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

Taiwan Semiconductor Corporation HER157G

Name: HER157G
Brand: Taiwan Semiconductor Corporation
SKU: HER157G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HER157G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-204AC, DO-15, Axial

Datasheet:: HER157G.pdf

Description:: DIODE GEN PURP 800V 1.5A DO204AC

Quantity:: RFQ Add To RFQ list

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Inventory:7,429

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Product details

Overview

HER157G from Taiwan Semiconductor is a high-efficiency, glass-passivated silicon rectifier diode rated for 1.5A average forward current and 800V repetitive peak reverse voltage (V_RRM), with 50A surge capability and 75ns reverse recovery time. It serves as a freewheeling or output rectifier in high-frequency switching power supplies.

For engineers reviewing the HER157G datasheet, HER157G pinout, HER157G application, or HER157G equivalent, key selection criteria include its 800V V_RRM, 1.7V max forward voltage at 1.5A, 20pF junction capacitance at 1MHz/4V, 150µA reverse leakage at 125°C, and DO-204AC (DO-15) package compatibility with automated assembly.

Technical Context

The HER157G uses a single-die, planar passivated junction structure optimized for fast recovery and low conduction loss in DC–DC converters and SMPS secondary-side rectification. Its 75ns trr and 1.7V V_F balance switching efficiency and thermal performance under continuous 1.5A load.

Thermally, it features a 60°C/W junction-to-ambient resistance in standard PCB mounting, enabling operation up to +150°C junction temperature. The DO-204AC package supports lead-free soldering per J-STD-002 and meets UL 94V-0 flammability requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	800 V - Maximum non-repetitive reverse voltage before breakdown; defines usable input/output isolation in 400–600V DC bus applications
I_F	1.5 A - Continuous average forward current rating at T_A = 75°C; sets minimum heatsinking requirement for sustained load
I_FSM	50 A - Peak non-repetitive surge current (8.3ms half-sine); supports inrush and transient overload without failure
V_F @ 1.5A	≤1.7 V - Forward voltage drop at rated current; directly determines conduction loss (2.55W max at full load)
t_rr	≤75 ns - Reverse recovery time; limits switching losses and EMI in >100kHz topologies
C_J @ 1MHz	20 pF - Junction capacitance at 4V reverse bias; affects high-frequency snubbing and ringing behavior
T_J max	+150 °C - Maximum allowable junction temperature; enables operation in sealed or high-ambient industrial enclosures

Pinout & Package

HER157G is housed in a DO-204AC (DO-15) axial-leaded package with cathode indicated by a band. Leads are pure tin-plated and compliant with J-STD-002 solderability standards.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side of circuit (e.g., transformer secondary center-tap or switch node)
Cathode	Forward current exit / reverse blocking terminal	Marked with band; connects to output filter capacitor positive or load return path

Key Features

Feature	Design Value
Glass passivated junction	Enables stable long-term reliability and moisture resistance without hermetic sealing
75ns reverse recovery	Reduces switching loss and diode-induced voltage spikes in 100–500kHz SMPS designs
1.7V max V_F at 1.5A	Lowers conduction loss vs. standard FR107 (1.85V), improving efficiency in compact adapters
DO-204AC (DO-15) package	Standardized footprint compatible with legacy through-hole assembly lines and reflow-reflow hybrid processes
AEC-Q101 qualified option available	Supports automotive-grade qualification when ordered as HER157GH; not inherent to base HER157G

Applications

DC–DC Converters	Switching Inverters
Use Scenario: Secondary-side synchronous or non-synchronous rectification in isolated flyback or forward converters delivering 12–48V outputs. IC Role / Device Role / Timing Role: Output rectifier converting high-frequency AC from transformer secondary into regulated DC. Use Value: 800V V_RRM accommodates reflected voltage spikes in 380V DC bus systems; 75ns t_rr minimizes dead-time loss.	Use Scenario: Freewheeling path in H-bridge motor drives or solar microinverters operating at 20–100kHz. IC Role / Device Role / Timing Role: Clamp diode providing low-loss current recirculation during MOSFET off-state. Use Value: 50A I_FSM handles motor stall currents; 20pF C_J reduces capacitive coupling noise in gate drive loops.
Industrial Power Supplies	LED Driver Circuits
Use Scenario: Input bridge or output rectification in DIN-rail mounted 24/48V PSUs for PLC and sensor interfaces. IC Role / Device Role / Timing Role: High-reliability discrete rectifier replacing higher-cost Schottky alternatives where 800V isolation is required. Use Value: +150°C T_J max allows operation in unventilated enclosures; RoHS/halogen-free compliance meets EU industrial directives.	Use Scenario: Constant-current rectification stage in offline LED drivers powering streetlight or high-bay fixtures. IC Role / Device Role / Timing Role: Primary rectifier converting rectified line voltage to bulk DC for buck/boost regulation. Use Value: 1.5A I_F supports 100–150W LED loads; 150µA IR at 125°C ensures minimal standby leakage in thermally stressed housings.

DC–DC Converters

Switching Inverters

Use Scenario: Secondary-side synchronous or non-synchronous rectification in isolated flyback or forward converters delivering 12–48V outputs.

IC Role / Device Role / Timing Role: Output rectifier converting high-frequency AC from transformer secondary into regulated DC.

Use Value: 800V V_RRM accommodates reflected voltage spikes in 380V DC bus systems; 75ns t_rr minimizes dead-time loss.

