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TS27M2ACDT CMOS Amplifier Equivalent & Substitute Parts
Part Overview
The TS27M2ACDT is a CMOS dual-channel amplifier manufactured by STMicroelectronics in an 8-SOIC surface mount package. This device is classified as obsolete, indicating it is no longer in active production. The part operates across a 3V to 16V supply range with a 1 MHz gain bandwidth product and 0.6V/µs slew rate, designed for low-power CMOS amplification applications requiring dual-circuit functionality.
Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and system maintenance. Substitute components must maintain functional compatibility through matching circuit count, package type, electrical performance parameters, and operating temperature specifications.
Substiute Parts
Key Parameters
| Parameter | TS27M2ACDT Value | Unit |
|---|---|---|
| Amplifier Type | CMOS | — |
| Number of Circuits | 2 | — |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Slew Rate | 0.6 | V/µs |
| Gain Bandwidth Product | 1 | MHz |
| Current - Input Bias | 1 | pA |
| Voltage - Input Offset | 900 | µV |
| Current - Supply | 150 (x2 Channels) | µA |
| Current - Output / Channel | 45 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 16 | V |
| Operating Temperature | 0 to 70 | °C |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution compatibility for the TS27M2ACDT is determined by the following critical parameters:
Primary Matching Criteria:
- Number of Circuits: Must be 2 (dual-channel configuration)
- Package Type: Must be 8-SOIC surface mount
- Amplifier Type: CMOS technology preferred for functional equivalence
- Supply Voltage Range: Minimum 3V, Maximum ≥16V
- Operating Temperature: Must support 0°C to 70°C minimum range
Secondary Compatibility Parameters:
- Slew Rate: ≥0.6V/µs
- Gain Bandwidth Product: ≥1 MHz
- Current - Input Bias: ≤1 pA (ultra-low bias current requirement)
- Current - Output / Channel: ≥45 mA
- RoHS3 Compliance and MSL Level 1 rating
Substitute parts are grouped into two categories:
Category A - Direct CMOS Equivalents (ICL7621 Series): Rail-to-rail CMOS amplifiers with enhanced performance specifications, matching dual-circuit configuration and 8-SOIC packaging. These parts exceed the TS27M2ACDT electrical specifications while maintaining backward compatibility.
Category B - General Purpose Amplifier Alternatives (LM2904 Series): Dual-channel operational amplifiers in 8-SOIC packages with broader supply voltage ranges and extended temperature ratings. These parts provide functional substitution with different amplifier topology (general purpose vs. CMOS-specific).
Parameter Comparison
| Parameter | TS27M2ACDT | ICL7621BCSA+ | ICL7621BCSA+T | ICL7621BESA+ | LM2904DR | LM2904DR2G | LM2904DRG3 | LM2904DRG4 | LM2904M/NOPB | LM2904MX |
|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | STMicroelectronics | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Rohm Semiconductor | onsemi | Texas Instruments | Texas Instruments | Texas Instruments | Rohm Semiconductor |
| Number of Circuits | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Amplifier Type | CMOS | CMOS | CMOS | CMOS | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose |
| Package / Case | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Slew Rate (V/µs) | 0.6 | 1.6 | 1.6 | 1.6 | 0.3 | — | 0.3 | 0.3 | — | 0.3 |
| Gain Bandwidth Product (MHz) | 1 | 1.4 | 1.4 | 1.4 | 0.7 | 1 | 0.7 | 0.7 | 1 | 1 |
| Current - Input Bias (pA/nA) | 1 pA | 1 pA | 1 pA | 1 pA | 20 nA | 45 nA | 20 nA | 20 nA | 45 nA | 20 nA |
| Voltage - Input Offset (mV/µV) | 900 µV | 5 mV | 5 mV | 5 mV | 3 mV | 2 mV | 3 mV | 3 mV | 2 mV | 3 mV |
| Current - Supply (µA/mA) | 150 (x2) | 1 mA | 1 mA | 1 mA | 1 mA | 800 (x2) | 500 (x2) | 500 (x2) | 1 mA | 1 mA |
| Current - Output / Channel (mA) | 45 | — | — | — | 40 | 40 | 40 | 40 | 40 | 40 |
| Voltage - Supply Span Min (V) | 3 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 |
| Voltage - Supply Span Max (V) | 16 | 16 | 16 | 16 | 26 | 26 | 26 | 26 | 32 | 26 |
| Operating Temperature (°C) | 0 to 70 | 0 to 70 | 0 to 70 | -40 to 85 | -40 to 125 | -40 to 85 | -40 to 125 | -40 to 125 | -40 to 85 | -40 to 70 |
| Product Status | Obsolete | Active | Active | Active | Not For New Designs | Active | Last Time Buy | Obsolete | Active | Obsolete |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
For Direct CMOS Technology Substitution:
The ICL7621 series (ICL7621BCSA+, ICL7621BCSA+T, ICL7621BESA+) represents the closest functional equivalent to the TS27M2ACDT. All three variants maintain dual-circuit CMOS architecture in 8-SOIC packaging with superior electrical performance. The ICL7621BCSA+ and ICL7621BCSA+T are available in active product status with commercial temperature range (0°C to 70°C), matching the TS27M2ACDT operating window. The ICL7621BESA+ extends the temperature range to -40°C to 85°C for applications requiring broader thermal operation. All ICL7621 variants are ROHS3 compliant with MSL Level 1 rating, ensuring regulatory and environmental compatibility.
