My Inquiry
My Account
STMicroelectronics GS-R405S
- Part No.:
- GS-R405S
- Manufacturer:
- STMicroelectronics
- Category:
- DC DC Converters
- Package:
- Module
- Datasheet:
-
GS-R405S.pdf
- Description:
- DC DC CONVERTER 5.1V
- Quantity:
- Payment:
- Shipping:
Inventory:1,736
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
GS-R405S from STMicroelectronics (formerly SGS-THOMSON) is a fixed-output 5.1 V, 4 A step-down switching regulator with integrated heatsink, 46 V max input, 25 mVpp output ripple, and dedicated reset output (pin 2) for system supervision. It delivers up to 20 W in industrial power supplies requiring stable low-noise DC/DC conversion.
For engineers reviewing the GS-R405S datasheet, GS-R405S pinout, GS-R405S application, or GS-R405S equivalent, key selection criteria include its 5.1 V ±2% output accuracy, remote sense capability, crowbar overvoltage protection at 1.25×Vo, soft-start timing (10–35 ms), and reset output logic compatibility with TTL/CMOS.
Technical Context
The GS-R405S implements a current-mode PWM controller with internal 100 kHz oscillator, non-latching overload protection, and crowbar-type overvoltage shutdown triggered at Vo × 1.25. Its thermal resistance is 5°C/W case-to-ambient, enabling 20 W operation without forced cooling under typical conditions.
It supports remote voltage sensing via dedicated +Sense (pin 10) and –Sense (pin 9) terminals, compensating up to ±500 mV total wiring drop. The inhibit pin (pin 1) accepts TTL/CMOS-compatible logic levels (0.8 V low, 2–5.5 V high) for external enable/disable control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.1 V ±2% - tightly regulated fixed output suitable for powering logic ICs and analog circuitry without external feedback components. |
| Max Input Voltage | 46 V DC - supports wide-input industrial bus rails including 24 V and 36 V systems with margin for ripple and transients. |
| Output Current | 4 A continuous - enables single-regulator solutions for mid-power embedded controllers and instrumentation subsystems. |
| Output Ripple | 25 mVpp at 2 A - low noise performance reduces need for post-regulation filtering in sensitive analog signal chains. |
| Reset Output | Open-collector sink, 20 mA max - provides synchronized power-good signaling to microcontrollers upon successful startup completion. |
| Soft Start Time | 10–35 ms - prevents inrush current surges during power-up, protecting upstream converters and input capacitors. |
| Crowbar Threshold | Vo × 1.25 - fast overvoltage shutdown (<5 µs delay) safeguards downstream loads against catastrophic failure. |
Pinout & Package
GS-R405S uses a metal-cased TO-220-12 package with integral heatsink and isolated case. Dimensions: 40.0 × 20.0 × 17.5 mm (L×W×H). Case is electrically isolated and may be grounded via corner mounting pins for EMI shielding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 Inhibit | Enable/disable control input | Active-low logic interface: <0.8 V enables, >2 V disables; draws ≤500 µA when high. |
| 2 Reset | Power-good open-collector output | Sinks up to 20 mA after soft-start completes; asserts low during fault or startup. |
| 3 +Input | Main DC input supply | Accepts 9–46 V DC; requires external low-ESR capacitor (≥22 µF ceramic or 2.5 ARMS electrolytic). |
| 4 Input GND | Input return path | Internally tied to pin 8; must be connected to system input ground plane with low-inductance layout. |
| 8 Output GND | Output return path | Internally connected to pin 4; serves as reference for regulated output and sense circuitry. |
| 9 –Sense | Remote load return sensing | Connects to load ground near point of use; ties to pin 8 if remote sensing unused. |
| 10 +Sense | Remote load high-side sensing | Connects to load VCC near point of use; ties to pin 11 if remote sensing unused. |
| 11 +Output | Regulated DC output | Delivers 5.1 V ±2% at up to 4 A; remote sense compensation range ±500 mV total. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Heatsink | Enables 20 W convection-cooled operation with 5°C/W thermal resistance-eliminates need for external heatsink in most enclosures. |
| Remote Voltage Sensing | Compensates for up to 500 mV total IR drop across power delivery traces-maintains ±2% regulation at load point. |
| Crowbar Overvoltage Protection | Triggers within 5 µs when output exceeds 6.375 V-prevents damage to downstream 5 V logic and memory devices. |
| Non-Latching Fault Recovery | Auto-retries after overload/short-circuit with soft-start-resumes normal operation once fault clears, no manual reset required. |
| TTL/CMOS-Compatible Inhibit | Supports direct interfacing with microcontroller GPIOs-no level-shifting needed for enable/disable sequencing. |
Applications
| Industrial PLC I/O Module | Test Equipment Power Subsystem |
|---|---|
Use Scenario: Powers digital I/O banks and isolation drivers in programmable logic controllers operating from 24 V DC field buses. IC Role / Device Role / Timing Role: Primary 5 V DC/DC converter delivering clean, regulated power with remote sense to compensate for backplane voltage drop. Use Value: Maintains 5.1 V ±2% at load despite 300 mV IR loss across 200 mm PCB traces-ensures reliable logic-level compatibility. | Use Scenario: Supplies 5 V to precision DACs, ADC references, and FPGA configuration circuitry in automated test equipment. IC Role / Device Role / Timing Role: Low-ripple (25 mVpp), thermally stable power source with crowbar protection to prevent measurement corruption during overvoltage events. Use Value: Prevents data corruption by cutting off output within 5 µs if output exceeds 6.375 V-protects 16-bit analog signal chain integrity. |
| Embedded Controller Power Supply | Motor Drive Logic Power Rail |
