STMicroelectronics TSM103WAID

Overview

TSM103WAID from STMicroelectronics is a dual operational amplifier with integrated 2.5V precision voltage reference, combining one independent op-amp and one reference-biased op-amp in a single SO-8 package. It delivers 0.5mV typical input offset voltage, 0.9MHz unity-gain bandwidth, ±0.4% reference accuracy at 25°C, 350µA/op supply current at 5V, and rail-to-rail compatible output swing (0V to VCC–1.5V), enabling use in precision power supply feedback and analog signal conditioning circuits.

For engineers reviewing the TSM103WAID datasheet, TSM103WAID pinout, TSM103WAID application, or TSM103WAID equivalent, key selection criteria include its dual-op-amp + reference integration, low drift (7µV/°C), sink capability up to 50mA, 0.2Ω dynamic reference impedance, and operation across 3–32V single-supply or ±1.5–±16V dual-supply rails.

Technical Context

The device integrates two functionally distinct amplifiers: Op-Amp 1 has its non-inverting input internally tied to a trimmed 2.5V bandgap reference, making it ideal for error amplification in adjustable voltage regulators; Op-Amp 2 operates as a fully independent general-purpose amplifier with standard differential inputs. Both share common supply pins and thermal substrate but maintain separate input/output paths.

Reference performance is specified over 1–100mA cathode current, with 0.2Ω typical dynamic impedance and ≤30mV total deviation over –40°C to +105°C. The op-amps feature input common-mode range extending to ground and up to VCC–1.5V, supporting single-supply sensor interface and level-shifting applications without external biasing.

Key Specifications

Pinout & Package

SO-8 plastic micropackage (package code: D), 1.27 mm pitch, 5.0 × 4.0 mm body, 1.75 mm max height, R_thJA = 175°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-op-amp-with-reference applications.

Compared with TL431ACDR and LM358DR, TSM103WAID uniquely combines reference and dual amplifiers in one SO-8 package, reducing component count and PCB area by ~40% in power supply feedback designs while maintaining ±0.4% reference accuracy and 0.9MHz bandwidth-critical for stable loop response in 100kHz-class converters.

Availability

TSM103WAID is available at Aetrix Electronics and suitable for switch-mode power supply feedback, industrial current monitoring, battery management system voltage sensing, and programmable power supply control requiring stable component supply across automotive-grade temperature ranges (–40°C to +105°C).

Supply support for TSM103WAID includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

TSM103WAID belongs to ST's precision analog power management portfolio, engineered specifically for cost-sensitive, space-constrained power supply supervision and feedback applications where integration of reference and dual amplifiers improves reliability and reduces design cycle time.

FAQ

What is the maximum cathode current the TSM103WAID reference can safely sink?

The TSM103WAID reference is rated for 1–100 mA cathode current under normal operation, with absolute maximum continuous cathode current of 150 mA. Sustained operation above 100 mA may exceed thermal limits in SO-8 packaging, especially above +85°C ambient. Derating is recommended per the 175°C/W junction-to-ambient thermal resistance.

Can Op-Amp 1 be used independently of the internal reference?

No - Op-Amp 1's non-inverting input is permanently wired to the internal 2.5V reference and cannot be externally disconnected or reconfigured. Only Op-Amp 2 offers fully independent inputs. This fixed topology optimizes Op-Amp 1 for error amplification in regulator feedback loops but precludes general-purpose use of that amplifier.

Does the TSM103WAID support true rail-to-rail output swing?

No - the output swing is specified as 0V to (VCC – 1.5V) for both amplifiers, meaning it does not reach the positive rail. At VCC = 30V, maximum output is 28.5V; at VCC = 5V, it is 3.5V. This limitation arises from the bipolar process and output stage architecture, and must be accounted for in low-headroom applications.

How does the TSM103WAID's reference accuracy compare between TSM103WA and TSM103W variants?

The TSM103WAID guarantees ±0.4% reference accuracy at 25°C and ±0.7% over full temperature range (–40°C to +105°C), whereas the base TSM103W variant specifies ±0.7% at 25°C and ±1.0% over temperature. The 'A' suffix denotes tighter initial trim and improved thermal stability, verified per ST's production test flow and documented in the Electrical Characteristics tables on pages 5–6 of the datasheet.