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Taiwan Semiconductor Corporation SMAJ16H
- Part No.:
- SMAJ16H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ16H.pdf
- Description:
- TVS DIODE 16VWM 28.8VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,802
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Product details
Overview
SMAJ16H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power rails and signal lines. It features a 16 V working stand-off voltage (VWM), 17.8–21.8 V breakdown voltage (VBR), 28.8 V maximum clamping voltage (VC) at 13.9 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for automotive-grade surge suppression per ISO 7637-2 Pulse 1/2a/2b/3a/3b.
For engineers reviewing the SMAJ16H datasheet, SMAJ16H pinout, SMAJ16H application, or SMAJ16H equivalent, key selection criteria include clamping performance under 13.9 A transients, unidirectional polarity marking, DO-214AC (SMA) package compatibility with automated placement, and AEC-Q101 qualification for automotive electronics reliability validation.
Technical Context
The SMAJ16H operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown range (17.8–21.8 V at 1 mA test current). Its glass-passivated junction ensures stable leakage (<1 µA at 16 V) and fast response (<1.0 ps rise time from 0 V to VBR min), enabling effective suppression of ESD and load-dump transients.
Thermally rated for TJ = –55 °C to +150 °C and packaged in DO-214AC (SMA), it delivers 400 W peak pulse power at 25 °C - derated linearly above ambient temperature per Fig.2 - and supports steady-state power dissipation up to 1 W, making it suitable for compact, high-reliability board-level protection without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 16 V - maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 17.8 / 21.8 V @ 1 mA - guaranteed avalanche initiation window for predictable turn-on |
| VC @ IPPM | 28.8 V @ 13.9 A - clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 400 W (10/1000 µs) - peak transient energy absorption capability at 25 °C |
| IR @ VWM | <1 µA - negligible leakage current preserves system efficiency and standby power |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline with cathode band marking |
| AEC-Q101 | Qualified - validated for automotive applications including temperature cycling, HTRB, and ESD |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; weight ≈ 0.060 g; UL 94V-0 rated compound; JESD201 Class 2 whisker resistant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V rail); conducts during overvoltage to clamp to VC |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood and infotainment systems requiring extended temperature and reliability compliance |
| Glass-passivated junction | Enhances long-term stability of VBR and IR across thermal and humidity stress cycles |
| Fast response time <1.0 ps | Enables suppression of nanosecond-scale ESD events before sensitive ICs are damaged |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Moisture sensitivity level 1 | Allows unlimited floor life before reflow; no baking required prior to assembly |
Applications
| Automotive Power Rail Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges above 16 V. Use Value: Limits peak voltage to ≤28.8 V during 13.9 A transients, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Safeguarding isolated DC/DC converter inputs in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input stage, absorbing repetitive 400 W pulses without degradation. Use Value: Maintains <1 µA leakage at 16 V, minimizing standby current draw while delivering full 400 W pulse handling per IEC 61000-4-5. |
| LED Driver Supply Line | USB-C Power Delivery Interface |
Use Scenario: Shielding constant-current LED drivers from inductive kickback in vehicle lighting modules. IC Role / Device Role / Timing Role: Fast-acting unidirectional clamp on 12–24 V supply rail, triggered within picoseconds. Use Value: Clamps transients to 28.8 V before driver ICs (e.g., TPS92692) exceed absolute maximum ratings. | Use Scenario: Secondary-level surge protection on USB-C VBUS lines after primary front-end filtering. IC Role / Device Role / Timing Role: Final-stage TVS on 20 V-rated PD power path, activated only during extreme overvoltage events. Use Value: Withstands 13.9 A peak current while holding clamping voltage below 29 V - preserving USB PD 3.1 EPR compliance margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ16AH | Narrower VBR range (17.8–19.7 V vs. 17.8–21.8 V); tighter tolerance improves predictability in precision-clamp designs | Better suited for systems requiring minimal clamping variation across temperature and lot-to-lot production | Select SMAJ16AH where consistent turn-on behavior is critical; SMAJ16H offers broader margin for general-purpose use |
| SMBJ16H | Same electrical specs but SMB (DO-214AA) package - 2.5 mm wider body, higher thermal mass, 600 W peak power rating | Preferred for higher-power or thermally constrained layouts where PCB space allows larger footprint | Choose SMBJ16H if board layout permits larger package and higher pulse energy margin is needed |
Compared with SMAJ16AH and SMBJ16H, the SMAJ16H balances cost-effective DO-214AC packaging, AEC-Q101 qualification, and 400 W surge capability - making it optimal for space-constrained automotive and industrial DC rail protection where standardized SMA footprint and proven reliability are prioritized.
