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Taiwan Semiconductor Corporation SMA6J18AH
- Part No.:
- SMA6J18AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J18AH.pdf
- Description:
- TVS DIODE 18VWM 28.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,765
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Product details
Overview
SMA6J18AH from Taiwan Semiconductor is a 600W surface-mount transient voltage suppressor (TVS) diode with a working stand-off voltage of 18 V, breakdown voltage range 20–22.1 V, and clamping voltage of 28.3 V at 1.0 A peak pulse current; designed for automotive-grade surge protection in DC/DC converters and power adapters.
For engineers reviewing the SMA6J18AH datasheet, SMA6J18AH pinout, SMA6J18AH application, or SMA6J18AH equivalent, key selection criteria include its AEC-Q101 qualification, DO-214AC (SMA) package compatibility, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and verified 1.0 ps response time under transient stress.
Technical Context
This unidirectional TVS diode uses a glass-passivated junction to achieve fast transient response (<1.0 ps) and stable clamping performance across -55°C to +175°C operating junction temperature. Its single-die configuration in DO-214AC supports automated placement and meets JESD 201 Class 2 whisker resistance.
The device delivers 600 W peak pulse power per 10/1000 µs waveform with maximum reverse leakage of 1.0 µA at 18 V, and clamps transients to ≤28.3 V while sustaining up to 21.2 A peak impulse current - critical for protecting sensitive downstream circuitry in harsh automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse voltage before clamping begins; defines safe operating margin in 12–15 V nominal systems. |
| VBR @ IT=1 mA | 20–22.1 V - Measured breakdown threshold; ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM=1.0 A | 28.3 V - Clamped voltage under full-rated surge; limits stress on protected ICs such as buck controllers or gate drivers. |
| PPPM | 600 W - Peak pulse power handling per 10/1000 µs waveform; enables robust protection against load dump and inductive switching spikes. |
| TJ Range | -55°C to +175°C - Extended junction temperature rating supports under-hood automotive deployment without derating. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with cathode band polarity marking and matte tin-plated leads. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case rated UL 94V-0, cathode-indicated by band, matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward conduction | Connected to ground or low-side reference; enables unidirectional clamping from cathode to anode. |
| Cathode | Transient voltage sensing and clamping node | Connected to protected line (e.g., 12 V rail); conducts when voltage exceeds VBR, shunting surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive reliability including temperature cycling, HTRB, and ESD testing - required for engine control and body electronics. |
| Glass-passivated junction | Ensures stable VBR and low leakage over lifetime; prevents parameter drift under thermal and humidity stress. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Guarantees immunity to real-world automotive transients including battery disconnect spikes and alternator load dump. |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking; eliminates production delays and moisture-related popcorning risk. |
Applications
| Automotive Power Distribution | Industrial DC/DC Converters |
|---|---|
Use Scenario: Protection of 12 V supply lines in vehicle ECUs against load dump and jump-start surges. IC Role / Device Role: Unidirectional TVS clamp placed between battery input and upstream regulator or fuse box. Use Value: Limits transient voltage to ≤28.3 V during 600 W pulses, preventing latch-up or damage to microcontrollers and CAN transceivers. | Use Scenario: Input rail protection in isolated 48 V-to-12 V industrial DC/DC modules exposed to lightning-induced surges. IC Role / Device Role: Primary overvoltage suppression element on secondary-side output bus. Use Value: Withstands repetitive 10/1000 µs transients up to 21.2 A while maintaining <1.0 µA leakage at 18 V standby. |
| LED Driver Power Supplies | On-Board Charger Interfaces |
Use Scenario: Surge suppression on constant-current LED string inputs in outdoor lighting systems. IC Role / Device Role: Parallel-connected TVS across input terminals to absorb switching noise and EFT bursts. Use Value: Fast <1.0 ps response ensures clamping before LED driver ICs experience overvoltage stress during MOSFET switching transitions. | Use Scenario: Input-stage protection in bidirectional OBC front-end circuits interfacing with AC grid and HV battery. IC Role / Device Role: Secondary-level transient guard on LV auxiliary supply rails feeding communication ICs. Use Value: AEC-Q101 qualification and -55°C to +175°C operation ensure reliability across full OBC thermal envelope and duty cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J18A (ON Semiconductor) | Same DO-214AC package, identical VWM/VC specs, but not AEC-Q101 qualified. | Limited to commercial/industrial use; unsuitable for automotive OEM designs requiring qualification evidence. | Select SMA6J18AH when AEC-Q101 documentation and ISO 7637-2 test reports are mandatory. |
| SMC6J18A (Littelfuse) | Higher package (DO-214AB/SMC), 600 W rating, same VWM/VC, but 2.5× larger footprint and 0.3 g weight. | Requires PCB layout change; better suited for high-energy surges where thermal mass matters more than space. | Choose SMA6J18AH for space-constrained automotive modules where DO-214AC footprint and weight (0.060 g) are critical. |
Compared with SMA6J18A and SMC6J18A, the SMA6J18AH uniquely combines AEC-Q101 qualification, DO-214AC compactness, and full ISO 7637-2 compliance - making it the only option that satisfies automotive Tier-1 BOM requirements without layout or qualification trade-offs.
