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Vishay General Semiconductor - Diodes Division SMAJ36AHM3_A/I
- Part No.:
- SMAJ36AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ36AHM3_A/I.pdf
- Description:
- TVS DIODE 36VWM 58.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,725
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Product details
Overview
SMAJ36AHM3_A/I 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 36 V standoff voltage (VWM), 40.0–44.2 V breakdown voltage (VBR) at 1 mA, 58.1 V maximum clamping voltage (VC) at 6.9 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 SMAJ36AHM3_A/I datasheet, SMAJ36AHM3_A/I pinout, SMAJ36AHM3_A/I application, or SMAJ36AHM3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 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 conditions it presents high impedance (>1 μA leakage at 36 V), but triggers into low-impedance conduction when transient voltage exceeds its 40.0–44.2 V breakdown range. Its glass-passivated junction ensures stable VBR tolerance and low incremental surge resistance.
Designed for single-polarity DC line protection, SMAJ36AHM3_A/I delivers 58.1 V clamping at 6.9 A (10/1000 μs), with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling reliable operation up to 150 °C junction temperature in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36 V - Maximum continuous reverse operating voltage before significant leakage begins |
| VBR (min/max) | 40.0 V / 44.2 V at 1 mA - Confirmed breakdown threshold range defining turn-on consistency |
| VC @ IPPM | 58.1 V at 6.9 A - Clamped voltage during 10/1000 μs surge, limiting stress on downstream components |
| PPPM | 400 W - Peak pulse power handling capability under standard transient waveform |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms), supporting inrush and fault-current events |
| TJ max | +150 °C - Maximum junction temperature enabling use in under-hood automotive and industrial environments |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 0.208" x 0.157" footprint and matte tin-plated leads |
Pinout & Package
Package: SMA (DO-214AC), molded epoxy case meeting UL 94 V-0 flammability rating; cathode indicated by band on one end; terminals are matte tin-plated and solderable per J-STD-002/JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or lowest potential node in unidirectional clamp configuration |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 36 V rail); band-marked end accepts positive surge relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards |
| Halogen-free & RoHS-compliant | HM3 suffix confirms full compliance with environmental regulations without compromising surge robustness |
| 400 W peak pulse power | Handles high-energy transients common in 24 V/36 V vehicle electrical systems and industrial motor drives |
| Fast response time | Sub-nanosecond clamping enables protection of sensitive CMOS inputs and gate drivers before damage occurs |
| Low incremental surge resistance | Minimizes VC overshoot during high di/dt events, improving margin for downstream 40 V-rated components |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load-dump and jump-start transients on 24 V/36 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and ground, triggered only during overvoltage events. Use Value: Limits rail voltage to ≤58.1 V during 6.9 A surges, protecting 40 V-rated DC-DC converters and microcontrollers. | Use Scenario: Guarding analog front-end inputs of pressure/temperature sensors connected to long harnesses in factory automation. IC Role / Device Role / Timing Role: Standoff-mode protector on sensor supply and signal lines, activated only during ESD or inductive switching spikes. Use Value: Maintains <1 μA leakage at 36 V, preserving sensor accuracy while clamping 1 kV ESD pulses to safe levels. |
| Motor Drive Gate Driver Protection | Telecom DC Power Input Protection |
Use Scenario: Shielding high-side N-channel MOSFET gate drivers from Miller-induced voltage spikes during switching transitions. IC Role / Device Role / Timing Role: Fast-clamping TVS across driver output and ground, absorbing sub-100 ns ringing energy. Use Value: Sub-ns response prevents false turn-on of power FETs; 58.1 V clamping avoids exceeding gate oxide limits. | Use Scenario: Safeguarding -48 V telecom rectifier outputs against lightning-induced surges entering via outdoor cabling. IC Role / Device Role / Timing Role: Primary-level unidirectional suppressor on DC input bus prior to upstream filtering and regulation. Use Value: Withstands repetitive 400 W surges at 0.01% duty cycle, ensuring longevity in central office power systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36AHE3_A/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Suitable for commercial/industrial use where automotive reliability is not required | Select when halogen-free content and automotive qualification are not mandated |
| SMBJ36A-HM3_A/I | Same VWM/VC, but SMB package (DO-214AA); 600 W PPPM; higher thermal mass | Better suited for higher-energy transients or elevated ambient temperatures due to larger footprint | Choose when board space allows larger package and higher surge margin is needed |
Compared with SMAJ36AHM3_A/I, SMAJ36AHE3_A/I offers identical clamping performance without halogen-free or automotive qualification, while SMBJ36A-HM3_A/I provides 50% higher peak power in a larger SMB package - enabling trade-offs between PCB area, surge margin, and compliance requirements.
