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Taiwan Semiconductor Corporation SMA4S24AH
- Part No.:
- SMA4S24AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-128
- Datasheet:
-
SMA4S24AH.pdf
- Description:
- TVS DIODE 24VWM 39VC SOD128
- Quantity:
- Payment:
- Shipping:
Inventory:850
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Product details
Overview
SMA4S24AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 24V working stand-off voltage, 26.8–29.6V breakdown range at 1mA, and 39.0V clamping voltage at 10.3A peak pulse current; used for overvoltage protection in automotive BLDC motor drives and battery management systems.
For engineers reviewing the SMA4S24AH datasheet, SMA4S24AH pinout, SMA4S24AH application, or SMA4S24AH equivalent, key selection criteria include unidirectional polarity, SOD-128 package thermal performance (RθJL = 20°C/W), AEC-Q101 qualification, and 175°C maximum junction temperature for under-hood reliability.
Technical Context
The SMA4S24AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR range (26.8–29.6V). It clamps transients to ≤39.0V at 10.3A (10/1000μs waveform), dissipating up to 400W non-repetitively while maintaining <1μA leakage at 24V.
Designed for high-reliability automotive environments, it features glass-passivated junction, JESD201 Class 2 whisker resistance, moisture sensitivity level 1, and UL 94V-0 molding compound - all supporting operation from –55°C to +175°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1mA | 26.8–29.6 V - Verified breakdown threshold ensuring predictable turn-on during transients |
| VC @ IPPM=10.3A | 39.0 V - Clamped voltage limiting downstream circuit stress during 400W surge events |
| PPPM | 400 W - Peak pulse power handling per 10/1000μs waveform, derated above 25°C ambient |
| RθJL | 20 °C/W - Junction-to-lead thermal resistance enabling efficient heat transfer to PCB copper pad |
| Junction Temp Range | –55°C to +175°C - Full operational range validated for under-hood automotive placement |
| AEC-Q101 Qualified | Yes - Certified for automotive electronic components per stress test requirements |
Pinout & Package
Package: SOD-128 - Surface-mount, flat lead, unidirectional device with cathode band marking; 5mm × 5mm copper pad recommended for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24V rail); conducts avalanche current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Glass-passivated junction | Enhanced long-term stability and moisture resistance vs. epoxy-passivated alternatives |
| VBR tempco ≤0.095%/°C | Predictable voltage shift across –55°C to +175°C, critical for precision clamping in wide-temp environments |
| UL 94V-0 molding compound | Flame-retardant encapsulation meeting automotive safety standards for board-level fire resistance |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth on matte tin leads, eliminating latent short-circuit risk in high-reliability assemblies |
Applications
| BLDC Motor Drive Protection | Battery Management System (BMS) |
|---|---|
Use Scenario: Suppresses inductive kickback spikes generated during PWM switching of 24V BLDC motor phases. IC Role / Device Role / Timing Role: Unidirectional TVS placed across motor phase-to-ground to clamp flyback voltages below MOSFET drain rating. Use Value: Limits transient voltage to ≤39.0V, preventing gate oxide damage and ensuring >100,000-cycle reliability per AEC-Q101 stress profile. | Use Scenario: Protects 24V battery cell monitoring ICs and communication lines from load dump and jump-start surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on main battery input rail, absorbing 400W pulses without degradation. Use Value: Maintains <1μA leakage at 24V, avoiding parasitic drain on low-power BMS sleep states while surviving 120V/50ms load dump per ISO 7637-2. |
| Automotive Lighting Control | Industrial SMPS Input Stage |
Use Scenario: Shields LED driver ICs and CAN/LIN transceivers from alternator ripple and relay-switching transients in headlamp modules. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24V supply rail upstream of DC-DC converters and microcontrollers. Use Value: Clamps 10/1000μs surges to 39.0V within 1ns response time, preserving signal integrity on 500kbps LIN bus interfaces. | Use Scenario: Safeguards primary-side controllers and rectifiers in 24V-input industrial switch-mode power supplies subjected to AC line transients. IC Role / Device Role / Timing Role: Input-stage TVS parallel to bulk capacitor, diverting surge energy before it reaches active regulation circuitry. Use Value: Delivers 400W peak power handling with RθJL = 20°C/W, enabling stable operation at 85°C ambient without derating in enclosed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ24A | Same SOD-128 package, 24V VWM, but VC = 38.9V @ 10.3A; RθJA = 65°C/W vs. TSC's 62°C/W | Identical use in BLDC and BMS; slightly tighter VC tolerance but higher thermal resistance | Preferred where minimal clamping overshoot is prioritized over thermal margin |
| Vishay SMA6J24A | 400W rating, same VWM/VBR range, but AEC-Q101 not explicitly stated in datasheet; RθJL = 22°C/W | Acceptable for industrial SMPS; not recommended for automotive unless customer-qualified | Select only after internal AEC-Q101 requalification if automotive deployment is required |
Compared with SMAJ24A and SMA6J24A, the SMA4S24AH offers superior thermal performance (RθJL = 20°C/W) and guaranteed AEC-Q101 compliance - making it the preferred choice for thermally constrained, automotive-qualified 24V rail protection where long-term reliability under thermal cycling is critical.