Availability
SMA6J18AH is available at Aetrix Electronics and suitable for automotive power distribution, industrial DC/DC converters, and LED driver power supplies requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMA6J18AH 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 high-reliability protection devices and power management components.
The SMA6Jx AH series is part of TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for automotive and industrial applications demanding robust transient immunity, extended temperature operation, and zero-defect manufacturing.
FAQ
What is the clamping voltage of SMA6J18AH at its rated peak pulse current?
The SMA6J18AH has a maximum clamping voltage (VC) of 28.3 V when subjected to a 1.0 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured and guaranteed per the datasheet's electrical specifications table and ensures downstream ICs remain within safe operating voltage limits during surge events. The SMA6J18AH maintains this clamping performance across its full operating temperature range.
Is SMA6J18AH qualified for automotive applications?
Yes, SMA6J18AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity standards. Its qualification covers temperature cycling, highly accelerated life testing (HALT), and mechanical stress validation - confirming suitability for under-hood and chassis-mounted automotive electronics where reliability under harsh conditions is mandatory. The SMA6J18AH carries full AEC-Q101 certification documentation.
What package type does SMA6J18AH use, and is it compatible with standard SMT processes?
SMA6J18AH uses the DO-214AC (SMA) surface-mount package with matte tin-plated leads that comply with J-STD-002 solderability requirements. It has moisture sensitivity level 1 (per J-STD-020), meaning it can be placed and reflowed using standard SMT equipment without pre-baking. The 0.060 g weight and low-profile form factor support high-speed automated placement in high-volume automotive production lines.
How does SMA6J18AH differ from SMA6J18A in terms of qualification and application scope?
SMA6J18AH differs from SMA6J18A primarily in AEC-Q101 qualification: SMA6J18AH is fully certified for automotive use, while SMA6J18A is commercial-grade only. Both share identical electrical parameters (VWM, VBR, VC, PPPM) and DO-214AC packaging, but only SMA6J18AH provides documented ISO 7637-2 test reports and stress-test data required by Tier-1 suppliers. Therefore, SMA6J18AH is mandatory for automotive BOMs; SMA6J18A may be used in non-automotive industrial designs.
What is the maximum peak pulse current SMA6J18AH can handle, and at what test condition?
SMA6J18AH is rated for a maximum peak pulse current (IPPM) of 21.2 A under the industry-standard 10/1000 µs double-exponential waveform. This rating corresponds directly to its 600 W peak pulse power capability and is validated at TA = 25°C. The device sustains this current while clamping voltage to ≤28.3 V, enabling effective protection of 12 V and 24 V systems against severe transients such as load dump and inductive kickback.
SMA6J18AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMA6J
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 28.3V
- Current - Peak Pulse (10/1000µs):
- 21.2A
- Power - Peak Pulse:
- 600W
- 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:
- DO-214AC (SMA)
SMA6J18AH FAQ
1.How can I place an order for SMA6J18AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J18AH 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 SMA6J18AH reliable?
The price and inventory of SMA6J18AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J18AH is usually 5 days.
3.What payment methods are accepted for SMA6J18AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J18AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J18AH?
SMA6J18AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J18AH 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 SMA6J18AH?
For technical support, including SMA6J18AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J18AH requirements.
6.How does Aetrix verify that SMA6J18AH is sourced from the original manufacturer or authorized distributors?
All SMA6J18AH 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 SMA6J18AH meets industry standards.
7.What is the process for return or replacement of SMA6J18AH?
All SMA6J18AH units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J18AH, 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 SMA6J18AH part is unused and in its original packaging.
Return procedure for SMA6J18AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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