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Vishay General Semiconductor - Diodes Division SMAJ16CAHM3/H
- Part No.:
- SMAJ16CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ16CAHM3/H.pdf
- Description:
- TVS DIODE 16VWM 26VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,817
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Product details
Overview
SMAJ16CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 16 V stand-off voltage (VWM), 26.0 V maximum clamping voltage (VC) at 15.4 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), making it suitable for automotive-grade ESD and surge protection in sensor interfaces and power rails.
For engineers reviewing the SMAJ16CAHM3/H datasheet, SMAJ16CAHM3/H pinout, SMAJ16CAHM3/H application, or SMAJ16CAHM3/H equivalent, this device is evaluated for bidirectional transient suppression in AEC-Q101-compliant automotive systems, industrial I/O protection, and low-capacitance signal line safeguarding where stable clamping and MSL Level 1 reflow compatibility are required.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity sensitivity. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at VWM), while the 120 °C/W junction-to-ambient thermal resistance supports operation up to +150 °C junction temperature under defined PCB pad conditions.
The device meets JESD201 Class 2 whisker resistance and is halogen-free and RoHS-compliant per HM3 suffix designation. Its 10/1000 μs surge rating applies with derating above 25 °C ambient, and clamping performance is validated at IPPM = 15.4 A - corresponding to the specified 26.0 V VC - ensuring predictable overvoltage limiting during lightning or inductive-switching events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 16 V - Maximum continuous reverse operating voltage before significant conduction begins; defines safe operating margin below clamping threshold. |
| VBR min/max | 17.8 V / 19.7 V at 1.0 mA test current - Confirmed breakdown range ensures reliable triggering across process variation and temperature. |
| VC @ IPPM | 26.0 V at 15.4 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on downstream ICs or MOSFETs. |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000 μs waveform; sufficient for ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 3 surges. |
| IPPM | 15.4 A - Peak surge current supported at rated clamping voltage; directly maps to protected circuit impedance and energy level. |
| TJ max | +150 °C - Maximum junction temperature rating enables use in under-hood automotive environments and high-ambient industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.0 mm × 5.0 mm copper pad requirement; compatible with automated SMT placement and reflow (MSL Level 1, 260 °C peak). |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; bidirectional configuration has no polarity marking (no cathode band). Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A (bidirectional) | One side of symmetrical PN junction; functions identically as cathode during reverse transient - no DC polarity assignment. |
| Cathode | Terminal B (bidirectional) | Second side of symmetrical junction; interchangeable with Anode under transient stress; no marking on device body. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., CAN, RS-485), or ungrounded power rails without polarity concerns. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units, ADAS sensors, and infotainment power supplies per stress test requirements. |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for global OEM supply chains; no brominated flame retardants in molding compound. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD), improving protection margin for sensitive 3.3 V or 5 V logic interfaces. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C), eliminating bake requirements and simplifying manufacturing flow. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure or temperature sensors in engine bay modules exposed to load dump and ISO 7637-2 transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between signal line and ground, responding within <1 ns to suppress spikes exceeding 16 V. Use Value: Limits voltage seen by ADC input or op-amp buffer to ≤26.0 V, preventing latch-up or permanent damage during 100 V/50 ms load dump events. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers subjected to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Standoff device mounted at connector entry point, conducting only during >16 V transients to shunt energy to chassis ground. Use Value: Withstands repetitive 400 W surges without degradation, maintaining protection integrity across 100,000+ switching cycles in factory automation environments. |
| Consumer USB Port ESD Protection | Telecom Line Interface Protection |
Use Scenario: Secondary-level ESD protection on VBUS and D+/D− lines of USB 2.0 ports in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Fast-response TVS absorbing ±15 kV contact discharge (IEC 61000-4-2) before reaching USB transceiver IC. Use Value: Low clamping voltage (26.0 V) prevents overstress on 5 V tolerant PHY, while bidirectional symmetry eliminates layout polarity errors. |
Use Scenario: Overvoltage protection on tip/ring lines of VoIP phone interfaces connected to POTS wiring susceptible to lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge limiter placed before line driver/receiver ICs, clamping common-mode transients up to 100 V. Use Value: 400 W peak power rating handles IEC 61000-4-5 Combination Wave (10/700 μs) surges without failure, preserving voice quality and call reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ16CAHE3/H | Same electrical specs and package, but RoHS-compliant commercial grade (not halogen-free); lacks JESD201 Class 2 whisker resistance. | Approved for non-automotive industrial and consumer use; not AEC-Q101 qualified. | Select when halogen-free content or automotive qualification is not required; lower cost alternative for commercial designs. |
| SMBJ16CAHM3 | Same VWM/VC, but SMB (DO-214AA) package - 30 % larger footprint and higher thermal resistance (RθJA = 140 °C/W vs. 120 °C/W). | Used where board space allows larger pad layout or where higher surge margin (600 W rating) justifies footprint trade-off. | Choose when higher peak power (600 W) is needed and PCB real estate permits SMB outline; not drop-in compatible due to different land pattern. |
Compared with SMAJ16CAHE3/H, the SMAJ16CAHM3/H adds halogen-free construction and AEC-Q101 qualification for automotive use; compared with SMBJ16CAHM3, it offers identical clamping performance in a smaller SMA footprint with better thermal efficiency, though at reduced 400 W surge rating.
