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Taiwan Semiconductor Corporation SMA4S39AH
- Part No.:
- SMA4S39AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-128
- Datasheet:
-
SMA4S39AH.pdf
- Description:
- TVS DIODE 39VWM 63.3VC SOD128
- Quantity:
- Payment:
- Shipping:
Inventory:6,188
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Product details
Overview
SMA4S39AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 39V working stand-off voltage, 43.6–48.2V breakdown range at 1mA, and 63.3V clamping voltage at 6.3A peak pulse current; used for overvoltage protection in automotive BLDC motor drives and battery management systems.
For engineers reviewing the SMA4S39AH datasheet, SMA4S39AH pinout, SMA4S39AH application, or SMA4S39AH equivalent, key selection criteria include its SOD-128 package thermal performance (RθJL = 20°C/W), AEC-Q101 qualification, 175°C max junction temperature, and unidirectional polarity with 1µA leakage at VWM.
Technical Context
The SMA4S39AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified breakdown range (43.6–48.2V), clamping transients to ≤63.3V at 6.3A (10/1000µs waveform). It features glass-passivated junction construction and meets JESD201 Class 2 whisker resistance.
Designed for high-reliability automotive environments, it supports continuous operation from –55°C to +175°C, with thermal derating above 25°C ambient per Fig. 1, and achieves 400W non-repetitive peak pulse power dissipation on a 5mm × 5mm copper pad PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 39 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1mA | 43.6–48.2 V - Verified breakdown threshold ensuring reliable turn-on during overvoltage events |
| VC @ IPPM=6.3A | 63.3 V - Clamped voltage limiting downstream circuit stress under standardized 10/1000µs surge |
| PPPM | 400 W - Peak pulse power handling capacity for transient suppression without failure |
| RθJL | 20 °C/W - Junction-to-lead thermal resistance enabling efficient heat transfer to PCB copper |
| TJ max | +175 °C - Maximum allowable junction temperature supporting under-hood automotive deployment |
| IR @ VWM | 1 µA - Low leakage current preserving system efficiency in standby and low-power states |
Pinout & Package
Package: SOD-128 - Surface-mount, flat-lead plastic package with cathode band marking; 5.3mm × 3.4mm footprint, 2.5mm height; UL 94V-0 rated molding compound; matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Reverse-biased blocking terminal | Connected to protected line (e.g., 39V rail); conducts only during overvoltage transients |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Glass-passivated junction | Enhanced moisture resistance and long-term stability of breakdown characteristics |
| VBR tempco ≤ 0.095%/°C | Predictable voltage shift across operating temperature range minimizes design margin uncertainty |
| Moisture sensitivity level 1 | No floor-life limitation or bake requirement prior to reflow assembly |
| Halogen-free (IEC 61249-2-21) | Complies with environmental regulations for end-of-life recycling and combustion safety |
Applications
| Automotive BLDC Motor Control | Battery Management System (BMS) |
|---|---|
Use Scenario: Protection of gate drivers and MCU inputs against inductive kickback from 12–48V BLDC motor phases. IC Role / Device Role / Timing Role: Unidirectional TVS placed across motor phase traces to clamp switching transients before they reach sensitive logic. Use Value: Limits clamped voltage to 63.3V, preventing damage to 65V-rated MOSFETs and 5V/3.3V microcontrollers in compact motor modules. | Use Scenario: Safeguarding cell monitoring ICs and communication lines in 12–48V lithium-ion battery packs. IC Role / Device Role / Timing Role: Standoff protection on voltage sense rails and CAN/LIN bus lines against load dump and jump-start surges. Use Value: Withstands 400W pulses while maintaining <1µA leakage, avoiding false fault detection or measurement drift in precision analog front-ends. |
| LED Driver Power Supply | Industrial SMPS Output Stage |
Use Scenario: Overvoltage suppression on constant-current LED string outputs subjected to hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing fast-rising transients (<10ns) induced by connector mating/unmating. Use Value: 63.3V clamping ensures compatibility with 60V-rated LED drivers and avoids unnecessary overdesign of output capacitors. | Use Scenario: Secondary-side transient protection in 36–48V output DC/DC converters for factory automation controllers. IC Role / Device Role / Timing Role: Final-stage clamp on regulated output rail to prevent latch-up or burnout of downstream regulators and sensors. Use Value: RθJL = 20°C/W enables sustained operation at full 400W rating with minimal board area, reducing need for heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ39A | Lower PPPM (400W same), but higher VC = 67.8V at 5.9A; RθJA = 85°C/W vs. 62°C/W | Less effective clamping margin for 65V-rated components; reduced thermal headroom on dense PCBs | Acceptable where layout allows larger copper area or where 67.8V clamping is within system tolerance |
| SMCJ39A | Same VWM/VBR range, but higher PPPM (1500W); larger SMC (DO-214AB) package (7.11 × 6.22 mm) | Overqualified for 400W needs; requires PCB redesign due to 2× footprint and different thermal path | Only suitable if future-proofing for higher surge levels or if existing SMC footprint is standardized |
Compared with SMAJ39A and SMCJ39A, the SMA4S39AH delivers tighter clamping (63.3V), superior thermal performance (RθJL = 20°C/W), and AEC-Q101 qualification in the compact SOD-128 package-making it optimal for space-constrained, thermally demanding automotive and industrial applications.
