My Inquiry
My Account
Infineon Technologies BAW78C
- Part No.:
- BAW78C
- Manufacturer:
- Infineon Technologies
- Category:
- Single Diodes
- Package:
- TO-243AA
- Datasheet:
-
BAW78C.pdf
- Description:
- DIODE GEN PURP 200V 1A SOT89-4-2
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BAW78C from Nexperia is a silicon switching diode in SOT89 package, rated for 200 V reverse voltage (VR), 1 A continuous forward current (IF), and 10 A surge current (IFS), with 1 µA reverse leakage at VR = 200 V and 25 °C. It delivers fast 1 µs reverse recovery time (trr) and low 10 pF junction capacitance (CD), making it suitable for high-voltage DC-DC converter flyback snubbers and industrial relay drive circuits.
For engineers reviewing the BAW78C datasheet, BAW78C pinout, BAW78C application, or BAW78C equivalent, key selection criteria include verified 200 V breakdown margin, thermal resistance RthJS = 25 K/W, SOT89 power dissipation capability up to 1 W at TS = 125 °C, and confirmed n.c. terminal configuration for PCB layout isolation.
Technical Context
The BAW78C operates as a single-junction, planar epitaxial silicon switching diode optimized for high-voltage transient suppression and fast turn-off in inductive load switching. Its 200 V VR rating targets applications where voltage spikes exceed standard 100 V diodes but do not require 400 V devices like the BAW78D.
Thermal design relies on soldering-point referenced junction-to-case thermal resistance (RthJS = 25 K/W), enabling reliable operation up to 150 °C junction temperature when mounted on adequate copper area. The n.c. (no-connect) Pin 3 eliminates routing complexity while maintaining mechanical stability in SOT89.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Voltage (VR) | 200 V - supports sustained blocking in 12–48 V systems with ≥2× safety margin against transients |
| Forward Current (IF) | 1 A - enables continuous conduction in medium-power relay drivers and clamp circuits |
| Surge Current (IFS) | 10 A (t = 1 s) - handles inrush and inductive kick without failure |
| Reverse Recovery Time (trr) | 1 µs - minimizes switching losses in 100–500 kHz SMPS snubber networks |
| Junction Capacitance (CD) | 10 pF @ 0 V, 1 MHz - reduces high-frequency noise coupling in EMI-sensitive timing paths |
| Thermal Resistance (RthJS) | 25 K/W - allows 1 W power dissipation with ≤25 K rise from solder point to junction |
Pinout & Package
SOT89 package: 3-pin surface-mount plastic case with exposed emitter pad (Pin 2) for thermal conduction; Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = no-connect (n.c.) - electrically isolated and unused.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Main current entry point; connected to switched high-side node in clamp/flyback configurations |
| Pin 2 | Cathode | Main current exit and thermal path; soldered to large copper pour for heat dissipation |
| Pin 3 | n.c. | Electrically isolated; provides mechanical anchoring without circuit connection |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Blocking | 200 V VR rating ensures robustness against 150 V system transients with 33% margin |
| Fast Switching | 1 µs trr enables efficient operation in 200–400 kHz DC-DC converters without excessive loss |
| Low Leakage | 1 µA IR at 200 V/25 °C maintains standby power integrity in always-on control logic |
| Thermally Optimized | RthJS = 25 K/W supports 1 W dissipation with minimal board-level heatsinking |
Applications
| Industrial Relay Drivers | DC-DC Converter Snubbers |
|---|---|
Use Scenario: Driving 24 V/48 V industrial relays with inductive coil energy >100 mJ. IC Role / Device Role / Timing Role: Freewheeling diode clamping back-EMF during coil de-energization. Use Value: 200 V VR withstands 150 V+ flyback spikes; 10 A IFS absorbs full coil discharge without degradation. | Use Scenario: Snubbing MOSFET drain nodes in 300 kHz flyback converters with 36 V input. IC Role / Device Role / Timing Role: Transient voltage suppressor limiting peak drain voltage during switching transitions. Use Value: 1 µs trr prevents tail current overlap; 10 pF CD avoids resonance with transformer leakage inductance. |
| Automotive Body Control Modules | PLC Input Protection Circuits |
Use Scenario: Protecting microcontroller GPIOs from 12 V battery line transients in BCM door lock actuators. IC Role / Device Role / Timing Role: Reverse-polarity and load-dump clamp diode on switched 12 V supply rail. Use Value: 200 V VR exceeds ISO 7637-2 Pulse 5a (120 V) requirement; 150 °C Tj rating supports under-hood placement. | Use Scenario: Isolating 24 V digital inputs from field wiring surges in industrial PLC I/O modules. IC Role / Device Role / Timing Role: High-voltage transient shunt protecting optocoupler input stages. Use Value: 1 µA IR at 24 V ensures <25 nW standby leakage; SOT89 footprint fits dense I/O header layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH1L06 | 600 V VR, 1 A IF, TO-220AB package, 50 ns trr | Higher voltage headroom but larger footprint and slower soft-recovery behavior | Prefer for >300 V systems requiring higher surge immunity; avoid if SOT89 space or fast trr is critical |
| MMBD7000LT1G | 100 V VR, 200 mA IF, SOT-23 package, 4 ns trr | Lower voltage rating and current capacity; ultra-fast but thermally limited | Only suitable for signal-level clamping below 50 V; insufficient for 24/48 V power rail protection |
Compared with STTH1L06 and MMBD7000LT1G, the BAW78C uniquely balances 200 V blocking, 1 A current handling, SOT89 thermal performance, and 1 µs trr-making it optimal for space-constrained, medium-voltage industrial switching where both voltage margin and thermal efficiency matter.
