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Vishay General Semiconductor - Diodes Division SMAJ13CAHM3_A/H
- Part No.:
- SMAJ13CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ13CAHM3_A/H.pdf
- Description:
- TVS DIODE 13VWM 21.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ13CAHM3_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 a 13 V stand-off voltage (VWM), 14.4–15.9 V breakdown voltage (VBR) at 1 mA, 21.5 V maximum clamping voltage (VC) at 18.6 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial control systems.
For engineers reviewing the SMAJ13CAHM3_A/H datasheet, SMAJ13CAHM3_A/H pinout, SMAJ13CAHM3_A/H application, or SMAJ13CAHM3_A/H equivalent, this device is selected for robust ESD and surge protection where bidirectional clamping, low leakage (<1.0 μA at VWM), AEC-Q101 qualification, and halogen-free RoHS compliance are required in space-constrained PCB layouts.
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 concerns. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, while the SMA package supports automated placement and meets MSL level 1 per J-STD-020.
The device delivers 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It is rated for operating junction temperatures from –55 °C to +150 °C and qualified to AEC-Q101 for automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 13 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for protected circuitry. |
| VBR min/max | 14.4 V / 15.9 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 21.5 V at 18.6 A - Clamped voltage during 10/1000 μs surge; limits stress on downstream components like microcontrollers or transceivers. |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000 μs waveform; sufficient for IEC 61000-4-5 Level 3 surges. |
| ID @ VWM | <1.0 μA - Ultra-low reverse leakage ensures minimal power loss and signal integrity degradation in high-impedance circuits. |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments and industrial enclosures. |
| Package | SMA (DO-214AC) - Low-profile surface-mount package with 5.0 mm × 5.0 mm copper pad thermal design; compatible with reflow soldering. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL level 1, 260 °C peak reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common node in bidirectional configuration | No marking - symmetrical terminals; either end serves as anode or cathode depending on transient polarity. |
| Cathode | Current exit terminal in forward bias; common node in bidirectional configuration | No marking - identical physical terminal; bidirectional operation eliminates polarity dependency during surge events. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals, differential buses (e.g., RS-485), and ungrounded lines without polarity constraints. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for global OEM supply chains and industrial sustainability mandates. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges (e.g., 2 Ω/12 Ω source impedance) without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V and 5 V logic-level interface protection. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) in engine control modules from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS placed across sensor signal and ground to clamp ±200 V transients within nanoseconds. Use Value: Prevents latch-up or permanent damage to 12-bit ADC inputs and op-amp front-ends while maintaining <1 μA leakage at 13 V system rail. |
Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Mounted at connector entry point to shunt fast-rising EFT bursts (IEC 61000-4-4) and lightning-induced surges. Use Value: Limits clamped voltage to 21.5 V, ensuring compatibility with 24 V DC-rated optocouplers and Schmitt-trigger inputs without derating. |
| USB Port ESD Protection | RS-485 Transceiver Protection |
|
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines after primary polymer TVS, meeting IEC 61000-4-2 ±15 kV contact discharge. IC Role / Device Role / Timing Role: Fast-response bidirectional suppressor absorbing sub-nanosecond ESD events before reaching USB PHY. Use Value: Junction capacitance <100 pF at 0 V (per typical curve Fig. 4) avoids signal integrity degradation at 480 Mbps full-speed operation. |
Use Scenario: Protecting half-duplex RS-485 transceivers (e.g., SN65HVD230) in factory automation networks from cable-induced surges. IC Role / Device Role / Timing Role: Placed across A/B differential pair and ground to suppress common-mode transients up to ±300 V. Use Value: Symmetrical clamping ensures balanced voltage excursion on both lines, preserving differential receiver common-mode range and noise immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ13CAHE3_A/H | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant without halogen-free formulation. | Preferred for commercial/industrial designs where halogen content is not restricted. | Select when halogen-free requirement is absent and cost optimization is prioritized. |
| SMBJ13CAHM3_A/H | Same VWM, VBR, and VC, but SMB (DO-214AA) package - 25 % larger footprint and higher thermal resistance (RθJA = 140 °C/W). | Better suited for lower-density boards or legacy layouts with SMB footprints. | Choose only if existing PCB layout uses SMB pads or higher power derating margin is needed. |
Compared with SMAJ13CAHM3_A/H, the HE3 variant trades halogen-free compliance for slightly lower unit cost, while the SMBJ version sacrifices board space efficiency and thermal performance for mechanical compatibility - making SMAJ13CAHM3_A/H optimal for new AEC-Q101-compliant, high-density automotive designs requiring halogen-free materials.
