Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Taiwan Semiconductor Corporation HER154G-T

Name: HER154G-T
Brand: Taiwan Semiconductor Corporation
SKU: HER154G-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: HER154G-T

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

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

Datasheet:: HER154G-T.pdf

Description:: 50NS, 1.5A, 300V, HIGH EFFICIENT

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:9,026

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

HER154G-T from Taiwan Semiconductor is a high-efficiency, glass-passivated silicon rectifier diode rated for 1.5A average forward current and 300V repetitive peak reverse voltage (V_RRM), with 1.0V typical forward voltage at 1.5A and 25°C junction temperature. It serves as a primary output rectifier in compact DC-DC converters and switching-mode power supplies where low conduction loss and fast recovery are critical.

For engineers reviewing the HER154G-T datasheet, HER154G-T pinout, HER154G-T application, or HER154G-T equivalent, key selection criteria include its DO-204AC (DO-15) package, 50ns reverse recovery time, 50A surge capability, thermal resistance of 60°C/W, and compliance with RoHS and halogen-free standards per IEC 61249-2-21.

Technical Context

This device is a single-die, unidirectional, standard-recovery rectifier optimized for medium-voltage, medium-current switching applications. Its 300V V_RRM, 1.0V V_F at 1.5A, and 50ns t_rr reflect a balanced trade-off between blocking capability, conduction efficiency, and dynamic performance-distinct from ultrafast (t_rr < 35ns) or Schottky alternatives.

The DO-204AC (DO-15) package enables through-hole mounting with pure tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 1A whisker resistance. Junction-to-ambient thermal resistance is fixed at 60°C/W under standard PCB conditions, limiting continuous power dissipation to ~0.42W at T_A = 25°C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	300 V - Maximum non-repetitive reverse voltage the diode blocks without breakdown; defines usable input/output voltage range in flyback or buck-derived topologies.
I_F	1.5 A - Continuous average forward current rating at 25°C ambient; derates linearly above 25°C per forward current derating curve.
V_F	1.0 V (typ) @ 1.5A, 25°C - Forward conduction drop directly impacts conduction loss (P_cond ≈ I_F × V_F) and thermal load in high-duty-cycle operation.
t_rr	50 ns - Reverse recovery time measured at I_F = 0.5A, I_R = 1.0A, I_rr = 0.25A; determines switching loss and EMI generation during turn-off in hard-switched converters.
I_FSM	50 A - Non-repetitive surge current (8.3ms half-sine) tolerance; supports inrush current handling and transient overload resilience.
R_θJA	60 °C/W - Thermal resistance from junction to ambient; sets maximum allowable power dissipation (≈0.42W at T_A = 25°C) before reaching 150°C max junction temperature.

Pinout & Package

HER154G-T uses the DO-204AC (DO-15) axial-leaded package with cathode indicated by a band on the body. Leads are pure tin-plated and solderable per J-STD-002. Polarity is unambiguous: banded end is cathode; opposite end is anode.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., transformer secondary center-tap or switch node in flyback); must withstand full forward surge current.
Cathode	Forward current exit point	Connected to output capacitor positive rail; carries full load current and defines output reference polarity; marked by visible band.

Key Features

Feature	Design Value
Glass passivated junction	Enhances long-term reliability and moisture resistance versus epoxy-passivated devices; critical for industrial environments with humidity cycling.
Low V_F (1.0V typ)	Reduces conduction losses by ~15–20% compared to legacy 1N400x series at same current, improving efficiency in 12–48V output converters.
50A I_FSM rating	Supports startup surges and short-duration overloads without degradation-enables smaller input bulk capacitors and relaxed fuse sizing.
RoHS & halogen-free	Meets IEC 61249-2-21; eliminates brominated flame retardants and supports lead-free assembly and green product compliance requirements.

Applications

DC-DC Converter Output Rectification	Switching Mode Inverter Freewheeling
Use Scenario: Used as the main output rectifier in isolated 12V/24V/48V DC-DC converters with 100–500kHz switching frequency. IC Role / Device Role / Timing Role: Unidirectional current valve converting high-frequency AC from transformer secondary into regulated DC output. Use Value: 1.0V V_F minimizes conduction loss at 1.5A load; 50ns t_rr limits switching loss and EMI during turn-off transitions.	Use Scenario: Placed across inductive loads (e.g., motor windings or relay coils) in H-bridge or half-bridge inverters. IC Role / Device Role / Timing Role: Provides low-impedance path for inductive kickback current during switch-off, preventing voltage spikes. Use Value: 300V V_RRM safely clamps transients up to 300V; 50A I_FSM handles repetitive energy recirculation without thermal runaway.
AC-DC Adapter Secondary Side	Industrial Power Supply Input Stage
Use Scenario: Rectifies transformer secondary output in compact wall adapters delivering ≤18W at 5–12V. IC Role / Device Role / Timing Role: Standard-recovery rectifier replacing slower 1N4007 in cost-sensitive, thermally constrained designs. Use Value: DO-15 package fits legacy footprints; 1.0V V_F improves light-load efficiency over 1N4007 (1.1V min), extending battery life in portable chargers.	Use Scenario: Used in auxiliary bias supplies or control-rail rectification within programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: Provides stable, low-loss DC for gate drivers and microcontroller rails in harsh industrial environments. Use Value: Glass passivation and 150°C T_JMAX ensure operational integrity at elevated ambient temperatures (>70°C); RoHS/halogen-free compliance meets EU industrial directives.

