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Vishay General Semiconductor - Diodes Division SMAJ12CAHE3/61
- Part No.:
- SMAJ12CAHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ12CAHE3/61.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,879
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Product details
Overview
SMAJ12CAHE3/61 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 12 V stand-off voltage (VWM), 19.9 V maximum clamping voltage (VC) at 20.1 A peak pulse current (IPPM), and 400 W peak pulse power (PPPM) with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems.
For engineers reviewing the SMAJ12CAHE3/61 datasheet, SMAJ12CAHE3/61 pinout, SMAJ12CAHE3/61 application, or SMAJ12CAHE3/61 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM ≈ 1.66), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown behavior in both directions due to its bidirectional construction. Its glass-passivated junction enables fast response time (<1 ns) and low incremental surge resistance, critical for suppressing ESD and inductive switching spikes.
The SMAJ12CAHE3/61 delivers stable clamping performance across -55 °C to +150 °C junction temperature range, with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W. It meets UL 497B recognition (QVGQ2) and is rated for repetitive 0.01% duty cycle surges under defined mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin. |
| VBR min/max | 13.3 V / 14.7 V at 1 mA - Verified breakdown threshold ensures reliable turn-on during overvoltage events. |
| VC @ IPPM | 19.9 V at 20.1 A - Clamping voltage under 10/1000 μs surge; limits downstream component stress to safe levels. |
| PPPM | 400 W - Peak transient energy absorption capacity; sufficient for automotive load-dump and ISO 7637-2 pulse 1/2a/5a protection. |
| ID @ VWM | 1.0 μA - Ultra-low leakage at stand-off voltage preserves signal integrity and battery life in always-on circuits. |
| TJ max | +150 °C - Enables use in under-hood automotive environments and high-temperature industrial enclosures. |
| MSL Level | Level 1 per J-STD-020 - Supports standard reflow without baking; compatible with high-volume SMT assembly. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); matte tin-plated leads, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts surge current from either direction; connects to protected line (e.g., CAN_H or LIN bus). |
| Cathode | Transient current entry (bidirectional) | Completes low-impedance path to ground during clamping; shares same electrical role as Anode in CA devices. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress test requirements. |
| 400 W peak pulse power | Handles ISO 7637-2 Pulse 5a (load dump up to 60 V, 100 ms) when mounted on 5.0 mm × 5.0 mm copper pads. |
| Clamping ratio VC/VWM = 1.66 | Minimizes overvoltage exposure to downstream ICs - e.g., keeps 12 V supply rail below 20 V during transients. |
| Low leakage ID ≤ 1.0 μA | Prevents measurable current drain in battery-backed sensor nodes and low-power IoT edge devices. |
| UL 497B recognized (QVGQ2) | Meets safety standards for telecom and industrial signal line protectors; simplifies end-equipment certification. |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Protection |
|---|---|
|
Use Scenario: Protecting LIN bus lines from load dump and ESD in door module ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between LIN transceiver and connector interface. Use Value: Limits transient voltage to ≤19.9 V, preventing damage to TI SN65HVDA100 or ST TLE7250 LIN ICs. |
Use Scenario: Shielding 4–20 mA current loop inputs in PLC analog input modules from field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage shunt on signal line upstream of op-amp conditioning stage. Use Value: Absorbs 400 W surges without degradation, maintaining <1 μA leakage to preserve loop accuracy. |
| Telecom Power Interface | Consumer Appliance Motor Drive |
|
Use Scenario: Safeguarding PoE-powered Ethernet PHY interfaces against induced lightning surges. IC Role / Device Role / Timing Role: Secondary-level TVS on DC bias line feeding isolated Ethernet magnetics. Use Value: Fast sub-ns response clamps common-mode transients before they couple into transformer windings. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home vacuum cleaners. IC Role / Device Role / Timing Role: Across-motor terminals to clamp inductive kickback seen by H-bridge MOSFETs. Use Value: Withstands 40 A IFSM surge and maintains 12 V VWM margin against 24 V nominal supply rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12CA-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free compliance is mandated by OEM material declarations. | Choose SMAJ12CAHE3/61 for standard AEC-Q101 automotive use; select SMAJ12CA-M3/61 only if halogen-free content is contractually required. |
| SMBJ12CAHE3/61 | Same VWM/VC/PPPM but in larger SMB (DO-214AA) package; higher thermal mass, RθJA = 80 °C/W. | Better power handling under sustained surge conditions; requires larger PCB footprint (5.28 mm × 4.50 mm vs. 4.93 mm × 3.99 mm). | Use SMBJ12CAHE3/61 where board space allows and thermal derating margin is critical; retain SMAJ12CAHE3/61 for compact, high-density layouts. |
Compared with SMAJ12CA-M3/61, the SMAJ12CAHE3/61 offers identical protection performance with standard RoHS compliance; versus SMBJ12CAHE3/61, it trades thermal margin for 25% smaller footprint - making it optimal for space-constrained automotive and portable industrial designs.
