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Vishay General Semiconductor - Diodes Division SMA5J12CAHE3_A/H
- Part No.:
- SMA5J12CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J12CAHE3_A/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,868
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Product details
Overview
SMA5J12CAHE3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on signal and power lines. It features a 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR), 19.9 V clamping voltage at 25.1 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform - used to protect automotive sensor interfaces and industrial I/O circuits against ESD and load dump transients.
For engineers reviewing the SMA5J12CAHE3_A/H datasheet, SMA5J12CAHE3_A/H pinout, SMA5J12CAHE3_A/H application, or SMA5J12CAHE3_A/H equivalent, key selection criteria include bidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
The device complies with ANSI/IEEE C62.35 for transient suppression and meets J-STD-020 MSL Level 1 (260 °C peak reflow), supporting lead-free assembly. Thermal resistance is 80 °C/W (junction-to-ambient) and 25 °C/W (junction-to-lead), validated under standard mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 13.3 V / 14.7 V at 1 mA - guaranteed breakdown threshold range for reliable turn-on |
| VC @ IPPM | 19.9 V at 25.1 A - clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 500 W - peak pulse power handling capability under standardized surge waveform |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| Package | SMA (DO-214AC) - surface-mount outline with 5.28 mm length, compatible with standard pick-and-place |
| AEC-Q101 | Qualified - certified for automotive-grade reliability per stress test requirements |
Pinout & Package
Two-terminal bidirectional device in SMA (DO-214AC) package; no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, with 0.074" (1.88 mm) minimum pad width recommended.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Identical terminals - bidirectional operation allows connection without orientation check |
| Case (body) | Thermal and mechanical interface | Plastic molding meets UL 94 V-0; provides mechanical stability and insulation |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines without polarity constraints |
| Glass-passivated junction | Ensures stable VBR over time and temperature, reducing parameter drift in harsh environments |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a) |
| AEC-Q101 qualification | Validates suitability for automotive applications including engine control modules and ADAS sensor interfaces |
| MSL Level 1 rating | Supports standard lead-free reflow profiles up to 260 °C peak without moisture-induced damage |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and jump-start surges in vehicle ECUs. IC Role / Device Role / Timing Role: Standby-mode voltage clamp that activates only during overvoltage events, preserving signal integrity during normal operation. Use Value: Limits transient voltage to ≤19.9 V at 25.1 A, preventing damage to 12 V-rated interface ICs while maintaining AEC-Q101 compliance. | Use Scenario: Safeguarding PLC analog input channels and digital GPIOs against EFT and surge events in factory automation equipment. IC Role / Device Role / Timing Role: Fast-response shunt element that diverts >90% of surge energy away from precision ADC front-ends and microcontroller pins. Use Value: Achieves <1 ns response time and clamps within 19.9 V, ensuring immunity to IEC 61000-4-2 (±8 kV contact) and IEC 61000-4-5 (2 kV line-earth). |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Shielding Ethernet PHYs and PoE injectors from lightning-induced surges on twisted-pair data lines. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed across differential pairs to equalize voltage swing during common-mode transients. Use Value: Symmetric clamping maintains signal balance and prevents DC offset shift during surge events, critical for 100BASE-TX timing margins. | Use Scenario: Secondary-side overvoltage protection in AC/DC adapters for smart home devices exposed to mains transients. IC Role / Device Role / Timing Role: Final-stage clamp after bulk capacitance, absorbing residual spikes that bypass primary-side MOVs. Use Value: 500 W PPPM rating handles repeated 1.2/50 µs surges up to 1.5 kV without degradation, extending adapter lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J12CAHM3_A/H | Halogen-free version; identical electrical specs and AEC-Q101 qualification | No functional difference; selected when halogen-free compliance is mandated by OEM spec | Choose SMA5J12CAHM3_A/H if RoHS + halogen-free material declaration is required |
| SMA5J12AHE3_A/H | Unidirectional variant - cathode-banded, not suitable for AC or differential lines | Requires polarity-aware layout; cannot replace SMA5J12CAHE3_A/H in bidirectional circuits | Select SMA5J12AHE3_A/H only for DC power rail protection where polarity is fixed |
Compared with SMA5J12CAHE3_A/H, the HM3 variant adds halogen-free compliance without performance trade-offs, while the unidirectional AHE3 version lacks symmetrical clamping - making it incompatible for signal-line protection but slightly lower cost for dedicated DC rail use.
Availability
SMA5J12CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface designs requiring stable component supply, AEC-Q101 assurance, and high-reliability surge immunity.
Supply support for SMA5J12CAHE3_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 high-reliability and automotive-grade performance.
The SMA5J series is engineered specifically for high-power-density transient suppression in space-constrained automotive and industrial applications, balancing robust surge handling with surface-mount manufacturability.
FAQ
What is the clamping voltage of the SMA5J12CAHE3_A/H under a 10/1000 µs surge?
The SMA5J12CAHE3_A/H clamps to a maximum of 19.9 V when subjected to its rated peak pulse current of 25.1 A using a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and verified at TA = 25 °C on standard 0.2" × 0.2" copper pads. The SMA5J12CAHE3_A/H maintains this clamping performance across its qualified operating temperature range.
Is SMA5J12CAHE3_A/H suitable for automotive applications?
Yes, SMA5J12CAHE3_A/H is AEC-Q101 qualified and explicitly designated for automotive use with ordering code suffix HE3. It supports under-hood ambient temperatures up to +125 °C and junction temperatures to +150 °C. The SMA5J12CAHE3_A/H is commonly deployed in engine control units, body electronics, and ADAS sensor interfaces requiring certified surge immunity.
Does SMA5J12CAHE3_A/H have polarity markings on the package?
No, SMA5J12CAHE3_A/H has no polarity markings because it is a bidirectional TVS diode. The SMA5J12CAHE3_A/H functions identically regardless of orientation in the circuit - both terminals are electrically symmetrical. This eliminates risk of incorrect placement during automated assembly and simplifies layout for differential or AC-coupled lines.
What is the thermal resistance of SMA5J12CAHE3_A/H?
The SMA5J12CAHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W and junction-to-lead resistance (RθJL) of 25 °C/W, measured under standard mounting conditions (0.2" × 0.2" copper pads per terminal). These values assume JEDEC-standard PCB layout and are critical for calculating safe power derating above 25 °C ambient.
Can SMA5J12CAHE3_A/H replace SMA5J12AHE3_A/H in a design?
No - SMA5J12CAHE3_A/H is bidirectional while SMA5J12AHE3_A/H is unidirectional with cathode band marking. Substituting them requires verifying circuit polarity and transient directionality. In AC, differential, or floating systems, using SMA5J12AHE3_A/H instead of SMA5J12CAHE3_A/H may result in incomplete protection or device failure. Always validate replacement with schematic-level analysis.
SMA5J12CAHE3_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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 25.1A
- Power - Peak Pulse:
- 500W
- 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)
SMA5J12CAHE3_A/H FAQ
1.How can I place an order for SMA5J12CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J12CAHE3_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 SMA5J12CAHE3_A/H reliable?
The price and inventory of SMA5J12CAHE3_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 SMA5J12CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMA5J12CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J12CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J12CAHE3_A/H?
SMA5J12CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J12CAHE3_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 SMA5J12CAHE3_A/H?
For technical support, including SMA5J12CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J12CAHE3_A/H requirements.
6.How does Aetrix verify that SMA5J12CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMA5J12CAHE3_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 SMA5J12CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMA5J12CAHE3_A/H?
All SMA5J12CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J12CAHE3_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 SMA5J12CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMA5J12CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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