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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Texas Instruments UC2903DWTR

Name: UC2903DWTR
Brand: Texas Instruments
SKU: UC2903DWTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UC2903DWTR

Manufacturer:: Texas Instruments

Category:: Supervisors

Package:: 18-SOIC (0.295", 7.50mm Width)

Datasheet:: UC2903DWTR.pdf

Description:: IC SUPERVISOR 4 CHANNEL 18SOIC

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Product details

Overview

UC2903DWTR from Texas Instruments is a quad supply and line monitor IC designed for industrial power system supervision. It monitors up to four independent voltage rails-including one negative rail via internal inverter-with programmable under- and over-voltage thresholds centered on a 2.5-V precision reference, 8–40-V supply operation, and three >30-mA open-collector fault outputs (UV, OV, POWER OK) used in telecom power shelves and server PSUs.

For engineers reviewing the UC2903DWTR datasheet, UC2903DWTR pinout, UC2903DWTR application, or UC2903DWTR equivalent, key selection criteria include its –40°C to +85°C operating temperature range, proportional hysteresis scaling with window adjust voltage, line/switcher sense input for early failure warning, and integrated general-purpose op-amp for auxiliary feedback conditioning.

Technical Context

The UC2903DWTR implements a fault window architecture where OV and UV thresholds are generated as symmetric offsets around the 2.5-V internal reference, with magnitude set by the voltage applied to Pin 4 (WINDOW ADJUST). Threshold hysteresis scales proportionally at 10–30 mV/V across the adjust voltage range.

It integrates a dedicated inverting amplifier on Sense 4 for direct negative supply monitoring and a standalone general-purpose op-amp (20-mA source capability, ±40-mA sink) usable for error amplification or signal conditioning. The LINE/SWITCHER SENSE input features a 2.0-V threshold with 175-mV hysteresis for early AC/DC or DC/DC converter fault detection.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	8 V to 40 V - supports wide-input industrial and telecom power supplies without external regulators.
Reference Output	2.5 V ±15 mV - stable, low-drift reference used to center all fault thresholds and scale external dividers.
Fault Threshold Hysteresis	10–30 mV/V of window adjust voltage - ensures glitch-free response during slow-ramping faults.
Open-Collector Output Sink	>30 mA per output - drives LEDs, optocouplers, or logic inputs directly without external buffers.
Operating Temperature	–40°C to +85°C - qualified for commercial/industrial environments, distinct from UC1903 (–55°C to +125°C) and UC3903 (0°C to +70°C).
Standby Current	7 mA typical - enables low-power supervision in always-on systems without significant overhead.
Line Sense Threshold	2.0 V ±60 mV - detects loss of primary-side switching activity before secondary outputs collapse.

Pinout & Package

UC2903DWTR is packaged in an 18-pin SOIC (DW) body with 0.300-inch width, RoHS-compliant lead finish, and moisture sensitivity level not applicable per TI documentation.

Pin/Terminal	Circuit Role	Design Meaning
+VIN	Main supply input	Power source for internal circuitry; must be ≥8 V for full functionality and ≥3 V for POWER OK assertion.
V_REF (Pin 2)	Precision reference output	2.5-V buffered reference used to bias external resistor dividers for sense inputs and window adjustment.
GND (Pin 3)	Analog/digital ground reference	Common return for all internal comparators, op-amps, and reference; requires low-impedance connection.
WINDOW ADJUST (Pin 4)	Fault window magnitude control	Voltage (0.5–2.5 V) sets proportional offset from V_REF for both OV and UV thresholds.
SENSE 4 INVERT INPUT (Pin 5)	Inverter non-inverting input	Used with Sense 4 to monitor negative supplies; tied high to disable inversion for positive-sense use.
SENSE 4 (Pin 6)	Inverted sense input	Accepts inverted signal from Pin 5; enables direct monitoring of negative rails like –12 V or –5 V.
SENSE 3 (Pin 7)	Third positive sense input	Monitors third rail (e.g., +3.3 V); clamped to prevent damage during overvoltage transients.
SENSE 2 (Pin 8)	Second positive sense input	Monitors second rail (e.g., +5 V); shares same fault window scaling as SENSE 1–4 unless externally modified.
SENSE 1 (Pin 9)	First positive sense input	Primary sense channel; internally clamped with 2-kΩ resistor and zener for robustness.
LINE/SWITCHER SENSE (Pin 15)	Early failure detection input	Triggers POWER OK deassertion when voltage drops below 2.0 V, indicating upstream converter failure.
POWER OK (Pin 16)	Active-low status output	Low = all monitored rails within window and line sense valid; open-drain, requires pull-up.
UV FAULT (Pin 17)	Under-voltage fault indicator	Active-low output with user-programmable delay; asserts after UV condition persists beyond capacitor-charged timing.
OV FAULT (Pin 18)	Over-voltage fault indicator	Active-low output with independent delay; asserts only when sense input exceeds upper threshold.

