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Taiwan Semiconductor Corporation RS1GALH
- Part No.:
- RS1GALH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
RS1GALH.pdf
- Description:
- 150NS, 1A, 400V, FAST RECOVERY R
- Quantity:
- Payment:
- Shipping:
Inventory:28,000
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Product details
Overview
RS1GALH from Taiwan Semiconductor is a 1A, 400V fast recovery surface-mount rectifier in Thin SMA package, featuring 0.96V forward voltage at 0.5A/25°C, 150ns reverse recovery time, and AEC-Q101 qualification for automotive power conversion.
For engineers reviewing the RS1GALH datasheet, RS1GALH pinout, RS1GALH application, or RS1GALH equivalent, key selection factors include its 400V VRRM rating, 30A IFSM surge capability, glass-passivated junction, J-STD-020 Level 1 moisture sensitivity, and suitability for snubber and freewheeling circuits in compact DC/DC converters.
Technical Context
The RS1GALH is a single-die, unidirectional silicon rectifier optimized for high-frequency switching with low conduction loss and fast turn-off. Its 150ns trr and 7pF junction capacitance support efficient operation in 100kHz–500kHz DC/DC topologies.
Thermal performance is defined by RθJL = 19°C/W and RθJA = 81°C/W on a 5mm × 5mm Cu pad PCB, enabling reliable 1A continuous operation up to +175°C junction temperature under proper layout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 400 V - Maximum repetitive reverse voltage before breakdown; sets safe operating margin in 28V/48V automotive bus clamping |
| IF | 1 A - Continuous forward current rating; defines steady-state power handling in freewheeling diode applications |
| trr | 150 ns - Reverse recovery time at IF = 0.5A, IR = 1.0A; enables high-frequency switching with minimal switching loss |
| VF @ 1A/25°C | 0.97 V - Forward voltage drop; determines conduction loss (0.97W at 1A) and thermal load in compact layouts |
| RθJA | 81 °C/W - Junction-to-ambient thermal resistance on standard test board; used to calculate max ambient temp for 175°C TJ limit |
| Moisture Sensitivity | Level 1 per J-STD-020 - No floor life limitation; supports unlimited storage and standard reflow without baking |
Pinout & Package
Package: Thin SMA (JEDEC DO-221AC variation), low-profile surface-mount package with matte tin-plated leads, cathode indicated by band, 0.029g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential node (e.g., switch node in buck converter); requires adequate copper pour for thermal relief |
| Cathode | Current exit point during forward conduction; marked by band | Connected to higher-potential rail (e.g., output capacitor positive); polarity must be verified before placement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Glass passivated junction | Enhanced environmental robustness against humidity and contamination; eliminates need for conformal coating in harsh environments |
| Low profile Thin SMA package | Max height 1.45 mm - enables ultra-thin power modules and space-constrained automotive ECUs |
| Fast recovery (150 ns) | Reduces reverse recovery charge (Qrr) and associated switching losses in high-frequency synchronous rectification |
| Halogen-free & RoHS compliant | Meets EU Directive 2011/65/EU and IPC-1752A Tier 1 reporting requirements for green manufacturing |
Applications
| Automotive DC/DC Converters | Industrial Snubber Circuits |
|---|---|
Use Scenario: Step-down conversion in 12V/48V dual-battery systems for ADAS camera modules and radar units. IC Role / Device Role / Timing Role: Freewheeling diode in synchronous buck regulator, conducting during low-side FET off-time. Use Value: 150ns trr minimizes voltage overshoot across MOSFETs; AEC-Q101 qualification ensures 15-year field reliability under thermal cycling. | Use Scenario: Energy dissipation in IGBT-based motor drives for HVAC compressors and power steering. IC Role / Device Role / Timing Role: Snubber diode clamping inductive kickback during IGBT turn-off. Use Value: 400V VRRM withstands transient spikes up to 350V; glass passivation prevents leakage degradation in humid under-hood environments. |
| Compact AC-DC Adapters | LED Driver Secondary Rectification |
Use Scenario: Output rectification in 5W–15W flyback adapters for smart home sensors and IoT gateways. IC Role / Device Role / Timing Role: Secondary-side output rectifier delivering regulated 3.3V/5V to microcontroller subsystems. Use Value: 0.96V VF at 0.5A reduces conduction loss vs. Schottky alternatives; Thin SMA footprint saves >30% board area vs. SMA. | Use Scenario: Constant-current LED string rectification in automotive interior lighting modules. IC Role / Device Role / Timing Role: Output rectifier in isolated buck-boost LED drivers powering RGB ambient lighting. Use Value: 175°C TJ max allows operation near heat-generating LED arrays; halogen-free construction meets automotive flame-retardancy standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast recovery rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1R04 | Same 1A/400V rating; trr = 120ns (faster), VF = 0.95V; TO-277 package (higher thermal mass) | Higher surge rating (IFSM = 40A) suits intermittent overload; larger footprint limits ultra-thin designs | Prefer when lower trr and higher IFSM justify added board area and cost premium |
| ON Semi MUR1040 | 1A/400V; trr = 50ns (much faster); VF = 1.15V (higher); SMA package (same footprint) | Superior high-frequency efficiency but higher conduction loss; not AEC-Q101 qualified | Prefer in non-automotive, high-switching-frequency SMPS where trr dominates loss budget |
Compared with STTH1R04 and MUR1040, RS1GALH delivers optimal balance of automotive qualification, thermal performance (RθJA = 81°C/W), and cost-effective Thin SMA packaging-making it ideal for volume automotive and industrial DC/DC where reliability and board space are co-constrained.
