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TS27L4ACD CMOS Amplifier Equivalent & Substitute Parts
Part Overview
The TS27L4ACD is a CMOS amplifier integrated circuit manufactured by STMicroelectronics, configured as a 4-circuit operational amplifier in a 14-SOIC surface mount package. This device is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. The TS27L4ACD operates across a 3V to 16V supply range with ultra-low input bias current and is suitable for low-power analog signal processing applications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | CMOS | — |
| Number of Circuits | 4 | — |
| Slew Rate | 0.04 | V/µs |
| Gain Bandwidth Product | 100 | kHz |
| Current - Input Bias | 1 | pA |
| Voltage - Input Offset | 900 | µV |
| Current - Supply (x4 Channels) | 10 | µA |
| Current - Output / Channel | 45 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 16 | V |
| Operating Temperature | 0 to 70 | °C |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the TS27L4ACD is determined by compatibility across the following critical parameters: amplifier type (CMOS), number of circuits (4), package type (14-SOIC surface mount), supply voltage range, operating temperature range, and electrical performance specifications including slew rate, gain bandwidth product, input bias current, and output current capability.
Substitute parts are grouped into two categories:
Direct Functional Equivalent: Parts that maintain CMOS amplifier architecture with 4 circuits in 14-SOIC packaging and operate within overlapping supply voltage and temperature ranges.
Similar Performance Alternative: Parts that share the 4-circuit, 14-SOIC configuration but may differ in amplifier type classification (general purpose vs. CMOS), slew rate, or gain bandwidth product, requiring application-level verification of performance compatibility.
The following parameters establish substitution validity:
- Package type: 14-SOIC (0.154", 3.90mm Width)
- Number of circuits: 4
- Mounting type: Surface Mount
- Supply voltage range overlap: Minimum 3V to 16V maximum
- Output current per channel: Minimum 30 mA
- RoHS3 compliance and MSL 1 rating
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Slew Rate (V/µs) | GBW (kHz) | Input Bias (pA) | Input Offset (µV) | Supply Current (µA) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TS27L4ACD | STMicroelectronics | CMOS | 0.04 | 100 | 1 | 900 | 10 | 45 | 3 | 16 | 0 to 70 | Obsolete |
| TLC27L4AID | Texas Instruments | CMOS | 0.05 | 110 | 0.7 | 1100 | 57 | 30 | 4 | 16 | -40 to 85 | Last Time Buy |
| TLC1079CD | Texas Instruments | CMOS | 0.032 | 110 | 1 | 180 | 29 | 30 | 1.4 | 16 | 0 to 70 | Active |
| TLC1079CDR | Texas Instruments | CMOS | 0.032 | 110 | 1 | 180 | 29 | 30 | 1.4 | 16 | 0 to 70 | Last Time Buy |
| TLC1079ID | Texas Instruments | CMOS | 0.032 | 110 | 1 | 180 | 29 | 30 | 3 | 16 | -40 to 85 | Last Time Buy |
| TLC1079IDR | Texas Instruments | CMOS | 0.032 | 110 | 1 | 180 | 29 | 30 | 3 | 16 | -40 to 85 | Active |
| TLC274ACD | Texas Instruments | General Purpose | 3.6 | 2200 | 0.6 | 900 | 2700 | 30 | 3 | 16 | 0 to 70 | Obsolete |
| TLC274ACDR | Texas Instruments | General Purpose | 3.6 | 2200 | 0.6 | 900 | 2700 | 30 | 3 | 16 | 0 to 70 | Active |
| TLC274AIDR | Texas Instruments | General Purpose | 3.6 | 2200 | 0.6 | 900 | 2700 | 30 | 4 | 16 | -40 to 85 | Active |
| TLC274BCD | Texas Instruments | General Purpose | 3.6 | 2200 | 0.6 | 340 | 2700 | 30 | 3 | 16 | 0 to 70 | Obsolete |
| TLC274BCDR | Texas Instruments | General Purpose | 3.6 | 2200 | 0.6 | 340 | 2700 | 30 | 3 | 16 | 0 to 70 | Active |
Engineering Selection Recommendations
Primary Substitutes (Direct CMOS Equivalents):
The TLC1079IDR and TLC1079ID represent the most direct functional equivalents to the TS27L4ACD. Both maintain CMOS amplifier architecture with 4 circuits in 14-SOIC packaging. The TLC1079IDR is classified as Active product status, ensuring long-term availability and supply continuity. The TLC1079ID is Last Time Buy status. Both devices operate across the 3V to 16V supply range required by the TS27L4ACD and support the 0°C to 70°C operating temperature range. The TLC1079 series exhibits lower slew rate (0.032V/µs) and superior input offset voltage (180µV) compared to the TS27L4ACD (900µV), representing improved performance characteristics. Supply current consumption is higher at 29µA per channel versus 10µA, a trade-off for enhanced performance.
