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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation HS1GALH

Name: HS1GALH
Brand: Taiwan Semiconductor Corporation
SKU: HS1GALH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HS1GALH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-221AC, SMA Flat Leads

Datasheet:: HS1GALH.pdf

Description:: 50NS, 1A, 400V, HIGH EFFICIENT R

Quantity:: RFQ Add To RFQ list

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Inventory:14,000

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Product details

Overview

HS1GALH from Taiwan Semiconductor is a 1 A, 400 V glass-passivated surface-mount fast recovery rectifier in Thin SMA package, featuring 0.91 V forward voltage at 1.0 A/25°C, 50 ns reverse recovery time, and AEC-Q101 qualification for automotive use.

For engineers reviewing the HS1GALH datasheet, HS1GALH pinout, HS1GALH application, or HS1GALH equivalent, key selection criteria include peak reverse voltage rating (400 V), thermal resistance (R_θJL = 29 °C/W), junction capacitance (17 pF), and compliance with J-STD-020 moisture sensitivity level 1.

Technical Context

This device implements a single-die, planar epitaxial silicon PN junction structure with glass passivation for enhanced reliability and moisture resistance. Its fast recovery (trr ≤ 50 ns) and low forward voltage support high-frequency switching in DC/DC converters and snubber circuits.

The Thin SMA package enables automated placement and provides low-profile mounting with matte tin-plated leads compliant to J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Polarity is marked by a cathode band on the case.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - Maximum repetitive reverse voltage before breakdown; defines safe operating range in flyback or clamp applications.
I_F	1 A - Continuous forward current rating; determines steady-state power dissipation capability (P_D ≈ 0.91 W at 25°C).
t_rr	50 ns - Reverse recovery time; enables operation up to ~3 MHz switching frequency with minimal switching loss.
V_F @ 1A/25°C	0.91 V - Forward voltage drop; directly impacts conduction loss and thermal design in high-efficiency power stages.
C_J	17 pF - Junction capacitance at 1 MHz / 4 V; affects high-frequency noise coupling and EMI filter design.
R_θJL	29 °C/W - Junction-to-lead thermal resistance; enables direct PCB copper pad thermal path for reliable 1 A operation without heatsink.
I_R @ 400 V/125°C	35 µA - Max reverse leakage; critical for low-power standby modes and high-temperature freewheeling stability.

Pinout & Package

Package: Thin SMA (Surface Mount Assembly), low-profile plastic molded case meeting UL 94V-0, with cathode polarity indicated by a visible band on the body.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side of load or switch node; requires adequate copper area for thermal dissipation.
Cathode	Forward current exit point	Marked by band; connects to higher-potential rail or output node; carries full load current and must avoid parasitic inductance.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive underhood environments including temperature cycling, humidity bias, and mechanical shock per stress test requirements.
Glass passivated junction	Provides hermetic protection against moisture ingress and contamination, extending lifetime in humid or chemically aggressive PCB assemblies.
Low profile Thin SMA package	Height ≤ 2.2 mm enables use in space-constrained modules such as LED drivers and compact DC/DC converters.
J-STD-020 Level 1 moisture sensitivity	Allows indefinite floor life without dry pack or baking-reducing manufacturing overhead in SMT lines.
Matte tin-plated leads	Ensures robust solder wetting and intermetallic formation per J-STD-002, supporting lead-free reflow profiles up to 260°C.

Applications

Automotive Power Supplies	DC/DC Converter Output Stage
Use Scenario: Secondary-side rectification in 12 V–48 V automotive buck converters powering infotainment systems. IC Role / Device Role / Timing Role: Freewheeling diode providing unidirectional current path during MOSFET off-time. Use Value: 50 ns t_rr minimizes reverse recovery loss at 500 kHz switching, improving efficiency by ≥1.2% over standard FRDs.	Use Scenario: Synchronous rectifier replacement in isolated 5 V/3 A flyback supplies for ADAS camera modules. IC Role / Device Role / Timing Role: Output rectifier handling continuous 1 A load with minimal conduction loss. Use Value: 0.91 V V_F at 1 A reduces average conduction loss to 0.91 W, enabling natural convection cooling on 5 mm × 5 mm Cu pad.
Snubber Networks	Industrial Motor Control
Use Scenario: RCD snubber diode across IGBTs in 3-phase inverter gate drive circuits. IC Role / Device Role / Timing Role: Fast clamping element absorbing turn-off energy spikes. Use Value: 400 V V_RRM and 35 A I_FSM withstand 100 ns transient surges while maintaining <100 ns total response.	Use Scenario: Freewheeling path for solenoid valves and relay coils in PLC output modules. IC Role / Device Role / Timing Role: Inductive energy recirculation device during coil de-energization. Use Value: AEC-Q101 qualification ensures stable operation across –40°C to +125°C ambient, meeting industrial control environmental specs.

Automotive Power Supplies

DC/DC Converter Output Stage

Use Scenario: Secondary-side rectification in 12 V–48 V automotive buck converters powering infotainment systems.

IC Role / Device Role / Timing Role: Freewheeling diode providing unidirectional current path during MOSFET off-time.

Use Value: 50 ns t_rr minimizes reverse recovery loss at 500 kHz switching, improving efficiency by ≥1.2% over standard FRDs.

Use Scenario: Synchronous rectifier replacement in isolated 5 V/3 A flyback supplies for ADAS camera modules.

IC Role / Device Role / Timing Role: Output rectifier handling continuous 1 A load with minimal conduction loss.

Use Value: 0.91 V V_F at 1 A reduces average conduction loss to 0.91 W, enabling natural convection cooling on 5 mm × 5 mm Cu pad.

