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Vishay General Semiconductor - Diodes Division SMAJ15CAHM3/H
- Part No.:
- SMAJ15CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15CAHM3/H.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,810
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Product details
Overview
SMAJ15CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection on signal and power lines. It features a 15 V stand-off voltage (VWM), 16.7–18.5 V breakdown voltage (VBR) at 1 mA, 24.4 V maximum clamping voltage (VC) at 16.4 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the SMAJ15CAHM3/H datasheet, SMAJ15CAHM3/H pinout, SMAJ15CAHM3/H application, or SMAJ15CAHM3/H equivalent, this device delivers AEC-Q101 qualified surge immunity, low incremental surge resistance, and MSL Level 1 moisture sensitivity - critical for high-reliability PCB designs requiring repeatable ESD and lightning-induced transient suppression without derating above 78 V.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical electrical characteristics in forward and reverse directions. Its glass-passivated junction enables sub-nanosecond response to transients, while the low clamping ratio (VC/VBR ≈ 1.45) ensures minimal overvoltage exposure to downstream ICs during 400 W surges.
The device is rated for continuous power dissipation of 3.3 W at 50 °C on infinite heatsink, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It supports operating junction temperatures from –55 °C to +150 °C and meets JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse stand-off voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 16.7 V / 18.5 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 24.4 V at 16.4 A - Clamped voltage under 400 W 10/1000 μs surge; limits stress on protected circuitry to safe levels. |
| IPPM | 16.4 A - Peak pulse current capability; determines minimum trace width and layout robustness needed for surge path. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; validated at TA = 25 °C with derating above 78 V. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.0 mm × 5.0 mm copper pad footprint; compatible with automated placement and reflow. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity-unmarked for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Acts as cathode in one polarity and anode in the other; no marking required per bidirectional design. |
| Cathode | Transient current exit (bidirectional) | Same physical terminal as Anode; symmetrical conduction eliminates polarity dependency in PCB layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per JESD22 standards. |
| 400 W peak pulse power | Withstands 10/1000 μs transients up to 400 W at 25 °C; maintains 300 W capability above 78 V per derating curve. |
| Low clamping ratio | VC/VBR ≈ 1.45 ensures minimal overvoltage overshoot during surge events, protecting sensitive 3.3 V or 5 V logic interfaces. |
| MSL Level 1 | Moisture sensitivity level 1 per J-STD-020 - no floor life limitation; supports standard SMT reflow without baking. |
| Glass passivated junction | Enables <1 ns response time and stable leakage performance (<1 μA at VWM) across –55 °C to +150 °C. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt surge energy before reaching signal conditioning ICs. Use Value: Maintains signal integrity by limiting transient overvoltage to ≤24.4 V, preventing latch-up or damage to 5 V tolerant microcontrollers and ADC front-ends. |
Use Scenario: Safeguarding PLC digital input channels against field-wiring induced surges and relay contact bounce in factory automation systems. IC Role / Device Role / Timing Role: Primary transient suppressor on 24 V DC input lines, mounted adjacent to terminal block to minimize inductive loop area. Use Value: Enables >100,000 surge cycles at 400 W without degradation, supporting long-term maintenance-free operation in harsh industrial environments. |
| Telecom Line Interface | Consumer Power Adapter Output |
|
Use Scenario: Shielding Ethernet PHYs and PoE injectors from ESD and lightning-induced surges on twisted-pair data lines. IC Role / Device Role / Timing Role: Secondary-level protector after gas discharge tube (GDT), providing fast-response clamping for residual transients. Use Value: Low capacitance (≈100 pF at 0 V) avoids signal integrity loss on 100BASE-TX lines while delivering 24.4 V clamping at 16.4 A. |
Use Scenario: Suppressing switching noise and output overvoltage spikes in AC/DC adapters powering USB-C PD and smart home hubs. IC Role / Device Role / Timing Role: Output-side TVS on regulated 5 V/9 V/12 V rails to prevent damage from regulator fault conditions or capacitor discharge events. Use Value: Halogen-free, RoHS-compliant HM3 suffix ensures compliance with global environmental regulations for consumer end-products. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15CAHE3/H | RoHS-compliant commercial grade (non-halogen-free); same VWM, VBR, VC, and PPPM specs. | Lacks halogen-free certification; suitable for non-regulated commercial equipment where material compliance is not mandated. | Select SMAJ15CAHE3/H when halogen-free content is not required and cost optimization is prioritized. |
| SMAJ15CAHM3/A | Identical electrical and mechanical specs; differs only in revision code ("A" vs "H") and tape/reel packaging quantity (1800 pcs vs unspecified). | No functional difference; "A" revision may reflect minor process update but maintains full form-fit-function compatibility. | Choose SMAJ15CAHM3/A if legacy BOM references revision "A", or when sourcing from alternate reel size configurations. |
Compared with SMAJ15CAHE3/H and SMAJ15CAHM3/A, the SMAJ15CAHM3/H provides halogen-free construction essential for automotive and green electronics compliance, while maintaining identical surge performance and mounting footprint - making it the preferred choice where material sustainability and AEC-Q101 qualification are jointly required.
