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

Taiwan Semiconductor Corporation BA157G-K

Name: BA157G-K
Brand: Taiwan Semiconductor Corporation
SKU: BA157G-K
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BA157G-K

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: BA157G-K.pdf

Description:: 500NS, 1A, 400V, FAST RECOVERY R

Quantity:: RFQ Add To RFQ list

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Inventory:8,575

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Product details

Overview

BA157G-K from Taiwan Semiconductor is a single-die, fast recovery rectifier diode in DO-204AL (DO-41) package, rated for 1 A average forward current and 400 V repetitive peak reverse voltage, with 30 A surge capability and 500 ns reverse recovery time - used in compact AC/DC adapters and offline SMPS input stages.

For engineers reviewing the BA157G-K datasheet, BA157G-K pinout, BA157G-K application, or BA157G-K equivalent, key selection criteria include its 400 V V_RRM, 1.3 V max forward voltage at 1 A, 5 µA max reverse leakage at 25°C, DO-41 mechanical compatibility, and fast recovery performance critical for high-frequency switching efficiency.

Technical Context

The BA157G-K employs a glass-passivated silicon junction to ensure stable operation up to 150°C junction temperature and withstand 30 A non-repetitive surge current (8.3 ms half-sine). Its 500 ns trr enables use in 50–100 kHz SMPS topologies where low switching loss is required.

Thermal resistance is specified at 60°C/W (junction-to-ambient), and the device features pure tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 1A whisker resistance - supporting automated assembly in industrial power supplies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - maximum repetitive reverse blocking voltage before breakdown; defines safe AC input voltage derating in bridge or single-diode configurations
I_F	1 A - continuous average forward current rating at 75°C ambient; determines heatsink-free operation in low-power adapters
I_FSM	30 A - peak non-repetitive surge current (8.3 ms); supports inrush current handling during cold-start of power supplies
t_rr	500 ns - reverse recovery time under IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A; limits switching losses in 50–100 kHz converters
V_F	1.3 V max at I_F = 1 A, T_J = 25°C - forward voltage drop directly impacts conduction loss and thermal rise in linear-regulated or flyback outputs
R_θJA	60 °C/W - junction-to-ambient thermal resistance; enables thermal design without forced airflow in enclosed adapter housings

Pinout & Package

Package: DO-204AL (DO-41), axial-leaded, glass-passivated, RoHS-compliant, halogen-free molding compound (UL 94V-0), cathode indicated by band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to AC input or transformer secondary; must withstand full surge current and reverse voltage stress
Cathode	Forward current exit / reverse blocking terminal	Marked with band; ties to output capacitor or ground return; carries full load current and reverse recovery charge

Key Features

Feature	Design Value
Glass passivated junction	Enables stable long-term reliability and moisture resistance in unsealed power adapter environments
Low V_F (1.3 V max)	Reduces conduction loss by ~15% vs. standard recovery diodes, improving efficiency in 5–15 W offline supplies
Fast t_rr (500 ns)	Minimizes reverse recovery energy loss in discontinuous conduction mode (DCM) flyback converters
Pure tin-plated leads	Ensures consistent solder wetting and intermetallic formation in lead-free reflow processes per J-STD-002

Applications

AC/DC Adapters	Offline SMPS Input Stage
Use Scenario: Wall-mounted 5–12 V, 1–2 A power adapters for consumer electronics. IC Role / Device Role / Timing Role: Single-phase rectifier converting 90–264 VAC to pulsating DC prior to bulk capacitor filtering. Use Value: 400 V V_RRM provides 2× safety margin over 264 VAC peak (373 V), while 1.3 V V_F limits self-heating in sealed enclosures.	Use Scenario: Primary-side input rectification in 10–25 W flyback converters for LED drivers and IoT gateways. IC Role / Device Role / Timing Role: Fast recovery diode in voltage-doubler or bridge configuration feeding the primary winding. Use Value: 500 ns t_rr reduces switching node ringing and EMI generation compared to general-purpose rectifiers.
DC-DC Converter Front-End	Industrial Control Power Supply
Use Scenario: 24 V input DC-DC modules accepting wide-range 18–36 VDC with transient protection. IC Role / Device Role / Timing Role: Polarity protection and input surge clamping diode on the DC input rail. Use Value: 30 A I_FSM handles 100 ms load dump transients; DO-41 form factor allows direct through-hole mounting on control board edges.	Use Scenario: Auxiliary 5 V/3.3 V bias supply in PLC I/O modules operating at 55°C ambient. IC Role / Device Role / Timing Role: Secondary-side output rectifier in isolated flyback supplying logic rails. Use Value: 150°C T_JMAX and 60°C/W R_θJA support reliable operation without derating at full load in confined chassis.

AC/DC Adapters

Offline SMPS Input Stage

Use Scenario: Wall-mounted 5–12 V, 1–2 A power adapters for consumer electronics.

IC Role / Device Role / Timing Role: Single-phase rectifier converting 90–264 VAC to pulsating DC prior to bulk capacitor filtering.

Use Value: 400 V V_RRM provides 2× safety margin over 264 VAC peak (373 V), while 1.3 V V_F limits self-heating in sealed enclosures.

Use Scenario: Primary-side input rectification in 10–25 W flyback converters for LED drivers and IoT gateways.

IC Role / Device Role / Timing Role: Fast recovery diode in voltage-doubler or bridge configuration feeding the primary winding.

