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Vishay General Semiconductor - Diodes Division SMA5J12CAHM3_A/I
- Part No.:
- SMA5J12CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J12CAHM3_A/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,131
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Product details
Overview
SMA5J12CAHM3_A/I 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) at 1 mA, 500 W peak pulse power (10/1000 µs), clamping voltage of 19.9 V at 25.1 A, and operates from –55 °C to +150 °C. It is used to protect automotive sensor interfaces against ISO 7637-2 load dump and inductive switching transients.
For engineers reviewing the SMA5J12CAHM3_A/I datasheet, SMA5J12CAHM3_A/I pinout, SMA5J12CAHM3_A/I application, or SMA5J12CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, 500 W surge rating, and compatibility with automated SMT assembly on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode employs a glass-passivated silicon junction optimized for fast response (<1 ns) and low incremental surge resistance. Its bidirectional architecture enables symmetrical clamping in both polarities without polarity marking, making it suitable for AC-coupled or floating signal lines where voltage reversal occurs.
The device meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), has a typical junction-to-ambient thermal resistance of 80 °C/W, and is qualified to AEC-Q101 for automotive under-hood applications. Its 19.9 V clamping voltage at 25.1 A ensures robust overvoltage protection while maintaining safe margin below IC absolute maximum ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before significant leakage; defines upper limit of normal signal swing. |
| VBR min/max | 13.3 V / 14.7 V at 1 mA - Confirmed breakdown range ensuring reliable triggering above VWM with margin. |
| VC @ IPPM | 19.9 V at 25.1 A - Clamping voltage during 10/1000 µs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 500 W - Peak pulse power handling capacity; supports high-energy transients like ISO 7637-2 Pulse 5a. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | SMA (DO-214AC) - Surface-mount package with 5.28 mm × 4.50 mm footprint and 2.29 mm height; compatible with standard SMT pick-and-place. |
Pinout & Package
SMA (DO-214AC) package: molded epoxy case meeting UL 94 V-0, matte tin-plated leads solderable per J-STD-002, no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (unmarked) | Bidirectional terminal pair | Both terminals function identically; no cathode band; symmetric clamping in either direction. |
| Case | Non-electrical mechanical interface | Plastic body provides insulation and mechanical mounting; no thermal or electrical connection to die. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC or floating lines without polarity concern; eliminates need for dual unidirectional devices. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and JEDEC JESD201 Class 2 whisker resistance requirements. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD, relay bounce), improving protection fidelity. |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting LIN or SENT bus sensors in engine bay against load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamping transient energy before it reaches the sensor ASIC or microcontroller input. Use Value: Maintains signal integrity during 12 V system surges up to 500 W; prevents latch-up or permanent damage to 5 V tolerant receivers. | Use Scenario: Shielding CANH/CANL differential pair in factory automation controllers from EFT and surge events. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed across differential lines to suppress common-mode transients. Use Value: Clamps to ≤19.9 V without distorting 1 Mbps CAN signaling; supports IEC 61000-4-4 Level 4 immunity testing. |
| Consumer Power Adapter Input | Telecom DSL Line Protection |
Use Scenario: Secondary-side DC input protection in wall adapters exposed to lightning-induced surges on AC mains. IC Role / Device Role / Timing Role: Final-stage TVS on 12 V output rail guarding downstream DC-DC converters and USB-PD controllers. Use Value: Absorbs 500 W pulses without degradation; complements upstream MOVs by handling faster rise-time events. | Use Scenario: Overvoltage protection on ADSL/VDSL line cards interfacing with outside plant wiring. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed between tip/ring and codec IC to shunt induced surges. Use Value: Withstands repeated 10/1000 µs surges up to 25.1 A while maintaining <1 μA leakage at 12 V - preserving line impedance and SNR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J12CAHE3_A/I | RoHS-compliant but not halogen-free; lacks JESD201 Class 2 whisker resistance certification. | Approved for commercial and industrial use; not rated for under-hood automotive due to material specification gap. | Select when halogen-free requirement is not mandated and cost optimization is prioritized. |
| SMA5J12CA-E3/61 | Same electrical specs; RoHS-compliant, non-halogen-free, commercial grade only; packaged in 7" tape (1800 pcs). | Intended for consumer electronics BOMs with no automotive qualification needs; no AEC-Q101 validation. | Choose for high-volume non-automotive production where AEC-Q101 and halogen-free status are unnecessary. |
Compared with SMA5J12CAHM3_A/I, the HE3_A/I variant omits halogen-free construction and whisker resistance, limiting automotive deployment, while the E3/61 version lacks both AEC-Q101 and halogen-free compliance-making SMA5J12CAHM3_A/I the only option fully aligned with Tier-1 automotive supply chain requirements.
