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Taiwan Semiconductor Corporation BA157G
- Part No.:
- BA157G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BA157G.pdf
- Description:
- DIODE GEN PURP 400V 1A DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,990
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Product details
Overview
BA157G from Taiwan Semiconductor is a 1A, 400V fast recovery rectifier diode in DO-204AL (DO-41) package, featuring 150 ns reverse recovery time, 1.2 V max forward voltage at 1 A, and 30 A surge capability. It serves as a primary AC/DC input rectifier in compact switching power supplies.
For engineers reviewing the BA157G datasheet, BA157G pinout, BA157G application, or BA157G equivalent, key selection criteria include its 400 V repetitive peak reverse voltage, 150 ns trr performance, thermal resistance of 60 °C/W, AEC-Q101 qualification option, and compatibility with automated tape-and-reel assembly.
Technical Context
The BA157G employs a single-die, glass-passivated PN junction optimized for fast recovery in high-frequency switching topologies. Its 150 ns reverse recovery time enables efficient operation in 50–500 kHz SMPS designs while maintaining low conduction loss.
Thermally, it supports continuous 1 A forward current up to 150 °C junction temperature, with 60 °C/W junction-to-ambient resistance under standard PCB mounting. Reverse leakage remains ≤5 µA at 25 °C and ≤100 µA at 125 °C under rated 400 V reverse bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IF (Continuous Forward Current) | 1 A - Supports sustained output in 5–15 W offline adapters without forced cooling |
| VRRM (Repetitive Peak Reverse Voltage) | 400 V - Rated for universal-input (85–265 VAC) bridge rectification with 2× safety margin |
| trr (Reverse Recovery Time) | 150 ns - Enables stable operation in 200–500 kHz flyback and forward converters |
| VF (Forward Voltage @ 1 A) | ≤1.2 V - Limits conduction loss to ≤1.2 W per diode at full load, improving efficiency |
| IFSM (Surge Current) | 30 A - Withstands cold-start inrush in DC-DC inputs and line-connected inverters |
| RθJA (Thermal Resistance) | 60 °C/W - Requires ≥1 cm² copper pour for reliable 1 A operation at 50 °C ambient |
| IR (Reverse Leakage @ 25°C) | ≤5 µA - Ensures minimal standby power loss in energy-sensitive applications |
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 (Lead 1) | Positive input terminal during forward conduction | Connected to AC input phase or transformer secondary center-tap in full-wave configurations |
| Cathode (Lead 2, banded end) | Output terminal during forward conduction; blocking node during reverse bias | Routes rectified DC to bulk capacitor; must withstand full VRRM during off-state |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enhances moisture resistance and long-term reliability in humid industrial environments |
| AEC-Q101 qualified variant available (BA157GH) | Validated for automotive under-hood temperature cycling, vibration, and ESD stress |
| Low VF + fast trr co-optimization | Reduces combined switching and conduction losses better than standard recovery diodes |
| Pure tin-plated leads | Ensures solderability per J-STD-002 and eliminates whisker risk per JESD201 Class 2 |
Applications
| AC/DC Adapter Input Rectification | DC-DC Converter Output Rectification |
|---|---|
Use Scenario: 12 V/1 A wall adapter converting 85–265 VAC to regulated DC using flyback topology. IC Role / Device Role / Timing Role: Primary-side unidirectional current switch enabling energy transfer during MOSFET off-time. Use Value: 150 ns trr minimizes switching loss at 250 kHz; 1.2 V VF limits heat rise on minimal PCB copper. | Use Scenario: Isolated 5 V/2 A buck-derived converter in industrial PLC I/O module. IC Role / Device Role / Timing Role: Secondary-side synchronous rectifier replacement where cost-sensitive design favors discrete diode. Use Value: 400 V VRRM provides margin against reflected transients; 30 A IFSM handles startup surges. |
| Switching Inverter DC Link Protection | General-Purpose Industrial Power Supply |
Use Scenario: 24 V DC-fed H-bridge inverter driving 100 W BLDC motor with regenerative braking. IC Role / Device Role / Timing Role: Freewheeling path for inductive kickback during PWM dead-time intervals. Use Value: Fast 150 ns recovery prevents shoot-through risk; 15 pF CJ reduces EMI coupling into gate drivers. | Use Scenario: 24 V/0.5 A auxiliary supply powering microcontroller and sensors in HVAC control board. IC Role / Device Role / Timing Role: Input-stage rectifier feeding linear regulator or buck controller. Use Value: 1 A IF rating accommodates 2× load transients; DO-41 package fits legacy through-hole layouts. |
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; trr = 100 ns (faster), VF = 1.3 V (higher), DO-41 package | Better suited for >300 kHz designs where switching loss dominates conduction loss | Select STTH1R04 when optimizing for ultra-fast switching; verify layout thermal relief for higher VF |
| ON Semi MUR140 | 1 A / 400 V; trr = 50 ns (much faster), VF = 1.25 V, same DO-41 package, AEC-Q101 not offered | Preferred in noise-sensitive medical or audio power stages requiring minimal reverse recovery ringing | Choose MUR140 for lowest EMI; avoid if AEC-Q101 compliance is mandatory |
Compared with STTH1R04 and MUR140, the BA157G delivers balanced trr/VF trade-off and AEC-Q101 availability in GH variant-making it optimal for cost-constrained automotive body electronics and industrial SMPS where 150 ns recovery suffices.
