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

Taiwan Semiconductor Corporation HER303G

Name: HER303G
Brand: Taiwan Semiconductor Corporation
SKU: HER303G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HER303G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: HER303G.pdf

Description:: DIODE GEN PURP 200V 3A DO201AD

Quantity:: RFQ Add To RFQ list

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Product details

Overview

HER303G from Taiwan Semiconductor is a high-efficiency, single-die ultrafast recovery rectifier in DO-201AD package, rated for 3 A average forward current, 200 V repetitive peak reverse voltage (V_RRM), and 50 ns reverse recovery time (t_rr). It delivers low forward voltage drop (1.0 V at 3 A, 25°C) and supports DC-DC converters, switching inverters, and freewheeling paths in industrial power supplies.

For engineers reviewing the HER303G datasheet, HER303G pinout, HER303G application, or HER303G equivalent, key selection factors include its 200 V V_RRM, 125 A surge rating, 10 °C/W junction-to-lead thermal resistance, AEC-Q101 qualification option (HER303GH), and DO-201AD mechanical compatibility with standard through-hole reflow and wave soldering processes.

Technical Context

The HER303G employs an epitaxial planar construction optimized for fast soft recovery, minimizing switching losses in high-frequency SMPS topologies. Its 50 ns t_rr and 60 pF junction capacitance (at 4 V, 1 MHz) enable stable operation up to ~100 kHz without significant ringing or EMI penalties.

Thermally, the device features a 10 °C/W R_θJL and operates from –55°C to +150°C junction temperature, supporting derated conduction in compact heatsinkless designs where lead-frame conduction dominates over ambient dissipation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	200 V - Maximum non-repetitive reverse blocking voltage; defines usable input range in 100–170 VAC rectification or 200 V bus clamp applications.
I_F	3 A - Continuous average forward current at T_C = 75°C; supports 36 W output in 12 V/3 A isolated flyback designs with margin.
t_rr	50 ns - Measured at I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A; enables efficient operation in 50–100 kHz hard-switched converters.
V_F	1.0 V - Forward voltage at I_F = 3 A, T_J = 25°C; contributes ≤3 W conduction loss per device at full load.
R_θJL	10 °C/W - Junction-to-lead thermal resistance; allows direct PCB copper pour thermal coupling to chassis ground or heatsink tab.
I_FSM	125 A - Non-repetitive surge current (8.3 ms half-sine); withstands inrush into bulk capacitors or motor startup transients.

Pinout & Package

HER303G is housed in a DO-201AD axial-leaded package with cathode-indicating band. Leads are pure tin-plated, J-STD-002 solderable, and meet JESD201 Class 2 whisker resistance.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Forward current entry node	Connected to AC input or switch-node side in freewheeling configuration; requires minimum 1.5 mm creepage clearance at 200 V.
Cathode (banded end)	Forward current exit / reverse blocking terminal	Connected to output rail or ground return; polarity marking ensures correct orientation during manual or automated placement.

Key Features

Feature	Design Value
Ultrafast recovery (50 ns)	Reduces switching loss and EMI in 50–100 kHz SMPS, enabling smaller output filters vs. standard FR/UF diodes.
Low V_F (1.0 V @ 3 A)	Lowers conduction loss by ~15% versus comparable 200 V UF300x series, improving efficiency in 12–24 V output stages.
DO-201AD mechanical standardization	Enables drop-in replacement of legacy 3 A rectifiers (e.g., 1N540x, UF540x) without footprint redesign.
AEC-Q101 qualified variant (HER303GH)	Validated for automotive under-hood environments including temperature cycling, humidity bias, and mechanical shock per AEC stress test plan.

Applications

DC-DC Converter Output Rectification	Switching Inverter Freewheeling
Use Scenario: Secondary-side synchronous or diode rectification in isolated 12 V/3 A flyback or forward converter powering industrial PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional current valve conducting during transformer reset phase; reverse recovery timing directly impacts snubber sizing and MOSFET turn-on loss. Use Value: 50 ns t_rr and 1.0 V V_F reduce total loss to <2.5 W, enabling natural convection cooling in sealed enclosures.	Use Scenario: Freewheeling path across inductive loads (e.g., solenoid drivers, relay coils) in 24 V DC control systems with PWM switching at 20 kHz. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during MOSFET off-time; fast recovery prevents voltage overshoot exceeding 200 V rail rating. Use Value: 125 A I_FSM handles 10× rated coil current surges; 200 V V_RRM provides 2× safety margin over 24 V system with inductive kick.
AC-DC Input Bridge Leg	UPS Battery Charging Stage
Use Scenario: Single-leg rectification in split-rail 100–120 VAC input stage feeding PFC pre-regulator in telecom power supply. IC Role / Device Role / Timing Role: Conducts positive half-cycle; reverse recovery behavior affects EMI filter design and conducted emissions above 150 kHz. Use Value: 60 pF C_J minimizes displacement current injection into EMI filter; 10 °C/W R_θJL allows direct mounting to aluminum chassis for thermal management.	Use Scenario: Isolated charging path from 24 V DC bus to 12 V sealed lead-acid battery bank in line-interactive UPS with auto-transfer switching. IC Role / Device Role / Timing Role: Blocks reverse current from battery during main power operation; conducts only during charger active phase. Use Value: 10 µA max I_R at 25°C prevents >1 mA parasitic drain, extending battery float life beyond 6 months without recharge.

DC-DC Converter Output Rectification

Switching Inverter Freewheeling

Use Scenario: Secondary-side synchronous or diode rectification in isolated 12 V/3 A flyback or forward converter powering industrial PLC I/O modules.

