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Taiwan Semiconductor Corporation SMA4S30AH
- Part No.:
- SMA4S30AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-128
- Datasheet:
-
SMA4S30AH.pdf
- Description:
- TVS DIODE 30VWM 48.7VC SOD128
- Quantity:
- Payment:
- Shipping:
Inventory:6,946
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Product details
Overview
SMA4S30AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 30V working stand-off voltage, 33.5–37.1V breakdown voltage at 1mA, and 48.7V clamping voltage at 8.2A peak pulse current; it is AEC-Q101 qualified and used in automotive BLDC motor control and battery management systems.
For engineers reviewing the SMA4S30AH datasheet, SMA4S30AH pinout, SMA4S30AH application, or SMA4S30AH equivalent, key selection criteria include unidirectional polarity, SOD-128 package thermal performance (RθJL = 20°C/W), 175°C max junction temperature, and compliance with JESD201 Class 2 whisker resistance and RoHS/halogen-free requirements.
Technical Context
The SMA4S30AH operates as a unidirectional avalanche diode for transient overvoltage protection in DC power rails. Its glass-passivated junction ensures stable VBR with low temperature coefficient (0.095%/°C) and supports reliable operation from –55°C to +175°C.
Designed for high-energy transients per 10/1000μs waveform, it delivers 400W non-repetitive peak pulse power with 48.7V clamping at 8.2A, while maintaining <1μA blocking leakage at 30V and 3.5V forward voltage at 25A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1mA | 33.5–37.1 V - Verified avalanche breakdown range ensuring predictable turn-on threshold |
| VC @ IPPM=8.2A | 48.7 V - Clamped voltage during 10/1000μs surge, limiting downstream circuit stress |
| PPPM | 400 W - Peak pulse power handling capability under standardized surge conditions |
| 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 - Extended thermal envelope supporting under-hood automotive deployment |
| Moisture Sensitivity | Level 1 (J-STD-020) - No floor life limitation; safe for standard SMT reflow without baking |
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 of protected line; conducts during reverse surge when cathode is positive |
| Cathode | Avalanche clamping terminal | Connected to higher-potential rail; initiates controlled breakdown above VBR to clamp transients |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Glass-passivated junction | Stable electrical parameters over lifetime and improved moisture resistance vs. epoxy-passivated alternatives |
| VBR tempco ≤ 0.095%/°C | Minimal drift in breakdown threshold across operating temperature range, critical for precision protection |
| J-STD-020 Level 1 rating | Zero floor-life restriction enables direct placement from reel without preconditioning or dry-pack handling |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS directives for environmentally constrained applications |
Applications
| Automotive BLDC Motor Control | Battery Management System (BMS) |
|---|---|
Use Scenario: Protection of gate drivers and MCU power rails against inductive switching spikes in 48V electric power steering modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus input to absorb L×di/dt energy from motor phase commutation. Use Value: 48.7V clamping ensures MCU supply remains below absolute maximum ratings during 8.2A transient events. | Use Scenario: Surge suppression on cell monitor IC supply lines in EV traction battery packs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 30V auxiliary rail feeding analog front-end and isolation barrier components. Use Value: 30V VWM aligns with nominal 24–36V BMS auxiliary supplies while providing margin before clamping onset. |
| LED Headlamp Driver | Industrial SMPS Input Stage |
Use Scenario: Input-side protection in constant-current LED drivers subjected to ISO 7637-2 Pulse 1/2a/5a in automotive lighting modules. IC Role / Device Role / Timing Role: Fast-response unidirectional clamp parallel to bulk capacitor, shunting transients before they reach PWM controller. Use Value: 400W PPPM rating withstands repetitive 10/1000μs surges without degradation in headlamp ECU environments. | Use Scenario: Secondary-side output rail protection in 24V industrial switch-mode power supplies powering PLC I/O modules. IC Role / Device Role / Timing Role: Standoff-rated TVS on regulated 30V output, guarding against feedback loop instability-induced overshoot. Use Value: 175°C TJMAX supports operation in enclosed enclosures with ambient temperatures up to 105°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ30A | Same SOD-128 package; VBR = 33.3–36.8V, VC = 48.4V @ 8.3A, RθJL = 22°C/W | Marginally lower clamping voltage but slightly reduced thermal efficiency | Preferred where tighter VC tolerance is prioritized over thermal derating margin |
| ON Semiconductor 1.5SMC33A | SMB package (larger footprint); VBR = 35.1–38.8V, VC = 53.3V @ 7.5A, PPPM = 1500W | Higher power rating but incompatible SMD footprint and less stringent automotive qualification | Selected only when board space allows SMB and >400W surge capacity is required |
Compared with SMAJ30A and 1.5SMC33A, the SMA4S30AH offers optimal balance of AEC-Q101 compliance, SOD-128 space efficiency, and 20°C/W thermal resistance-making it preferred for compact, thermally constrained automotive modules where consistent 30V standoff and 48.7V clamping are design-critical.