Availability
BA157G is available at Aetrix Electronics and suitable for AC/DC adapters, DC-DC converters, and industrial power supplies requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for BA157G 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 industrial, computing, and automotive markets since 1979.
The BA157G belongs to TSC's BA15xG fast recovery rectifier family, engineered specifically for high-efficiency, high-reliability AC/DC and DC/DC conversion in space-constrained and thermally demanding applications.
FAQ
What is the maximum junction temperature rating for the BA157G?
The BA157G has a maximum junction temperature (TJ MAX) of +150 °C, allowing continuous operation in high-ambient environments such as enclosed power supplies or automotive engine compartments when properly heatsinked. Derating begins above 25 °C ambient per the forward current derating curve in the datasheet. The BA157G maintains specified electrical performance up to this limit under rated conditions.
Is the BA157G pin-compatible with other diodes in the BA15xG series?
Yes-the BA157G shares identical DO-204AL (DO-41) package dimensions, lead spacing, and axial pinout with BA158G and BA159G. All variants use the same anode/cathode terminal assignment and mechanical footprint, enabling direct substitution in layouts designed for the BA15xG family when voltage rating requirements align.
Does the BA157G meet automotive qualification standards?
The standard BA157G is not AEC-Q101 qualified, but the BA157GH variant-identical in all electrical and thermal specs-is explicitly qualified per AEC-Q101. This makes BA157GH suitable for automotive body control modules, lighting drivers, and infotainment power supplies where stress testing and lifetime reliability are mandated.
What is the reverse recovery time (trr) specification for the BA157G, and how is it measured?
The BA157G has a maximum reverse recovery time (trr) of 150 ns, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A per JEDEC test conditions. This value reflects real-world switching behavior in high-frequency converters and is confirmed via standardized oscilloscope-based double-pulse testing outlined in the BA157G datasheet Figure 6.
Can the BA157G be used in surface-mount designs?
No-the BA157G is exclusively offered in through-hole DO-204AL (DO-41) packaging with axial leads. It is not available in SMD variants such as SMA or SOD-123. For surface-mount alternatives with similar ratings, consider the BA157WS (SMA) or equivalent fast recovery diodes from TSC's surface-mount portfolio.
BA157G 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:
- 1.2 V @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 150 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:
- -55°C ~ 150°C
BA157G FAQ
1.How can I place an order for BA157G through Aetrix?
Please submit a Request for Quotation (RFQ) for BA157G 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 reliable?
The price and inventory of BA157G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BA157G is usually 5 days.
3.What payment methods are accepted for BA157G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BA157G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BA157G?
BA157G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BA157G 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?
For technical support, including BA157G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BA157G requirements.
6.How does Aetrix verify that BA157G is sourced from the original manufacturer or authorized distributors?
All BA157G 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 meets industry standards.
7.What is the process for return or replacement of BA157G?
All BA157G units undergo pre-shipment inspection (PSI). If there is an issue with BA157G, 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 part is unused and in its original packaging.
Return procedure for BA157G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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