Availability
SMAJ16H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial DC/DC converter input stages, and LED driver supply line applications requiring stable component supply, AEC-Q101 compliance, and consistent 400 W transient handling.
Supply support for SMAJ16H 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 power management devices.
The SMAJ series was developed specifically for AEC-Q101-compliant, surface-mount transient suppression in automotive and industrial environments - emphasizing robust clamping, low leakage, and automated assembly readiness.
FAQ
What is the clamping voltage of SMAJ16H under maximum rated surge current?
The SMAJ16H exhibits a maximum clamping voltage (VC) of 28.8 V when subjected to its rated peak impulse current (IPPM) of 13.9 A using the standard 10/1000 µs waveform. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ16H maintains this clamping performance across its qualified operating junction temperature range of –55 °C to +150 °C, with minor derating per manufacturer's pulse derating curve (Fig.2).
Is SMAJ16H unidirectional or bidirectional, and how is polarity identified?
SMAJ16H is a unidirectional TVS diode, meaning it conducts only in reverse bias above its breakdown voltage. Polarity is marked on the DO-214AC (SMA) package by a cathode band - the banded end connects to the protected line (e.g., 12 V rail), while the anode connects to ground. Bidirectional variants require CH or CAH suffixes (e.g., SMAJ16CH); SMAJ16H has no such suffix and is strictly unidirectional.
Does SMAJ16H meet automotive qualification standards?
Yes, SMAJ16H is AEC-Q101 qualified - verified through stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD per JS-001. It also meets ISO 7637-2 requirements for automotive transient immunity (Pulse 1, 2a, 2b, 3a, 3b), confirming suitability for engine control units, body electronics, and infotainment systems. Full qualification data is documented in Taiwan Semiconductor's A2102 specification release.
What is the maximum steady-state power dissipation rating for SMAJ16H?
The SMAJ16H has a steady-state power dissipation (PD) rating of 1 W at TA = 25 °C. This rating applies to continuous DC or low-frequency reverse-bias conditions - not transient surges. For reliable operation, designers must ensure PCB copper area, ambient temperature, and airflow keep the junction temperature below 150 °C, using the device's thermal resistance (RθJA ≈ 150 °C/W typical for DO-214AC) to calculate allowable power under real-world conditions.
How does SMAJ16H compare to SMAJ16AH in terms of breakdown voltage tolerance?
SMAJ16H specifies a breakdown voltage (VBR) range of 17.8 V to 21.8 V at 1 mA test current, whereas SMAJ16AH tightens this to 17.8 V to 19.7 V. This narrower VBR window in SMAJ16AH reduces clamping variation across production lots and temperature, improving design margin predictability - especially in safety-critical or tightly regulated voltage domains. Both share identical VWM (16 V), VC (28.8 V), and PPPM (400 W), making SMAJ16AH a drop-in alternative where tighter VBR control is required.
SMAJ16H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 16V
- Voltage - Breakdown (Min):
- 17.8V
- Voltage - Clamping (Max) @ Ipp:
- 28.8V
- Current - Peak Pulse (10/1000µs):
- 13.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ16H FAQ
1.How can I place an order for SMAJ16H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ16H 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 SMAJ16H reliable?
The price and inventory of SMAJ16H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ16H is usually 5 days.
3.What payment methods are accepted for SMAJ16H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ16H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ16H?
SMAJ16H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ16H 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 SMAJ16H?
For technical support, including SMAJ16H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ16H requirements.
6.How does Aetrix verify that SMAJ16H is sourced from the original manufacturer or authorized distributors?
All SMAJ16H 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 SMAJ16H meets industry standards.
7.What is the process for return or replacement of SMAJ16H?
All SMAJ16H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ16H, 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 SMAJ16H part is unused and in its original packaging.
Return procedure for SMAJ16H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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