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Vishay General Semiconductor - Diodes Division SMAJ36AHM3/H
- Part No.:
- SMAJ36AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ36AHM3/H.pdf
- Description:
- TVS DIODE 36VWM 58.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,051
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Product details
Overview
SMAJ36AHM3/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. 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 safeguard MOSFETs, ICs, and sensor signal lines in automotive and industrial power rails.
For engineers reviewing the SMAJ36AHM3/H datasheet, SMAJ36AHM3/H pinout, SMAJ36AHM3/H application, or SMAJ36AHM3/H equivalent, key selection criteria include its AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on standard PCB copper pads.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (<1 μA leakage at 36 V), but triggers into low-impedance conduction when transients exceed VBR, clamping the line to ≤58.1 V. Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1 ns), critical for suppressing ESD and inductive switching spikes.
The device is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine), supports 0.01 % duty cycle repetitive operation, and exhibits a +0.100 %/°C temperature coefficient of VBR. Thermal resistance is 120 °C/W (junction-to-ambient) on 0.2" × 0.2" copper pads - requiring careful thermal layout for sustained surge events.
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 - defines reliable turn-on threshold across temperature and unit variation |
| VC @ IPPM | 58.1 V at 6.9 A - clamping voltage during 10/1000 μs surge, limiting stress on downstream components |
| PPPM | 400 W - peak pulse power handling capability under standardized transient waveform |
| IFSM | 40 A - single half-sine surge current rating, critical for motor driver and relay coil suppression |
| TJ max | +150 °C - enables operation in under-hood automotive and industrial environments |
| Package | SMA (DO-214AC) - surface-mount footprint compatible with JEDEC-standard reflow profiles |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 (260 °C peak reflow), UL 94 V-0 rated compound. Polarity indicated by cathode band; anode and cathode terminals are axially oriented along the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Protected line connection point | Connected to the circuit node requiring clamping; conducts surge current to ground when VIN > VBR |
| Anode | Reference/ground return | Typically tied to system ground or low-impedance return path; completes shunt path during transient event |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 |
| Halogen-free & RoHS-compliant | Meets global environmental regulations without compromising surge performance or solderability |
| 400 W peak pulse power (10/1000 μs) | Handles typical ISO 7637-2 pulse 1/2/5a/b surges in 12 V vehicle systems without degradation |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in protected MOSFETs |
| Fast response time (<1 ns) | Engages before most microsecond-scale transients fully develop, preserving signal integrity on data lines |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground. Use Value: Clamps transients to ≤58.1 V within nanoseconds, preventing damage to 36 V-rated CAN transceivers and microcontrollers. | Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loops) from ESD and field wiring faults. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted at connector entry point, referenced to signal ground. Use Value: Sub-1 μA leakage at 36 V avoids loading precision current sources; 58.1 V clamping preserves op-amp input stage integrity. |
| Consumer Power Adapter Input Stage | MOSFET Gate Driver Protection |
Use Scenario: Safeguarding AC-DC adapter primary-side controllers from lightning-induced surges on mains input. IC Role / Device Role / Timing Role: TVS connected across bridge rectifier output, clamping DC bus overvoltage. Use Value: 400 W rating absorbs IEC 61000-4-5 combination wave energy; 150 °C TJ rating supports compact, thermally constrained designs. | Use Scenario: Preventing gate oxide rupture in high-side N-channel MOSFETs driven by PWM controllers. IC Role / Device Role / Timing Role: TVS placed between gate and source, absorbing Miller-induced voltage spikes during switching. Use Value: 58.1 V clamping limits VGS stress below 60 V rating of common logic-level MOSFETs, extending lifetime in motor drives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36AHE3/H | Same electrical specs; RoHS-compliant but not halogen-free; no AEC-Q101 qualification | Approved for commercial/industrial use only; unsuitable for automotive production | Select when halogen-free content or automotive qualification is not required |
| SMBJ36A-H | Higher 600 W PPPM; larger SMB (DO-214AA) package; 64.5 V VC at 9.7 A | Better suited for higher-energy surges; requires larger PCB footprint and different pad layout | Choose when system-level surge testing exceeds 400 W requirements and board space permits SMB |
Compared with SMAJ36AHM3/H, SMAJ36AHE3/H lacks halogen-free and AEC-Q101 credentials but matches all electrical parameters, while SMBJ36A-H trades smaller size for higher surge capacity and looser clamping - making SMAJ36AHM3/H optimal for space-constrained, automotive-qualified 400 W protection.
