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Home > Products > Integrated Circuits (ICs) > Linear > Special Purpose Amplifiers

STMicroelectronics TSM103AIDT

Name: TSM103AIDT
Brand: STMicroelectronics
SKU: TSM103AIDT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TSM103AIDT

Manufacturer:: STMicroelectronics

Category:: Special Purpose Amplifiers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: TSM103AIDT.pdf

Description:: IC AMPLIFIER 8SO

Quantity:: RFQ Add To RFQ list

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Inventory:3,316

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Product details

Overview

TSM103AIDT from STMicroelectronics is a dual operational amplifier with integrated 2.5V voltage reference, featuring 0.5mV typical input offset voltage (TSM103A grade), 0.9MHz unity-gain bandwidth, 350µA per op-amp supply current at 5V, rail-to-rail output swing (0V to V_CC–1.5V), and ±1.5V to ±16V dual-supply capability. It serves as a compact analog front-end for power supply monitoring and feedback loops in industrial DC-DC converters.

For engineers reviewing the TSM103AIDT datasheet, TSM103AIDT pinout, TSM103AIDT application, or TSM103AIDT equivalent, key selection criteria include its dual-op-amp + reference integration, guaranteed 0.4% reference accuracy over temperature, low quiescent current, and SO8 package compatibility with space-constrained PCB layouts in legacy power management designs.

Technical Context

The device integrates two independent amplifiers: OP1 has its non-inverting input internally tied to a precision 2.5V bandgap reference, enabling immediate use as an error amplifier in voltage regulation circuits; OP2 is fully independent with standard differential inputs. Both amplifiers share common supply rails and operate across 3–32V single or ±1.5–±16V dual supplies.

Reference performance is characterized by 0.2Ω typical dynamic impedance, 1–100mA sink current capability, and ±30mV max deviation over –40°C to +105°C. Amplifier specifications are specified separately for each op-amp under identical test conditions, confirming matched AC/DC behavior despite functional asymmetry.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Offset Voltage (OP1 & OP2)	0.5 mV typ. - enables accurate error sensing in <1% regulation loops without external trimming
Unity-Gain Bandwidth	0.9 MHz - supports stable closed-loop response up to ~100 kHz in typical feedback configurations
Supply Current per Op-Amp	350 µA @ 5V - allows operation in low-power systems with <1 mA total analog bias current
Output Voltage Swing	0 V to (V_CC – 1.5 V) - delivers full-range signal headroom near ground while maintaining drive into 2 kΩ loads
Reference Voltage Accuracy	±0.4% @ 25°C (TSM103A) - ensures precise threshold setting for overvoltage/undervoltage detection circuits
Reference Dynamic Impedance	0.2 Ω typ. - minimizes load-induced reference drift when sinking up to 100 mA
Common-Mode Input Range	Includes ground (0 V) - permits direct sensing of single-ended signals referenced to system GND

Pinout & Package

Package: SO8 (Plastic Micropackage), 8-pin small outline, surface-mount, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1	Output 1 (OP1)	Amplifier 1 output; connected to internal 2.5V reference non-inverting input
2	V_CC+	Positive supply rail for both op-amps and reference; accepts 3–32 V single or ±1.5–±16 V dual
3	Non-inverting Input 1	Internally wired to 2.5V reference - not externally accessible; defines OP1's fixed reference node
4	Inverting Input 1	Feedback input for OP1; used to close loop around internal reference for error amplification
5	Output 2 (OP2)	Fully independent amplifier output; usable as comparator, buffer, or signal conditioner
6	Non-inverting Input 2	Standard high-impedance input for OP2; supports ground-referenced or level-shifted signals
7	Inverting Input 2	Differential input for OP2; configurable for inverting gain stages or active filters
8	V_CC−	Negative supply rail (GND in single-supply mode); completes bias path for both amplifiers and reference

Key Features

Feature	Design Value
Dual op-amp + 2.5V reference in one SO8	Reduces BOM count and PCB area vs. discrete op-amp + shunt reference solutions
0.4% reference accuracy (TSM103A)	Eliminates need for external calibration in mid-precision voltage monitoring applications
Ground-sensing input common-mode range	Enables direct interface with low-side current sense amplifiers or battery terminals
1–100 mA reference sink capability	Supports direct driving of optocoupler LEDs or transistor bases without external pass devices
Low 350 µA/op-amp supply current	Permits continuous operation in always-on auxiliary supplies with minimal standby loss

Applications

Switch-Mode Power Supply Feedback

Industrial Sensor Signal Conditioning

Use Scenario: Closed-loop voltage regulation in isolated flyback or forward converters using optocoupler feedback.

IC Role / Device Role / Timing Role: OP1 acts as error amplifier comparing sensed output against internal 2.5V reference; OP2 buffers or filters auxiliary signals.