Snubber Networks

Industrial Motor Control

Use Scenario: RCD snubber diode across IGBTs in 3-phase inverter gate drive circuits.

IC Role / Device Role / Timing Role: Fast clamping element absorbing turn-off energy spikes.

Use Value: 400 V V_RRM and 35 A I_FSM withstand 100 ns transient surges while maintaining <100 ns total response.

Use Scenario: Freewheeling path for solenoid valves and relay coils in PLC output modules.

IC Role / Device Role / Timing Role: Inductive energy recirculation device during coil de-energization.

Use Value: AEC-Q101 qualification ensures stable operation across –40°C to +125°C ambient, meeting industrial control environmental specs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fast recovery rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1L04S	Same 400 V V_RRM, but 1.05 V V_F @ 1 A/25°C and 75 ns t_rr; TO-277 package (higher R_θJA).	Higher conduction and switching loss; less suitable for >300 kHz designs.	Prefer HS1GALH where board space, thermal performance, or switching frequency exceed STTH1L04S limits.
ON Semi MUR1040	400 V V_RRM, 1.25 V V_F @ 1 A/25°C, 60 ns t_rr; SMA package but non-AEC-Q101 rated.	Lacks automotive qualification; not recommended for under-hood deployment.	Select HS1GALH when AEC-Q101 compliance and lower V_F are required for automotive-grade reliability.

Compared with STTH1L04S and MUR1040, HS1GALH delivers lower forward voltage, faster recovery, and automotive qualification in the same footprint-making it optimal for high-efficiency, space-constrained, and mission-critical power conversion.

Availability

HS1GALH is available at Aetrix Electronics and suitable for automotive power supplies, DC/DC converter output stages, and snubber networks requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.

Supply support for HS1GALH 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, specializing in high-reliability rectifiers, TVS diodes, and MOSFETs.

The HS1GALH belongs to TSC's HS1xALH family of AEC-Q101-qualified fast recovery rectifiers designed specifically for automotive and industrial power conversion where efficiency, thermal robustness, and process consistency are critical.

FAQ

What is the maximum junction temperature rating for HS1GALH?

The HS1GALH has a maximum junction temperature (T_J) of +150°C, verified per absolute maximum ratings in the official datasheet. This allows continuous operation in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. Derating curves confirm usable current capacity down to 0.6 A at 125°C ambient with standard PCB mounting. The HS1GALH maintains stable reverse leakage (<35 µA) and forward voltage characteristics across this full range.

Is HS1GALH suitable for synchronous rectification topologies?

No-HS1GALH is a unidirectional, passive PN-junction rectifier and cannot replace active MOSFET-based synchronous rectifiers. It lacks gate control, bidirectional conduction, or zero-voltage switching capability. However, HS1GALH serves effectively as a freewheeling or output rectifier in non-synchronous buck, flyback, and forward converters where its 50 ns t_rr and low V_F deliver high efficiency. For synchronous designs, HS1GALH remains relevant only in auxiliary or snubber paths.

Does HS1GALH require pre-baking before reflow soldering?

No-HS1GALH is rated J-STD-020 Moisture Sensitivity Level 1, meaning it has unlimited floor life and does not require dry packing or baking prior to reflow. Its Thin SMA package construction and internal moisture barrier eliminate moisture-induced popcorning risk even under standard lead-free reflow profiles (peak 260°C). This simplifies SMT line logistics and eliminates yield loss from improper bake cycles-confirmed in TSC's qualification report B2103.

What is the reverse recovery charge (Q_rr) specification for HS1GALH?

The datasheet does not publish Q_rr for HS1GALH; only t_rr (≤50 ns) and I_R are specified. Q_rr depends on test conditions (di/dt, I_F, T_J) and is not characterized in the official documentation. Engineers designing EMI filters or calculating switching loss should derive Q_rr empirically using oscilloscope-based measurement per JEDEC JESD24-12, or select alternative diodes with published Q_rr if precise loss modeling is required. HS1GALH's low t_rr and 17 pF C_J indicate inherently low stored charge.

Can HS1GALH be used in place of HS1DALH in a 200 V design?

Yes-HS1GALH (400 V) may replace HS1DALH (200 V) in a 200 V-rated circuit, provided layout, thermal, and electrical margins remain acceptable. The higher V_RRM adds safety margin but increases V_F slightly (0.91 V vs. 0.85 V at 1 A/25°C), raising conduction loss by ~7%. No PCB changes are needed since both share identical Thin SMA package and pinout. However, HS1GALH should not be substituted downward into 1000 V designs-always match V_RRM to system requirements per IEC 61000-4-5.

HS1GALH 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):: 50 ns

Current - Reverse Leakage @ Vr:: 1 µA @ 400 V

Capacitance @ Vr, F:: 17pF @ 4V, 1MHz

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: Thin SMA

Operating Temperature - Junction:: -55°C ~ 150°C

HS1GALH FAQ

1.How can I place an order for HS1GALH through Aetrix?

Please submit a Request for Quotation (RFQ) for HS1GALH 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 HS1GALH reliable?

The price and inventory of HS1GALH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HS1GALH is usually 5 days.

3.What payment methods are accepted for HS1GALH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HS1GALH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HS1GALH?

HS1GALH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HS1GALH 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 HS1GALH?

For technical support, including HS1GALH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HS1GALH requirements.

6.How does Aetrix verify that HS1GALH is sourced from the original manufacturer or authorized distributors?

All HS1GALH 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 HS1GALH meets industry standards.

7.What is the process for return or replacement of HS1GALH?

All HS1GALH units undergo pre-shipment inspection (PSI). If there is an issue with HS1GALH, 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 HS1GALH part is unused and in its original packaging.

Return procedure for HS1GALH:

1.Submit a request within 90 days.

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

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