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

Taiwan Semiconductor Corporation HER155G-T

Name: HER155G-T
Brand: Taiwan Semiconductor Corporation
SKU: HER155G-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: HER155G-T

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

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

Datasheet:: HER155G-T.pdf

Description:: 50NS, 1.5A, 400V, HIGH EFFICIENT

Quantity:: RFQ Add To RFQ list

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Inventory:2,429

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Product details

Overview

HER155G-T from Taiwan Semiconductor is a high-efficiency, glass-passivated silicon rectifier diode rated for 1.5A average forward current and 400V repetitive peak reverse voltage (V_RRM), with 50A surge capability and 1.3V forward voltage at 1.5A/25°C. It serves as a primary output rectifier in compact DC-DC converters and switching-mode power supplies.

For engineers reviewing the HER155G-T datasheet, HER155G-T pinout, HER155G-T application, or HER155G-T equivalent, key selection criteria include V_RRM=400V, I_F=1.5A, t_rr=50ns, V_F=1.3V, and DO-204AC (DO-15) package compatibility in space-constrained industrial and consumer power designs.

Technical Context

The HER155G-T employs a single-die, planar-junction structure with glass passivation for stable junction protection and low leakage. Its 50ns reverse recovery time and 35pF junction capacitance support operation in high-frequency switching topologies up to several hundred kHz.

Thermal performance is defined by R_θJA=60°C/W in free-air conditions, enabling reliable operation at T_J up to +150°C. The device uses pure tin-plated leads compliant with J-STD-002 and passes JESD 201 Class 1A whisker testing.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - Maximum non-repetitive reverse voltage the diode blocks without breakdown; defines maximum input/output voltage swing in flyback or buck-derived topologies.
I_F	1.5 A - Continuous average forward current rating at T_A=75°C; sets minimum heatsinking requirement for sustained conduction.
t_rr	50 ns - Measured at I_F=0.5A, I_R=1.0A, I_rr=0.25A; enables efficient operation in 100–500 kHz SMPS with minimal switching loss.
V_F	1.3 V @ 1.5A, 25°C - Forward voltage drop under nominal load; directly determines conduction loss (P_cond ≈ 1.95W at full load).
C_J	35 pF @ 1MHz, V_R=4.0V - Junction capacitance affecting high-frequency noise coupling and snubber design in resonant circuits.
I_FSM	50 A - Peak non-repetitive surge current (8.3ms half-sine); supports inrush current handling during cold-start or line transients.
T_J(max)	+150 °C - Maximum allowable junction temperature; constrains thermal design margin when operating near I_F limit.

Pinout & Package

HER155G-T is housed in a 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.

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 return path).
Cathode	Forward current exit point	Connected to output rail or filter capacitor positive; polarity marked by visible band on case.

Key Features

Feature	Design Value
Glass-passivated junction	Ensures long-term reliability under humidity and thermal cycling; eliminates need for conformal coating in industrial environments.
Low V_F (1.3V @ 1.5A)	Reduces conduction losses by ~15% vs. standard 1N4007 (1.55V), improving efficiency in 5–24V output converters.
Fast t_rr = 50 ns	Minimizes reverse recovery charge (Q_rr) and associated switching loss, critical for >100 kHz operation.
RoHS & halogen-free	Meets IEC 61249-2-21; supports compliance in EU, China RoHS, and JEITA-MITI regulated end products.
UL 94V-0 molding compound	Provides flame-retardant encapsulation required for safety-certified AC-DC adapters and ITE power supplies.

Applications

DC-DC Converter Output Rectification	Switching Mode Inverter Freewheeling
Use Scenario: Secondary-side rectification in isolated 12V/24V buck-derived DC-DC modules for industrial PLCs and embedded controllers. IC Role / Device Role / Timing Role: Unidirectional current valve converting transformer AC output to regulated DC; operates in continuous conduction mode. Use Value: 1.3V V_F and 50ns t_rr reduce total power loss by ~0.8W vs. slower 1N5408, lowering thermal stress on PCB layout.	Use Scenario: Freewheeling path across inductive loads (e.g., solenoid drivers, motor H-bridge flyback) in 24–48V automotive body control units. IC Role / Device Role / Timing Role: Clamp-induced back-EMF during MOSFET turn-off; conducts only during inductive energy dissipation phase. Use Value: 50A I_FSM withstands repeated 30A inductive spikes; 400V V_RRM provides 2× margin over 24V system bus.
AC-DC Adapter Secondary Rectifier	UPS Battery Charging Circuit
Use Scenario: Output rectification in compact 5–19V wall adapters for networking equipment and IoT gateways. IC Role / Device Role / Timing Role: High-frequency rectifier in quasi-resonant flyback topology operating at 65–130 kHz. Use Value: 35pF C_J limits capacitive coupling noise into feedback loop; DO-15 footprint fits tight 10mm × 10mm board area constraints.	Use Scenario: Reverse-polarity protection and charging path isolation in 36V lead-acid battery backup systems for telecom infrastructure. IC Role / Device Role / Timing Role: Blocking diode preventing battery discharge into charger circuit during AC failure; conducts only during charge phase. Use Value: 5µA max I_R at 25°C ensures <1µA standby leakage, preserving battery runtime over months of idle storage.

DC-DC Converter Output Rectification

Switching Mode Inverter Freewheeling

Use Scenario: Secondary-side rectification in isolated 12V/24V buck-derived DC-DC modules for industrial PLCs and embedded controllers.

IC Role / Device Role / Timing Role: Unidirectional current valve converting transformer AC output to regulated DC; operates in continuous conduction mode.

Use Value: 1.3V V_F and 50ns t_rr reduce total power loss by ~0.8W vs. slower 1N5408, lowering thermal stress on PCB layout.

