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Vishay General Semiconductor - Diodes Division SMAJ16CAHM3_A/H
- Part No.:
- SMAJ16CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ16CAHM3_A/H.pdf
- Description:
- TVS DIODE 16VWM 26VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,080
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Product details
Overview
SMAJ16CAHM3_A/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 signal or power lines. It features 16 V standoff 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 protecting automotive sensor interfaces and industrial I/O circuits against ESD and inductive switching surges.
For engineers reviewing the SMAJ16CAHM3_A/H datasheet, SMAJ16CAHM3_A/H pinout, SMAJ16CAHM3_A/H application, or SMAJ16CAHM3_A/H equivalent, this device is evaluated for bidirectional surge protection in AEC-Q101-compliant automotive modules, industrial PLC inputs, and telecom line interface stages where low clamping voltage, fast response (<1 ns), and MSL Level 1 reflow compatibility are critical selection criteria.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) ranging from 17.8 V to 19.7 V at 1 mA test current and a temperature coefficient of 0.089 %/°C. Its low incremental surge resistance ensures minimal voltage overshoot during transient events.
The device uses a glass-passivated silicon junction housed in an SMA (DO-214AC) package rated for 150 °C maximum junction temperature, with thermal resistance junction-to-ambient of 120 °C/W and junction-to-lead of 30 °C/W under standard PCB mounting conditions (0.2" × 0.2" copper pads).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 16 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (Breakdown Voltage) | 17.8 V to 19.7 V at 1 mA - Confirmed bidirectional avalanche threshold; ensures symmetrical clamping behavior. |
| VC (Clamping Voltage) | 26.0 V at IPPM = 15.4 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; enables robust IC-level protection. |
| PPPM (Peak Pulse Power) | 400 W - Sustains 10/1000 μs transients without degradation; derates to 300 W above 78 V per spec. |
| ID (Reverse Leakage) | 1.0 μA at VWM - Ultra-low leakage preserves signal integrity and battery life in always-on sensing nodes. |
| TJ max. | 150 °C - Enables operation in under-hood automotive environments and high-temperature industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with automated assembly; meets UL 94 V-0 flammability rating. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity unmarked for bidirectional types per datasheet note.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | No polarity marking required; terminals function identically in either direction for transient clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock per JESD22 standards. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients from load dump or relay coil de-energization without failure. |
| Low clamping voltage (26.0 V @ 15.4 A) | Minimizes stress on downstream 24 V-rated logic ICs and microcontrollers in industrial control systems. |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow soldering without moisture-induced popcorn failure. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for global OEM supply chains and end-of-life recycling. |
Applications
| Automotive Sensor Interface | Industrial PLC Input Module |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from ISO 7637-2 pulse 1/2a/5a transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt surge energy before reaching signal conditioning circuitry. Use Value: Maintains 16 V standoff while clamping to 26.0 V, preserving signal fidelity and preventing latch-up in 3.3 V/5 V microcontrollers interfacing with 12 V/24 V domains. |
Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to inductive kickback from solenoid valves and motor contactors. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input lines, coordinated with series impedance to limit current into optocoupler input stages. Use Value: 400 W surge rating absorbs repetitive 10/1000 μs transients common in factory automation, enabling >100,000 surge cycles without parameter drift. |
| Telecom Line Interface | Consumer Appliance Control Board |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs in base station equipment from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: First-stage protection device mounted adjacent to I/O connector, working in concert with GDT or MOV secondary protection. Use Value: Sub-1 ns response time limits voltage overshoot during fast-rising transients, reducing risk of gate oxide damage in high-speed communication ICs. |
Use Scenario: Securing microcontroller GPIOs and display driver lines in smart home appliances subject to user-handling ESD (IEC 61000-4-2 ±8 kV contact). IC Role / Device Role / Timing Role: Localized ESD suppressor placed within 2 mm of connector or button pad to minimize trace inductance. Use Value: 1.0 μA reverse leakage prevents battery drain in battery-backed clock circuits and maintains low-power sleep mode integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ16CAHE3_A/H | Same electrical specs and package; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Acceptable for commercial/industrial use where automotive qualification is not mandated. | Select when halogen-free content is not required and cost sensitivity favors non-HM3 variant. |
| SMBJ16CAHM3_A/H | Same VWM/VC ratings but in SMB (DO-214AA) package; 600 W peak pulse power rating (vs. 400 W). | Higher power handling suits applications with larger surge margins; larger footprint requires PCB redesign. | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and layout allows SMB footprint. |
Compared with SMAJ16CAHM3_A/H, SMAJ16CAHE3_A/H offers identical protection performance without halogen-free or automotive qualification, while SMBJ16CAHM3_A/H delivers higher surge capacity in a physically larger package-requiring trade-offs between board space, power margin, and compliance scope.
