TSH70CDT Equivalent & Substitute Parts

Part Overview

The STMicroelectronics TSH70CDT is a general-purpose operational amplifier with rail-to-rail output capability in an 8-SOIC surface mount package. This device is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The TSH70CDT delivers 1 circuit with 65 MHz gain-bandwidth product and operates across a 3V to 12V supply range, suitable for general-purpose amplification applications requiring moderate bandwidth and rail-to-rail output performance.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Package / Case	8-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	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the TSH70CDT are selected based on the following critical parameters that determine functional compatibility:

Mandatory Compatibility Criteria:

Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Output Type: Rail-to-Rail
Number of Circuits: 1
Voltage - Supply Span (Min): 3V or lower
Voltage - Supply Span (Max): 12V or higher
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All substitute parts listed meet these mandatory criteria. Differences in amplifier type (voltage feedback versus general purpose), slew rate, bandwidth, and operating temperature range represent performance enhancements or variations that do not prevent functional substitution within the specified supply voltage and package constraints.

Parameter Comparison

Parameter	TSH70CDT	AD8051ARZ	AD8051ARZ-REEL	AD8051ARZ-REEL7	AD8091ARZ	AD8091ARZ-REEL7	LMH6642MA/NOPB	LMH6642MAX/NOPB
Manufacturer	STMicroelectronics	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
Number of Circuits	1	1	1	1	1	1	1	1
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate	118 V/µs	170 V/µs	170 V/µs	170 V/µs	170 V/µs	170 V/µs	135 V/µs	135 V/µs
Gain Bandwidth Product	65 MHz	—	—	—	—	—	—	—
-3dB Bandwidth	100 MHz	110 MHz	110 MHz	110 MHz	110 MHz	110 MHz	130 MHz	130 MHz
Current - Input Bias	6 µA	1.4 µA	1.4 µA	1.4 µA	1.4 µA	1.4 µA	1.6 µA	1.6 µA
Voltage - Input Offset	800 µV	1.8 mV	1.8 mV	1.8 mV	1.8 mV	1.8 mV	1 mV	1 mV
Current - Supply	9.8 mA	4.8 mA	4.8 mA	4.8 mA	4.8 mA	4.8 mA	2.7 mA	2.7 mA
Current - Output / Channel	55 mA	45 mA	45 mA	45 mA	45 mA	45 mA	75 mA	75 mA
Voltage - Supply Span (Min)	3 V	3 V	3 V	3 V	3 V	3 V	2.7 V	2.7 V
Voltage - Supply Span (Max)	12 V	12 V	12 V	12 V	12 V	12 V	12.8 V	12.8 V
Operating Temperature	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°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)	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	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	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)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 compliance and MSL 1 rating, providing long-term availability and environmental regulatory compliance superior to the obsolete TSH70CDT.

Analog Devices AD8051 Series (AD8051ARZ, AD8051ARZ-REEL, AD8051ARZ-REEL7): These voltage feedback amplifiers provide enhanced performance with 170 V/µs slew rate and 110 MHz bandwidth. The AD8051ARZ-REEL variant matches the tape and reel packaging of the original TSH70CDT. The AD8051ARZ-REEL7 offers the highest inventory availability at 7104 units. Operating temperature range extends to -40°C to 125°C, exceeding the original specification.

Analog Devices AD8091 Series (AD8091ARZ, AD8091ARZ-REEL7): These voltage feedback amplifiers deliver identical electrical performance to the AD8051 series with 170 V/µs slew rate and 110 MHz bandwidth. Operating temperature range is -40°C to 85°C. The AD8091ARZ-REEL7 provides exceptional inventory depth at 90100 units in cut tape and digi-reel packaging.

Texas Instruments LMH6642 Series (LMH6642MA/NOPB, LMH6642MAX/NOPB): These voltage feedback amplifiers offer the highest bandwidth at 130 MHz and lowest supply current at 2.7 mA. Output current capability reaches 75 mA, exceeding the original specification. The LMH6642MAX/NOPB variant provides the largest inventory at 25800 units. Operating temperature range is -40°C to 85°C with extended supply voltage range to 12.8V maximum.

Frequently Asked Questions (FAQ)

Q: Can the AD8051ARZ-REEL directly replace the TSH70CDT in existing designs?

A: The AD8051ARZ-REEL is pin-compatible within the 8-SOIC package and meets all mandatory electrical parameters including rail-to-rail output, 3V to 12V supply operation, and surface mount configuration. The tape and reel packaging matches the original procurement format. Enhanced performance characteristics (higher slew rate, lower input bias current, extended temperature range) are backward-compatible with TSH70CDT applications.

Q: What is the difference between AD8051ARZ, AD8051ARZ-REEL, and AD8051ARZ-REEL7?

A: These three variants are electrically identical. The differences are packaging and distribution format: AD8051ARZ is supplied in tube packaging, AD8051ARZ-REEL is supplied in tape and reel format, and AD8051ARZ-REEL7 is supplied in cut tape and digi-reel format. Selection depends on procurement quantity and assembly line requirements.

Q: Why do the LMH6642 devices show lower supply current than the TSH70CDT?

A: The LMH6642MA/NOPB and LMH6642MAX/NOPB are optimized for low-power operation with 2.7 mA supply current compared to the TSH70CDT's 9.8 mA. This represents improved power efficiency while maintaining rail-to-rail output capability and 8-SOIC package compatibility. Lower supply current reduces thermal dissipation and power supply requirements in the application circuit.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification and MSL 1 (unlimited) moisture sensitivity rating, meeting current environmental and reliability standards for electronic component procurement.

Q: What is the significance of the -3dB bandwidth difference between TSH70CDT (100 MHz) and substitute parts (110-130 MHz)?

A: The substitute parts provide equal or superior bandwidth performance. The TSH70CDT operates at 100 MHz -3dB bandwidth, while AD8051 variants deliver 110 MHz and LMH6642 variants deliver 130 MHz. Higher bandwidth supports faster signal processing and improved transient response without compromising compatibility with existing circuit designs.

Q: Can I use the LMH6642MAX/NOPB in applications requiring the original 0°C to 70°C operating temperature range?

A: The LMH6642MAX/NOPB is rated for -40°C to 85°C operation, which encompasses the original 0°C to 70°C range. The extended lower temperature limit provides additional margin for cold environment applications. Designs operating within the original 0°C to 70°C window are fully supported.

Q: Which substitute part offers the best inventory availability?

A: The AD8091ARZ-REEL7 provides the highest inventory at 90100 units. The LMH6642MAX/NOPB offers 25800 units. Both represent substantial stock levels for production requirements.

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