product and operates across a 3 V to 12 V supply range. The TSH74CDT is classified as obsolete, necessitating identification of active substitute components that maintain functional and electrical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Manufacturer Part Number	TSH74CDT	—
Manufacturer	STMicroelectronics	—
Category	Linear, Amplifiers	—
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Output Type	Rail-to-Rail	—
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	12	V
Operating Temperature	0°C ~ 70°C	—
Product Status	Obsolete	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute components for the TSH74CDT are selected based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Four independent circuits per package
Rail-to-rail output configuration
14-SOIC surface-mount package (0.154", 3.90mm width)
Supply voltage range overlap: minimum 3 V, maximum 12 V
Surface-mount technology compatibility

Substitution Logic:

Substitute parts are grouped into two functional categories:

General Purpose Amplifiers (Direct Functional Equivalents): Parts maintaining general-purpose amplifier classification with comparable gain-bandwidth products and slew rates. These include LT1805 series variants, which preserve the general-purpose amplifier topology while offering extended temperature ranges and improved performance metrics.
Voltage Feedback Amplifiers (Enhanced Performance Alternatives): Parts utilizing voltage feedback topology with higher bandwidth and slew rate specifications. These include AD8054 series variants and LMH6644 series components, which provide superior frequency response and faster transient performance while maintaining the four-circuit, rail-to-rail, 14-SOIC package configuration.
Buffer/Voltage Feedback Hybrids (High-Speed Alternatives): The MAX4222ESD+ combines buffer and voltage feedback amplifier functionality with significantly elevated slew rate and bandwidth specifications, suitable for applications requiring enhanced speed performance.

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and surface-mount 14-SOIC packaging, ensuring mechanical and environmental compatibility with the original TSH74CDT footprint.

Parameter Comparison

Parameter	TSH74CDT	AD8054ARZ-REEL7	LMH6644MA/NOPB	LT1805IS#PBF	MAX4222ESD+
Manufacturer	STMicroelectronics	Analog Devices Inc.	Texas Instruments	Analog Devices Inc.	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete	Active	Active	Active	Active
Amplifier Type	General Purpose	Voltage Feedback	Voltage Feedback	General Purpose	Buffer, Voltage Feedback
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
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
Voltage - Supply Span (Min)	3 V	3 V	2.7 V	2.3 V	3.15 V
Voltage - Supply Span (Max)	12 V	12 V	12.8 V	12.6 V	11 V
Operating Temperature	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Slew Rate	118 V/µs	190 V/µs	135 V/µs	100 V/µs	600 V/µs
Gain Bandwidth Product	65 MHz	—	—	83 MHz	—
-3dB Bandwidth	100 MHz	160 MHz	130 MHz	—	200 MHz
Current - Input Bias	6 µA	2 µA	1.6 µA	2.5 µA	5.4 µA
Voltage - Input Offset	1.1 mV	1.8 mV	1 mV	1.5 mV	4 mV
Current - Supply	8.2 mA	2.875 mA (x4 Channels)	2.7 mA (x4 Channels)	2.5 mA (x4 Channels)	5.5 mA (x4 Channels)
Current - Output / Channel	55 mA	30 mA	75 mA	50 mA	120 mA
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 Direct Functional Replacement:

The LT1805 series (LT1805IS#PBF, LT1805IS#TRPBF, LT1805CS#PBF, LT1805CS#TRPBF) provides the closest functional equivalence to the TSH74CDT. These components maintain general-purpose amplifier classification with comparable gain-bandwidth products (83 MHz versus 65 MHz) and slew rates (100 V/µs versus 118 V/µs). The LT1805 series offers extended operating temperature ranges (-40°C to 85°C) compared to the original part (0°C to 70°C), providing improved thermal performance. All variants are active products with ROHS3 compliance and MSL Level 1 rating. Selection between tube and tape-and-reel packaging variants depends on procurement and assembly requirements.

For Enhanced Performance Applications:

The AD8054ARZ-REEL7 (Analog Devices Inc.) and LMH6644MA/NOPB (Texas Instruments) deliver superior frequency response and transient performance through voltage feedback topology. The AD8054ARZ-REEL7 provides the widest operating temperature range (-40°C to 125°C) with 160 MHz bandwidth and 190 V/µs slew rate. The LMH6644MA/NOPB offers the highest output current per channel (75 mA) with 130 MHz bandwidth and operates across an extended supply voltage range (2.7 V to 12.8 V). Both components are active products with full ROHS3 compliance.

