TS951IN - 3MHz Rail-to-Rail Op Amp | STMicroelectronics
MPN: TS951IN ✓ ActiveTS951IN Overview
An operational amplifier is an active analog component that amplifies the difference between its inverting and non-inverting inputs. The TS951IN belongs to the rail-to-rail operational-amplifier category and uses a BiCMOS process that combines CMOS input characteristics with bipolar output-drive capability. Rail-to-rail input common-mode range allows the amplifier to sense signals near the positive and negative supply rails, while rail-to-rail output swing improves dynamic range when the available supply voltage is limited.
Key electrical characteristics include a 3 MHz gain-bandwidth product, 1 V/µs slew rate, and approximately 0.9 mA supply current at 3 V. The 3 MHz bandwidth provides useful speed for audio-frequency buffers, general-purpose signal amplification, active filters, and sensor interfaces, while the 1 V/µs slew rate permits relatively rapid output transitions. The 8-DIP package supports straightforward through-hole assembly and is suitable for prototypes, educational platforms, and applications where a larger package is acceptable.
The TS951IN is built for general-purpose precision and moderate-speed analog work. Its single-amplifier configuration simplifies designs that require one independent signal path, while the low-power operating mode can reduce total system consumption in battery-powered equipment. Because a bipolar output stage is present, careful assessment of output-current capability, capacitive-load stability, and operating temperature is appropriate before assigning it to demanding loads.
Typical applications include low-frequency audio buffer stages, sensor-signal conditioning, active filters, data-acquisition front ends, portable instrumentation, and general analog signal conditioning. The rail-to-rail input capability is especially useful when sensor outputs can approach either supply rail. The rail-to-rail output stage is beneficial in low-voltage systems where a conventional amplifier would clip before approaching the available output range.
When designing with the TS951IN, keep feedback routing short, place compensation and decoupling components close to the device, and verify stability with the actual source impedance and load. Connect the unused input to a defined reference potential, normally the non-inverting input or a mid-supply bias point. Do not substitute a modern CMOS or rail-to-rail amplifier without checking input offset, bias-current, noise, output-drive, and supply-current differences.
This page combines manufacturer family information, distributor identification, package information, and practical design guidance with a parameter comparison against same-package family alternatives. It also distinguishes the TS951IN from the TS952 and TS954 family members, whose electrical characteristics must be checked against the manufacturer datasheet before making a board-level substitution.
Drop-in alternatives for TS951IN — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TS951IN (same form factor and footprint) — differing in Package, Input Common-Mode Range, Amplifier Type, Output Voltage Swing, Slew Rate.
TS951ID
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →TS952IN
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →TS952ID
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →TS954IN
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →TS954ID
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →TS951IN Maximum Ratings & Electrical Characteristics
| Amplifier Type | General-purpose operational amplifier |
| Number of Circuits | 1 circuit |
| Technology | BiCMOS |
| Input Common-Mode Range | Rail-to-rail |
| Output Voltage Swing | Rail-to-rail |
| Gain-Bandwidth Product | 3 MHz |
| Slew Rate | 1 V/µs |
| Maximum Supply Voltage | 12 V |
| Optimized Supply Voltage | 3 V and 5 V |
| Supply Current | 0.9 mA at 3 V |
| ESD Protection | 2000 V |
| Package | 8-DIP (0.300 inch, 7.62 mm pitch) |
| Packaging | Tube |
| Mounting Type | Through-hole |
TS951IN Pin Configuration
| Pin 1 | NC — Not connected |
| Pin 2 | IN- — Inverting input |
| Pin 3 | IN+ — Non-inverting input |
| Pin 4 | V- — Negative supply voltage |
| Pin 5 | OFFSET NULL — Offset-voltage adjustment input |
| Pin 6 | OUT — Amplifier output |
| Pin 7 | V+ — Positive supply voltage |
| Pin 8 | NC — Not connected |
Typical Applications
TS951IN is suitable for 6 applications: Low-Voltage Sensor Signal Conditioning, Portable Instrumentation Front End, Active Audio Filters, Data-Acquisition Input Buffer, General Analog Buffering, Educational and Prototype Analog Circuits.
Low-Voltage Sensor Signal Conditioning
The TS951IN fits sensor interfaces whose output can move close to either supply rail because its input common-mode range is rail-to-rail. Place it in a non-inverting or differential conditioning stage when the sensor bandwidth is well below the device's 3 MHz gain-bandwidth product. The 0.9 mA supply current at 3 V is useful for portable instrumentation, while the 1 V/µs slew rate permits moderate output changes. Confirm the sensor's output range, required gain, and common-mode reference before finalizing the bias network, and verify that the 8-DIP footprint is acceptable for the target assembly.
Recommended
Portable Instrumentation Front End
The TS951IN is suitable for compact, battery-powered instrumentation because it consumes approximately 0.9 mA at a 3 V supply and supports 3 V-optimized operation. Its rail-to-rail input and output characteristics reduce the usable signal range lost to conventional amplifier headroom, which is valuable in compact analog measurement systems. The 3 MHz gain-bandwidth product is appropriate for low-frequency measurement and buffering, not precision instrumentation extending into the megahertz range. Use low-leakage input biasing, maintain predictable reference levels, and validate offset and noise after the selected gain configuration is established.
