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TS1872ID Equivalent & Substitute Parts
Part Overview
The TS1872ID is a general-purpose operational amplifier manufactured by STMicroelectronics, configured as a dual-channel (2 circuit) rail-to-rail amplifier in an 8-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production continuity. The TS1872ID operates across a supply voltage range of 1.8 V to 6 V with an operating temperature range of -40°C to 125°C, making it suitable for low-power analog signal processing applications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 2 | — |
| Output Type | Rail-to-Rail | — |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Slew Rate | 0.6 | V/µs |
| Gain Bandwidth Product | 1.8 | MHz |
| Current - Input Bias | 70 | nA |
| Voltage - Input Offset | 100 | µV |
| Current - Supply (x2 Channels) | 500 | µA |
| Current - Output / Channel | 80 | mA |
| Voltage - Supply Span (Min) | 1.8 | V |
| Voltage - Supply Span (Max) | 6 | V |
| Operating Temperature | -40 to 125 | °C |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the TS1872ID is determined by strict compatibility across the following critical parameters:
Primary Substitution Criteria:
- Package / Case: 8-SOIC (0.154", 3.90mm Width)
- Number of Circuits: 2
- Output Type: Rail-to-Rail
- Mounting Type: Surface Mount
- Operating Temperature Range: -40°C to 125°C
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level: 1 (Unlimited)
Secondary Compatibility Factors:
- Voltage - Supply Span (Min): 1.8 V minimum or lower
- Voltage - Supply Span (Max): 6 V maximum or higher
- Current - Output / Channel: 80 mA or greater
- Amplifier Type: General Purpose
Substitute parts are grouped into two categories based on amplifier technology:
Category 1: General Purpose Amplifiers — Direct functional equivalents with identical or superior electrical performance characteristics. These include STMicroelectronics TS1872IDT and Analog Devices AD8542ARZ series, which maintain the general-purpose amplifier classification and support the full supply voltage range of the original device.
Category 2: CMOS Amplifiers — Enhanced performance alternatives with superior slew rate, gain bandwidth product, and input bias current characteristics. These include Analog Devices AD8602 and AD8606 series, which offer improved dynamic performance while maintaining package compatibility and operating temperature specifications.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Slew Rate (V/µs) | Gain Bandwidth Product (MHz) | Current - Input Bias (pA/nA) | Voltage - Input Offset (µV) | Current - Supply (µA) | Current - Output / Channel (mA) | Voltage - Supply Span Min (V) | Voltage - Supply Span Max (V) | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| TS1872ID | STMicroelectronics | General Purpose | 0.6 | 1.8 | 70 nA | 100 | 500 | 80 | 1.8 | 6 | Obsolete |
| TS1872IDT | STMicroelectronics | General Purpose | 0.6 | 1.8 | 70 nA | 100 | 500 | 80 | 1.8 | 6 | Active |
| AD8542ARZ | Analog Devices Inc. | General Purpose | 0.92 | 1 | 4 pA | 1000 | 45 | 30 | 2.7 | 5.5 | Active |
| AD8542ARZ-REEL | Analog Devices Inc. | General Purpose | 0.92 | 1 | 4 pA | 1000 | 45 | 30 | 2.7 | 5.5 | Active |
| AD8542ARZ-REEL7 | Analog Devices Inc. | General Purpose | 0.92 | 1 | 4 pA | 1000 | 45 | 30 | 2.7 | 5.5 | Active |
| AD8602WARZ-R7 | Analog Devices Inc. | CMOS | 6 | 8.4 | 0.2 pA | 80 | 750 | 50 | 2.7 | 5.5 | Active |
| AD8602WARZ-RL | Analog Devices Inc. | CMOS | 6 | 8.4 | 0.2 pA | 80 | 750 | 50 | 2.7 | 5.5 | Active |
| AD8606ARZ | Analog Devices Inc. | CMOS | 5 | 10 | 1 pA | 80 | 1000 | 80 | 2.7 | 5.5 | Active |
| AD8606ARZ-REEL | Analog Devices Inc. | CMOS | 5 | 10 | 1 pA | 80 | 1000 | 80 | 2.7 | 5.5 | Active |
| AD8606ARZ-REEL7 | Analog Devices Inc. | CMOS | 5 | 10 | 1 pA | 80 | 1000 | 80 | 2.7 | 5.5 | Active |
| AD8646ARZ | Analog Devices Inc. | General Purpose | 11 | 24 | 0.3 pA | 600 | 1500 | 120 | 2.7 | 5.5 | Active |
Engineering Selection Recommendations
Direct Equivalent (Recommended for Pin-Compatible Replacement):
The TS1872IDT is the primary substitute for the obsolete TS1872ID. Both devices are manufactured by STMicroelectronics and share identical electrical specifications, package configuration, and operating parameters. The TS1872IDT is classified as an active product with current production status and maintains full compatibility with existing designs. This part is available in Cut Tape and Digi-Reel packaging formats, supporting both prototype and production volume requirements.
