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Vishay General Semiconductor - Diodes Division SMAJ12AHE3/61
- Part No.:
- SMAJ12AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ12AHE3/61.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,113
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Product details
Overview
SMAJ12AHE3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 19.9 V maximum clamping voltage (VC) at 20.1 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power rails.
For engineers reviewing the SMAJ12AHE3/61 datasheet, SMAJ12AHE3/61 pinout, SMAJ12AHE3/61 application, or SMAJ12AHE3/61 equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 1.0 μA max reverse leakage at VWM, 150 °C max junction temperature, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal bias it presents high impedance (>1 MΩ), but triggers into low-impedance conduction when transient voltage exceeds VBR, clamping the line to ≤19.9 V. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
Designed for single-polarity DC lines, SMAJ12AHE3/61 uses cathode-band marking for polarity identification and meets J-STD-020 MSL Level 1 with 260 °C reflow peak. It delivers 40 A non-repetitive forward surge capability (8.3 ms half-sine) and derates linearly above 25 °C ambient per Fig. 2 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before leakage exceeds 1.0 μA; defines safe DC rail margin. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above nominal 12 V supply. |
| VC @ IPPM | 19.9 V at 20.1 A - Clamped voltage during 10/1000 μs surge; limits stress on downstream 20 V-rated ICs. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 μs waveform; supports repetitive 0.01% duty cycle surges. |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms); protects against inductive switch-off spikes in motor drivers. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| RθJA | 120 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" pads; informs thermal layout requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode identified by black band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side of protected line (e.g., GND or return path). |
| Cathode | Current exit terminal during forward conduction; marked with band | Connected to higher-potential side (e.g., +12 V rail); reverse-biased during normal operation. |
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 | Clamps 10/1000 μs transients up to 20.1 A without failure - sufficient for ISO 7637-2 Pulse 1/2a/5a compliance. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage exposure to protected ICs; improves system-level ESD and surge immunity margin. |
| MSL Level 1, 260 °C peak reflow | Enables standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| Glass passivated junction | Ensures stable VBR over time and temperature; reduces parameter drift in harsh industrial environments. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and ground, triggered within <1 ps to clamp spikes above 13.3 V. Use Value: Limits voltage to ≤19.9 V during 400 W surges, preventing latch-up or gate oxide damage in microcontrollers and CAN transceivers. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to ADC inputs in factory automation PLCs. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) TVS on signal line to ground, suppressing ESD and switching noise without distorting mV-level signals. Use Value: 1.0 μA leakage at 12 V ensures minimal offset error; fast response preserves signal integrity during 8 kV contact ESD events. |
| DC Motor Driver Output Stage | Consumer Power Adapter Input Stage |
Use Scenario: Snubbing inductive kickback from brushed DC motors in automotive seat/mirror actuators. IC Role / Device Role / Timing Role: Mounted across H-bridge output terminals or between drain and source of MOSFETs to absorb flyback energy. Use Value: 40 A surge rating handles repeated 8.3 ms turn-off spikes; 150 °C rating sustains reliability near hot motor windings. |
Use Scenario: Secondary-side overvoltage suppression in 12 V wall adapters powering IoT hubs and smart speakers. IC Role / Device Role / Timing Role: Final-stage protection after rectification and filtering, guarding LDOs and USB controllers from AC-line transients. Use Value: RoHS-compliant and halogen-free (HE3 suffix) meets global regulatory requirements; 0.064 g unit weight supports compact PCB design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A-E3/61 | Commercial-grade (non-AEC-Q101), identical electrical specs and package. | Not qualified for automotive use; suitable for consumer/industrial where qualification not mandated. | Select when AEC-Q101 is unnecessary and cost optimization is prioritized. |
| SMAJ12CAHE3/61 | Bidirectional variant; symmetric VBR (13.3–14.7 V) in both polarities; same VC and PPPM. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal occurs. | Choose only if bidirectional protection is needed; unidirectional SMAJ12AHE3/61 offers lower leakage in DC systems. |
Compared with SMAJ12A-E3/61, SMAJ12AHE3/61 adds AEC-Q101 qualification for automotive deployment; compared with SMAJ12CAHE3/61, it provides lower reverse leakage and avoids unnecessary bidirectional conduction in fixed-polarity rails.