IC Role / Device Role / Timing Role: Unidirectional current valve conducting during transformer reset phase; reverse recovery timing directly impacts snubber sizing and MOSFET turn-on loss.

Use Value: 50 ns t_rr and 1.0 V V_F reduce total loss to <2.5 W, enabling natural convection cooling in sealed enclosures.

Use Scenario: Freewheeling path across inductive loads (e.g., solenoid drivers, relay coils) in 24 V DC control systems with PWM switching at 20 kHz.

IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during MOSFET off-time; fast recovery prevents voltage overshoot exceeding 200 V rail rating.

Use Value: 125 A I_FSM handles 10× rated coil current surges; 200 V V_RRM provides 2× safety margin over 24 V system with inductive kick.

AC-DC Input Bridge Leg

UPS Battery Charging Stage

Use Scenario: Single-leg rectification in split-rail 100–120 VAC input stage feeding PFC pre-regulator in telecom power supply.

IC Role / Device Role / Timing Role: Conducts positive half-cycle; reverse recovery behavior affects EMI filter design and conducted emissions above 150 kHz.

Use Value: 60 pF C_J minimizes displacement current injection into EMI filter; 10 °C/W R_θJL allows direct mounting to aluminum chassis for thermal management.

Use Scenario: Isolated charging path from 24 V DC bus to 12 V sealed lead-acid battery bank in line-interactive UPS with auto-transfer switching.

IC Role / Device Role / Timing Role: Blocks reverse current from battery during main power operation; conducts only during charger active phase.

Use Value: 10 µA max I_R at 25°C prevents >1 mA parasitic drain, extending battery float life beyond 6 months without recharge.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3L02	Same 200 V V_RRM, 3 A I_F, but 35 ns t_rr; higher V_F (1.15 V @ 3 A).	Better suited for >150 kHz ZVS/ZCS topologies where recovery speed dominates loss budget.	Prefer STTH3L02 when operating frequency exceeds 120 kHz or when lower EMI is critical.
ON Semi MUR320	200 V V_RRM, 3 A I_F, 60 ns t_rr; identical V_F (1.0 V) and DO-201AD package.	Identical thermal and electrical envelope; validated in legacy industrial designs with long field history.	Choose MUR320 for drop-in qualification reuse in existing UL/CE-certified products requiring no retesting.

Compared with STTH3L02 and MUR320, HER303G offers balanced performance: faster than MUR320 (50 ns vs. 60 ns) with lower V_F than STTH3L02, making it optimal for cost-sensitive 50–100 kHz industrial SMPS where thermal margin and BOM cost are prioritized.

Availability

HER303G is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and freewheeling applications requiring stable component supply, AEC-Q101-qualified variants (HER303GH), and DO-201AD-compatible logistics handling.

Supply support for HER303G 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 diodes, and MOSFETs for industrial and automotive markets.

The HER30xG series was designed specifically for high-efficiency, medium-voltage switching power supplies demanding ultrafast recovery, low conduction loss, and robust surge immunity in space-constrained layouts.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for HER303G?

The HER303G has a V_RRM rating of 200 V, verified per Taiwan Semiconductor's I2105 datasheet Absolute Maximum Ratings table. This value defines the highest continuous reverse voltage the device can block without breakdown under normal operating conditions and is strictly limited to the HER303G variant within the HER301G–HER308G family.

Is HER303G RoHS and halogen-free compliant?

Yes, HER303G meets RoHS Directive 2011/65/EU requirements and is halogen-free per IEC 61249-2-21, as confirmed in the Features section of the official datasheet. The molding compound is UL 94V-0 rated, and terminals use pure tin plating compliant with J-STD-002 solderability standards.

Does HER303G have AEC-Q101 qualification?

The base HER303G is not AEC-Q101 qualified; however, the HER303GH variant-identical in all electrical and thermal specifications-is explicitly qualified per AEC-Q101. The "H" suffix denotes qualification, and both parts share the same DO-201AD package and marking code except for the trailing "H".

What is the reverse recovery time (t_rr) of HER303G and how is it measured?

HER303G has a typical t_rr of 50 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A, as specified in the Electrical Specifications table. This value applies to HER301G–HER305G variants and is confirmed by the Characteristics Curves section (Fig.6 test circuit diagram).

Can HER303G replace 1N5408 in a 200 V DC application?

No-1N5408 is rated for 1000 V V_RRM but only 3 A I_F and has ~2000 ns t_rr. HER303G offers superior speed (50 ns) and lower V_F but insufficient reverse voltage margin for 1000 V use. For 200 V DC systems, HER303G is appropriate; for 1000 V, HER308G (1000 V V_RRM) is the correct family member.

HER303G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 200 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 1 V @ 3 A

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

Reverse Recovery Time (trr):: 50 ns

Current - Reverse Leakage @ Vr:: 10 µA @ 200 V

Capacitance @ Vr, F:: 60pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

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

HER303G FAQ

1.How can I place an order for HER303G through Aetrix?

Please submit a Request for Quotation (RFQ) for HER303G 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 HER303G reliable?

The price and inventory of HER303G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER303G is usually 5 days.

3.What payment methods are accepted for HER303G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER303G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HER303G?

HER303G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HER303G 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 HER303G?

For technical support, including HER303G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER303G requirements.

6.How does Aetrix verify that HER303G is sourced from the original manufacturer or authorized distributors?

All HER303G 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 HER303G meets industry standards.

7.What is the process for return or replacement of HER303G?

All HER303G units undergo pre-shipment inspection (PSI). If there is an issue with HER303G, 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 HER303G part is unused and in its original packaging.

Return procedure for HER303G:

1.Submit a request within 90 days.

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

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