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Vishay General Semiconductor - Diodes Division SMAJ14CAHM3/H
- Part No.:
- SMAJ14CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14CAHM3/H.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,217
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Product details
Overview
SMAJ14CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 14 V standoff voltage (VWM), 15.6–17.2 V breakdown voltage (VBR) at 1 mA, 23.2 V maximum clamping voltage (VC) at 17.2 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), targeting protection of MOSFETs, ICs, and sensor signal lines in automotive and industrial systems.
For engineers reviewing the SMAJ14CAHM3/H datasheet, SMAJ14CAHM3/H pinout, SMAJ14CAHM3/H application, or SMAJ14CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, low clamping ratio (VC/VWM ≈ 1.66), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This device operates as a silicon avalanche diode optimized for fast transient suppression. Its bidirectional symmetry enables identical clamping behavior in both polarities, eliminating polarity concerns in AC-coupled or floating signal paths. The glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
Thermal performance is defined by RθJA = 120 °C/W and RθJL = 30 °C/W, requiring careful PCB copper pad design (0.2" × 0.2" per terminal) to sustain 400 W pulses. It meets MSL Level 1 (260 °C reflow peak) and supports automotive-grade operation from –55 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR min/max | 15.6 V / 17.2 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 23.2 V at 17.2 A - Clamped voltage seen by downstream components during 10/1000 μs surge; limits stress on sensitive loads. |
| PPPM | 400 W (≤78 V) - Peak surge energy handling capacity; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) and ISO 7637-2 Pulse 1/2a. |
| ID @ VWM | 1.0 μA - Reverse leakage at rated standoff; negligible loading on high-impedance signal lines or supply rails. |
| TJ max | +150 °C - Maximum junction temperature; supports under-hood automotive and industrial ambient conditions. |
| Package | SMA (DO-214AC) - Surface-mount outline with 2.54 mm lead pitch; compatible with standard pick-and-place and reflow processes. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction terminals | Interchangeable terminals; no cathode band marking; identical clamping behavior in either direction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for global OEM supply chains without compromising surge robustness. |
| 400 W peak pulse power (10/1000 μs) | Supports high-energy transients common in 12 V/24 V vehicle electrical systems and industrial motor drives. |
| Low clamping ratio (VC/VWM = 1.66) | Minimizes overvoltage exposure to protected ICs while maintaining margin above VWM for noise immunity. |
| MSL Level 1 moisture sensitivity | Enables standard SMT assembly without dry-pack or baking; simplifies manufacturing logistics. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching spikes in vehicles. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential or single-ended signal lines upstream of interface ICs. Use Value: Limits transient voltage to ≤23.2 V during 17.2 A surges, preventing latch-up or gate oxide damage in automotive-grade transceivers and ADC front-ends. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring induced surges and ground bounce. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V DC input channels to shunt surge energy before reaching optocoupler or Schmitt-trigger input stages. Use Value: Withstands repeated 400 W transients without degradation, ensuring long-term reliability in factory automation environments with frequent ESD and switching noise. |
| Consumer Power Adapter Input | Telecom Line Interface Protection |
Use Scenario: Secondary-side overvoltage protection in AC/DC adapters for USB-C PD and smart home devices subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-clamp device across DC output rails (e.g., 12 V or 15 V) to protect downstream PMICs and microcontrollers. Use Value: 14 V VWM aligns with common adapter output tolerances; 23.2 V VC prevents brownout or reset during transient events without triggering undervoltage lockout. |
Use Scenario: Surge protection on Ethernet PHY or RS-485 data lines in network equipment exposed to induced surges from nearby power cables or lightning. IC Role / Device Role / Timing Role: Bidirectional TVS placed differentially across twisted-pair lines to suppress common-mode and differential-mode transients. Use Value: Symmetrical clamping ensures balanced protection without skewing signal integrity; <1 μA leakage preserves high-impedance line biasing in multi-drop configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14CAHE3/H | Same electrical specs but RoHS-compliant commercial grade (non-halogen-free); lacks halogen-free certification. | Suitable for non-automotive industrial or consumer applications where halogen-free compliance is not mandated. | Select SMAJ14CAHE3/H when halogen-free material is not required and cost optimization is prioritized. |
| SMAJ14A-HM3/H | Unidirectional version; includes cathode band marking; VF = 3.5 V at 25 A forward conduction. | Applicable only in DC-biased circuits where polarity is fixed and forward conduction must be considered. | Choose SMAJ14A-HM3/H only if unidirectional clamping is explicitly needed and reverse leakage tolerance allows. |
Compared with SMAJ14CAHM3/H, SMAJ14CAHE3/H offers identical surge performance without halogen-free assurance, while SMAJ14A-HM3/H introduces polarity dependency and forward voltage drop-making SMAJ14CAHM3/H the optimal choice for polarity-agnostic, automotive-qualified, halogen-free designs.