Availability
SMA4S39AH is available at Aetrix Electronics and suitable for automotive BLDC motor control, battery management systems, and industrial SMPS requiring stable component supply with AEC-Q101 compliance and high thermal efficiency.
Supply support for SMA4S39AH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive and industrial markets.
The SMA4SxxAH series is part of TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for high-energy transient suppression in harsh-environment automotive subsystems such as motor drives and battery interfaces.
FAQ
What is the maximum clamping voltage of the SMA4S39AH under standard test conditions?
The SMA4S39AH has a maximum clamping voltage (VC) of 63.3 V when subjected to a 10/1000 µs waveform peak pulse current of 6.3 A. This value is measured at TA = 25°C and reflects the device's ability to limit transient voltage across protected circuits, ensuring compatibility with 65V-rated downstream components in the SMA4S39AH application environment.
Is the SMA4S39AH suitable for automotive applications?
Yes, the SMA4S39AH is AEC-Q101 qualified and designed for automotive use, including BLDC motor control and battery management systems. Its –55°C to +175°C operating temperature range, glass-passivated junction, and JESD201 Class 2 whisker resistance meet stringent automotive reliability requirements-making the SMA4S39AH appropriate for under-hood and chassis-mounted electronics.
What is the thermal resistance from junction to lead (RθJL) for the SMA4S39AH?
The SMA4S39AH has a typical junction-to-lead thermal resistance (RθJL) of 20°C/W when mounted on a 5 mm × 5 mm copper pad PCB. This low thermal resistance enables efficient heat transfer from the die to the PCB, supporting sustained 400W pulse handling and making the SMA4S39AH well-suited for thermally constrained layouts in automotive and industrial designs.
Does the SMA4S39AH have unidirectional or bidirectional polarity?
The SMA4S39AH is a unidirectional TVS diode, indicated by its single cathode band marking and specified forward voltage (VF = 3.5 V @ 25 A). It blocks voltage up to 39 V in reverse bias and conducts only during overvoltage transients-making the SMA4S39AH ideal for DC rail protection where polarity is fixed and reverse conduction is not required.
What packaging and reel quantity is available for the SMA4S39AH?
The SMA4S39AH is supplied in the SOD-128 package on tape-and-reel format, with 14,000 units per reel. This packaging supports automated SMT placement and is compatible with standard pick-and-place equipment-ensuring efficient manufacturing integration for the SMA4S39AH in high-volume automotive and industrial production.
SMA4S39AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- SOD-128
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 39V
- Voltage - Breakdown (Min):
- 43.6V
- Voltage - Clamping (Max) @ Ipp:
- 63.3V
- Current - Peak Pulse (10/1000µs):
- 6.3A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-128
SMA4S39AH FAQ
1.How can I place an order for SMA4S39AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4S39AH 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 SMA4S39AH reliable?
The price and inventory of SMA4S39AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4S39AH is usually 5 days.
3.What payment methods are accepted for SMA4S39AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4S39AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4S39AH?
SMA4S39AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4S39AH 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 SMA4S39AH?
For technical support, including SMA4S39AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4S39AH requirements.
6.How does Aetrix verify that SMA4S39AH is sourced from the original manufacturer or authorized distributors?
All SMA4S39AH 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 SMA4S39AH meets industry standards.
7.What is the process for return or replacement of SMA4S39AH?
All SMA4S39AH units undergo pre-shipment inspection (PSI). If there is an issue with SMA4S39AH, 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 SMA4S39AH part is unused and in its original packaging.
Return procedure for SMA4S39AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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