Availability
SMAJ16CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC inputs, and telecom line interface designs requiring stable component supply with full AEC-Q101 and halogen-free compliance.
Supply support for SMAJ16CAHM3_A/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series targets compact, high-reliability transient suppression in automotive, industrial, and communications systems-designed to meet stringent AEC-Q101, IEC 61000-4-2/4-5, and UL 497B requirements with minimal footprint.
FAQ
What is the clamping voltage of SMAJ16CAHM3_A/H at its rated peak pulse current?
The SMAJ16CAHM3_A/H has a maximum clamping voltage (VC) of 26.0 V when subjected to its rated peak pulse current of 15.4 A using the standard 10/1000 μs waveform. This value is measured under defined test conditions per ANSI/IEEE C62.35 and ensures predictable voltage limiting during surge events. The clamping performance is consistent across both polarities due to its bidirectional construction, and the SMAJ16CAHM3_A/H maintains this specification across its qualified operating temperature range.
Is SMAJ16CAHM3_A/H suitable for automotive applications?
Yes, SMAJ16CAHM3_A/H is AEC-Q101 qualified, meaning it has passed rigorous stress tests including temperature cycling, high-temperature operating life, and mechanical shock-specifically validated for automotive under-hood and cabin environments. Its HM3 suffix confirms halogen-free and RoHS compliance, and the device is rated for continuous operation up to 150 °C junction temperature. These attributes make SMAJ16CAHM3_A/H appropriate for engine control units, body electronics, and ADAS sensor interfaces where reliability under harsh conditions is mandatory.
How does the SMAJ16CAHM3_A/H differ from unidirectional variants like SMAJ16AHM3_A/H?
The SMAJ16CAHM3_A/H is bidirectional, providing symmetrical clamping for both positive and negative transients, whereas SMAJ16AHM3_A/H is unidirectional and includes a cathode band marking. Electrically, SMAJ16CAHM3_A/H has identical VWM (16 V) and VC (26.0 V) ratings but supports AC-coupled or floating signal lines without polarity constraints. Its package has no polarity marking, simplifying layout for differential or dual-rail protection. The SMAJ16CAHM3_A/H is selected when protection must function regardless of voltage polarity-such as on RS-485 buses or transformer-coupled interfaces.
What is the thermal resistance of SMAJ16CAHM3_A/H, and how does it affect PCB layout?
The SMAJ16CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This means effective heat dissipation relies heavily on adequate copper area and via stitching to internal ground planes. For sustained power dissipation or high ambient temperatures, designers should avoid narrow traces and consider adding thermal vias under the SMA pads. The SMAJ16CAHM3_A/H's RθJA value assumes standard JEDEC test board conditions; actual performance in custom layouts must be verified via thermal simulation or measurement.
Does SMAJ16CAHM3_A/H meet industry-standard surge immunity requirements?
Yes, SMAJ16CAHM3_A/H is engineered to meet key surge immunity standards including IEC 61000-4-2 (ESD ±30 kV air, ±25 kV contact), IEC 61000-4-4 (EFT 40 A, 5/50 ns), and IEC 61000-4-5 (surge 4 kV line-earth, 2 kV line-line for combination wave). Its 400 W peak pulse power rating aligns with Level 3–4 requirements in industrial and automotive applications. The device's fast response time (<1 ns) and low clamping voltage ensure compliance when implemented with proper layout practices-such as short, low-inductance paths to ground-and used in conjunction with upstream filtering where needed. The SMAJ16CAHM3_A/H itself is not certified to these standards as a standalone system, but its parameters enable compliant system-level design.
SMAJ16CAHM3_A/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:
- Active
- 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_A/H FAQ
1.How can I place an order for SMAJ16CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ16CAHM3_A/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_A/H reliable?
The price and inventory of SMAJ16CAHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ16CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ16CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ16CAHM3_A/H?
SMAJ16CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ16CAHM3_A/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_A/H?
For technical support, including SMAJ16CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ16CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ16CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ16CAHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ16CAHM3_A/H?
All SMAJ16CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ16CAHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMAJ16CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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