General Purpose Amplifier Alternatives (Analog Devices AD8542 Series):
The AD8542ARZ, AD8542ARZ-REEL, and AD8542ARZ-REEL7 variants are active general-purpose amplifiers from Analog Devices that maintain the 8-SOIC package format and dual-channel configuration. These devices operate within a reduced supply voltage range (2.7 V to 5.5 V maximum) compared to the TS1872ID (1.8 V to 6 V). The AD8542 series exhibits superior input bias current performance (4 pA versus 70 nA) and lower supply current consumption (45 µA versus 500 µA). However, output current capability is reduced to 30 mA per channel. Selection of AD8542 variants is appropriate for applications where the reduced supply voltage range is acceptable and lower power consumption is beneficial.
Enhanced Performance CMOS Alternatives (Analog Devices AD8602 and AD8606 Series):
The AD8602WARZ-R7, AD8602WARZ-RL, AD8606ARZ, AD8606ARZ-REEL, and AD8606ARZ-REEL7 are CMOS amplifiers offering significantly improved dynamic performance characteristics. The AD8606 series provides the highest gain bandwidth product (10 MHz) and slew rate (5 V/µs) among available substitutes, with output current capability matching the original device (80 mA per channel). These devices operate within the 2.7 V to 5.5 V supply range and are classified as active products. Selection of CMOS alternatives is appropriate for applications requiring enhanced frequency response and faster signal settling time.
High-Performance General Purpose Alternative (AD8646ARZ):
The AD8646ARZ is an active general-purpose amplifier offering the highest performance specifications among all substitutes, with a gain bandwidth product of 24 MHz and slew rate of 11 V/µs. Output current capability is 120 mA per channel. This device operates within the 2.7 V to 5.5 V supply range. The AD8646ARZ is suitable for applications requiring maximum bandwidth and output drive capability, though it operates at a reduced minimum supply voltage compared to the original TS1872ID.
All substitute parts listed maintain ROHS3 compliance, MSL Level 1 (Unlimited) moisture sensitivity rating, and the -40°C to 125°C operating temperature specification of the original device.
Frequently Asked Questions (FAQ)
Q: Can the TS1872IDT be used as a direct replacement for the TS1872ID?
A: Yes. The TS1872IDT is manufactured by STMicroelectronics and provides identical electrical specifications, package configuration, and operating parameters to the obsolete TS1872ID. The primary difference is product status: TS1872IDT is an active product with current manufacturing support, while TS1872ID is obsolete. No circuit modifications are required for substitution.
Q: What is the key difference between the TS1872IDT and the AD8542ARZ series?
A: Both are general-purpose dual-channel amplifiers in 8-SOIC packages. The TS1872IDT maintains the original supply voltage range of 1.8 V to 6 V, while the AD8542ARZ series operates within 2.7 V to 5.5 V. The AD8542 series offers superior input bias current (4 pA versus 70 nA) and lower supply current consumption (45 µA versus 500 µA), but provides reduced output current per channel (30 mA versus 80 mA). Selection depends on whether the reduced supply voltage range and lower output current are acceptable for the application.
Q: When should I consider CMOS alternatives like the AD8602 or AD8606?
A: CMOS alternatives are appropriate when the application requires improved frequency response, faster slew rate, or lower input bias current compared to the original TS1872ID. The AD8606 series provides the best balance of performance, with 10 MHz gain bandwidth product, 5 V/µs slew rate, and 80 mA output current per channel. However, these devices operate within the 2.7 V to 5.5 V supply range, which may not be suitable for applications requiring the full 1.8 V to 6 V range of the original device.
Q: Are all substitute parts available in the same packaging options?
A: No. The TS1872IDT is available in Cut Tape and Digi-Reel packaging. The AD8542 series offers both Tube and Cut Tape/Digi-Reel options. The AD8602 and AD8606 series are available in Cut Tape/Digi-Reel and Tube formats. Verify packaging availability with your supplier to ensure compatibility with your procurement and assembly processes.
Q: What is the significance of the "-REEL" and "-REEL7" suffixes on Analog Devices part numbers?
A: These suffixes indicate packaging format variations. The "-REEL" designation indicates Cut Tape and Digi-Reel packaging, while "-REEL7" indicates a specific reel configuration. Both formats are suitable for automated assembly processes. The electrical specifications remain identical across these packaging variants.
Q: Can I use the AD8646ARZ if my application requires maximum performance?
A: The AD8646ARZ offers the highest performance specifications among all substitutes, with 24 MHz gain bandwidth product, 11 V/µs slew rate, and 120 mA output current per channel. However, it operates within the 2.7 V to 5.5 V supply range, which does not support the full 1.8 V minimum supply voltage of the original TS1872ID. Use the AD8646ARZ only if your application operates within the 2.7 V to 5.5 V range and requires the enhanced performance characteristics.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory compliance status of the original TS1872ID.
Q: What should I verify before implementing a substitute part?
A: Verify the following parameters for your specific application: (1) Supply voltage range compatibility, particularly the minimum supply voltage requirement; (2) Output current per channel requirement; (3) Frequency response and slew rate requirements; (4) Input bias current and offset voltage specifications; (5) Packaging format availability for your assembly process; (6) Thermal and operating temperature requirements. Consult the detailed datasheets for each substitute part to confirm compatibility with your circuit design.
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