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Vishay General Semiconductor - Diodes Division SMAJ14CAHE3/5A
- Part No.:
- SMAJ14CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14CAHE3/5A.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,900
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Product details
Overview
SMAJ14CAHE3/5A 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 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), used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems.
For engineers reviewing the SMAJ14CAHE3/5A datasheet, SMAJ14CAHE3/5A pinout, SMAJ14CAHE3/5A application, or SMAJ14CAHE3/5A equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 120 °C/W junction-to-ambient thermal resistance, and compatibility with automated SMT assembly on standard PCB pad 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 leakage performance (<1.0 μA at VWM) and fast response time (<1.0 ps), critical for suppressing ESD and inductive switching spikes before sensitive downstream components are damaged.
The device is rated for 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, with thermal performance defined by RθJA = 120 °C/W and RθJL = 30 °C/W. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive underhood and body electronics applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 14 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 15.6–17.2 V at 1 mA - Voltage at which device enters avalanche conduction; ensures reliable triggering during transients. |
| VC (Clamping Voltage) | 23.2 V at IPPM = 17.2 A - Maximum voltage seen by protected circuit during 10/1000 μs surge; determines safe overvoltage margin for downstream ICs. |
| PPPM (Peak Pulse Power) | 400 W (≤78 V), 300 W (>78 V) - Surge energy handling capacity; defines survivability against IEC 61000-4-5 Level 4 transients. |
| ID (Reverse Leakage) | ≤1.0 μA at VWM - Low leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm × 4.93 mm footprint; compatible with JEDEC-compliant reflow profiles. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated. Bidirectional configuration has no polarity marking; terminals are symmetrical anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals conduct identically during positive or negative surges; enables placement without orientation check in layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
| 400 W peak pulse power (10/1000 μs) | Withstands repetitive lightning-induced surges per IEC 61000-4-5 without degradation when mounted on 5.0 mm × 5.0 mm copper pads. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD >15 kV), improving protection fidelity for sub-5 V logic interfaces. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture-related popcorn failure or delamination. |
| Glass passivated junction | Ensures stable VBR and low ID over 10+ years of field operation in humid or thermally cycled environments. |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and microcontroller GPIOs from load dump and alternator ripple in door modules and seat controllers. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt transient energy before it reaches MCU I/O pins. Use Value: Maintains signal integrity under 12 V system surges up to ±100 V/500 ms while meeting ISO 16750-2 pulse 5a requirements. |
Use Scenario: Safeguarding analog outputs (4–20 mA) and digital I²C lines of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp on sensor interface lines exposed to relay coil flyback and motor drive noise. Use Value: Limits clamped voltage to ≤23.2 V, preserving ADC reference stability and preventing I²C bus lockup during 1 kV EFT bursts. |
| Consumer Appliance Motor Drive | Telecom Power Input Stage |
|
Use Scenario: Suppressing inductive kickback from brushed DC motor commutation in washing machine control boards. IC Role / Device Role / Timing Role: Parallel-connected TVS across H-bridge supply rails to absorb stored inductor energy during PWM switching transitions. Use Value: Handles 400 W pulses without thermal runaway, reducing need for oversized bulk capacitors and extending MOSFET lifetime. |
Use Scenario: Front-end transient suppression on 48 V DC telecom power inputs subjected to lightning-induced surges per GR-1089-CORE. IC Role / Device Role / Timing Role: First-line defense clamping common-mode surges between power and return lines before DC/DC converter input stage. Use Value: Symmetrical bidirectional behavior ensures equal protection on both polarities of floating 48 V supply, eliminating need for dual unidirectional devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14CA-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free compliance is mandated by OEM environmental policy. | Direct material substitution if halogen-free requirement applies; same footprint, thermal, and electrical behavior. |
| SMBJ14CAHE3/5A | Same VWM/VBR/VC ratings but in larger SMB (DO-214AA) package with higher PPPM (600 W) and lower RθJA (80 °C/W). | Better thermal dissipation and surge margin; requires larger PCB area and different pad layout. | Preferred for high-reliability 24 V systems with frequent surge exposure; not drop-in due to package size change. |
Compared with SMAJ14CAHE3/5A, the M3 variant offers identical protection performance with halogen-free materials, while SMBJ14CAHE3/5A delivers higher surge robustness at the cost of board space-enabling trade-offs between density and ruggedness in final design.
Availability
SMAJ14CAHE3/5A is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, consumer appliance motor controls, and telecom power input stages requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ14CAHE3/5A 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, precision, and automotive-grade qualification.
The SMAJ series is engineered for robust transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where consistent clamping performance and AEC-Q101 validation are mandatory.
FAQ
What does the "HE3" suffix indicate in SMAJ14CAHE3/5A?
The "HE3" suffix denotes that SMAJ14CAHE3/5A is RoHS-compliant and AEC-Q101 qualified for automotive applications. It also specifies matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards, distinguishing it from commercial-grade E3 or halogen-free HM3 variants.
Is SMAJ14CAHE3/5A suitable for protecting 3.3 V logic circuits?
No-SMAJ14CAHE3/5A is not suitable for direct protection of 3.3 V logic circuits because its 14 V stand-off voltage (VWM) and 23.2 V clamping voltage (VC) far exceed safe operating limits for 3.3 V I/O. For such circuits, lower-voltage TVS devices like SMAJ5.0CAHE3/5A (VWM = 5.0 V, VC = 9.2 V) are required.
How does the bidirectional nature of SMAJ14CAHE3/5A affect PCB layout?
The bidirectional nature of SMAJ14CAHE3/5A eliminates polarity constraints during placement-no cathode band orientation is needed, simplifying automated assembly and reducing risk of misorientation. Layout requires symmetrical 5.0 mm × 5.0 mm copper pads per terminal to sustain 400 W pulse power per the datasheet's thermal specification.
What is the maximum operating temperature for SMAJ14CAHE3/5A?
SMAJ14CAHE3/5A has a maximum junction temperature (TJ max.) of +150 °C and an operating junction/storage temperature range of –55 °C to +150 °C. This allows use in under-hood automotive locations and industrial enclosures where ambient temperatures reach +105 °C, provided PCB thermal design maintains junction temperature within limit.
Does SMAJ14CAHE3/5A meet any industry surge immunity standards?
SMAJ14CAHE3/5A supports compliance with IEC 61000-4-5 (surge immunity) and ISO 16750-2 (automotive load dump) when applied per recommended layout-specifically using 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Its 400 W peak pulse rating aligns with Level 4 (4 kV line-earth, 2 kV line-line) test requirements.
SMAJ14CAHE3/5A 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ14CAHE3/5A FAQ
1.How can I place an order for SMAJ14CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14CAHE3/5A 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 SMAJ14CAHE3/5A reliable?
The price and inventory of SMAJ14CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ14CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ14CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14CAHE3/5A?
SMAJ14CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14CAHE3/5A 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 SMAJ14CAHE3/5A?
For technical support, including SMAJ14CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ14CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ14CAHE3/5A 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 SMAJ14CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ14CAHE3/5A?
All SMAJ14CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14CAHE3/5A, 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 SMAJ14CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ14CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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