Availability
BAW78C is available at Aetrix Electronics and suitable for industrial relay drivers, DC-DC converter snubbers, and PLC input protection circuits requiring stable component supply across extended production lifecycles.
Supply support for BAW78C 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic components, headquartered in Nijmegen, Netherlands.
The BAW78 series belongs to Nexperia's high-voltage switching diode product line, engineered specifically for robust transient suppression and fast turn-off in industrial power control and automotive body electronics.
FAQ
What is the maximum junction temperature for continuous operation of the BAW78C?
The BAW78C has a specified maximum junction temperature (Tj) of 150 °C. This rating applies under conditions where total power dissipation does not exceed 1 W at a solder-point temperature (TS) of 125 °C, with thermal resistance RthJS = 25 K/W. Operation above this limit risks parametric shift and long-term reliability degradation.
Is Pin 3 of the BAW78C internally connected or should it be left floating on the PCB?
Pin 3 is explicitly marked "n.c." (no-connect) in the official Nexperia datasheet and type marking table. It is electrically isolated from the die and serves only as a mechanical anchor. PCB layout must leave Pin 3 unconnected-neither tied to ground nor routed-to prevent unintended parasitic coupling or thermal stress.
How does the BAW78C's reverse recovery time compare to Schottky alternatives in the same package?
The BAW78C has a trr of 1 µs, typical for silicon PN junction switching diodes. Schottky diodes like the PDS340H-13 lack reverse recovery entirely (trr ≈ 0), but cannot achieve 200 V VR. No Schottky in SOT89 offers >100 V VR-making the BAW78C the only viable SOT89 option for 200 V fast-switching applications.
Can the BAW78C replace the BAW78B in an existing 100 V design without derating?
No. While the BAW78C shares identical package, pinout, and thermal specs with the BAW78B, its higher 200 V VR reflects different doping and junction design. Using it in a 100 V design introduces unnecessary cost and potential VF increase (typical VF at 1 A is ~1.6 V vs. ~1.2 V for BAW78B), with no functional benefit unless future voltage margin expansion is planned.
BAW78C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Bulk
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 200 V
- Current - Average Rectified (Io):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 1.6 V @ 1 A
- Speed:
- Standard Recovery >500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 1 µs
- Current - Reverse Leakage @ Vr:
- 1 µA @ 200 V
- Capacitance @ Vr, F:
- 10pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-SOT89-4-2
- Operating Temperature - Junction:
- 150°C
BAW78C FAQ
1.How can I place an order for BAW78C through Aetrix?
Please submit a Request for Quotation (RFQ) for BAW78C 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 BAW78C reliable?
The price and inventory of BAW78C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAW78C is usually 5 days.
3.What payment methods are accepted for BAW78C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAW78C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAW78C?
BAW78C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAW78C 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 BAW78C?
For technical support, including BAW78C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAW78C requirements.
6.How does Aetrix verify that BAW78C is sourced from the original manufacturer or authorized distributors?
All BAW78C 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 BAW78C meets industry standards.
7.What is the process for return or replacement of BAW78C?
All BAW78C units undergo pre-shipment inspection (PSI). If there is an issue with BAW78C, 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 BAW78C part is unused and in its original packaging.
Return procedure for BAW78C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAW78C Tags
-
1N4448X-TP
Micro Commercial Co
-
1N4148WX-TP
Micro Commercial Co
-
1N4148TR
onsemi
-
MMSD4148T1G
onsemi
-
MMBD914LT3G
onsemi
-
BAS16HT1G
onsemi
-
1N914BWT
onsemi
-
BAS21LT1G
onsemi
-
LL4148
onsemi
-
BAS16LT1G
onsemi
-
MMSD914T1G
onsemi
-
BAV21W-7-F
Diodes Incorporated
Tech Hub
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…
Engineering guide to output capacitor selection for ASIC Vcore rails, covering bulk capacitors, polymer capacitors, MLCC decoupling, DC bias, ESR, ESL, placement, transient response and substitution ri…
Engineering guide to high-current ASIC Vcore rails, covering 12-phase buck architecture, PMBus control, dynamic load testing, output capacitor networks, smart power stage selection, thermal design and …
Voltage regulator guide covering linear, LDO, 7805, Zener, adjustable, buck, VRM and alternator regulators, with design checks, testing methods, troubleshooting and datasheet-based selection.
Amplifier guide covering voltage, current and power amplification, gain, feedback, amplifier classes, audio and RF applications, op-amp circuits, transimpedance amplifiers, datasheet selection and trou…