Availability
SMAJ36AHM3_A/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and telecom DC input hardening requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ36AHM3_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 and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, AEC-Q101 validation, and halogen-free compliance are mandatory.
FAQ
What is the clamping voltage of the SMAJ36AHM3_A/I under a 10/1000 μs surge?
The SMAJ36AHM3_A/I has a maximum clamping voltage (VC) of 58.1 V at 6.9 A peak pulse current under the standardized 10/1000 μs waveform. This value is measured per Fig. 1 in the Vishay datasheet 88390 and defines the upper voltage limit imposed on protected circuits during surge events. The SMAJ36AHM3_A/I maintains this clamping performance across its rated temperature range and supports repeatable operation at 0.01% duty cycle.
Is SMAJ36AHM3_A/I qualified for automotive applications?
Yes, SMAJ36AHM3_A/I is AEC-Q101 qualified, as confirmed by the HM3 suffix and documentation in Vishay's datasheet 88390. This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD robustness - making SMAJ36AHM3_A/I suitable for under-hood and chassis-mounted automotive electronics where reliability under thermal and mechanical stress is critical.
What does the "HM3" suffix indicate in SMAJ36AHM3_A/I?
The "HM3" suffix in SMAJ36AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information table, HM3 parts meet JESD201 Class 2 whisker resistance, use matte tin-plated leads, and are supplied in 13" tape-and-reel (I-pack) format - distinguishing them from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS, non-halogen-free) variants.
How does SMAJ36AHM3_A/I differ from bidirectional SMAJ36CA variants?
SMAJ36AHM3_A/I is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse voltage is blocked. In contrast, SMAJ36CA is bidirectional, symmetrical in both directions, and used in AC-coupled or floating signal paths. Their VBR, VC, and PPPM values are identical, but SMAJ36AHM3_A/I cannot replace SMAJ36CA in AC applications without circuit redesign.
What PCB pad layout is recommended for optimal thermal performance of SMAJ36AHM3_A/I?
Vishay specifies mounting SMAJ36AHM3_A/I on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 400 W peak pulse power. Smaller pads reduce heat dissipation and derate power capability - for example, Fig. 2 shows >20% reduction in allowable pulse power above 25 °C ambient when using minimal copper. Thermal vias under pads further improve junction-to-board conduction.
SMAJ36AHM3_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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 36V
- Voltage - Breakdown (Min):
- 40V
- Voltage - Clamping (Max) @ Ipp:
- 58.1V
- Current - Peak Pulse (10/1000µs):
- 6.9A
- Power - Peak Pulse:
- 400W
- 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)
SMAJ36AHM3_A/I FAQ
1.How can I place an order for SMAJ36AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ36AHM3_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 SMAJ36AHM3_A/I reliable?
The price and inventory of SMAJ36AHM3_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 SMAJ36AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ36AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ36AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ36AHM3_A/I?
SMAJ36AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ36AHM3_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 SMAJ36AHM3_A/I?
For technical support, including SMAJ36AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ36AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ36AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ36AHM3_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 SMAJ36AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ36AHM3_A/I?
All SMAJ36AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ36AHM3_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 SMAJ36AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ36AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ36AHM3_A/I Tags
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