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

Taiwan Semiconductor Corporation US1MHR3G

Name: US1MHR3G
Brand: Taiwan Semiconductor Corporation
SKU: US1MHR3G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: US1MHR3G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-214AC, SMA

Datasheet:: US1MHR3G.pdf

Description:: DIODE GEN PURP 1A DO214AC

Quantity:: RFQ Add To RFQ list

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Inventory:9,108

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Product details

Overview

US1MHR3G from Taiwan Semiconductor is a 1 A, 1000 V ultrafast surface-mount rectifier in DO-214AC (SMA) package, featuring 1.7 V max forward voltage at 1 A and 75 ns reverse recovery time. It serves as a freewheeling or snubber diode in high-frequency switching power supplies, delivering low conduction loss and fast turn-off in DC-DC converters and lighting inverters.

For engineers reviewing the US1MHR3G datasheet, US1MHR3G pinout, US1MHR3G application, or US1MHR3G equivalent, key selection criteria include peak reverse voltage rating, thermal resistance (R_θJA = 75 °C/W), junction capacitance (10 pF), and moisture sensitivity level (MSL 1).

Technical Context

This device is a single-die, unidirectional silicon rectifier optimized for high-efficiency switching applications. Its ultrafast recovery (t_rr ≤ 75 ns) minimizes switching losses during turn-off, while glass passivation ensures stable junction performance under thermal cycling and humidity stress.

The DO-214AC (SMA) package supports automated placement and provides 27 °C/W junction-to-lead thermal resistance. Polarity is marked by a cathode band, and terminals are matte tin-plated per J-STD-002 solderability standards.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	1000 V - maximum repetitive reverse blocking voltage without breakdown
I_F	1 A continuous - average forward current rating at T_L = 75 °C
t_rr	75 ns - reverse recovery time limits switching loss in >100 kHz topologies
V_F	1.7 V max at I_F = 1 A, T_J = 25 °C - determines conduction loss in high-duty-cycle operation
R_θJA	75 °C/W - defines temperature rise above ambient under natural convection
C_J	10 pF at 1 MHz, V_R = 4 V - impacts high-frequency noise coupling and EMI filter design
I_FSM	30 A peak - surge capability for inrush or fault conditions in SMPS input stages

Pinout & Package

Package: DO-214AC (SMA), surface-mount, single-anode/single-cathode configuration with cathode band marking.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side of load or switch node in flyback/freewheeling paths
Cathode	Forward current exit point	Marked by band; connects to higher-potential rail or output capacitor positive terminal

Key Features

Feature	Design Value
Glass passivated junction	Enables stable leakage current (<5 µA @ 25°C) and long-term reliability in humid environments
Ultrafast recovery (75 ns)	Reduces reverse recovery charge (Q_rr) and associated switching losses in high-frequency converters
MSL 1 rating	Eliminates bake-out requirement before reflow, supporting standard SMT assembly processes
Halogen-free compound	Complies with IEC 61249-2-21, enabling use in environmentally regulated industrial and lighting products
Matte tin-plated leads	Ensures consistent wetting and joint integrity per J-STD-002, critical for high-yield automated assembly

Applications

DC-DC Converters	LED Lighting Inverters
Use Scenario: Secondary-side rectification in isolated buck-boost or flyback LED drivers operating at 50–200 kHz. IC Role / Device Role / Timing Role: Freewheeling diode providing low-loss current path during MOSFET off-time. Use Value: 1.7 V V_F and 75 ns t_rr reduce conduction and switching losses, improving driver efficiency by ≥1.2% at 1 A output.	Use Scenario: Snubber network in high-voltage AC-DC LED ballasts with TRIAC dimming compatibility. IC Role / Device Role / Timing Role: Voltage-clamping diode absorbing inductive kickback from transformer leakage inductance. Use Value: 1000 V V_RRM withstands transient spikes up to 1.2× line voltage, preventing snubber failure during dimmer phase-cut transitions.
Switching Mode Power Supplies	Industrial Motor Drives
Use Scenario: Output rectification in 24 V/48 V telecom PSUs with synchronous rectification disabled. IC Role / Device Role / Timing Role: Unidirectional current valve converting high-frequency AC from transformer secondary to DC output. Use Value: R_θJA = 75 °C/W enables 1 A operation at 70 °C ambient without heatsink, simplifying board layout.	Use Scenario: Freewheeling path for gate-drive transformers in half-bridge IGBT gate drivers. IC Role / Device Role / Timing Role: Fast-recovery clamp protecting driver ICs from back-EMF during IGBT turn-off. Use Value: 10 pF junction capacitance minimizes capacitive loading on gate drive waveforms, preserving edge speed and timing margin.

DC-DC Converters

LED Lighting Inverters

Use Scenario: Secondary-side rectification in isolated buck-boost or flyback LED drivers operating at 50–200 kHz.

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

Use Value: 1.7 V V_F and 75 ns t_rr reduce conduction and switching losses, improving driver efficiency by ≥1.2% at 1 A output.

Use Scenario: Snubber network in high-voltage AC-DC LED ballasts with TRIAC dimming compatibility.

IC Role / Device Role / Timing Role: Voltage-clamping diode absorbing inductive kickback from transformer leakage inductance.

Use Value: 1000 V V_RRM withstands transient spikes up to 1.2× line voltage, preventing snubber failure during dimmer phase-cut transitions.

