TS944ID Equivalent & Substitute Parts

Part Overview

The TS944ID 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, indicating discontinued production and limited availability for new designs. The TS944ID operates across a supply voltage range of 2.5 V to 10 V with an operating temperature range of -40°C to 85°C. Identification of equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications currently utilizing this component.

Key Parameters

Parameter	TS944ID Value	Unit
Manufacturer	STMicroelectronics	—
Product Status	Obsolete	—
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)	2.5	V
Voltage - Supply Span (Max)	10	V
Operating Temperature	-40 to 85	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the TS944ID is determined by the following critical parameters: package type (14-SOIC surface mount), circuit count (4 circuits), output configuration (rail-to-rail), and supply voltage compatibility. The TS944ID operates within a 2.5 V to 10 V supply range; substitute parts must support this range or extend it. All identified substitute parts share the 14-SOIC package format, surface mount configuration, and 4-circuit rail-to-rail architecture, ensuring mechanical and electrical compatibility at the board level.

Substitute parts are grouped into two categories based on product status and performance characteristics:

Category 1: Active General Purpose Amplifiers (LMP7704 and LMV844 Series) These parts maintain active production status and provide enhanced performance specifications compared to the obsolete TS944ID. The LMP7704MA/NOPB and LMP7704MAX/NOPB (Texas Instruments) deliver superior gain bandwidth product (2.5 MHz) and slew rate (1.1 V/µs). The LMV844 series (LMV844MA/NOPB, LMV844MAX/NOPB, LMV844QMA/NOPB, LMV844QMAX/NOPB) offers further performance improvements with 4.5 MHz gain bandwidth product and 2.5 V/µs slew rate, with automotive-grade variants available.

Category 2: Alternative Amplifier Topologies (MAX4222 and OP496 Series) The MAX4222ESD+ and MAX4222ESD+T (Analog Devices Inc./Maxim Integrated) function as buffer/voltage feedback amplifiers with significantly higher performance (600 V/µs slew rate, 200 MHz bandwidth) but operate within a narrower minimum supply voltage (3.15 V). The OP496GSZ and OP496GSZ-REEL (Analog Devices Inc.) are CMOS amplifiers with lower slew rate (0.3 V/µs) and gain bandwidth product (450 kHz) but feature extremely low input bias current (10 nA).

Parameter Comparison

Parameter	TS944ID	LMP7704MA/NOPB	LMV844MA/NOPB	LMV844QMA/NOPB	MAX4222ESD+	OP496GSZ
Manufacturer	STMicroelectronics	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices Inc./Maxim	Analog Devices Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active
Number of Circuits	4	4	4	4	4	4
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Voltage - Supply Span (Min)	2.5 V	2.7 V	2.7 V	2.7 V	3.15 V	3 V
Voltage - Supply Span (Max)	10 V	12 V	12 V	12 V	11 V	12 V
Operating Temperature	-40 to 85°C	-40 to 125°C	-40 to 125°C	-40 to 125°C	-40 to 85°C	-40 to 125°C
Slew Rate	0.0045 V/µs	1.1 V/µs	2.5 V/µs	2.5 V/µs	600 V/µs	0.3 V/µs
Gain Bandwidth Product	10 kHz	2.5 MHz	4.5 MHz	4.5 MHz	200 MHz	450 kHz
Current - Input Bias	1 pA	0.2 pA	4 pA	0.3 pA	5.4 µA	10 nA
Voltage - Input Offset	10 mV	37 µV	50 µV	50 µV	4 mV	35 µV
Current - Output / Channel	5 mA	86 mA	37 mA	37 mA	120 mA	4 mA
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

For Direct Replacement with Enhanced Performance: The LMP7704MA/NOPB and LMP7704MAX/NOPB are recommended as primary substitutes for the TS944ID. Both parts maintain active production status, share identical electrical and mechanical specifications, and provide superior performance characteristics including 250× higher gain bandwidth product and 244× higher slew rate. The minimum supply voltage increases from 2.5 V to 2.7 V, which is compatible with most applications. Both variants are ROHS3 compliant with MSL 1 rating.

For Applications Requiring Extended Temperature Range: The LMV844 series (LMV844MA/NOPB, LMV844MAX/NOPB) extends the operating temperature range to -40°C to 125°C, providing 40°C additional high-temperature capability. These parts deliver 4.5 MHz gain bandwidth product and 2.5 V/µs slew rate. The automotive-qualified variants (LMV844QMA/NOPB, LMV844QMAX/NOPB) carry AEC-Q100 qualification and are suitable for automotive applications.

