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

Taiwan Semiconductor Corporation HS1GAL

Name: HS1GAL
Brand: Taiwan Semiconductor Corporation
SKU: HS1GAL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HS1GAL

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-221AC, SMA Flat Leads

Datasheet:: HS1GAL.pdf

Description:: DIODE GEN PURP 400V 1A THIN SMA

Quantity:: RFQ Add To RFQ list

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Inventory:6,835

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Product details

Overview

HS1GAL from Taiwan Semiconductor is a 1 A, 400 V repetitive peak reverse voltage (V_RRM) high-efficiency surface-mount silicon rectifier diode in a Thin SMA package, featuring 50 ns reverse recovery time (t_rr), 17 pF junction capacitance (C_J), and low forward voltage drop of 0.91 V at 1 A and 25°C - optimized for DC-DC converters and switching-mode power supplies.

For engineers reviewing the HS1GAL datasheet, HS1GAL pinout, HS1GAL application, or HS1GAL equivalent, key selection considerations include its 400 V V_RRM, 35 A I_FSM surge rating, thermal resistance (R_θJL = 29 °C/W), moisture sensitivity level 1 compliance, and cathode-band polarity marking for reliable automated placement and board-level reliability.

Technical Context

This device is a single-die, glass-passivated, fast-recovery rectifier designed for high-frequency switching applications where low conduction loss and rapid turn-off are critical. Its 50 ns t_rr and 17 pF C_J support efficient operation in SMPS topologies up to several hundred kHz.

The Thin SMA package enables low-profile mounting with JESD201 Class 2 whisker resistance, matte tin-plated leads, and UL 94V-0 molding compound - meeting industrial and consumer-grade reflow and long-term reliability requirements without derating below 150°C maximum junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - supports input rectification in 28 V–36 V nominal bus systems with 2× safety margin against transients
I_F	1 A continuous - rated for sustained conduction in compact DC-DC output stages and freewheeling paths
t_rr	50 ns - enables high-frequency switching (>200 kHz) with minimal reverse recovery loss
C_J	17 pF at 1 MHz, 4 V - reduces capacitive coupling noise and EMI in high-dv/dt environments
V_F @ 1 A, 25°C	0.91 V typical - lowers conduction loss to ~0.91 W at full load, easing thermal design
R_θJL	29 °C/W - allows direct PCB copper pad heat sinking for stable operation without heatsinks
I_FSM (8.3 ms)	35 A - withstands inrush and fault currents in unregulated or lightly loaded converter outputs

Pinout & Package

Thin SMA package: surface-mount, single-anode/single-cathode configuration with cathode indicated by a band on the body. Dimensions conform to JEDEC DO-214AC standard (L × W × H ≈ 4.3 × 2.6 × 2.1 mm).

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry point during forward conduction	Connected to lower-potential side (e.g., switch node or ground return) in freewheeling or output rectification
Cathode	Current exit point during forward conduction; marked by band	Connected to higher-potential rail (e.g., output capacitor positive or input bus) - polarity must be verified before placement

Key Features

Feature	Design Value
Glass passivated junction	Prevents moisture ingress and surface leakage, ensuring stable IR < 1 µA at 400 V and 25°C
Fast recovery (50 ns)	Minimizes switching loss and ringing in synchronous and quasi-resonant topologies
Moisture sensitivity level 1	Eliminates bake requirement prior to reflow - compatible with standard SMT assembly lines
Halogen-free & RoHS compliant	Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing
Low profile (2.1 mm height)	Enables ultra-thin power modules and space-constrained portable electronics designs

Applications

DC-DC Converter Output Rectification	Switching Mode Inverter Freewheeling
Use Scenario: Used as secondary-side rectifier in isolated flyback or forward converters delivering 5–24 V at ≤1 A. IC Role / Device Role / Timing Role: Unidirectional current valve converting high-frequency AC from transformer secondary into regulated DC output. Use Value: 0.91 V V_F at 1 A reduces conduction loss by ~15% vs. legacy 1N5819, improving efficiency in 5 V/1 A adapters.	Use Scenario: Placed across inductive loads (e.g., motor windings or solenoids) in half-bridge inverters. IC Role / Device Role / Timing Role: Provides low-loss path for inductive kickback current during MOSFET off-time. Use Value: 50 ns t_rr prevents cross-conduction and voltage overshoot during rapid current reversal.
AC-DC Adapter Input Bridge Leg	Industrial Sensor Power Supply Rectification
Use Scenario: One leg of a discrete bridge rectifier in universal-input (90–264 VAC) 5–12 W adapters. IC Role / Device Role / Timing Role: Conducts during positive half-cycle of rectified AC, blocking reverse voltage up to 400 V. Use Value: 400 V V_RRM provides 1.4× margin over 280 V peak line voltage, supporting global mains input.	Use Scenario: Rectifying low-power auxiliary rails (e.g., ±12 V or +5 V) in PLC I/O modules or field transmitters. IC Role / Device Role / Timing Role: Converts transformer-derived AC into stable bias supply for op-amps and signal conditioners. Use Value: R_θJL = 29 °C/W enables operation at full load without forced air, even in sealed enclosures.

DC-DC Converter Output Rectification

Switching Mode Inverter Freewheeling

Use Scenario: Used as secondary-side rectifier in isolated flyback or forward converters delivering 5–24 V at ≤1 A.

IC Role / Device Role / Timing Role: Unidirectional current valve converting high-frequency AC from transformer secondary into regulated DC output.

Use Value: 0.91 V V_F at 1 A reduces conduction loss by ~15% vs. legacy 1N5819, improving efficiency in 5 V/1 A adapters.

