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

Taiwan Semiconductor Corporation BY254G

Name: BY254G
Brand: Taiwan Semiconductor Corporation
SKU: BY254G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BY254G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: BY254G.pdf

Description:: 3A, 800V, STANDARD RECOVERY RECT

Quantity:: RFQ Add To RFQ list

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Inventory:1,150

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Product details

Overview

BY254G from Taiwan Semiconductor is a single-die standard rectifier diode rated for 800 V repetitive peak reverse voltage (VRRM), 3 A average forward current (IF), and 150 A non-repetitive surge current (IFSM), used in high-efficiency DC-DC converters and switching-mode inverters where high-voltage blocking and thermal robustness are required.

For engineers reviewing the BY254G datasheet, BY254G pinout, BY254G application, or BY254G equivalent, key selection criteria include its DO-201AD package, 1.0 V max forward voltage at 3 A, 5 µA max reverse leakage at 25°C, 40 pF junction capacitance, and 40 °C/W junction-to-ambient thermal resistance.

Technical Context

The BY254G operates as a unidirectional silicon PN junction rectifier with a single die in axial DO-201AD packaging. Its 800 V VRRM rating enables use in 400–600 V DC bus applications, while its 150 A IFSM supports transient overload handling in SMPS front-end stages.

Thermal performance is defined by R_θJA = 40 °C/W and T_J_MAX = 150 °C, with reverse leakage tightly specified at 5 µA (25°C) and 100 µA (125°C), confirming stable operation across industrial temperature ranges.

Key Specifications

Parameter	Value and Actual Design Meaning
VRRM	800 V - blocks up to 800 V reverse voltage without breakdown, suitable for 600 V-class DC link circuits
IF	3 A - continuous forward current rating at TA = 75°C, defines steady-state power conversion capacity
IFSM	150 A - withstands 8.3 ms half-sine surge, critical for inrush and fault-current resilience
VF (max)	1.0 V @ 3 A, 25°C - low conduction loss enabling >92% efficiency in 12–48 V output converters
IR (max)	5 µA @ 800 V, 25°C - minimal leakage preserves standby power budget in offline supplies
CJ	40 pF @ 4 V, 1 MHz - limits high-frequency switching noise and EMI in >100 kHz topologies
R_θJA	40 °C/W - determines heatsink requirement for 3 A operation in natural convection environments

Pinout & Package

DO-201AD axial package with cathode band marking; two-terminal device (anode and cathode) in molded epoxy case meeting UL 94V-0, pure tin-plated leads per J-STD-002, and JESD 201 Class 1A whisker resistance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry node	Connected to input/positive side of AC source or transformer secondary; polarity must align with circuit current flow direction
Cathode	Forward current exit node	Marked by colored band; connects to output/load side; reverse-biased during off-state to block 800 V

Key Features

Feature	Design Value
High surge current capability	150 A IFSM enables reliable operation during cold-start and short-circuit events in industrial SMPS
Low forward voltage	1.0 V max VF at rated 3 A reduces conduction losses by ~15% vs. legacy 1.2 V rectifiers
RoHS & halogen-free compliance	Meets IEC 61249-2-21 and EU RoHS directives for environmentally constrained end equipment
UL 94V-0 molding compound	Self-extinguishing encapsulation ensures flame resistance in safety-critical power supplies

Applications

DC-DC Converter	Switching Inverter
Use Scenario: Isolated flyback or forward converter in telecom power supplies delivering 12–48 V outputs from 370 V DC bus. IC Role / Device Role / Timing Role: Output rectifier conducting during transformer secondary positive half-cycle; handles 3 A continuous and 150 A surge. Use Value: 1.0 V VF minimizes power loss at full load; 800 V VRRM provides 2× safety margin over 370 V bus.	Use Scenario: Single-phase H-bridge inverter driving induction motors in HVAC compressors. IC Role / Device Role / Timing Role: Freewheeling diode clamping inductive kickback during PWM dead-time intervals. Use Value: 150 A IFSM absorbs motor regeneration spikes; 40 pF CJ limits dv/dt-induced shoot-through risk.
Industrial SMPS Front-End	LED Driver Power Stage
Use Scenario: Bridge rectifier in universal-input (90–264 VAC) 300 W industrial SMPS feeding PFC stage. IC Role / Device Role / Timing Role: Input rectification element converting AC line to pulsating DC; conducts 3 A average at 100 Hz ripple frequency. Use Value: 150°C TJ_MAX and 40 °C/W R_θJA sustain reliability under sustained ambient temperatures up to 70°C.	Use Scenario: Secondary-side rectifier in constant-current LED driver powering high-bay luminaires (100–200 W). IC Role / Device Role / Timing Role: High-voltage output rectifier operating at 400–600 V DC link with 3 A average current. Use Value: 5 µA IR at 25°C ensures negligible standby leakage; DO-201AD mechanical robustness supports automated assembly.

DC-DC Converter

Switching Inverter

Use Scenario: Isolated flyback or forward converter in telecom power supplies delivering 12–48 V outputs from 370 V DC bus.

IC Role / Device Role / Timing Role: Output rectifier conducting during transformer secondary positive half-cycle; handles 3 A continuous and 150 A surge.

Use Value: 1.0 V VF minimizes power loss at full load; 800 V VRRM provides 2× safety margin over 370 V bus.