Use Value: Integrated reference eliminates external Zener tolerance stack-up, improving long-term output stability within ±1%.

Use Scenario: Amplifying low-level bridge sensor outputs (e.g., pressure or load cells) in PLC analog input modules.

IC Role / Device Role / Timing Role: OP2 provides programmable gain; OP1 supplies stable excitation reference or offset correction.

Use Value: Matched thermal drift between reference and OP1 input reduces zero-error drift over temperature.

Battery Management System Monitoring

Legacy Industrial DAC Output Buffering

Use Scenario: Cell voltage supervision and charge termination logic in 12V lead-acid or multi-cell Li-ion packs.

IC Role / Device Role / Timing Role: Reference sets overvoltage thresholds; OP2 compares cell voltage against scaled reference.

Use Value: 0.2Ω reference impedance ensures stable trip points even with varying comparator input bias currents.

Use Scenario: Buffering and level-shifting 0–5 V DAC outputs to drive ±10 V actuator interfaces in motion control systems.

IC Role / Device Role / Timing Role: OP2 configured as unity-gain inverter or level translator; reference provides bias point for bipolar output swing.

Use Value: Rail-to-rail output swing (0 V to V_CC–1.5 V) enables full-scale utilization of DAC resolution without clipping.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV431AIDBZR	Single adjustable shunt reference only; no integrated op-amps	Requires external op-amps for error amplification; higher component count	Preferred when reference flexibility (adjustable V_REF) outweighs integration benefit
LM358DR	Dual op-amp only; no internal reference; higher V_OS (2 mV typ.) and lower precision	Suitable only with external precision reference; less accurate regulation without trimming	Chosen for cost-sensitive, non-critical applications where ±2% regulation is acceptable

Compared with TLV431AIDBZR and LM358DR, TSM103AIDT uniquely combines matched op-amp and reference characteristics in one die-reducing layout sensitivity, thermal mismatch, and calibration effort-making it optimal for compact, stable feedback designs where board space and long-term accuracy are constrained.

Availability

TSM103AIDT is available at Aetrix Electronics and suitable for switch-mode power supply feedback, industrial sensor signal conditioning, battery management system monitoring, and legacy industrial DAC output buffering requiring stable component supply and long-lifecycle support.

Supply support for TSM103AIDT 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 microcontrollers, power ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The TSM103 series belongs to ST's legacy analog power management portfolio, engineered specifically for cost- and space-constrained feedback and monitoring functions in DC-DC converters and industrial control systems.

FAQ

Is TSM103AIDT still recommended for new designs?

No. STMicroelectronics explicitly marks TSM103/A as "NOT FOR NEW DESIGN" and states it is replaced by TSM103W. TSM103AIDT remains available for legacy support and repair, but new projects should evaluate TSM103W for improved specifications and extended lifecycle assurance.

Can the internal 2.5V reference be used independently of OP1?

Yes. The 2.5V reference node is accessible at Pin 3 (non-inverting input of OP1), though it is not buffered. It can source/sink 1–100 mA with ≤0.2Ω dynamic impedance, making it suitable for driving external comparators or ADC reference inputs-provided load current stays within specification and does not degrade reference accuracy.

What is the maximum safe supply voltage for continuous operation?

The absolute maximum supply voltage is 36 V, but continuous operation above 32 V is not recommended. Electrical characteristics are guaranteed only up to 32 V (single supply) or ±16 V (dual supply), and thermal dissipation in SO8 exceeds safe limits beyond that under typical load conditions.

Does TSM103AIDT support rail-to-rail input?

No. While the input common-mode range includes ground (0 V), the upper limit is V_CC+ – 1.5 V. Neither op-amp supports true rail-to-rail input; inputs must remain ≥0.3 V below V_CC+ to avoid phase reversal or increased offset error, per datasheet Note 1.

TSM103AIDT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Type:: Amplifier

Applications:: Power Management

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 8-SOIC

TSM103AIDT FAQ

1.How can I place an order for TSM103AIDT through Aetrix?

Please submit a Request for Quotation (RFQ) for TSM103AIDT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TSM103AIDT reliable?

The price and inventory of TSM103AIDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TSM103AIDT is usually 5 days.

3.What payment methods are accepted for TSM103AIDT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TSM103AIDT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TSM103AIDT?

TSM103AIDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TSM103AIDT order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TSM103AIDT?

For technical support, including TSM103AIDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TSM103AIDT requirements.

6.How does Aetrix verify that TSM103AIDT is sourced from the original manufacturer or authorized distributors?

All TSM103AIDT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TSM103AIDT meets industry standards.

7.What is the process for return or replacement of TSM103AIDT?

All TSM103AIDT units undergo pre-shipment inspection (PSI). If there is an issue with TSM103AIDT, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TSM103AIDT part is unused and in its original packaging.

Return procedure for TSM103AIDT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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