Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Power Supplies - Board Mount > DC DC Converters

STMicroelectronics GS-R400V

Name: GS-R400V
Brand: STMicroelectronics
SKU: GS-R400V
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: GS-R400V

Manufacturer:: STMicroelectronics

Category:: DC DC Converters

Package:: Module

Datasheet:: GS-R400V.pdf

Description:: DC DC CONVERTER 5.1-40V

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,233

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

GS-R400V from SGS-THOMSON Microelectronics is a programmable step-down switching regulator with adjustable output voltage (5.1–40 V), 4 A max output current, 46 V max input voltage, and integrated soft-start, remote sense, and non-latching overload protection - used in industrial power supplies requiring stable high-current DC conversion.

For engineers reviewing the GS-R400V datasheet, GS-R400V pinout, GS-R400V application, or GS-R400V equivalent, key selection criteria include output voltage programming via external resistor (R_v = 2.67×(V_o/5.1 − 1) kΩ), remote sensing capability (±500 mV compensation), crowbar overvoltage protection (V_o × 1.25), thermal resistance (5 °C/W), and synchronization support (GS-R400VB only).

Technical Context

The GS-R400V implements a fixed-frequency (100 kHz) PWM-controlled buck topology with internal MOSFET switching and voltage-mode control. It supports remote voltage sensing via dedicated +Sense/–Sense pins (pins 10/9), enabling precise regulation at the load under up to 500 mV total wiring drop.

Protection architecture includes non-latching current limiting (5–8 A trip range), crowbar overvoltage shutdown (triggered at 125% nominal V_o), and soft-start (10–35 ms). Inhibit logic (pin 1) disables operation with TTL/CMOS-compatible high-level enable (2–5.5 V).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage Range	5.1 V to 40 V, set by resistor between Pin 12 and Pin 10 per R_v = 2.67×(V_o/5.1 − 1) kΩ
Max Input Voltage	46 V DC, absolute max 48 V - requires external low-ESR input capacitor (22 µF ceramic or ≥2.5 A_{RMS, 50 V)}
Output Current	Up to 4 A continuous - derating required above 36 V output or at high ambient temperature
Switching Frequency	100 kHz fixed - enables predictable EMI filtering and avoids audible noise
Thermal Resistance	5 °C/W case-to-ambient - surface rises 50 °C at 10 W dissipation; external heatsink needed for >10 W loss
Remote Sense Range	±500 mV total compensation - split equally across +Sense and –Sense lines; shielding recommended
Crowbar Threshold	V_o × 1.25 - hard short-circuit of output to ground when exceeded, with <5 µs response

Pinout & Package

GS-R400V uses a TO-220-based metal-can package with integral heatsink and isolated case (electrically floating), dimensions 40.6 × 25.4 × 10.2 mm (L×W×H), mounting via four corner pins. Case serves as EMI shield and thermal path.

Pin/Terminal	Circuit Role	Design Meaning
1	Inhibit	Active-high disable: ≥2 V disables regulator; ≤0.8 V enables; draws ≤500 µA at 5 V
3	+Input	Main DC input (46 V max); connects to external bulk capacitor
4	Input GND	Return for input source; internally tied to Pin 8
8	Output GND	Power return path for regulated output; shared with Pin 4
9	–Sense	Remote load return reference; tie to Pin 8 if remote sensing unused
10	+Sense	Remote load high-side reference; tie to Pin 11 if remote sensing unused
11	+Output	Regulated DC output (5.1–40 V); current path up to 4 A
12	Program	Voltage-setting node: resistor to Pin 10 defines V_o; layout must minimize noise pickup

Key Features

Feature	Design Value
Programmable Output Voltage	5.1–40 V via single external resistor (Pin 12→10), enabling one module to serve multiple rail requirements
Remote Voltage Sensing	±500 mV compensation range with dedicated +Sense/–Sense pins, maintaining ±2% regulation at load despite PCB trace IR drop
Crowbar Overvoltage Protection	Hardware-level short-circuit activation at V_o × 1.25 with <5 µs response, protecting downstream logic from catastrophic overvoltage
Soft-Start Timing	10–35 ms controlled ramp-up prevents inrush current spikes into capacitive loads and stabilizes feedback loop startup
Non-Latching Overload Recovery	Auto-retry cycle on overcurrent: disable → wait → soft restart until fault clears, avoiding manual reset in field-deployed systems

Applications

Industrial Programmable Power Supply

Test Equipment DC Source

Use Scenario: Benchtop or rack-mounted power supply with user-adjustable output voltage (5–40 V) and current monitoring.

IC Role / Device Role / Timing Role: Primary DC-DC converter delivering stable, remotely sensed output with programmable setpoint and crowbar safety.

Use Value: Eliminates need for multiple fixed-output modules; remote sense ensures accuracy at DUT terminals despite cabling losses.

Use Scenario: Automated test system supplying variable bias to analog circuits, sensors, or RF front-ends.

IC Role / Device Role / Timing Role: High-current, low-noise step-down regulator synchronized to system clock via optional master-slave configuration (GS-R400VB).

Use Value: 100 kHz fixed frequency simplifies EMI filter design; soft-start prevents transient glitches during test sequence transitions.

Embedded Control System Power

Motor Drive Auxiliary Supply

Use Scenario: On-board 24 V or 36 V auxiliary rail generation for PLC I/O modules, microcontrollers, and isolation interfaces.