Availability
SMA4S24AH is available at Aetrix Electronics and suitable for automotive BLDC motor drives, battery management systems, and industrial switching mode power supplies requiring stable component supply with full traceability and long-lifecycle support.
Supply support for SMA4S24AH 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 Company (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive, industrial, and consumer markets since 1979.
The SMA4SxxAH series is part of TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for robust 24V–60V automotive and industrial rail protection with emphasis on thermal reliability, low leakage, and repeatable clamping performance.
FAQ
What is the maximum clamping voltage of the SMA4S24AH under standard test conditions?
The SMA4S24AH has a maximum clamping voltage (VC) of 39.0 V when subjected to a 10/1000 μs waveform peak pulse current of 10.3 A at TA = 25°C. This value is measured per JEDEC standards and ensures downstream components remain within safe voltage limits during transient events. The SMA4S24AH maintains this clamping performance across its qualified operating temperature range.
Is the SMA4S24AH suitable for automotive applications requiring AEC-Q101 certification?
Yes, the SMA4S24AH is explicitly AEC-Q101 qualified per the manufacturer's documentation. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and ESD verification - confirming suitability for under-hood automotive systems such as BLDC motor control and battery management. The SMA4S24AH meets all required failure rate and reliability thresholds defined in the AEC-Q101 standard.
What is the thermal resistance from junction to lead (RθJL) for the SMA4S24AH?
The SMA4S24AH has a typical junction-to-lead thermal resistance (RθJL) of 20°C/W when mounted on a 5 mm × 5 mm copper pad PCB per JEDEC test conditions. This low thermal resistance enables efficient heat transfer from the die to the PCB, supporting reliable operation at elevated ambient temperatures - especially important in compact automotive modules where airflow is limited.
Does the SMA4S24AH have unidirectional or bidirectional polarity?
The SMA4S24AH is a unidirectional TVS diode, indicated by its single cathode band marking and specified forward voltage (VF = 3.5 V @ 25 A). It conducts only during reverse overvoltage events on the cathode side and blocks forward current like a standard rectifier diode. This polarity makes it ideal for protecting positive-rail systems such as 24V automotive supplies where ground-referenced transients dominate.
What packaging and reel quantity is available for the SMA4S24AH?
The SMA4S24AH is supplied in the SOD-128 package on tape-and-reel format, with 14,000 units per reel. This standard packaging supports automated SMT assembly and is compatible with industry-standard pick-and-place equipment. Reel markings include the part number "SMA4S24AH" and date code per manufacturer specifications, ensuring full traceability for production lots.
SMA4S24AH 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):
- 24V
- Voltage - Breakdown (Min):
- 26.8V
- Voltage - Clamping (Max) @ Ipp:
- 39V
- Current - Peak Pulse (10/1000µs):
- 10.3A
- 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
SMA4S24AH FAQ
1.How can I place an order for SMA4S24AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4S24AH 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 SMA4S24AH reliable?
The price and inventory of SMA4S24AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4S24AH is usually 5 days.
3.What payment methods are accepted for SMA4S24AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4S24AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4S24AH?
SMA4S24AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4S24AH 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 SMA4S24AH?
For technical support, including SMA4S24AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4S24AH requirements.
6.How does Aetrix verify that SMA4S24AH is sourced from the original manufacturer or authorized distributors?
All SMA4S24AH 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 SMA4S24AH meets industry standards.
7.What is the process for return or replacement of SMA4S24AH?
All SMA4S24AH units undergo pre-shipment inspection (PSI). If there is an issue with SMA4S24AH, 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 SMA4S24AH part is unused and in its original packaging.
Return procedure for SMA4S24AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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