Use Scenario: Generates 5 V for ARM Cortex-M microcontrollers, CAN transceivers, and EEPROM in fanless edge gateways. IC Role / Device Role / Timing Role: Fixed-output buck regulator with integrated heatsink and reset output for coordinated boot sequencing. Use Value: Provides synchronized reset pulse to MCU after 10–35 ms soft-start-ensures deterministic firmware initialization timing. | Use Scenario: Powers gate drivers, current-sense amplifiers, and position encoder interfaces in brushless motor drives. IC Role / Device Role / Timing Role: Robust 4 A supply tolerant of 46 V bus transients, with non-latching overload recovery during stall conditions. Use Value: Survives repeated motor stall events by cycling into soft-start mode-avoids latch-up and enables autonomous recovery without host intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596T-5.0 | 3 A max output, no reset output, no remote sense, 40 V max input | Lacks system supervision and precision load-point regulation; suited for cost-sensitive consumer-grade designs | Select only if 3 A output and absence of reset/remote sense are acceptable |
| TPS5430DDAR | 3 A, adjustable output, 36 V max input, no crowbar protection, requires external feedback resistors | Requires design-in effort for 5.1 V setting; lacks integrated heatsink and overvoltage latch-off | Choose only when board space constraints preclude TO-220-12 footprint and adjustable output is preferred |
Compared with LM2596T-5.0 and TPS5430DDAR, the GS-R405S uniquely combines 4 A output, dedicated reset signaling, remote sense, and crowbar protection in a thermally optimized metal-package-making it irreplaceable for industrial systems demanding robustness and load-point accuracy.
Availability
GS-R405S is available at Aetrix Electronics and suitable for industrial PLCs, automated test equipment, embedded controller power supplies, and motor drive logic rails requiring stable component supply across extended product lifecycles.
Supply support for GS-R405S 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 specializing in power management, microcontrollers, and automotive ICs, with decades of heritage in high-reliability industrial components.
The GS-R400 family was designed for ruggedized, high-current DC/DC conversion in factory automation, process control, and instrumentation-emphasizing thermal resilience, EMI containment, and fault tolerance over compactness or ultra-high efficiency.
FAQ
What is the function of Pin 2 (Reset) on the GS-R405S?
Pin 2 is an open-collector reset output that sinks up to 20 mA after successful soft-start completion. It remains low during startup and fault conditions (overload, overvoltage), then goes high-impedance to allow external pull-up-providing a hardware-based power-good signal for microcontroller reset sequencing.
Can the GS-R405S operate without remote sensing connections?
Yes. When remote sensing is not used, +Sense (pin 10) must be tied directly to +Output (pin 11), and –Sense (pin 9) must be tied to Output GND (pin 8). This configures the regulator for local sensing, maintaining 5.1 V ±2% regulation at the module terminals.
What thermal management is required for full 4 A output?
At 4 A and 5.1 V output (20.4 W), with 46 V input (≈1.2 W dissipation), the module's 5°C/W thermal resistance results in ~6°C case rise above ambient. No external heatsink is needed below 60°C ambient; forced air or heatsink recommended above that or in enclosed spaces.
Does the GS-R405S support synchronization with other regulators?
No. Synchronization capability (via Oscillator/Sync pins) is exclusive to the GS-R400VB variant. The GS-R405S has no sync functionality-it operates autonomously with its internal 100 kHz oscillator and cannot be externally synchronized or daisy-chained.
GS-R405S 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:
- 5.1V
- 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:
- 70%
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- -
- Control Features:
- -
- Approval Agency:
- -
- Standard Number:
- -
GS-R405S FAQ
1.How can I place an order for GS-R405S through Aetrix?
Please submit a Request for Quotation (RFQ) for GS-R405S 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-R405S reliable?
The price and inventory of GS-R405S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for GS-R405S is usually 5 days.
3.What payment methods are accepted for GS-R405S?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for GS-R405S transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for GS-R405S?
GS-R405S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your GS-R405S 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-R405S?
For technical support, including GS-R405S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your GS-R405S requirements.
6.How does Aetrix verify that GS-R405S is sourced from the original manufacturer or authorized distributors?
All GS-R405S 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-R405S meets industry standards.
7.What is the process for return or replacement of GS-R405S?
All GS-R405S units undergo pre-shipment inspection (PSI). If there is an issue with GS-R405S, 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-R405S part is unused and in its original packaging.
Return procedure for GS-R405S:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
GS-R405S Tags
-
1S4E_0505S1.5U
GAPTEC Electronic
-
TPS631000DRLR
Texas Instruments
-
XCL209F083DR
Torex Semiconductor Ltd
-
SC202AMLTRT
Semtech Corporation
-
NME1S0505SC
Murata Power Solutions Inc.
-
XCL101A501ER-G
Torex Semiconductor Ltd
-
RFM-0505S
Recom Power
-
TEA 1-0505E
Traco Power
-
MIC33153YHJ-TR
Microchip Technology
-
TEA 1-0505
Traco Power
-
TPSM863252RDXR
Texas Instruments
-
RFB-0505S
Recom Power
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
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.
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.
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…
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…
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…
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 …
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…
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…
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…