For High-Speed Applications:

The MAX4222ESD+ combines buffer and voltage feedback amplifier functionality with the highest slew rate (600 V/µs) and bandwidth (200 MHz) among available substitutes. This component is suitable for applications requiring maximum speed performance, though it exhibits higher input offset voltage (4 mV) and operates within a narrower supply voltage range (3.15 V to 11 V). The MAX4222ESD+ maintains active product status and ROHS3 compliance.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and MSL Level 1 (unlimited moisture sensitivity) ratings, ensuring compatibility with standard surface-mount assembly processes and environmental requirements. All components carry EAR99 ECCN classification and REACH unaffected status, matching the regulatory profile of the original TSH74CDT.

Frequently Asked Questions (FAQ)

Q: Can the AD8054ARZ-REEL7 directly replace the TSH74CDT in existing designs?

A: The AD8054ARZ-REEL7 is mechanically and electrically compatible with the TSH74CDT, sharing the same 14-SOIC package footprint and rail-to-rail output configuration. However, the AD8054ARZ-REEL7 implements voltage feedback topology rather than general-purpose amplifier topology, resulting in different frequency response characteristics. The AD8054ARZ-REEL7 provides higher bandwidth (160 MHz versus 100 MHz) and faster slew rate (190 V/µs versus 118 V/µs). Circuit performance must be evaluated for applications sensitive to these topology differences.

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

A: Both variants are identical in electrical specifications and performance. The primary difference is packaging format: LT1805IS#PBF is supplied in tube packaging, while LT1805IS#TRPBF is supplied in tape-and-reel format. Selection depends on procurement volume and assembly line requirements. Tape-and-reel packaging is typically preferred for automated assembly processes.

Q: Why does the MAX4222ESD+ have a higher slew rate than other substitutes?

A: The MAX4222ESD+ combines buffer and voltage feedback amplifier functionality, which inherently enables higher slew rate performance (600 V/µs). This topology is optimized for high-speed signal conditioning applications. The trade-off is increased input offset voltage (4 mV) and a narrower supply voltage operating range compared to other substitutes.

Q: Are all substitute parts suitable for the full 0°C to 70°C operating temperature range of the TSH74CDT?

A: All substitute parts exceed the original operating temperature range. The LT1805 series, AD8054ARZ-REEL7, LMH6644MA/NOPB, and MAX4222ESD+ all operate at -40°C minimum, providing enhanced low-temperature performance. The AD8054ARZ-REEL7 extends to 125°C maximum, offering superior high-temperature capability. Applications operating within the original 0°C to 70°C range will function within the specified operating windows of all substitutes.

Q: What is the significance of the 14-SOIC package specification?

A: The 14-SOIC (Small Outline Integrated Circuit) package with 0.154" width and 3.90mm width specification ensures mechanical compatibility with existing printed circuit board layouts designed for the TSH74CDT. All substitute parts maintain this identical package specification, enabling direct footprint compatibility without PCB redesign. This standardization applies to pin pitch, lead spacing, and overall package dimensions.

Q: Can I use the LMH6644MA/NOPB in applications requiring the lowest supply current?

A: The LMH6644MA/NOPB delivers the lowest total supply current among active substitutes at 2.7 mA per four channels, compared to 8.2 mA for the original TSH74CDT. This represents a 67% reduction in supply current, making the LMH6644MA/NOPB suitable for power-constrained applications. The AD8054ARZ-REEL7 provides comparable supply current efficiency at 2.875 mA per four channels.

Q: What output current capability should I consider when selecting a substitute?

A: Output current per channel varies significantly among substitutes. The MAX4222ESD+ provides the highest output current (120 mA per channel), followed by LMH6644MA/NOPB (75 mA per channel) and TSH74CDT (55 mA per channel). The AD8054ARZ-REEL7 and LT1805 series provide lower output current (30 mA and 50 mA per channel, respectively). Selection depends on load impedance and drive requirements in the target application.

Q: Are there packaging format options for the AD8054 series?

A: The AD8054 series is available in three packaging variants: AD8054ARZ (tube packaging), AD8054ARZ-REEL (standard reel packaging), and AD8054ARZ-REEL7 (cut tape and Digi-Reel packaging). All variants are electrically identical with identical electrical specifications. Selection depends on procurement volume and assembly process requirements.

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