Use Scenario: Placed across inductive loads (e.g., motor windings or solenoids) in half-bridge inverters.

IC Role / Device Role / Timing Role: Provides low-loss path for inductive kickback current during MOSFET off-time.

Use Value: 50 ns t_rr prevents cross-conduction and voltage overshoot during rapid current reversal.

AC-DC Adapter Input Bridge Leg

Industrial Sensor Power Supply Rectification

Use Scenario: One leg of a discrete bridge rectifier in universal-input (90–264 VAC) 5–12 W adapters.

IC Role / Device Role / Timing Role: Conducts during positive half-cycle of rectified AC, blocking reverse voltage up to 400 V.

Use Value: 400 V V_RRM provides 1.4× margin over 280 V peak line voltage, supporting global mains input.

Use Scenario: Rectifying low-power auxiliary rails (e.g., ±12 V or +5 V) in PLC I/O modules or field transmitters.

IC Role / Device Role / Timing Role: Converts transformer-derived AC into stable bias supply for op-amps and signal conditioners.

Use Value: R_θJL = 29 °C/W enables operation at full load without forced air, even in sealed enclosures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-efficiency rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1L04	Same 1 A / 400 V rating; 55 ns t_rr, 22 pF C_J, higher V_F (1.05 V @ 1 A)	Slightly higher conduction loss; requires larger thermal pad for same ambient temp	Preferred when ST ecosystem compatibility or automotive qualification (AEC-Q101) is required
SB140	1 A / 40 V rating; Schottky architecture; 0.5 V V_F; no reverse recovery (t_rr ≈ 0 ns)	Not suitable for 400 V line-referenced applications - limited to low-voltage DC-DC only	Select only for sub-48 V systems where ultra-low V_F outweighs voltage limitation

Compared with STTH1L04 and SB140, HS1GAL delivers optimal balance of 400 V blocking capability, 50 ns speed, and 0.91 V forward drop - making it uniquely suited for universal-input AC-DC and mid-voltage DC-DC where both voltage margin and switching efficiency matter.

Availability

HS1GAL is available at Aetrix Electronics and suitable for DC-DC converter output rectification, switching mode inverter freewheeling, and industrial sensor power supply rectification requiring stable component supply, consistent parametric performance, and full traceability.

Supply support for HS1GAL 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 industrial, computing, and consumer markets since 1979.

The HS1xAL series was developed specifically for high-efficiency, surface-mount rectification in space-constrained power conversion systems - emphasizing fast recovery, low profile, and robust thermal performance without requiring external heatsinking.

FAQ

What is the maximum junction temperature rating for HS1GAL?

The HS1GAL has a maximum junction temperature (T_J) rating of +150°C, validated per absolute maximum ratings in the official TSC datasheet Version D2103. This allows continuous operation in high-ambient environments such as enclosed power supplies or industrial control cabinets, provided thermal design maintains junction temperature within this limit using the specified R_θJL = 29 °C/W path to PCB copper.

Does HS1GAL have a cathode band marking for polarity identification?

Yes, HS1GAL uses a visible cathode band on the body of the Thin SMA package to indicate the cathode terminal - consistent with JEDEC DO-214AC conventions. This marking is essential for correct orientation during automated placement and manual inspection, as reverse biasing beyond 400 V will cause immediate failure. The band aligns with the cathode terminal in the pinout diagram provided in the TSC datasheet.

What is the reverse recovery time (t_rr) specification for HS1GAL and under what test conditions?

The HS1GAL reverse recovery time is specified as 50 ns maximum, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A, per the TSC datasheet Version D2103. This value reflects actual switching behavior in high-frequency DC-DC converters and ensures minimal energy loss during turn-off transitions, directly contributing to improved system efficiency above 100 kHz.

Is HS1GAL compliant with RoHS and halogen-free standards?

Yes, HS1GAL is RoHS compliant per EU Directive 2011/65/EU and halogen-free per IEC 61249-2-21. These compliance statements are explicitly confirmed in the "Features" section of the TSC datasheet Version D2103 and verified through material declarations. No lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE substances exceed allowable thresholds, and bromine/chlorine content is below 900 ppm.

What is the junction-to-lead thermal resistance (R_θJL) of HS1GAL and how is it measured?

The junction-to-lead thermal resistance (R_θJL) of HS1GAL is 29 °C/W, measured with the device mounted on a 5 mm × 5 mm copper pad per JESD51-14 guidelines. This parameter defines the thermal path from die to solder joint - enabling accurate junction temperature estimation in real-world layouts. It is distinct from R_θJA (51 °C/W), which assumes still-air ambient and includes PCB convection effects.

HS1GAL 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:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: Thin SMA

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

HS1GAL FAQ

1.How can I place an order for HS1GAL through Aetrix?

Please submit a Request for Quotation (RFQ) for HS1GAL 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 HS1GAL reliable?

The price and inventory of HS1GAL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HS1GAL is usually 5 days.

3.What payment methods are accepted for HS1GAL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HS1GAL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HS1GAL?

HS1GAL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HS1GAL 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 HS1GAL?

For technical support, including HS1GAL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HS1GAL requirements.

6.How does Aetrix verify that HS1GAL is sourced from the original manufacturer or authorized distributors?

All HS1GAL 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 HS1GAL meets industry standards.

7.What is the process for return or replacement of HS1GAL?

All HS1GAL units undergo pre-shipment inspection (PSI). If there is an issue with HS1GAL, 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 HS1GAL part is unused and in its original packaging.

Return procedure for HS1GAL:

1.Submit a request within 90 days.

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

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