The TLC27L4AID (Texas Instruments, Last Time Buy) provides an alternative CMOS solution with extended temperature range (-40°C to 85°C) and improved input bias current (0.7pA). This device requires minimum 4V supply voltage, which may limit applicability in 3V-only designs.
Secondary Substitutes (General Purpose Amplifiers):
The TLC274 series (TLC274ACDR, TLC274AIDR, TLC274BCDR) represents general purpose amplifier alternatives. These devices share the 4-circuit, 14-SOIC package configuration and 3V to 16V supply range. The TLC274 series exhibits significantly higher slew rate (3.6V/µs) and gain bandwidth product (2.2MHz) compared to the TS27L4ACD, making them suitable for applications requiring faster signal processing. However, supply current consumption is substantially higher at 2.7mA per channel. The TLC274ACDR and TLC274BCDR are Active status products with established supply chains. The TLC274AIDR supports extended temperature range (-40°C to 85°C).
Compliance and Availability:
All substitute parts listed maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, consistent with the TS27L4ACD. Active status products (TLC1079IDR, TLC274ACDR, TLC274AIDR, TLC274BCDR) provide superior long-term availability compared to obsolete or Last Time Buy classifications.
Frequently Asked Questions (FAQ)
Q: Can the TLC1079IDR directly replace the TS27L4ACD in existing designs?
A: The TLC1079IDR is compatible from a package and pinout perspective (14-SOIC, 4-circuit CMOS amplifier). Both devices operate within the 3V to 16V supply range and support the 0°C to 70°C temperature range. The TLC1079IDR exhibits lower slew rate (0.032V/µs vs. 0.04V/µs) and improved input offset voltage (180µV vs. 900µV). Verification of application-specific performance requirements is necessary to confirm suitability.
Q: What is the difference between the TLC1079CD and TLC1079CDR variants?
A: The TLC1079CD is supplied in Tube packaging, while the TLC1079CDR is supplied in Tape & Reel (TR) format. Both variants are electrically identical with identical electrical specifications. The packaging difference affects handling, storage, and automated assembly compatibility. The TLC1079CDR is Last Time Buy status, while TLC1079CD is Active.
Q: Why do the TLC274 series devices have higher supply current consumption?
A: The TLC274 series are general purpose amplifiers with higher slew rate (3.6V/µs) and gain bandwidth product (2.2MHz) compared to the TS27L4ACD CMOS amplifier (0.04V/µs, 100kHz). The increased performance specifications require higher quiescent current consumption (2.7mA per channel vs. 10µA). These devices are suitable for applications requiring faster signal processing but are not recommended for ultra-low-power designs.
Q: Is the TLC27L4AID suitable for 3V supply applications?
A: The TLC27L4AID requires a minimum supply voltage of 4V, making it unsuitable for designs operating at 3V. The TS27L4ACD and TLC1079 series support 3V minimum supply voltage and are appropriate for 3V applications.
Q: What packaging options are available for substitute parts?
A: Substitute parts are available in multiple packaging formats: Tube (standard packaging for manual assembly), Tape & Reel (TR) for automated pick-and-place assembly, and Cut Tape (CT) & Digi-Reel® for mixed-volume applications. Package selection depends on production volume and assembly methodology. All variants maintain identical electrical specifications and 14-SOIC physical dimensions.
Q: Are all substitute parts RoHS3 compliant?
A: All substitute parts listed in this reference maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, consistent with the TS27L4ACD. This ensures compatibility with modern manufacturing processes and environmental regulations.
Q: Which substitute offers the best long-term availability?
A: The TLC1079IDR and TLC274ACDR are classified as Active product status, indicating ongoing production and long-term availability. These devices are recommended for new designs requiring extended supply continuity. Last Time Buy and Obsolete classifications indicate limited future availability.
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