For Applications Requiring Maximum Output Current: The MAX4222ESD+ and MAX4222ESD+T deliver 120 mA output current per channel (24× the TS944ID specification) with 600 V/µs slew rate and 200 MHz bandwidth. These parts operate within a minimum supply voltage of 3.15 V and maintain the same -40°C to 85°C temperature range as the TS944ID. Selection of this family requires verification that the application supply voltage meets the 3.15 V minimum threshold.

For Applications Requiring Minimal Input Bias Current: The OP496GSZ and OP496GSZ-REEL feature 10 nA input bias current (10,000× lower than the TS944ID) with CMOS architecture. These parts operate across 3 V to 12 V supply range and -40°C to 125°C temperature range. The lower slew rate (0.3 V/µs) and gain bandwidth product (450 kHz) are suitable for precision measurement and low-frequency signal conditioning applications.

All substitute parts are ROHS3 compliant with MSL 1 rating, ensuring compatibility with standard manufacturing processes and long-term storage requirements.

Frequently Asked Questions (FAQ)

Q: Can the LMP7704MA/NOPB directly replace the TS944ID without circuit modifications? A: The LMP7704MA/NOPB shares the 14-SOIC package, 4-circuit configuration, and rail-to-rail output architecture with the TS944ID. The minimum supply voltage increases from 2.5 V to 2.7 V. If the application supply voltage is 2.7 V or higher, direct substitution is possible. If the application operates at 2.5 V to 2.7 V, the LMP7704MA/NOPB is not suitable.

Q: What is the primary difference between the LMV844MA/NOPB and LMV844QMA/NOPB? A: Both parts share identical electrical specifications and package format. The LMV844QMA/NOPB carries AEC-Q100 automotive qualification and is specified for automotive applications. The LMV844MA/NOPB is the industrial-grade variant. Selection depends on application requirements and qualification standards.

Q: Why does the MAX4222ESD+ have a higher minimum supply voltage than the TS944ID? A: The MAX4222ESD+ is classified as a buffer/voltage feedback amplifier rather than a general purpose amplifier. This topology requires a minimum supply voltage of 3.15 V for proper operation. Applications operating at 2.5 V to 3.15 V supply voltage cannot use this part.

Q: Is the OP496GSZ suitable for high-frequency applications? A: The OP496GSZ has a gain bandwidth product of 450 kHz and slew rate of 0.3 V/µs, which are significantly lower than the LMP7704 and LMV844 series. This part is suitable for low-frequency and precision measurement applications. High-frequency applications require the LMP7704 or LMV844 series.

Q: Are all substitute parts available in both tube and tape & reel packaging? A: Packaging availability varies by part number. The LMP7704MA/NOPB is available in tube packaging. The LMP7704MAX/NOPB is available in cut tape and Digi-Reel packaging. The LMV844 series offers both tube and tape & reel variants. The MAX4222 series offers both tube and tape & reel variants. The OP496GSZ is available in tube packaging, while OP496GSZ-REEL is available in cut tape and Digi-Reel packaging. Verify packaging availability with the supplier for specific procurement requirements.

Q: What is the impact of the TS944ID obsolescence on long-term supply? A: The TS944ID is classified as obsolete with no active production. Current inventory is limited to 5,100 pieces. All identified substitute parts maintain active production status with significantly higher inventory levels, ensuring long-term supply chain reliability for new designs and ongoing production support.

Q: Can the OP496GSZ-REEL be used interchangeably with OP496GSZ? A: The OP496GSZ-REEL and OP496GSZ share identical electrical specifications and package format. The difference is packaging format: OP496GSZ is supplied in tube packaging, while OP496GSZ-REEL is supplied in cut tape and Digi-Reel packaging. Selection depends on assembly process requirements and procurement preferences.

Q: What is the significance of the ROHS3 compliance and MSL 1 rating across all parts? A: ROHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive, ensuring the parts do not contain restricted materials. MSL 1 (Unlimited) rating indicates the parts have unlimited shelf life and do not require special moisture control during storage or handling. All substitute parts meet these standards, ensuring compatibility with standard manufacturing and storage practices.

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