Availability
SMAJ13CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and RS-485 communication ports requiring stable component supply, long-term lifecycle support, and AEC-Q101 assurance.
Supply support for SMAJ13CAHM3_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, power efficiency, and automotive-grade validation.
The SMAJ series is engineered specifically for high-reliability transient suppression in harsh environments - targeting automotive, industrial control, and telecom infrastructure where robustness against ESD, EFT, and surge events is non-negotiable.
FAQ
What is the clamping voltage of SMAJ13CAHM3_A/H at its rated peak pulse current?
The SMAJ13CAHM3_A/H has a maximum clamping voltage (VC) of 21.5 V at its specified peak pulse current (IPPM) of 18.6 A, measured using the standard 10/1000 μs double-exponential waveform. This value is confirmed in the Electrical Characteristics table on page 2 of Vishay document 88390 and ensures predictable overvoltage limiting for protected ICs. The SMAJ13CAHM3_A/H maintains this clamping performance across its full operating temperature range.
Is SMAJ13CAHM3_A/H suitable for automotive applications?
Yes, SMAJ13CAHM3_A/H is AEC-Q101 qualified, as explicitly stated in the Mechanical Data section and Ordering Information table of Vishay document 88390. Its halogen-free, RoHS-compliant construction, extended temperature range (–55 °C to +150 °C), and validated surge performance make it appropriate for under-hood and chassis-mounted automotive systems. The SMAJ13CAHM3_A/H meets requirements for engine control, body electronics, and ADAS sensor protection.
How does the bidirectional configuration of SMAJ13CAHM3_A/H affect its circuit implementation?
The SMAJ13CAHM3_A/H has no polarity marking and functions identically in both directions, allowing direct placement across any two nodes requiring symmetrical transient suppression - such as differential signal pairs (RS-485, CAN), AC-coupled lines, or ungrounded power rails. Unlike unidirectional TVS diodes, the SMAJ13CAHM3_A/H eliminates orientation errors during assembly and supports floating or isolated protection schemes without additional components.
What is the thermal resistance of SMAJ13CAHM3_A/H, and how does it impact PCB layout?
The SMAJ13CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W, per the Thermal Characteristics table in document 88390. To maintain reliability under repetitive surge conditions, the PCB must use minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. The SMAJ13CAHM3_A/H benefits from internal thermal path optimization but requires adequate copper area to avoid exceeding +150 °C junction temperature.
Does SMAJ13CAHM3_A/H meet industry standards for surge immunity testing?
Yes, SMAJ13CAHM3_A/H is rated for 400 W peak pulse power with a 10/1000 μs waveform - directly aligned with IEC 61000-4-5 Level 3 surge test requirements (1 kV line-to-earth, 2 kV line-to-line). Its clamping behavior, low leakage (<1.0 μA), and fast response time enable compliance in systems requiring protection against lighting-induced transients and inductive switching events. The SMAJ13CAHM3_A/H performance is verified under standardized test conditions defined in ANSI/IEEE C62.35.
SMAJ13CAHM3_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):
- 13V
- Voltage - Breakdown (Min):
- 14.4V
- Voltage - Clamping (Max) @ Ipp:
- 21.5V
- Current - Peak Pulse (10/1000µs):
- 18.6A
- 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)
SMAJ13CAHM3_A/H FAQ
1.How can I place an order for SMAJ13CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ13CAHM3_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 SMAJ13CAHM3_A/H reliable?
The price and inventory of SMAJ13CAHM3_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 SMAJ13CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ13CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ13CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ13CAHM3_A/H?
SMAJ13CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ13CAHM3_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 SMAJ13CAHM3_A/H?
For technical support, including SMAJ13CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ13CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ13CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ13CAHM3_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 SMAJ13CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ13CAHM3_A/H?
All SMAJ13CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ13CAHM3_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 SMAJ13CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ13CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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