Use Scenario: Single-phase H-bridge inverter driving induction motors in HVAC compressors.

IC Role / Device Role / Timing Role: Freewheeling diode clamping inductive kickback during PWM dead-time intervals.

Use Value: 150 A IFSM absorbs motor regeneration spikes; 40 pF CJ limits dv/dt-induced shoot-through risk.

Industrial SMPS Front-End

LED Driver Power Stage

Use Scenario: Bridge rectifier in universal-input (90–264 VAC) 300 W industrial SMPS feeding PFC stage.

IC Role / Device Role / Timing Role: Input rectification element converting AC line to pulsating DC; conducts 3 A average at 100 Hz ripple frequency.

Use Value: 150°C TJ_MAX and 40 °C/W R_θJA sustain reliability under sustained ambient temperatures up to 70°C.

Use Scenario: Secondary-side rectifier in constant-current LED driver powering high-bay luminaires (100–200 W).

IC Role / Device Role / Timing Role: High-voltage output rectifier operating at 400–600 V DC link with 3 A average current.

Use Value: 5 µA IR at 25°C ensures negligible standby leakage; DO-201AD mechanical robustness supports automated assembly.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3L08S (STMicroelectronics)	800 V VRRM, 3 A IF, but TO-220AC package (vs. DO-201AD); VF = 1.15 V max	Requires PCB footprint change and heatsinking; better for forced-air cooled designs	Select when higher thermal mass or mounting flexibility is needed over axial lead constraints
1N5408G (ON Semiconductor)	1000 V VRRM, 3 A IF, DO-201AD package, but VF = 1.2 V max and IFSM = 120 A	Higher voltage margin but lower surge tolerance and higher conduction loss	Prefer for cost-sensitive 1000 V designs where 150 A surge is not required

Compared with STTH3L08S and 1N5408G, the BY254G delivers optimal balance of 800 V rating, 150 A surge capability, and 1.0 V VF in the space-constrained DO-201AD form factor-making it ideal for compact, high-reliability industrial converters where axial mounting and thermal efficiency are prioritized.

Availability

BY254G is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and industrial SMPS requiring stable component supply with consistent DO-201AD packaging and 800 V/3 A performance.

Supply support for BY254G 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 consumer markets.

The BY254G belongs to TSC's BY25xG standard rectifier family, engineered for high-efficiency, high-reliability AC/DC and DC/DC power conversion in cost-sensitive yet thermally demanding applications.

FAQ

What is the maximum junction temperature rating for BY254G?

The BY254G has a maximum junction temperature (T_J_MAX) of +150°C, verified per absolute maximum ratings in the official TSC datasheet. This allows reliable operation in industrial ambient environments up to 70°C when mounted on PCBs with adequate copper area or minimal heatsinking. The BY254G's thermal resistance (R_θJA = 40 °C/W) supports this rating under natural convection conditions.

Does BY254G have RoHS and halogen-free compliance?

Yes, the BY254G is RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the "Features" section of the TSC BY251G–BY254G datasheet (Version D2105). The device uses UL 94V-0 molding compound and pure tin-plated leads, satisfying environmental requirements for commercial and industrial end equipment.

What is the forward voltage specification for BY254G at full rated current?

The BY254G has a maximum forward voltage (V_F) of 1.0 V at 3 A forward current and 25°C junction temperature, measured under pulsed conditions (PW = 0.3 ms). This value is critical for calculating conduction losses in high-efficiency power supplies; actual V_F decreases slightly at elevated temperatures but remains below 1.05 V up to 125°C.

Is BY254G suitable for use in bridge rectifier configurations?

Yes, the BY254G is commonly used in single-phase full-wave bridge rectifiers due to its 800 V VRRM rating, 3 A average current capability, and DO-201AD package compatibility with standard axial layouts. Four BY254G diodes can configure a 800 V, 3 A bridge for universal-input SMPS, provided layout accounts for thermal coupling and peak inverse voltage distribution.

What is the reverse leakage current of BY254G at elevated temperature?

The BY254G exhibits a maximum reverse leakage current (I_R) of 100 µA at 800 V and 125°C junction temperature, as specified in the Electrical Specifications table. At 25°C, leakage is limited to 5 µA-enabling low standby power consumption in energy-efficient designs. This temperature-dependent behavior is typical of silicon rectifiers and must be accounted for in high-temperature thermal design.

BY254G 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):: 800 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):: -

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

Capacitance @ Vr, F:: 40pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

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

BY254G FAQ

1.How can I place an order for BY254G through Aetrix?

Please submit a Request for Quotation (RFQ) for BY254G 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 BY254G reliable?

The price and inventory of BY254G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BY254G is usually 5 days.

3.What payment methods are accepted for BY254G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BY254G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BY254G?

BY254G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BY254G 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 BY254G?

For technical support, including BY254G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BY254G requirements.

6.How does Aetrix verify that BY254G is sourced from the original manufacturer or authorized distributors?

All BY254G 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 BY254G meets industry standards.

7.What is the process for return or replacement of BY254G?

All BY254G units undergo pre-shipment inspection (PSI). If there is an issue with BY254G, 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 BY254G part is unused and in its original packaging.

Return procedure for BY254G:

1.Submit a request within 90 days.

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

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