DC-DC Converter Output Rectification

Switching Mode Inverter Freewheeling

Use Scenario: Used as the main output rectifier in isolated 12V/24V/48V DC-DC converters with 100–500kHz switching frequency.

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

Use Value: 1.0V V_F minimizes conduction loss at 1.5A load; 50ns t_rr limits switching loss and EMI during turn-off transitions.

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

IC Role / Device Role / Timing Role: Provides low-impedance path for inductive kickback current during switch-off, preventing voltage spikes.

Use Value: 300V V_RRM safely clamps transients up to 300V; 50A I_FSM handles repetitive energy recirculation without thermal runaway.

AC-DC Adapter Secondary Side

Industrial Power Supply Input Stage

Use Scenario: Rectifies transformer secondary output in compact wall adapters delivering ≤18W at 5–12V.

IC Role / Device Role / Timing Role: Standard-recovery rectifier replacing slower 1N4007 in cost-sensitive, thermally constrained designs.

Use Value: DO-15 package fits legacy footprints; 1.0V V_F improves light-load efficiency over 1N4007 (1.1V min), extending battery life in portable chargers.

Use Scenario: Used in auxiliary bias supplies or control-rail rectification within programmable logic controller (PLC) power modules.

IC Role / Device Role / Timing Role: Provides stable, low-loss DC for gate drivers and microcontroller rails in harsh industrial environments.

Use Value: Glass passivation and 150°C T_JMAX ensure operational integrity at elevated ambient temperatures (>70°C); RoHS/halogen-free compliance meets EU industrial directives.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1L06U	600V V_RRM, 1.0A I_F, 65ns t_rr, TO-220AC package	Higher voltage rating but lower current; requires heatsink for >0.5A continuous use	Prefer when higher blocking voltage is needed and board space allows TO-220 footprint
SB1530	30V V_RRM, 1.5A I_F, Schottky, 0.45V V_F, DO-204AC	Lower V_RRM; no reverse recovery; unsuitable for >30V circuits	Choose only for low-voltage (<24V) applications where ultra-low V_F outweighs voltage limitation

Compared with STTH1L06U and SB1530, HER154G-T uniquely balances 300V blocking, 1.5A current, 1.0V V_F, and DO-15 compatibility-making it optimal for mid-range industrial and telecom DC-DC outputs where thermal, voltage, and footprint constraints intersect.

Availability

HER154G-T is available at Aetrix Electronics and suitable for DC-DC converter output rectification, switching mode inverter freewheeling, and AC-DC adapter secondary-side applications requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.

Supply support for HER154G-T 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, MOSFETs, and LED drivers.

The HER15xG-T series was designed specifically for high-efficiency, medium-voltage switching power conversion-targeting cost-sensitive yet thermally demanding applications in industrial power supplies, telecom infrastructure, and consumer adapters.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for HER154G-T?

The HER154G-T has a V_RRM of 300V, as confirmed in the Absolute Maximum Ratings table for the HER154G-T row. This value is fixed for this specific variant and differs from other members of the HER15xG-T family (e.g., HER153G-T = 200V, HER155G-T = 400V). Exceeding 300V risks irreversible avalanche breakdown.

What is the forward voltage (V_F) of HER154G-T under standard operating conditions?

The HER154G-T exhibits a typical forward voltage of 1.0V at 1.5A forward current and 25°C junction temperature, per the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3ms) and represents conduction loss under nominal load-critical for calculating thermal rise and efficiency in DC-DC designs using HER154G-T.

Does HER154G-T have a specified reverse recovery time (t_rr)?

Yes, HER154G-T has a maximum reverse recovery time of 50ns, tested at I_F = 0.5A, I_R = 1.0A, and I_rr = 0.25A. This parameter is explicitly listed in the Electrical Specifications table for HER154G-T and distinguishes it from slower general-purpose rectifiers like the 1N4007 (t_rr > 2µs), making HER154G-T suitable for higher-frequency switching.

What package type does HER154G-T use, and how is polarity identified?

HER154G-T uses the DO-204AC (DO-15) axial-leaded package. Polarity is identified by a cathode band on the body-this banded end is the cathode terminal, while the opposite lead is the anode. The package features pure tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 1A whisker resistance.

Is HER154G-T compliant with environmental regulations such as RoHS and halogen-free standards?

Yes, HER154G-T is RoHS compliant and halogen-free per IEC 61249-2-21. These compliance statements appear in the FEATURES section of the official Taiwan Semiconductor datasheet (Version B2105) and apply specifically to the HER154G-T variant, confirming suitability for environmentally regulated markets including EU industrial and consumer electronics.

HER154G-T 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):: 300 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):: 50 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 300 V

Capacitance @ Vr, F:: 35pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

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

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

HER154G-T FAQ

1.How can I place an order for HER154G-T through Aetrix?

Please submit a Request for Quotation (RFQ) for HER154G-T 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 HER154G-T reliable?

The price and inventory of HER154G-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER154G-T is usually 5 days.

3.What payment methods are accepted for HER154G-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER154G-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HER154G-T?

HER154G-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HER154G-T 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 HER154G-T?

For technical support, including HER154G-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER154G-T requirements.

6.How does Aetrix verify that HER154G-T is sourced from the original manufacturer or authorized distributors?

All HER154G-T 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 HER154G-T meets industry standards.

7.What is the process for return or replacement of HER154G-T?

All HER154G-T units undergo pre-shipment inspection (PSI). If there is an issue with HER154G-T, 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 HER154G-T part is unused and in its original packaging.

Return procedure for HER154G-T:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…