Availability
RS1GALH is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial snubber circuits, and compact AC-DC adapters requiring stable component supply and long-term lifecycle support.
Supply support for RS1GALH 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive, industrial, and consumer markets since 1979.
The RS1GALH belongs to TSC's AEC-Q101-qualified RS1xALH fast recovery rectifier family, designed specifically for high-reliability, space-constrained power conversion in automotive body electronics and industrial control systems.
FAQ
What is the maximum junction temperature rating for RS1GALH?
The RS1GALH has a maximum junction temperature (TJ) rating of +175°C, validated across its full operating range from –55°C to +175°C. This rating enables deployment in under-hood automotive environments and high-temperature industrial enclosures. Thermal design must respect RθJA = 81°C/W on a 5mm × 5mm Cu pad to ensure safe operation at 1A continuous current.
Is RS1GALH suitable for automotive applications?
Yes, RS1GALH is AEC-Q101 qualified and explicitly listed for automotive applications in its official documentation. It undergoes stress testing for temperature cycling, high-temperature reverse bias, and mechanical shock per the AEC-Q101 standard. Its glass-passivated junction and halogen-free construction further support use in automotive body control modules and ADAS power supplies.
What does the 'G' in RS1GALH indicate?
The 'G' in RS1GALH denotes the 400V repetitive peak reverse voltage (VRRM) rating, per Taiwan Semiconductor's ordering code convention where D=200V, G=400V, J=600V, K=800V, and M=1000V. This coding is confirmed in the Absolute Maximum Ratings table and marking diagram in the official datasheet version C2304.
What is the reverse recovery time (trr) of RS1GALH and under what conditions is it measured?
The RS1GALH reverse recovery time is 150ns, measured under the condition IF = 0.5A, IR = 1.0A, and Irr = 0.25A at TJ = 25°C. This value is specified in the Electrical Specifications table and applies to the RS1DALH and RS1GALH variants only-higher-voltage variants (J/K/M) have longer trr values.
Does RS1GALH have a moisture sensitivity level (MSL) rating?
Yes, RS1GALH has a moisture sensitivity level (MSL) rating of Level 1 per J-STD-020, meaning it has unlimited floor life and can be subjected to standard reflow profiles without pre-baking. This is confirmed in the Features section and Mechanical Data table of the official datasheet.
RS1GALH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-221AC, SMA Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 400 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 150 ns
- Current - Reverse Leakage @ Vr:
- 1 µA @ 400 V
- Capacitance @ Vr, F:
- 7pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Thin SMA
- Operating Temperature - Junction:
- -55°C ~ 150°C
RS1GALH FAQ
1.How can I place an order for RS1GALH through Aetrix?
Please submit a Request for Quotation (RFQ) for RS1GALH 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 RS1GALH reliable?
The price and inventory of RS1GALH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RS1GALH is usually 5 days.
3.What payment methods are accepted for RS1GALH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RS1GALH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RS1GALH?
RS1GALH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RS1GALH 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 RS1GALH?
For technical support, including RS1GALH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RS1GALH requirements.
6.How does Aetrix verify that RS1GALH is sourced from the original manufacturer or authorized distributors?
All RS1GALH 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 RS1GALH meets industry standards.
7.What is the process for return or replacement of RS1GALH?
All RS1GALH units undergo pre-shipment inspection (PSI). If there is an issue with RS1GALH, 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 RS1GALH part is unused and in its original packaging.
Return procedure for RS1GALH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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