Availability
SMAJ16CAHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ16CAHM3/H 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMAJ series is engineered for robust transient suppression in harsh environments, targeting automotive, industrial, and communications applications where consistent clamping, AEC-Q101 validation, and surface-mount manufacturability are critical.
FAQ
What does the 'HM3' suffix indicate in SMAJ16CAHM3/H?
The 'HM3' suffix in SMAJ16CAHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification and JESD201 Class 2 whisker resistance. It confirms the device meets automotive reliability standards and environmental regulations, distinguishing it from commercial-grade variants like SMAJ16CAHE3/H. This makes SMAJ16CAHM3/H suitable for under-hood and safety-critical vehicle subsystems where material compliance and long-term stability are mandatory.
Is SMAJ16CAHM3/H unidirectional or bidirectional, and how does that affect circuit placement?
SMAJ16CAHM3/H is a bidirectional TVS diode, meaning it provides symmetrical clamping in both polarities without cathode marking. This allows placement across any two nodes requiring transient suppression - such as differential signal pairs, AC power lines, or floating grounds - without concern for orientation. Unlike unidirectional types, SMAJ16CAHM3/H avoids incorrect installation errors and simplifies layout for balanced interfaces like CAN or RS-485 where polarity reversal could otherwise compromise protection.
What is the maximum clamping voltage of SMAJ16CAHM3/H, and under what test condition is it specified?
The maximum clamping voltage of SMAJ16CAHM3/H is 26.0 V, measured at a peak pulse current (IPPM) of 15.4 A using the standardized 10/1000 μs double-exponential surge waveform. This value represents the upper limit of voltage imposed on protected circuitry during worst-case transient events, and is guaranteed across temperature and process variation per Vishay's characterization. Designers use this figure to verify margin against the absolute maximum ratings of downstream components like microcontrollers or transceivers.
Can SMAJ16CAHM3/H be used in place of SMAJ16A or SMAJ16CA with different suffixes?
No - SMAJ16CAHM3/H is not a direct replacement for SMAJ16A (unidirectional) or SMAJ16CAHE3/H (non-halogen-free, non-AEC-Q101). While electrical parameters like VWM and VC align, the HM3 suffix certifies halogen-free materials and automotive qualification, which are design-critical in regulated applications. Substituting without validation risks non-compliance with OEM material declarations or failure under automotive stress testing. Always verify qualification scope and material content before interchange.
What PCB layout guidance applies to SMAJ16CAHM3/H to achieve its rated 400 W pulse power?
To achieve the full 400 W peak pulse power rating, SMAJ16CAHM3/H must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. Smaller pads increase thermal impedance, causing junction temperature to exceed safe limits during surge events and degrading clamping performance or causing failure. Use short, wide traces to ground planes and avoid thermal reliefs on TVS pads to ensure effective heat dissipation during transient conduction.
SMAJ16CAHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 16V
- Voltage - Breakdown (Min):
- 17.8V
- Voltage - Clamping (Max) @ Ipp:
- 26V
- Current - Peak Pulse (10/1000µs):
- 15.4A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ16CAHM3/H FAQ
1.How can I place an order for SMAJ16CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ16CAHM3/H 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 SMAJ16CAHM3/H reliable?
The price and inventory of SMAJ16CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ16CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ16CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ16CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ16CAHM3/H?
SMAJ16CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ16CAHM3/H 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 SMAJ16CAHM3/H?
For technical support, including SMAJ16CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ16CAHM3/H requirements.
6.How does Aetrix verify that SMAJ16CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ16CAHM3/H 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 SMAJ16CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ16CAHM3/H?
All SMAJ16CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ16CAHM3/H, 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 SMAJ16CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ16CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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