Availability
SMAJ36AHM3/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, consumer power adapters, and MOSFET gate protection circuits requiring stable component supply and full traceability.
Supply support for SMAJ36AHM3/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 reliability, efficiency, and application-specific optimization.
The SMAJ series targets cost-sensitive, high-volume transient suppression needs in automotive, industrial, and consumer systems - engineered for rapid response, repeatable clamping, and seamless integration into automated SMT assembly lines.
FAQ
What does the 'HM3' suffix indicate in SMAJ36AHM3/H?
The HM3 suffix in SMAJ36AHM3/H denotes halogen-free, RoHS-compliant construction and AEC-Q101 qualification - confirming the device meets automotive-grade reliability standards including temperature cycling, highly accelerated life testing, and ESD immunity. This distinguishes SMAJ36AHM3/H from commercial-grade variants like SMAJ36A-E3/H and ensures suitability for under-hood and safety-critical vehicle subsystems.
Can SMAJ36AHM3/H be used in bidirectional protection applications?
No, SMAJ36AHM3/H is strictly unidirectional and must be installed with correct polarity (cathode toward the protected line). For bidirectional protection, Vishay offers the SMAJ36CA variant - which has symmetrical breakdown in both directions and no polarity marking. Using SMAJ36AHM3/H in reverse-biased configurations risks permanent failure due to lack of reverse avalanche capability.
What is the maximum clamping voltage of SMAJ36AHM3/H under surge conditions?
The maximum clamping voltage of SMAJ36AHM3/H is 58.1 V, measured at 6.9 A peak pulse current with a 10/1000 μs waveform. This value represents the upper limit of voltage seen by downstream components during worst-case transient events and is guaranteed across temperature and process variation per Vishay's datasheet specification 88390.
How does SMAJ36AHM3/H compare to SMAJ33A or SMAJ40A in system design?
SMAJ36AHM3/H provides tighter alignment with 36 V nominal systems (e.g., 24 V automotive with tolerance margin) versus SMAJ33A (33 V VWM) or SMAJ40A (40 V VWM). Its 36 V standoff avoids unnecessary leakage in 36 V rails while offering higher margin than SMAJ33A against slow-rising overvoltages - and lower clamping than SMAJ40A, improving protection headroom for 40 V-rated components.
Is thermal derating required for SMAJ36AHM3/H in high-temperature environments?
Yes - SMAJ36AHM3/H must be thermally derated above 25 °C ambient. Its 400 W peak pulse power rating assumes TA = 25 °C and 0.2" × 0.2" copper pads; power capability drops linearly per Figure 2 in datasheet 88390, reaching ~240 W at 75 °C ambient. Designers must verify junction temperature stays ≤150 °C using RθJA = 120 °C/W and expected surge repetition rate.
SMAJ36AHM3/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:
- Discontinued at Digi-Key
- 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/H FAQ
1.How can I place an order for SMAJ36AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ36AHM3/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 SMAJ36AHM3/H reliable?
The price and inventory of SMAJ36AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ36AHM3/H is usually 5 days.
3.What payment methods are accepted for SMAJ36AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ36AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ36AHM3/H?
SMAJ36AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ36AHM3/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 SMAJ36AHM3/H?
For technical support, including SMAJ36AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ36AHM3/H requirements.
6.How does Aetrix verify that SMAJ36AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ36AHM3/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 SMAJ36AHM3/H meets industry standards.
7.What is the process for return or replacement of SMAJ36AHM3/H?
All SMAJ36AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ36AHM3/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 SMAJ36AHM3/H part is unused and in its original packaging.
Return procedure for SMAJ36AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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