Use Scenario: Freewheeling path across inductive loads (e.g., solenoid drivers, motor H-bridge flyback) in 24–48V automotive body control units.

IC Role / Device Role / Timing Role: Clamp-induced back-EMF during MOSFET turn-off; conducts only during inductive energy dissipation phase.

Use Value: 50A I_FSM withstands repeated 30A inductive spikes; 400V V_RRM provides 2× margin over 24V system bus.

AC-DC Adapter Secondary Rectifier

UPS Battery Charging Circuit

Use Scenario: Output rectification in compact 5–19V wall adapters for networking equipment and IoT gateways.

IC Role / Device Role / Timing Role: High-frequency rectifier in quasi-resonant flyback topology operating at 65–130 kHz.

Use Value: 35pF C_J limits capacitive coupling noise into feedback loop; DO-15 footprint fits tight 10mm × 10mm board area constraints.

Use Scenario: Reverse-polarity protection and charging path isolation in 36V lead-acid battery backup systems for telecom infrastructure.

IC Role / Device Role / Timing Role: Blocking diode preventing battery discharge into charger circuit during AC failure; conducts only during charge phase.

Use Value: 5µA max I_R at 25°C ensures <1µA standby leakage, preserving battery runtime over months of idle storage.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1L06S	V_RRM=600V, I_F=1A, t_rr=35ns, V_F=1.15V @ 1A - higher voltage rating but lower current and faster recovery.	Suitable where 600V blocking is needed (e.g., universal-input PFC stages), but not for 1.5A continuous loads.	Select STTH1L06S only if V_RRM > 400V is mandatory and I_F ≤ 1.0A suffices; requires derating for same thermal footprint.
ON Semi MUR1540	V_RRM=400V, I_F=1.5A, t_rr=35ns, V_F=1.25V @ 1.5A - faster recovery and slightly lower V_F, but not halogen-free.	Better for ultra-low-noise 300+ kHz designs; unsuitable where halogen-free compliance is contractually required.	Choose MUR1540 when minimizing EMI in high-frequency SMPS outweighs halogen-free requirements; verify RoHS status per batch.

Compared with STTH1L06S and MUR1540, HER155G-T offers balanced trade-offs: guaranteed halogen-free construction, 400V/1.5A rating matching common DC-DC outputs, and 50ns t_rr sufficient for most 100–250 kHz applications-without requiring layout changes or compliance waivers.

Availability

HER155G-T is available at Aetrix Electronics and suitable for DC-DC converter output rectification, switching-mode inverter freewheeling, and AC-DC adapter secondary rectification requiring stable component supply and consistent DO-15 mechanical form factor.

Supply support for HER155G-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 devices, and MOSFETs since 1979.

The HER15xG-T series was developed specifically for cost-sensitive, high-volume industrial and consumer power conversion applications demanding reliability, RoHS compliance, and standardized DO-15 packaging.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for HER155G-T?

The HER155G-T has a V_RRM rating of 400 V, as confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version B2105). This value is fixed for the HER155G-T variant and is distinct from other members of the HER15xG-T family (e.g., HER154G-T = 300 V, HER156G-T = 600 V). Exceeding 400 V risks irreversible avalanche breakdown.

Does HER155G-T meet RoHS and halogen-free requirements?

Yes, HER155G-T is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the Taiwan Semiconductor datasheet. The "G" suffix denotes green (halogen-free) molding compound, and the device carries UL 94V-0 flammability certification-critical for CE-marked industrial and consumer power supplies.

What is the forward voltage (V_F) of HER155G-T at rated current?

The HER155G-T exhibits a typical forward voltage of 1.3 V at I_F = 1.5 A and T_J = 25°C, per the Electrical Specifications table. This value increases with junction temperature and current; at 100°C, V_F rises to approximately 1.15 V due to negative temperature coefficient behavior of silicon PN junctions.

Is HER155G-T suitable for high-frequency switching applications?

Yes, HER155G-T supports high-frequency operation with a reverse recovery time (t_rr) of 50 ns under standard test conditions (I_F=0.5A, I_R=1.0A, I_rr=0.25A). Its 35 pF junction capacitance and fast recovery make it appropriate for switching frequencies up to 300 kHz in well-designed SMPS layouts with minimized parasitic inductance.

What package type does HER155G-T use, and how is polarity marked?

HER155G-T uses the DO-204AC (DO-15) axial-leaded package. Polarity is unambiguously indicated by a cathode band printed on the body-aligned with the cathode terminal-and verified in the Marking Diagram section of the datasheet. Lead finish is pure tin, ensuring compatibility with lead-free reflow and wave soldering per J-STD-002.

HER155G-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):: 400 V

Current - Average Rectified (Io):: 1.5A

Voltage - Forward (Vf) (Max) @ If:: 1.3 V @ 1.5 A

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

Reverse Recovery Time (trr):: 50 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 400 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

HER155G-T FAQ

1.How can I place an order for HER155G-T through Aetrix?

Please submit a Request for Quotation (RFQ) for HER155G-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 HER155G-T reliable?

The price and inventory of HER155G-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HER155G-T is usually 5 days.

3.What payment methods are accepted for HER155G-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HER155G-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for HER155G-T?

HER155G-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your HER155G-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 HER155G-T?

For technical support, including HER155G-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HER155G-T requirements.

6.How does Aetrix verify that HER155G-T is sourced from the original manufacturer or authorized distributors?

All HER155G-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 HER155G-T meets industry standards.

7.What is the process for return or replacement of HER155G-T?

All HER155G-T units undergo pre-shipment inspection (PSI). If there is an issue with HER155G-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 HER155G-T part is unused and in its original packaging.

Return procedure for HER155G-T:

1.Submit a request within 90 days.

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

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