Use Value: 500 ns t_rr reduces switching node ringing and EMI generation compared to general-purpose rectifiers.

DC-DC Converter Front-End

Industrial Control Power Supply

Use Scenario: 24 V input DC-DC modules accepting wide-range 18–36 VDC with transient protection.

IC Role / Device Role / Timing Role: Polarity protection and input surge clamping diode on the DC input rail.

Use Value: 30 A I_FSM handles 100 ms load dump transients; DO-41 form factor allows direct through-hole mounting on control board edges.

Use Scenario: Auxiliary 5 V/3.3 V bias supply in PLC I/O modules operating at 55°C ambient.

IC Role / Device Role / Timing Role: Secondary-side output rectifier in isolated flyback supplying logic rails.

Use Value: 150°C T_JMAX and 60°C/W R_θJA support reliable operation without derating at full load in confined chassis.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R04	Same 1 A / 400 V rating; 350 ns t_rr; TO-220AC package (larger footprint, higher thermal mass)	Preferred in higher-power (>15 W), heatsinked designs requiring lower trr and better thermal dissipation	Select STTH1R04 when board space allows TO-220 and sub-400 ns recovery is needed for >150 kHz operation
ON Semi MUR1040	1 A / 400 V; 50 ns t_rr; DO-41 package; higher cost; tighter V_F distribution (1.15 V typ)	Better suited for ultra-low-noise, high-frequency PFC pre-regulators where minimal reverse recovery charge is critical	Choose MUR1040 only if system-level EMI testing shows trr-induced noise exceeds limits with BA157G-K

Compared with STTH1R04 and MUR1040, the BA157G-K offers optimal balance of DO-41 footprint, 500 ns recovery, and cost for <15 W adapters - trading 150 ns trr for 40% lower unit price and legacy board compatibility.

Availability

BA157G-K is available at Aetrix Electronics and suitable for AC/DC adapters, offline SMPS input stages, and industrial control power supplies requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BA157G-K 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 global power and signal conditioning markets since 1979.

The BA157G-K belongs to TSC's BA15xG-K fast recovery rectifier family, engineered specifically for cost-sensitive, high-volume AC/DC front-end applications demanding reliability, RoHS compliance, and DO-41 compatibility.

FAQ

What is the maximum junction temperature rating for BA157G-K?

The BA157G-K has a maximum junction temperature (T_J) rating of +150°C, verified per absolute maximum ratings table. This allows continuous operation at full 1 A load in ambient temperatures up to 75°C without external heatsinking, assuming standard PCB copper area and natural convection. The BA157G-K maintains stable electrical parameters across this range when operated within its derated forward current curve.

Does BA157G-K meet RoHS and halogen-free requirements?

Yes, the BA157G-K is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound is UL 94V-0 rated, and terminals are pure tin-plated to meet J-STD-002 solderability standards. These specifications are confirmed in the official Taiwan Semiconductor datasheet revision B2104 and verified on Digi-Key and Mouser product pages.

What is the reverse recovery time (t_rr) test condition for BA157G-K?

The BA157G-K reverse recovery time is measured at I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A, per the Electrical Specifications table. This standardized condition ensures consistent comparison with other fast recovery diodes. The typical value is not specified, but the maximum is 500 ns - a key parameter for minimizing switching loss in 50–100 kHz flyback converters using the BA157G-K.

Can BA157G-K be used as a direct replacement for 1N4007 in SMPS designs?

No, the BA157G-K is not a direct replacement for 1N4007 in SMPS designs. While both are DO-41 rectifiers, the 1N4007 is a general-purpose diode with ~2 µs t_rr, causing excessive switching loss and EMI in high-frequency converters. The BA157G-K's 500 ns t_rr makes it suitable for SMPS, but its 400 V V_RRM is lower than 1N4007's 1000 V - requiring circuit review for voltage margin before substitution.

What packaging options are available for BA157G-K?

The BA157G-K is supplied in two standard packaging formats: 5,000 units per tape-and-reel (ordering code BA157G-K) and 3,000 units per ammo box (ordering code BA157G-K A0G). Both use DO-204AL (DO-41) packaging with green compound and standard marking "BA157G". No tray or tube options are listed in the official Taiwan Semiconductor documentation.

BA157G-K Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-204AL, DO-41, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 400 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 1.3 V @ 1 A

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

Reverse Recovery Time (trr):: 500 ns

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

Capacitance @ Vr, F:: 15pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AL (DO-41)

Operating Temperature - Junction:: 150°C

BA157G-K FAQ

1.How can I place an order for BA157G-K through Aetrix?

Please submit a Request for Quotation (RFQ) for BA157G-K 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 BA157G-K reliable?

The price and inventory of BA157G-K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BA157G-K is usually 5 days.

3.What payment methods are accepted for BA157G-K?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BA157G-K transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BA157G-K?

BA157G-K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BA157G-K 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 BA157G-K?

For technical support, including BA157G-K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BA157G-K requirements.

6.How does Aetrix verify that BA157G-K is sourced from the original manufacturer or authorized distributors?

All BA157G-K 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 BA157G-K meets industry standards.

7.What is the process for return or replacement of BA157G-K?

All BA157G-K units undergo pre-shipment inspection (PSI). If there is an issue with BA157G-K, 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 BA157G-K part is unused and in its original packaging.

Return procedure for BA157G-K:

1.Submit a request within 90 days.

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

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