Availability
SMAJ12CAHE3/61 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, telecom power circuits, and consumer appliance motor drives requiring stable component supply and AEC-Q101 assurance.
Supply support for SMAJ12CAHE3/61 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 and automotive-grade qualification.
The SMAJ series targets cost-effective, high-reliability transient suppression in space-constrained surface-mount applications - especially where AEC-Q101 compliance, low clamping voltage, and automated assembly are mandatory.
FAQ
What is the clamping voltage of SMAJ12CAHE3/61 under a 10/1000 μs surge?
The SMAJ12CAHE3/61 has a maximum clamping voltage (VC) of 19.9 V at 20.1 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88390 and defines the upper voltage limit imposed on protected circuitry during standardized transient events. The SMAJ12CAHE3/61 maintains this clamping performance across its full operating temperature range.
Is SMAJ12CAHE3/61 suitable for automotive applications?
Yes, SMAJ12CAHE3/61 is AEC-Q101 qualified and explicitly designated for automotive use via the "HE3" suffix. It supports under-hood and cabin applications including body control modules, LIN/CAN interface protection, and motor driver circuits. Its -55 °C to +150 °C operating range, MSL Level 1 rating, and UL 497B recognition confirm suitability for automotive-grade production.
How does SMAJ12CAHE3/61 differ from unidirectional SMAJ12AHE3/61?
The SMAJ12CAHE3/61 is bidirectional with symmetrical clamping in both polarities and no cathode band marking, while SMAJ12AHE3/61 is unidirectional with a visible cathode band and forward conduction capability. Their VWM (12 V), VC (19.9 V), and PPPM (400 W) are identical, but SMAJ12CAHE3/61 must be used where AC-coupled or dual-polarity signal lines require protection - such as differential buses or transformer-isolated interfaces.
What is the leakage current specification for SMAJ12CAHE3/61 at its stand-off voltage?
SMAJ12CAHE3/61 exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 12 V stand-off voltage (VWM), tested at TA = 25 °C. This ultra-low leakage ensures minimal impact on battery-powered systems and precision analog circuits. The value remains within specification up to TJ = 125 °C, with gradual increase per thermal derating curves in the datasheet.
Does SMAJ12CAHE3/61 require special PCB layout considerations?
Yes - Vishay specifies that the 400 W peak pulse rating assumes mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Reducing pad size lowers thermal dissipation and reduces achievable PPPM. For optimal clamping performance, minimize trace inductance between SMAJ12CAHE3/61 and protected node, and avoid vias in the main surge current path. The SMAJ12CAHE3/61 datasheet provides exact pad dimensions in inches/mm on page 5.
SMAJ12CAHE3/61 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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 20.1A
- 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)
SMAJ12CAHE3/61 FAQ
1.How can I place an order for SMAJ12CAHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ12CAHE3/61 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 SMAJ12CAHE3/61 reliable?
The price and inventory of SMAJ12CAHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ12CAHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ12CAHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ12CAHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ12CAHE3/61?
SMAJ12CAHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ12CAHE3/61 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 SMAJ12CAHE3/61?
For technical support, including SMAJ12CAHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ12CAHE3/61 requirements.
6.How does Aetrix verify that SMAJ12CAHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ12CAHE3/61 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 SMAJ12CAHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ12CAHE3/61?
All SMAJ12CAHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ12CAHE3/61, 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 SMAJ12CAHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ12CAHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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