Key Features

Feature	Design Value
Four independent voltage monitoring channels	Enables consolidated supervision of multi-rail systems (e.g., +12 V, +5 V, +3.3 V, –12 V) with single IC, reducing BOM count and layout area.
Programmable fault window with proportional hysteresis	Allows precise tuning of trip points and noise immunity across all rails using one adjust pin and resistive dividers referenced to V_REF.
Dedicated Sense 4 inverter	Eliminates need for external inverting op-amp when monitoring negative supplies-reduces component count and improves accuracy.
Integrated general-purpose op-amp	Provides 20-mA source / 40-mA sink capability for closed-loop feedback, error amplification, or signal conditioning without external amplifiers.
Line/switcher sense input with hysteresis	Delivers predictive failure detection by monitoring primary-side switching activity, enabling graceful shutdown before secondary output collapse.

Applications

Telecom Power Shelf Supervision	Industrial PLC Power Management
Use Scenario: Monitoring +48 V DC input, +12 V, +5 V, and –12 V rails in a distributed telecom shelf with hot-swap capability. IC Role / Device Role / Timing Role: UC2903DWTR acts as centralized fault supervisor, asserting POWER OK only when all rails are stable and detecting early switcher failure via LINE/SWITCHER SENSE. Use Value: Prevents downstream system lockup by disabling load before undervoltage or overvoltage propagates; reduces need for discrete supervisors per rail.	Use Scenario: Supervising redundant 24 V DC power inputs and internal +5 V, +3.3 V logic rails in a programmable logic controller backplane. IC Role / Device Role / Timing Role: UC2903DWTR provides rail-specific UV/OV fault flags with independent delays, while its G.P. op-amp conditions isolated feedback signals from current sensors. Use Value: Enables deterministic fault response with configurable timing, improving system diagnostics and reducing MTTR in mission-critical automation.
Server PSU Redundancy Control	Medical Imaging Power Sequencing
Use Scenario: Coordinating dual 12 V ATX PSUs in a rack server, verifying both outputs before enabling motherboard power delivery. IC Role / Device Role / Timing Role: UC2903DWTR monitors each PSU's +12 V, +5 V, +3.3 V, and –12 V (if present), using POWER OK to gate enable signals and UV/OV outputs for fault logging. Use Value: Ensures synchronized power-up and graceful failover; eliminates risk of partial rail activation that could damage sensitive ASICs.	Use Scenario: Managing sequencing and fault tolerance for high-voltage X-ray generator supplies (+200 V, +15 V, +5 V, –15 V) in MRI or CT scanner subsystems. IC Role / Device Role / Timing Role: UC2903DWTR supervises all rails with tight thresholds and uses its internal inverter to monitor negative bias supplies without external components. Use Value: Guarantees safe ramp-up/down sequences and immediate shutdown on overvoltage-critical for patient safety and regulatory compliance (IEC 62304).

Telecom Power Shelf Supervision

Industrial PLC Power Management

Use Scenario: Monitoring +48 V DC input, +12 V, +5 V, and –12 V rails in a distributed telecom shelf with hot-swap capability.

IC Role / Device Role / Timing Role: UC2903DWTR acts as centralized fault supervisor, asserting POWER OK only when all rails are stable and detecting early switcher failure via LINE/SWITCHER SENSE.

Use Value: Prevents downstream system lockup by disabling load before undervoltage or overvoltage propagates; reduces need for discrete supervisors per rail.

Use Scenario: Supervising redundant 24 V DC power inputs and internal +5 V, +3.3 V logic rails in a programmable logic controller backplane.

IC Role / Device Role / Timing Role: UC2903DWTR provides rail-specific UV/OV fault flags with independent delays, while its G.P. op-amp conditions isolated feedback signals from current sensors.

Use Value: Enables deterministic fault response with configurable timing, improving system diagnostics and reducing MTTR in mission-critical automation.

Server PSU Redundancy Control

Medical Imaging Power Sequencing

Use Scenario: Coordinating dual 12 V ATX PSUs in a rack server, verifying both outputs before enabling motherboard power delivery.

IC Role / Device Role / Timing Role: UC2903DWTR monitors each PSU's +12 V, +5 V, +3.3 V, and –12 V (if present), using POWER OK to gate enable signals and UV/OV outputs for fault logging.

Use Value: Ensures synchronized power-up and graceful failover; eliminates risk of partial rail activation that could damage sensitive ASICs.

Use Scenario: Managing sequencing and fault tolerance for high-voltage X-ray generator supplies (+200 V, +15 V, +5 V, –15 V) in MRI or CT scanner subsystems.

IC Role / Device Role / Timing Role: UC2903DWTR supervises all rails with tight thresholds and uses its internal inverter to monitor negative bias supplies without external components.

Use Value: Guarantees safe ramp-up/down sequences and immediate shutdown on overvoltage-critical for patient safety and regulatory compliance (IEC 62304).

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad supply monitoring applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UC3903DW	0°C to +70°C temp range; lower-grade reference (±30 mV vs. ±15 mV); identical pinout and core functionality.	Suitable for cost-sensitive commercial equipment with ambient temperature constraints; not rated for extended industrial environments.	Select UC3903DW only if operating temperature stays within 0–70°C and reference tolerance relaxation is acceptable.
TPS3431DBVR	Single-channel, adjustable reset IC with 200-ms to 10-s delay; no multi-rail monitoring, no inverter, no op-amp; SOT-23-6 package.	Applicable only for basic single-rail reset generation-not a functional replacement for quad monitoring or negative rail sensing.	Use TPS3431DBVR only as a minimal-cost reset solution where UC2903DWTR's full feature set is unnecessary.