Use Scenario: Freewheeling path in H-bridge motor drives or solar microinverters operating at 20–100kHz.

IC Role / Device Role / Timing Role: Clamp diode providing low-loss current recirculation during MOSFET off-state.

Use Value: 50A I_FSM handles motor stall currents; 20pF C_J reduces capacitive coupling noise in gate drive loops.

Industrial Power Supplies

LED Driver Circuits

Use Scenario: Input bridge or output rectification in DIN-rail mounted 24/48V PSUs for PLC and sensor interfaces.

IC Role / Device Role / Timing Role: High-reliability discrete rectifier replacing higher-cost Schottky alternatives where 800V isolation is required.

Use Value: +150°C T_J max allows operation in unventilated enclosures; RoHS/halogen-free compliance meets EU industrial directives.

Use Scenario: Constant-current rectification stage in offline LED drivers powering streetlight or high-bay fixtures.

IC Role / Device Role / Timing Role: Primary rectifier converting rectified line voltage to bulk DC for buck/boost regulation.

Use Value: 1.5A I_F supports 100–150W LED loads; 150µA IR at 125°C ensures minimal standby leakage in thermally stressed housings.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1L50DJF	1.5A/1000V, 50ns t_rr, TO-220AC package, 1.85V V_F	Higher thermal mass but requires heatsink; faster recovery but higher conduction loss	Preferred for higher-power (>30W) forced-air-cooled designs needing tighter t_rr control
ES1J	1.0A/600V, 35ns t_rr, DO-204AL (SMA), 1.7V V_F	Lower voltage rating and current; surface-mount only; faster but derated for 800V use	Suitable for space-constrained 600V-class SMPS where board area is critical and surge margin is acceptable

Compared with STTH1L50DJF and ES1J, the HER157G delivers optimal balance of 800V rating, through-hole manufacturability, and 75ns recovery in cost-sensitive 15–25W industrial power supplies-without requiring heatsinks or SMT rework.

Availability

HER157G is available at Aetrix Electronics and suitable for DC–DC converters, switching inverters, and industrial power supplies requiring stable component supply, consistent parametric performance across production lots, and long-term commercial availability.

Supply support for HER157G 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 HER15xG series targets high-efficiency, high-reliability rectification in cost-sensitive switching power conversion, emphasizing robustness, thermal stability, and broad voltage scalability from 50V to 1000V.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for HER157G?

The HER157G has a V_RRM rating of 800 V, as confirmed in the Absolute Maximum Ratings table on page 2 of the Taiwan Semiconductor datasheet (Version I2105). This value is specific to HER157G and distinguishes it from adjacent variants like HER156G (600V) and HER158G (1000V). Designers must ensure applied reverse voltage remains below this limit under all operating conditions, including transients.

What is the forward voltage drop (V_F) of HER157G at 1.5A?

The HER157G exhibits a maximum forward voltage of 1.7 V at 1.5 A and T_J = 25°C, per the Electrical Specifications table (page 2). This value increases with junction temperature and is measured under pulsed conditions (PW = 0.3 ms). At elevated temperatures or DC operation, V_F may rise to ~1.85 V, affecting thermal design margins.

Does HER157G have AEC-Q101 qualification?

The base HER157G is not AEC-Q101 qualified; however, the variant HER157GH (ordering code with "H" suffix) is explicitly qualified per AEC-Q101. This distinction is documented in the Ordering Information section (page 2). Standard HER157G is intended for industrial and commercial applications, not automotive safety-critical systems.

What is the reverse recovery time (t_rr) of HER157G?

The HER157G has a maximum reverse recovery time of 75 ns, measured at I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A (page 2, Electrical Specifications). This value applies to HER156G, HER157G, and HER158G only; lower-voltage variants (HER151G–HER155G) are rated at ≤50 ns. Designers should verify layout parasitics do not extend effective t_rr in high-dI/dt circuits.

What package type does HER157G use?

The HER157G uses the DO-204AC (also known as DO-15) axial-leaded package, as specified in Mechanical Data and Package Outline Dimensions (pages 1 and 5). It features tin-plated leads compliant with J-STD-002, UL 94V-0 molding compound, and cathode polarity marked by a band. This package supports both wave and selective soldering processes.

HER157G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-204AC, DO-15, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 800 V

Current - Average Rectified (Io):: 1.5A

Voltage - Forward (Vf) (Max) @ If:: 1 V @ 1.5 A

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

Reverse Recovery Time (trr):: 75 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 800 V

Capacitance @ Vr, F:: 20pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AC (DO-15)

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

HER157G FAQ

1.How can I place an order for HER157G through Aetrix?

Please submit a Request for Quotation (RFQ) for HER157G 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 HER157G reliable?

The price and inventory of HER157G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER157G is usually 5 days.

3.What payment methods are accepted for HER157G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER157G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HER157G?

HER157G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HER157G 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 HER157G?

For technical support, including HER157G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER157G requirements.

6.How does Aetrix verify that HER157G is sourced from the original manufacturer or authorized distributors?

All HER157G 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 HER157G meets industry standards.

7.What is the process for return or replacement of HER157G?

All HER157G units undergo pre-shipment inspection (PSI). If there is an issue with HER157G, 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 HER157G part is unused and in its original packaging.

Return procedure for HER157G:

1.Submit a request within 90 days.

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

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