Availability
SMAJ15CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, and telecom line interface applications requiring stable component supply, long-term lifecycle support, and AEC-Q101 assurance.
Supply support for SMAJ15CAHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for high-energy transient suppression in demanding environments - targeting automotive, industrial, and telecom systems where robustness against ESD, lightning, and inductive switching surges is mission-critical.
FAQ
What is the clamping voltage of the SMAJ15CAHM3/H under a 400 W transient?
The SMAJ15CAHM3/H clamps to a maximum of 24.4 V at 16.4 A peak pulse current, corresponding to a 400 W 10/1000 μs waveform. This value is measured per standard test conditions (TA = 25 °C, mounted on 0.2" × 0.2" copper pads), and remains stable across its –55 °C to +150 °C operating junction temperature range. The SMAJ15CAHM3/H achieves this with low incremental surge resistance, minimizing voltage overshoot during fast-rising transients.
Is SMAJ15CAHM3/H suitable for automotive applications?
Yes, the SMAJ15CAHM3/H is AEC-Q101 qualified and explicitly designated for automotive use via its HM3 suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It undergoes rigorous stress testing including temperature cycling, high-temperature operating life, and mechanical shock - validating its suitability for under-hood and cabin-mounted ECUs, sensor modules, and infotainment power rails. The SMAJ15CAHM3/H meets all requirements for ISO 7637-2 pulse protection in 12 V vehicle systems.
How does the bidirectional design of SMAJ15CAHM3/H affect PCB layout?
The SMAJ15CAHM3/H has no polarity marking and conducts identically in both directions, eliminating orientation constraints during placement. This simplifies PCB layout by removing the need for cathode band alignment, reduces assembly errors, and allows symmetric routing on differential or AC-coupled lines. The SMAJ15CAHM3/H's DO-214AC package fits standard SMA footprints, and its unmarked terminals support automated optical recognition without polarity verification steps.
What is the maximum steady-state power dissipation for SMAJ15CAHM3/H?
The SMAJ15CAHM3/H has a maximum steady-state power dissipation (PD) of 3.3 W at TA = 50 °C on an infinite heatsink. In typical surface-mount applications with 0.2" × 0.2" copper pads per terminal, derating applies above 25 °C ambient - e.g., ~2.5 W at 70 °C. This rating governs continuous leakage current handling and thermal management in always-on protection circuits. The SMAJ15CAHM3/H's RθJA of 120 °C/W informs board-level thermal design for sustained operation.
Does SMAJ15CAHM3/H meet moisture sensitivity requirements for lead-free reflow?
Yes, the SMAJ15CAHM3/H is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and requires no pre-bake prior to lead-free reflow soldering. Its moisture-resistant molding compound and matte tin-plated leads ensure reliable wetting and joint formation at peak reflow temperatures up to 260 °C. This eliminates handling overhead and supports high-yield SMT manufacturing - a key advantage confirmed in the official Vishay documentation for the SMAJ15CAHM3/H.
SMAJ15CAHM3/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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 16.4A
- 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)
SMAJ15CAHM3/H FAQ
1.How can I place an order for SMAJ15CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15CAHM3/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 SMAJ15CAHM3/H reliable?
The price and inventory of SMAJ15CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ15CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ15CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15CAHM3/H?
SMAJ15CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15CAHM3/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 SMAJ15CAHM3/H?
For technical support, including SMAJ15CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15CAHM3/H requirements.
6.How does Aetrix verify that SMAJ15CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ15CAHM3/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 SMAJ15CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ15CAHM3/H?
All SMAJ15CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15CAHM3/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 SMAJ15CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ15CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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