For General Purpose Amplifier Substitution:
The LM2904 series provides functional dual-channel amplification in 8-SOIC packages with extended supply voltage ranges (up to 26V or 32V) and broader operating temperature specifications. The LM2904DR2G and LM2904M/NOPB are in active product status, offering long-term availability. The LM2904DRG3 is designated Last Time Buy, indicating limited future availability. The LM2904DR and LM2904DRG4 are obsolete or not recommended for new designs. All LM2904 variants are ROHS3 compliant with MSL Level 1 rating.
Compliance and Certification:
All substitute parts listed maintain ROHS3 compliance and MSL Level 1 (unlimited moisture sensitivity) ratings, ensuring compatibility with existing supply chain and manufacturing processes. REACH status is unaffected across all parts, and ECCN classification remains EAR99 for all substitutes.
Product Status Considerations:
For new designs or long-term production, ICL7621BCSA+T (Tape & Reel, Active status) or LM2904M/NOPB (Active status) are preferred selections. For existing inventory management or legacy system support, ICL7621BESA+ provides extended temperature operation with active product status.
Frequently Asked Questions (FAQ)
Q: Can the ICL7621BCSA+ directly replace the TS27M2ACDT in existing designs?
A: The ICL7621BCSA+ is functionally compatible as a direct replacement. Both devices are dual-channel CMOS amplifiers in 8-SOIC packages with matching supply voltage ranges (3V to 16V minimum/maximum). The ICL7621BCSA+ provides superior slew rate (1.6V/µs vs. 0.6V/µs) and gain bandwidth product (1.4 MHz vs. 1 MHz). Operating temperature ranges differ slightly (0°C to 70°C for both), ensuring thermal compatibility. Pin configuration and package dimensions are identical.
Q: What is the difference between ICL7621BCSA+ and ICL7621BCSA+T?
A: Both parts are electrically identical ICL7621 CMOS amplifiers with matching electrical specifications. The primary difference is packaging format: ICL7621BCSA+ is supplied in Tube packaging, while ICL7621BCSA+T is supplied in Tape & Reel (TR) format. Selection depends on manufacturing process requirements and inventory management preferences. Tape & Reel format is typically preferred for automated assembly operations.
Q: Why do LM2904 series parts have lower slew rates than the TS27M2ACDT?
A: The LM2904 series are general-purpose operational amplifiers, not CMOS-specific designs. The LM2904DR, LM2904DRG3, and LM2904DRG4 exhibit 0.3V/µs slew rates, which is lower than the TS27M2ACDT (0.6V/µs). However, the LM2904DR2G and LM2904M/NOPB achieve 1 MHz gain bandwidth product matching the TS27M2ACDT specification. Slew rate selection depends on application bandwidth requirements and signal fidelity specifications.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed (ICL7621 series and LM2904 series) are ROHS3 compliant with MSL Level 1 (unlimited) moisture sensitivity rating. This ensures compatibility with current environmental regulations and manufacturing standards.
Q: What is the significance of "Active" vs. "Obsolete" product status?
A: Active status indicates the manufacturer continues production and supports the part for new designs. Obsolete status indicates production has ended. For the TS27M2ACDT (obsolete), substitutes with Active status (ICL7621BCSA+, ICL7621BCSA+T, ICL7621BESA+, LM2904DR2G, LM2904M/NOPB) provide long-term availability and design continuity. Last Time Buy status (LM2904DRG3) indicates limited future availability.
Q: Can I use an LM2904 part in place of an ICL7621 part?
A: Functional substitution is possible due to matching dual-circuit configuration and 8-SOIC packaging. However, electrical performance differs: LM2904 parts have lower slew rates (0.3V/µs to unspecified) and input bias currents in the nanoampere range (20-45 nA) versus ICL7621 parts with 1.6V/µs slew rate and 1 pA input bias. Application-specific performance requirements determine suitability. General-purpose amplification applications tolerate these differences; precision low-bias-current applications require ICL7621 selection.
Q: What is the operating temperature range compatibility?
A: The TS27M2ACDT operates from 0°C to 70°C. ICL7621BCSA+ and ICL7621BCSA+T match this range exactly. ICL7621BESA+ extends to -40°C to 85°C. LM2904 series parts vary: LM2904DR and LM2904DRG3/DRG4 support -40°C to 125°C; LM2904DR2G and LM2904M/NOPB support -40°C to 85°C. For applications requiring the original 0°C to 70°C window, all substitutes are compatible. Extended temperature applications require LM2904 selection.
Q: Is the 8-SOIC package identical across all listed parts?
A: Yes. All parts use 8-SOIC (0.154", 3.90mm Width) surface mount packaging. Pin count, spacing, and physical dimensions are standardized. PCB layout and footprints are interchangeable. The LM2904MX specifies 8-SOP supplier device package but maintains 8-SOIC case dimensions, ensuring mechanical compatibility.
Q: What supply voltage range should I verify for my application?
A: The TS27M2ACDT operates from 3V to 16V. All ICL7621 variants support 2V to 16V, providing lower minimum voltage operation. LM2904 series parts support 3V to 26V (most variants) or 3V to 32V (LM2904M/NOPB), providing higher maximum voltage operation. Verify your application's supply voltage specification falls within the substitute part's range before selection.
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