Availability
SMA4S30AH is available at Aetrix Electronics and suitable for automotive BLDC motor control, battery management systems, LED headlamp drivers, and industrial SMPS requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMA4S30AH 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, and MOSFETs for automotive and industrial markets.
The SMA4S series was developed specifically for AEC-Q101-compliant transient protection in space-constrained automotive power electronics, emphasizing thermal robustness, low VBR drift, and J-STD-020 Level 1 manufacturability.
FAQ
What is the polarity configuration of the SMA4S30AH?
The SMA4S30AH is a unidirectional transient voltage suppressor diode, meaning it functions as a reverse-biased avalanche device-conducting only when cathode voltage exceeds anode by ≥VBR. It must be oriented with cathode toward the higher-potential rail. This polarity is confirmed by the cathode band marking on the SOD-128 package and verified in the Electrical Specifications table for SMA4S30AH.
Does the SMA4S30AH meet automotive reliability standards?
Yes, the SMA4S30AH is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias, temperature cycling, and mechanical shock per the AEC-Q101-004 standard. This certification is explicitly stated in the FEATURES section of the official Taiwan Semiconductor datasheet for SMA4S30AH and applies to the full SMA4SxxAH family.
What is the maximum clamping voltage for SMA4S30AH under surge conditions?
The maximum clamping voltage for SMA4S30AH is 48.7 V at 8.2 A peak pulse current with a 10/1000 μs waveform. This value is measured per JEDEC-standard test conditions and appears in the Electrical Specifications table for SMA4S30AH, ensuring predictable overvoltage limiting during real-world transients.
Can SMA4S30AH be used in high-humidity environments?
Yes, the SMA4S30AH features a glass-passivated chip junction and meets J-STD-020 moisture sensitivity level 1, meaning it has no floor life limitation and does not require dry-pack or baking prior to SMT assembly-even in high-humidity manufacturing environments. This is documented in the MECHANICAL DATA section for SMA4S30AH.
What is the thermal resistance from junction to lead for SMA4S30AH?
The junction-to-lead thermal resistance (RθJL) for SMA4S30AH is 20°C/W, measured with the device mounted on a 5 mm × 5 mm copper pad test board. This value is specified in the THERMAL PERFORMANCE table and directly impacts steady-state power dissipation capability in compact layouts.
SMA4S30AH 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):
- 30V
- Voltage - Breakdown (Min):
- 33.5V
- Voltage - Clamping (Max) @ Ipp:
- 48.7V
- Current - Peak Pulse (10/1000µs):
- 8.2A
- 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
SMA4S30AH FAQ
1.How can I place an order for SMA4S30AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4S30AH 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 SMA4S30AH reliable?
The price and inventory of SMA4S30AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4S30AH is usually 5 days.
3.What payment methods are accepted for SMA4S30AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4S30AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4S30AH?
SMA4S30AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4S30AH 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 SMA4S30AH?
For technical support, including SMA4S30AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4S30AH requirements.
6.How does Aetrix verify that SMA4S30AH is sourced from the original manufacturer or authorized distributors?
All SMA4S30AH 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 SMA4S30AH meets industry standards.
7.What is the process for return or replacement of SMA4S30AH?
All SMA4S30AH units undergo pre-shipment inspection (PSI). If there is an issue with SMA4S30AH, 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 SMA4S30AH part is unused and in its original packaging.
Return procedure for SMA4S30AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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