IC Role / Device Role / Timing Role: Main 4 A power stage converting unregulated 48 V bus to tightly regulated logic/motor driver supply.

Use Value: Integral heatsink and 5 °C/W thermal resistance allow convection cooling in sealed enclosures up to ~10 W dissipation.

Use Scenario: Gate driver and logic supply in 24–40 V BLDC motor inverters where input ripple and transient immunity are critical.

IC Role / Device Role / Timing Role: Regulated auxiliary rail with crowbar protection preventing gate oxide damage during bus transients or shoot-through faults.

Use Value: Hardware-level overvoltage cutoff (<5 µs) reacts faster than controller-based shutdown, preserving MOSFET reliability.

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable step-down regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2596HV	Fixed 1.23 V feedback reference; requires external resistor divider for programmability; no crowbar protection	Lacks hardware overvoltage cutoff and remote sense compensation; lower max input (60 V) but no integrated heatsink	Choose for cost-sensitive designs where crowbar safety and precision remote sensing are not required
TPS544B25	Digital PMBus interface; 2.95–18 V input; 0.6–5.5 V output; integrated FETs; no crowbar or inhibit logic	Requires external MCU for configuration; limited to lower voltage rails; no direct analog inhibit or reset functions	Prefer for digitally managed multi-rail systems needing telemetry, not for standalone high-voltage analog control

Compared with LM2596HV and TPS544B25, the GS-R400V uniquely combines high-voltage programmability (5.1–40 V), crowbar overvoltage protection, and true remote sense in a thermally optimized metal-can package - making it suitable where safety-critical analog regulation and field-replaceable simplicity outweigh digital configurability.

Availability

GS-R400V is available at Aetrix Electronics and suitable for industrial programmable power supplies, test equipment DC sources, embedded control system power, and motor drive auxiliary supplies requiring stable component supply and long-term obsolescence management.

Supply support for GS-R400V 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

SGS-THOMSON Microelectronics (now STMicroelectronics) is a European semiconductor manufacturer founded in 1987, specializing in power management, analog, and automotive ICs.

The GS-R400 family was designed for high-reliability industrial DC-DC conversion, targeting applications needing ruggedized, heatsink-integrated regulators with analog programmability and hardware-level fault protection - before digital PMBus control became mainstream.

FAQ

What is the minimum output voltage achievable with the GS-R400V?

The GS-R400V has a guaranteed minimum output voltage of 5.1 V, as confirmed by its selection chart and electrical characteristics table. This is not a typical "adjust down to 0 V" regulator - the internal reference and control architecture fix the lower bound at 5.1 V, matching the GS-R405 fixed variant. Attempting lower values violates specification and risks instability.

Can the GS-R400V be synchronized to an external clock?

No - the GS-R400V lacks synchronization capability. Only the GS-R400VB variant includes Oscillator (Pin 5) and Sync (Pin 6) pins for master-slave operation. The GS-R400V operates at a fixed 100 kHz internal oscillator frequency with no external clock input or phase-lock option.

Is remote sense mandatory, or can it be disabled?

Remote sense is optional. To disable it, tie Pin 9 (–Sense) directly to Pin 8 (Output GND) and Pin 10 (+Sense) directly to Pin 11 (+Output), as specified in Figure 1 of the datasheet. Leaving sense pins floating will cause regulation failure or oscillation.

Does the GS-R400V require an external input capacitor, and what type is recommended?

Yes - an external low-ESR, high-ripple-current input capacitor is mandatory. Recommended types include 22 µF multilayer ceramic (if space-constrained) or aluminum polymer/electrolytic with ≥2.5 A_{RMS ripple rating, 50 V rating, and ≤0.1 Ω ESR at 100 kHz. The internal capacitor alone cannot handle high-frequency ripple and may fail without this external support.}

GS-R400V Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: GS-R400

Package/Case:: Module

Packaging:: Bulk

Product Status:: Obsolete

Type:: Non-Isolated PoL Module

Number of Outputs:: 1

Voltage - Input (Min):: 9V

Voltage - Input (Max):: 46V

Voltage - Output 1:: 5.1 ~ 40V

Voltage - Output 2:: -

Voltage - Output 3:: -

Voltage - Output 4:: -

Current - Output (Max):: 4A

Power (Watts):: -

Voltage - Isolation:: -

Applications:: ITE (Commercial)

Features:: -

Operating Temperature:: -20°C ~ 85°C

Efficiency:: 90%

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: -

Control Features:: -

Approval Agency:: -

Standard Number:: -

GS-R400V FAQ

1.How can I place an order for GS-R400V through Aetrix?

Please submit a Request for Quotation (RFQ) for GS-R400V 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 GS-R400V reliable?

The price and inventory of GS-R400V are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for GS-R400V is usually 5 days.

3.What payment methods are accepted for GS-R400V?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for GS-R400V transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for GS-R400V?

GS-R400V orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your GS-R400V 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 GS-R400V?

For technical support, including GS-R400V datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your GS-R400V requirements.

6.How does Aetrix verify that GS-R400V is sourced from the original manufacturer or authorized distributors?

All GS-R400V 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 GS-R400V meets industry standards.

7.What is the process for return or replacement of GS-R400V?

All GS-R400V units undergo pre-shipment inspection (PSI). If there is an issue with GS-R400V, 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 GS-R400V part is unused and in its original packaging.

Return procedure for GS-R400V:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…