Availability
SMAJ14CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMAJ14CAHM3/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 validation.
The SMAJ series targets board-level transient protection in harsh environments, with design focus on automotive AEC-Q101 compliance, high surge robustness, and seamless SMT integration for safety-critical and industrial systems.
FAQ
What is the clamping voltage of SMAJ14CAHM3/H at its rated peak pulse current?
The SMAJ14CAHM3/H has a maximum clamping voltage (VC) of 23.2 V at 17.2 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024. The clamping performance ensures protected circuitry remains below critical overvoltage thresholds during surge events. SMAJ14CAHM3/H maintains this specification across its full operating temperature range.
Is SMAJ14CAHM3/H qualified for automotive applications?
Yes, SMAJ14CAHM3/H is AEC-Q101 qualified, as indicated by the "HM3" suffix and documented in Vishay's ordering information and thermal characteristics notes. It is specifically intended for automotive use cases including engine control units, body electronics, and ADAS sensor interfaces. The qualification covers temperature cycling, humidity testing, and surge endurance-ensuring reliability in under-hood and chassis-mounted environments where SMAJ14CAHM3/H operates from –55 °C to +150 °C.
Does SMAJ14CAHM3/H have polarity markings on the package?
No, SMAJ14CAHM3/H does not have polarity markings such as a cathode band because it is a bidirectional TVS diode. The device functions identically in both directions, with symmetrical breakdown and clamping characteristics. This eliminates orientation concerns during automated placement and simplifies layout for AC-coupled or floating signal lines. The SMA (DO-214AC) package is physically symmetric, and Vishay explicitly states "no marking on bidirectional types" in the mechanical data section of the datasheet for SMAJ14CAHM3/H.
What is the maximum steady-state power dissipation for SMAJ14CAHM3/H?
The SMAJ14CAHM3/H has a maximum steady-state power dissipation (PD) of 3.3 W at TA = 50 °C on an infinite heatsink. This rating reflects continuous DC or low-frequency power handling-not surge capability. In practical PCB layouts, derating is required based on actual thermal resistance; typical RθJA is 120 °C/W, meaning even 0.5 W can raise junction temperature significantly without adequate copper area. SMAJ14CAHM3/H is not intended for sustained power dissipation but rather for transient energy absorption.
How does the halogen-free status of SMAJ14CAHM3/H impact its compliance and usage?
SMAJ14CAHM3/H uses halogen-free molding compound and matte tin-plated leads, meeting both RoHS Directive 2011/65/EU and IEC 61249-2-21:2011 requirements. This status is verified in Vishay's material categorization documentation (www.vishay.com/doc?99912) and enables use in environmentally regulated markets including EU automotive OEMs and green-certified industrial equipment. The halogen-free construction does not affect electrical performance-SMAJ14CAHM3/H retains identical VWM, VBR, VC, and PPPM ratings versus non-halogen variants.
SMAJ14CAHM3/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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 17.2A
- 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)
SMAJ14CAHM3/H FAQ
1.How can I place an order for SMAJ14CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14CAHM3/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 SMAJ14CAHM3/H reliable?
The price and inventory of SMAJ14CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ14CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ14CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14CAHM3/H?
SMAJ14CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14CAHM3/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 SMAJ14CAHM3/H?
For technical support, including SMAJ14CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14CAHM3/H requirements.
6.How does Aetrix verify that SMAJ14CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ14CAHM3/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 SMAJ14CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ14CAHM3/H?
All SMAJ14CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14CAHM3/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 SMAJ14CAHM3/H part is unused and in its original packaging.
Return procedure for SMAJ14CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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