Availability
SMA5J12CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial CAN networks, and telecom line card designs requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMA5J12CAHM3_A/I 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 density, and automotive-grade qualification.
The SMA5J series is engineered specifically for high-power-density transient suppression in space-constrained automotive and industrial systems, delivering 500 W surge capability in the compact SMA package while meeting AEC-Q101 stress test requirements.
FAQ
What is the clamping voltage of the SMA5J12CAHM3_A/I at its rated peak pulse current?
The SMA5J12CAHM3_A/I has a maximum clamping voltage (VC) of 19.9 V at its peak pulse current (IPPM) of 25.1 A under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and verified at TA = 25 °C on 5.0 mm × 5.0 mm copper pads. The SMA5J12CAHM3_A/I maintains this clamping performance across its qualified operating temperature range.
Is the SMA5J12CAHM3_A/I suitable for automotive applications?
Yes, the SMA5J12CAHM3_A/I is AEC-Q101 qualified and designated for automotive use, with ordering code suffix HM3 indicating halogen-free, RoHS-compliant, and AEC-Q101 validated construction. It is commonly deployed in engine control units, body control modules, and ADAS sensor interfaces where sustained operation at +150 °C and immunity to repetitive surge events are required. The SMA5J12CAHM3_A/I meets all stress tests defined in the AEC-Q101 standard.
Does the SMA5J12CAHM3_A/I have polarity markings?
No, the SMA5J12CAHM3_A/I does not have polarity markings because it is a bidirectional TVS diode. Unlike unidirectional variants (e.g., SMA5J12A), it lacks a cathode band and functions identically in both directions. This symmetry allows placement without orientation concerns on PCBs, simplifying layout and assembly for differential or AC-coupled signal paths.
What is the thermal resistance of the SMA5J12CAHM3_A/I?
The SMA5J12CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Its junction-to-lead thermal resistance (RθJL) is 25 °C/W. These values are critical for estimating temperature rise during repetitive surge events and ensuring long-term reliability within the +150 °C maximum junction temperature limit.
How does the SMA5J12CAHM3_A/I differ from the SMA5J12A variant?
The SMA5J12CAHM3_A/I is bidirectional with no polarity marking and symmetrical clamping, whereas the SMA5J12A is unidirectional and marked with a cathode band. Electrically, the SMA5J12CAHM3_A/I supports reverse and forward surge conduction, while SMA5J12A conducts only in reverse bias. Both share identical VWM (12 V), VBR (13.3–14.7 V), and PPPM (500 W), but the SMA5J12CAHM3_A/I is required for AC or floating-line protection scenarios.
SMA5J12CAHM3_A/I 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:
- 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)
SMA5J12CAHM3_A/I FAQ
1.How can I place an order for SMA5J12CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J12CAHM3_A/I 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 SMA5J12CAHM3_A/I reliable?
The price and inventory of SMA5J12CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J12CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMA5J12CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J12CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J12CAHM3_A/I?
SMA5J12CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J12CAHM3_A/I 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 SMA5J12CAHM3_A/I?
For technical support, including SMA5J12CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J12CAHM3_A/I requirements.
6.How does Aetrix verify that SMA5J12CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMA5J12CAHM3_A/I 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 SMA5J12CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMA5J12CAHM3_A/I?
All SMA5J12CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J12CAHM3_A/I, 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 SMA5J12CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMA5J12CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J12CAHM3_A/I Tags
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