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Taiwan Semiconductor Corporation SMA4S15AH
- Part No.:
- SMA4S15AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-128
- Datasheet:
-
SMA4S15AH.pdf
- Description:
- TVS DIODE 15VWM 24.4VC SOD128
- Quantity:
- Payment:
- Shipping:
Inventory:6,964
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Product details
Overview
SMA4S15AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 15V working stand-off voltage, 16.8–18.5V breakdown voltage at 1mA, and 24.4V clamping voltage at 16.4A peak pulse current; used for overvoltage protection in automotive BLDC motor drives and battery management systems.
For engineers reviewing the SMA4S15AH datasheet, SMA4S15AH pinout, SMA4S15AH application, or SMA4S15AH equivalent, key selection criteria include unidirectional polarity, SOD-128 package thermal performance (RθJL = 20°C/W), 175°C max junction temperature, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This TVS diode operates as a unidirectional clamping device, activated when reverse voltage exceeds VBR (16.8–18.5V), limiting transients to ≤24.4V at 16.4A (10/1000μs waveform). Its glass-passivated junction ensures stable leakage (<1μA at 15V) and low temperature coefficient (0.095%/°C).
Designed for high-reliability automotive environments, it meets AEC-Q101 stress testing, JESD201 Class 2 whisker resistance, and UL 94V-0 flammability rating. Thermal performance is characterized on a 5mm × 5mm copper pad PCB, with RθJA = 62°C/W and RθJC = 16°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT=1mA | 16.8–18.5 V - Verified breakdown threshold ensuring precise overvoltage triggering |
| VC @ IPPM=16.4A | 24.4 V - Clamped voltage during 10/1000μs surge, defining protected circuit's maximum stress level |
| PPPM | 400 W - Peak pulse power handling capability under standardized transient conditions |
| TJ max | 175 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| RθJL | 20 °C/W - Junction-to-lead thermal resistance supporting reliable heat transfer to PCB copper |
| IR @ VWM | <1 μA - Low reverse leakage preserves efficiency in standby and low-power modes |
Pinout & Package
Package: SOD-128 - Surface-mount, unidirectional TVS diode with cathode band marking; 5.3mm × 3.4mm footprint, 2.5mm height, 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 clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 15V rail); conducts only during overvoltage events above VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, BLDC drives, and BMS under temperature cycling, HTRB, and ESD stress |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage across 175°C operation and humidity exposure |
| VBR tempco: 0.095%/°C | Minimizes drift in trigger voltage over temperature-critical for consistent clamping in wide ambient ranges |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking, reducing manufacturing complexity and cost |
| UL 94V-0 molding compound | Provides flame-retardant encapsulation required for automotive and industrial safety compliance |
Applications
| Automotive Power Distribution | BLDC Motor Drive Protection |
|---|---|
Use Scenario: Protecting 12V/15V supply rails in body control modules and lighting ECUs against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between power rail and ground to clamp transients to ≤24.4V. Use Value: Prevents damage to downstream regulators and microcontrollers during 100V/100ms load dump events. | Use Scenario: Safeguarding gate drivers and Hall sensors in 3-phase BLDC inverters from switching-induced voltage spikes. IC Role / Device Role / Timing Role: Parallel-connected TVS on low-side FET source or phase node to absorb commutation energy. Use Value: Limits dv/dt-induced false triggering and maintains signal integrity during high-frequency PWM operation. |
| Battery Management Systems | LED Driver Circuits |
Use Scenario: Overvoltage suppression on cell monitor IC inputs and charge path FET gates in 12–48V Li-ion packs. IC Role / Device Role / Timing Role: Clamp device on analog sensing lines and MOSFET gate resistors to prevent latch-up during hot-plug or fault recovery. Use Value: Maintains ±1% voltage measurement accuracy by holding leakage below 1μA at 15V operating bias. | Use Scenario: Transient protection on constant-current LED driver outputs exposed to cable disconnect surges and ESD. IC Role / Device Role / Timing Role: Unidirectional TVS placed across LED string output to shunt inductive kickback from driver IC shutdown. Use Value: Enables robust 400W surge handling without derating, preserving luminous output consistency over lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A | Lower PPPM (400W same), but higher VC (24.4V vs. 27.7V), lower IPPM (14.3A), and no AEC-Q101 qualification | Not qualified for automotive under-hood use; suitable for industrial SMPS only | Select SMA4S15AH when AEC-Q101 compliance and tighter VC tolerance are required |
| SMB4S15AH | Same electrical specs and AEC-Q101 rating, but SMB (DO-214AA) package-larger footprint (4.6×3.6mm vs. 5.3×3.4mm) and higher RθJA (70°C/W) | Less effective thermal dissipation in space-constrained layouts; requires larger copper area | Choose SMA4S15AH for higher power density and improved thermal performance in compact automotive PCBs |
Compared with SMAJ15A and SMB4S15AH, the SMA4S15AH delivers superior thermal resistance (RθJL = 20°C/W), tighter clamping (24.4V), and full AEC-Q101 validation-making it optimal for high-density, high-reliability automotive power nodes where board space and thermal margin are constrained.