Compared with UC3903DW and TPS3431DBVR, the UC2903DWTR uniquely delivers industrial-temperature quad monitoring with negative rail support and auxiliary op-amp-making it irreplaceable in complex, multi-supply systems requiring coordinated fault response and analog signal conditioning.

Availability

UC2903DWTR is available at Aetrix Electronics and suitable for telecom power shelves, industrial PLCs, server PSUs, and medical imaging systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for UC2903DWTR 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

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets since 1930.

The UC2903DWTR belongs to TI's legacy power management supervisor family, engineered specifically for high-reliability, multi-rail voltage monitoring in industrial and telecom infrastructure where predictable fault response and long-term availability are critical.

FAQ

What is the operating temperature range of the UC2903DWTR?

The UC2903DWTR is specified for operation from –40°C to +85°C, distinguishing it from the UC1903 (–55°C to +125°C) and UC3903 (0°C to +70°C). This range makes UC2903DWTR suitable for commercial and industrial environments where extended thermal performance is required but military-grade specs are unnecessary. All electrical characteristics in the datasheet are guaranteed across this full range.

How does the WINDOW ADJUST pin (Pin 4) control fault thresholds in the UC2903DWTR?

The WINDOW ADJUST pin (Pin 4) sets the magnitude of the fault window symmetrically around the 2.5-V internal reference. A voltage between 0.5 V and 2.5 V applied here determines OV and UV thresholds as V_REF ± (V_ADJ × gain factor), with hysteresis scaling proportionally at 10–30 mV/V. This allows precise, resistor-based tuning of trip points for each monitored rail without recalibrating the entire system. The UC2903DWTR's bias cancellation circuit keeps Pin 4 input current low (<10 µA), enabling stable divider networks.

Can the UC2903DWTR monitor negative supply voltages, and how is this implemented?

Yes, the UC2903DWTR can monitor negative supply voltages using its dedicated Sense 4 inverter. By applying the negative rail to Pin 5 (SENSE 4 INVERT INPUT) and routing the emitter-follower output to Pin 6 (SENSE 4), the device converts the negative voltage into a positive-sense-compatible signal referenced to GND. When Pin 5 is held high, the inverter is disabled and Pin 6 functions as a standard positive sense input. This eliminates external inverting circuitry and maintains accuracy for rails such as –12 V or –5 V in telecom or industrial systems.

What is the function of the LINE/SWITCHER SENSE input on the UC2903DWTR?

The LINE/SWITCHER SENSE input (Pin 15) provides early warning of upstream power source failure by monitoring primary-side switching activity-such as rectified transformer output or gate-drive node voltage. It triggers the POWER OK output to go active-low when the input falls below 2.0 V (with 175-mV hysteresis), allowing system-level shutdown before secondary output collapse. This feature is essential in switched-mode supplies where hold-up time margins are tight, and enables predictive maintenance in telecom and server PSUs.

Does the UC2903DWTR include any auxiliary analog circuitry beyond voltage monitoring?

Yes, the UC2903DWTR integrates a fully independent general-purpose op-amp with 20-mA source and 40-mA sink capability, rail-to-rail input range (–0.3 V to +40 V), and 1-MHz unity-gain bandwidth. It is commonly used to condition feedback signals in isolated power supplies, buffer high-impedance sensor nodes, or implement comparator-based logic. Its output stage includes an NPN emitter follower (Q6) for sourcing and a substrate PNP (Q3) for sinking-enabling robust transient response in real-world loads.

UC2903DWTR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 18-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Multi-Voltage Supervisor

Number of Voltages Monitored:: 4

Voltage - Threshold:: Adjustable/Selectable

Output:: Open Drain or Open Collector

Reset:: Active Low

Reset Timeout:: Adjustable/Selectable

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 18-SOIC

UC2903DWTR FAQ

1.How can I place an order for UC2903DWTR through Aetrix?

Please submit a Request for Quotation (RFQ) for UC2903DWTR 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 UC2903DWTR reliable?

The price and inventory of UC2903DWTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2903DWTR is usually 5 days.

3.What payment methods are accepted for UC2903DWTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2903DWTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UC2903DWTR?

UC2903DWTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UC2903DWTR 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 UC2903DWTR?

For technical support, including UC2903DWTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2903DWTR requirements.

6.How does Aetrix verify that UC2903DWTR is sourced from the original manufacturer or authorized distributors?

All UC2903DWTR 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 UC2903DWTR meets industry standards.

7.What is the process for return or replacement of UC2903DWTR?

All UC2903DWTR units undergo pre-shipment inspection (PSI). If there is an issue with UC2903DWTR, 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 UC2903DWTR part is unused and in its original packaging.

Return procedure for UC2903DWTR:

1.Submit a request within 90 days.

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

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