Switching Mode Power Supplies

Industrial Motor Drives

Use Scenario: Output rectification in 24 V/48 V telecom PSUs with synchronous rectification disabled.

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

Use Value: R_θJA = 75 °C/W enables 1 A operation at 70 °C ambient without heatsink, simplifying board layout.

Use Scenario: Freewheeling path for gate-drive transformers in half-bridge IGBT gate drivers.

IC Role / Device Role / Timing Role: Fast-recovery clamp protecting driver ICs from back-EMF during IGBT turn-off.

Use Value: 10 pF junction capacitance minimizes capacitive loading on gate drive waveforms, preserving edge speed and timing margin.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R06U	Same V_RRM (600 V), lower V_F (1.3 V typ), but t_rr = 35 ns - faster but lower voltage rating	Not suitable for 1000 V bus designs; limited to ≤600 V DC-link applications	Select only if system V_RRM margin allows 600 V rating and faster recovery is prioritized over voltage headroom
ES1J-E3/54	Same DO-214AC package, identical V_RRM (600 V), V_F = 1.7 V, t_rr = 35 ns - faster but lower voltage rating	Requires redesign of snubber/clamp networks when replacing US1MHR3G in 1000 V systems	Use where 600 V rating suffices and tighter t_rr tolerance is needed; verify layout clearance for reduced V_RRM

Compared with STTH1R06U and ES1J-E3/54, US1MHR3G uniquely supports 1000 V blocking while maintaining MSL 1 and halogen-free compliance - critical for high-voltage industrial lighting and telecom power where safety margins and RoHS enforcement are non-negotiable.

Availability

US1MHR3G is available at Aetrix Electronics and suitable for DC-DC converters, LED lighting inverters, and industrial motor drives requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for US1MHR3G 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 power rectifiers, TVS devices, and MOSFETs since 1979.

The US1x series was designed specifically for high-efficiency, high-frequency switching power conversion - targeting cost-sensitive yet reliability-critical applications in lighting, telecom, and industrial power supplies.

FAQ

What is the maximum junction temperature rating for US1MHR3G?

The US1MHR3G has a maximum junction temperature (T_J) of +150 °C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet. This rating enables reliable operation in enclosed industrial enclosures or high-ambient lighting fixtures where heatsinking is constrained. Derating curves confirm usable current capacity down to 0.5 A at 125 °C ambient, provided PCB copper area meets minimum thermal pad requirements.

Is US1MHR3G compatible with lead-free reflow soldering profiles?

Yes, US1MHR3G is fully compatible with lead-free reflow soldering per J-STD-020. Its MSL 1 classification means it can be stored indefinitely at ≤30 °C/60% RH without baking, and its matte tin-plated leads meet J-STD-002 for wetting performance. Peak reflow temperature up to 260 °C is supported, matching standard Pb-free SAC305 profiles used in automotive and industrial assembly lines.

Does US1MHR3G have a specified junction-to-case thermal resistance?

No, the US1MHR3G datasheet does not specify R_θJC; only R_θJL = 27 °C/W (junction-to-lead) and R_θJA = 75 °C/W (junction-to-ambient) are provided. Thermal design must rely on R_θJL for solder-pad-based conduction paths or R_θJA for natural-convection board-level estimation. No R_θJC value is published or validated for this DO-214AC device.

What is the reverse leakage current specification for US1MHR3G at elevated temperature?

At T_J = 125 °C and rated V_R, US1MHR3G exhibits a maximum reverse leakage current (I_R) of 150 µA, per the electrical specifications table. This value is measured under pulse conditions (PW = 30 ms) and reflects worst-case leakage in high-temperature LED driver or telecom PSU environments where thermal runaway must be avoided in parallel-connected configurations.

Can US1MHR3G be used as a direct replacement for US1M in existing designs?

Yes, US1MHR3G is a direct replacement for US1M - both share identical electrical parameters (V_RRM = 1000 V, I_F = 1 A, t_rr ≤ 75 ns), DO-214AC package, and MSL 1 rating. The "HR3G" suffix denotes green/halogen-free compliance and tape-and-reel packaging per J-STD-020; no circuit or layout changes are required when upgrading from legacy US1M to US1MHR3G.

US1MHR3G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-214AC, SMA

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 1000 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 1.7 V @ 1 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 75 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 1000 V

Capacitance @ Vr, F:: 10pF @ 4V, 1MHz

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AC (SMA)

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

US1MHR3G FAQ

1.How can I place an order for US1MHR3G through Aetrix?

Please submit a Request for Quotation (RFQ) for US1MHR3G 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 US1MHR3G reliable?

The price and inventory of US1MHR3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for US1MHR3G is usually 5 days.

3.What payment methods are accepted for US1MHR3G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for US1MHR3G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for US1MHR3G?

US1MHR3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your US1MHR3G 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 US1MHR3G?

For technical support, including US1MHR3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your US1MHR3G requirements.

6.How does Aetrix verify that US1MHR3G is sourced from the original manufacturer or authorized distributors?

All US1MHR3G 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 US1MHR3G meets industry standards.

7.What is the process for return or replacement of US1MHR3G?

All US1MHR3G units undergo pre-shipment inspection (PSI). If there is an issue with US1MHR3G, 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 US1MHR3G part is unused and in its original packaging.

Return procedure for US1MHR3G:

1.Submit a request within 90 days.

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

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