Availability
SMAJ12AHE3/61 is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, DC motor drives, and consumer power adapter designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ12AHE3/61 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade validation.
The SMAJ series is engineered for robust transient suppression in harsh environments, targeting automotive, industrial, and telecom power and signal line protection with standardized DO-214AC packaging and AEC-Q101 options.
FAQ
What is the clamping voltage of SMAJ12AHE3/61 at its rated peak pulse current?
The SMAJ12AHE3/61 has a maximum clamping voltage (VC) of 19.9 V at its rated peak pulse current (IPPM) of 20.1 A, measured using the standard 10/1000 μs waveform. This value is guaranteed per the Vishay datasheet revision 09-Jan-2024 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ12AHE3/61 maintains this clamping performance across its qualified operating temperature range.
Is SMAJ12AHE3/61 suitable for automotive applications?
Yes, SMAJ12AHE3/61 is AEC-Q101 qualified, making it suitable for automotive applications including engine control modules, body electronics, and infotainment power supplies. The "HE3" suffix explicitly denotes RoHS-compliant and AEC-Q101 qualified construction. Its 150 °C maximum junction temperature, MSL Level 1 reflow rating, and validated surge performance meet automotive environmental and reliability requirements. SMAJ12AHE3/61 is specified for use in such systems per Vishay's official documentation.
What does the "HE3" suffix mean in SMAJ12AHE3/61?
The "HE3" suffix in SMAJ12AHE3/61 indicates RoHS-compliant construction with AEC-Q101 qualification. "H" denotes AEC-Q101 qualification, "E3" confirms RoHS compliance and commercial-grade temperature rating (−55 °C to +150 °C). This distinguishes it from base "E3" (RoHS, non-automotive) and "HM3" (halogen-free + AEC-Q101) variants. The SMAJ12AHE3/61 thus combines automotive reliability with environmental compliance in a single part number.
How does SMAJ12AHE3/61 differ from SMAJ12CAHE3/61?
SMAJ12AHE3/61 is unidirectional, with cathode-band marking and conduction only in reverse bias, while SMAJ12CAHE3/61 is bidirectional - symmetrical in both polarities with no polarity marking. Both share identical VBR, VC, and PPPM, but SMAJ12AHE3/61 exhibits lower reverse leakage (1.0 μA vs. doubled limit for low-VWM bidirectionals). Use SMAJ12AHE3/61 for fixed-polarity DC rails; choose SMAJ12CAHE3/61 only for AC or polarity-agnostic lines like CAN or RS-485.
What PCB pad layout is recommended for optimal thermal and surge performance of SMAJ12AHE3/61?
Vishay specifies mounting SMAJ12AHE3/61 on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 400 W peak pulse power and 120 °C/W thermal resistance. Smaller pads reduce surge capability and increase junction temperature. The SMA (DO-214AC) footprint must follow Vishay's recommended outline (Document 88390, page 5), including 0.074" max height and 0.066" min cathode band clearance. Proper pad sizing ensures SMAJ12AHE3/61 meets its published electrical and thermal specifications.
SMAJ12AHE3/61 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ12AHE3/61 FAQ
1.How can I place an order for SMAJ12AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ12AHE3/61 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 SMAJ12AHE3/61 reliable?
The price and inventory of SMAJ12AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ12AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ12AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ12AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ12AHE3/61?
SMAJ12AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ12AHE3/61 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 SMAJ12AHE3/61?
For technical support, including SMAJ12AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ12AHE3/61 requirements.
6.How does Aetrix verify that SMAJ12AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ12AHE3/61 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 SMAJ12AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ12AHE3/61?
All SMAJ12AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ12AHE3/61, 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 SMAJ12AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ12AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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