Recommended
Active Audio Filters
The TS951IN can implement active filters and audio-frequency buffer stages using its 3 MHz gain-bandwidth product and 1 V/µs slew rate. These characteristics provide ample loop bandwidth for common low-frequency filter sections while allowing output transitions suitable for moderate-amplitude audio signals. The rail-to-rail output helps preserve signal amplitude in 3 V or 5 V systems, although output-current capability and THD-related limits must be checked for the selected load. Keep the feedback network compact, place input and output grounding carefully, and confirm stability with the actual source and load impedances.
Recommended
Data-Acquisition Input Buffer
The TS951IN is appropriate as a moderate-speed input buffer in data-acquisition systems that need to handle sensor or divider outputs with limited headroom. Rail-to-rail input operation helps accommodate signals approaching the supply rails, and the 3 MHz bandwidth is sufficient for many low-rate acquisition chains when the source impedance is not excessive. The buffer isolates the source from the following converter or sampling network, but it does not replace the converter's required anti-alias and settling network. Verify input bias-current effects, output drive, converter input capacitance, and acquisition timing before using the amplifier on fast sampled signals.
Recommended
General Analog Buffering
The TS951IN provides a straightforward solution for impedance buffering, level translation within a supply range, and general-purpose analog gain stages. Rail-to-rail input and output behavior makes it useful when the available headroom is small, while its single-channel architecture avoids allocating two amplifiers when only one independent path is required. The 8-DIP package is convenient for prototypes, educational boards, repair assemblies, and through-hole industrial equipment. For precision or high-current applications, compare offset voltage, input bias current, output current, noise, and load stability before standardizing this device across multiple designs.
Recommended
Educational and Prototype Analog Circuits
The TS951IN is well suited to educational and prototype analog circuits because it combines rail-to-rail behavior, 3 MHz bandwidth, low-power operation, and a straightforward 8-DIP package. Students and engineers can use it to construct amplifier, comparator-interface, active-filter, and sensor-conditioning experiments without dealing with a very small package. The tube packaging also facilitates breadboard, perfboard, and through-hole prototype construction. Because it is a general-purpose amplifier rather than a precision laboratory reference, measurements involving nanovolt offsets, microvolt noise, very high source impedance, or exact rail-to-rail limits require additional instrumentation and datasheet review.
Recommended
Recommended Products Summary
Engineering reference data for TS951IN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TS951ID | TS952IN | TS952ID | TS954IN | TS954ID |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Package | 8-DIP (0.300 inch, 7.62 mm pitch) | 8-DIP (0.300 inch, 7.62 mm pitch) | 8-DIP (0.300 inch, 7.62 mm pitch) | 8-DIP (0.300 inch, 7.62 mm pitch) | 8-DIP (0.300 inch, 7.62 mm pitch) | 8-DIP (0.300 inch, 7.62 mm pitch) |
| Amplifier Family | TS951 | TS951 | TS952 | TS952 | TS954 | TS954 |
| Number of Circuits | 1 circuit | 1 circuit | 1 circuit | 1 circuit | 1 circuit | 1 circuit |
| Gain-Bandwidth Product | 3 MHz | 3 MHz | 3 MHz | 3 MHz | 3 MHz | 3 MHz |
| Slew Rate | 1 V/µs | 1 V/µs | 1 V/µs | 1 V/µs | 1 V/µs | 1 V/µs |
| Input Common-Mode Range | Rail-to-rail | Rail-to-rail | Rail-to-rail | Rail-to-rail | Rail-to-rail | Rail-to-rail |
| Output Voltage Swing | Rail-to-rail | Rail-to-rail | Rail-to-rail | Rail-to-rail | Rail-to-rail | Rail-to-rail |
| Offset-Voltage Variant | TS951 general-purpose variant | TS951 general-purpose variant | TS952 offset variant | TS952 offset variant | TS954 low-offset variant | TS954 low-offset variant |
Key Differentiators
- Low-power 3 V operation (vs TS951ID)
- Same-package offset-variant choices (vs TS954IN)
- Through-hole 8-DIP assembly compatibility (vs TS952IN)
Design Notes
Route the inverting-input feedback connection as a short, compact loop and avoid routing it beside high-current or high-impedance input nets. The 3 MHz gain-bandwidth product makes stray capacitance in the feedback node capable of affecting stability or closed-loop response. Place feedback and gain-setting components close to the relevant pins, connect the bypass capacitor directly to the supply terminals, and keep the unused input connected to a defined reference potential.
Do not treat the TS951ID, TS952, or TS954 family variants as exact equivalents without checking the electrical table. The shared 8-DIP footprint simplifies board substitution, but offset voltage, noise, input bias current, common-mode rejection, and temperature grade can differ by family and suffix. Verify those limits against the original design, recalibrate offset-sensitive gain stages, and confirm the correct manufacturer orderable part number before production release.
The manufacturer identifies the TS951 family as optimized for 3 V and 5 V operation, with approximately 0.9 mA supply current at 3 V. Use a supply within the family operating range and provide local high-frequency decoupling at the V+ and V- pins. If operating at 12 V, check output swing, load current, package dissipation, and absolute maximum limits because the device is not characterized equally at every supply voltage.
Compliance Information
The manufacturer datasheet identifies the device as an industrial general-purpose operational amplifier, but no explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations were established for this record.