Availability
SMA4S15AH is available at Aetrix Electronics and suitable for automotive power distribution, BLDC motor drive protection, and battery management systems requiring stable component supply with AEC-Q101 assurance and 400W transient immunity.
Supply support for SMA4S15AH 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 TVS diodes, rectifiers, MOSFETs, and automotive-qualified components.
The SMA4SxxAH series was developed specifically for AEC-Q101-compliant automotive transient suppression, targeting high-power-density placement on 12–60V rails in engine control units, electric power steering, and battery monitoring systems.
FAQ
What is the clamping voltage of the SMA4S15AH under a 10/1000μs surge?
The SMA4S15AH has a maximum clamping voltage (VC) of 24.4 V when subjected to a 16.4 A peak pulse current with a 10/1000μs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuits during transient events. The SMA4S15AH maintains this clamping performance across its specified junction temperature range of –55°C to +175°C.
Is the SMA4S15AH suitable for automotive applications?
Yes, the SMA4S15AH is AEC-Q101 qualified and designed for automotive use, including under-hood environments. It passes stress tests for temperature cycling, high-temperature reverse bias, and mechanical shock. Its 175°C maximum junction temperature, glass-passivated junction, and UL 94V-0 molding compound meet stringent automotive reliability requirements-making SMA4S15AH appropriate for engine control, BLDC drives, and battery management systems.
What is the polarity configuration of the SMA4S15AH?
The SMA4S15AH is a unidirectional TVS diode, meaning it functions as a reverse-biased clamp-conducting only when the cathode voltage exceeds the anode by more than the breakdown voltage (16.8–18.5 V). Its cathode band marking aligns with industry-standard SOD-128 polarity identification. This configuration makes SMA4S15AH ideal for DC rail protection where forward conduction must be blocked.
How does the thermal performance of the SMA4S15AH compare to similar SOD-128 TVS diodes?
The SMA4S15AH achieves RθJL = 20°C/W and RθJA = 62°C/W when mounted on a 5mm × 5mm copper pad, outperforming many competing SOD-128 TVS devices. This low thermal resistance enables higher sustained power handling and improved reliability in thermally constrained automotive PCB layouts. The SMA4S15AH's thermal design directly supports its 400W peak pulse rating without derating at elevated ambient temperatures.
What packaging and reel quantity is available for the SMA4S15AH?
The SMA4S15AH is supplied in SOD-128 package format on tape-and-reel, with 14,000 units per reel. This packaging supports high-volume automated SMT assembly and complies with J-STD-020 moisture sensitivity level 1-eliminating the need for pre-reflow baking. The matte tin-plated leads ensure robust solder joint formation per J-STD-002 requirements, making SMA4S15AH compatible with standard lead-free reflow profiles.
SMA4S15AH 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):
- 15V
- Voltage - Breakdown (Min):
- 16.8V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 16.4A
- 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
SMA4S15AH FAQ
1.How can I place an order for SMA4S15AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4S15AH 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 SMA4S15AH reliable?
The price and inventory of SMA4S15AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4S15AH is usually 5 days.
3.What payment methods are accepted for SMA4S15AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4S15AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4S15AH?
SMA4S15AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4S15AH 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 SMA4S15AH?
For technical support, including SMA4S15AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4S15AH requirements.
6.How does Aetrix verify that SMA4S15AH is sourced from the original manufacturer or authorized distributors?
All SMA4S15AH 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 SMA4S15AH meets industry standards.
7.What is the process for return or replacement of SMA4S15AH?
All SMA4S15AH units undergo pre-shipment inspection (PSI). If there is an issue with SMA4S15AH, 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 SMA4S15AH part is unused and in its original packaging.
Return procedure for SMA4S15AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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