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Vishay General Semiconductor - Diodes Division SMAJ36AHM3/I
- Part No.:
- SMAJ36AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ36AHM3/I.pdf
- Description:
- TVS DIODE 36VWM 58.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,691
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Product details
Overview
SMAJ36AHM3/I 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, and clamps transients to ≤58.1 V at 6.9 A peak pulse current (IPPM) under 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial I/O modules.
For engineers reviewing the SMAJ36AHM3/I datasheet, SMAJ36AHM3/I pinout, SMAJ36AHM3/I application, or SMAJ36AHM3/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), junction temperature range (−55 to +150 °C), and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker test.
Technical Context
This unidirectional TVS diode operates as a clamping device in reverse-biased configuration, responding to voltage surges exceeding its VWM with sub-nanosecond avalanche breakdown. Its glass-passivated junction ensures stable leakage (<1.0 μA at 36 V) and repeatable clamping performance across temperature.
Rated for 400 W peak pulse power (10/1000 μs), it delivers 6.9 A IPPM with low incremental surge resistance and meets MSL Level 1 (260 °C reflow). The SMA package supports automated placement and provides RθJL = 30 °C/W for effective lead-to-junction heat transfer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 40.0 V / 44.2 V at 1 mA - guaranteed avalanche onset window defining protection threshold tolerance |
| VC @ IPPM | ≤58.1 V at 6.9 A - clamped voltage during 10/1000 μs surge, limiting stress on downstream ICs |
| PPPM | 400 W - peak transient energy absorption capability without failure under standard waveform |
| IFSM | 40 A - surge current rating for 8.3 ms half-sine wave, supporting inrush and load-dump events |
| TJ range | −55 °C to +150 °C - operational junction temperature span enabling use in under-hood automotive environments |
| RθJA | 120 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Cathode indicated by band; polarity critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to circuit ground or lower-potential rail; defines clamping reference point |
| Cathode | Avalanche conduction terminal / Surge current sink | Connected to protected line (e.g., 36 V supply); conducts surge current to ground during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for global automotive and industrial OEMs |
| 400 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surge events without degradation |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during fast transients, protecting 3.3 V/5 V logic and MOSFET gate drivers |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning or dry-pack requirements |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 36 V battery-fed microcontroller power inputs in vehicle body control modules against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between VIN and GND, conducting only during positive overvoltage events. Use Value: Limits transient voltage to ≤58.1 V, preventing latch-up or oxide breakdown in 40 V-rated LDOs and MCU power domains. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation PLCs from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Standoff-mode protector on signal path, remaining non-conductive below 36 V while clamping fast spikes. Use Value: Maintains signal integrity with <1.0 μA leakage at 36 V and responds within <1 ns to 8 kV ESD per IEC 61000-4-2. |
| Telecom DC Power Interface | Consumer Device USB Power Input |
|
Use Scenario: Safeguarding PoE-powered network switches' 48 V input stage from lightning-induced surges on outdoor Ethernet runs. IC Role / Device Role / Timing Role: Primary front-end TVS on DC input rail, coordinated with upstream MOVs and secondary filtering. Use Value: Absorbs 400 W transient energy per event with 120 °C/W thermal resistance, enabling reliable operation without derating at 70 °C ambient. |
Use Scenario: Overvoltage suppression on USB-C PD 20 V input rails in portable medical monitors exposed to accidental adapter mismatches. IC Role / Device Role / Timing Role: Secondary-level clamp after primary fuse and common-mode choke, targeting fast differential transients. Use Value: Clamps 20 V surges to <58.1 V within nanoseconds, preserving 24 V-rated buck converters and USB interface ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36AHE3/I | Same electrical specs but RoHS-compliant (non-halogen-free) construction; no JESD201 Class 2 whisker test certification | Suitable for commercial/industrial designs where halogen-free mandate is not enforced | Select when cost sensitivity outweighs automotive or green-material requirements |
| SMAJ36A-M3/5A | Identical halogen-free formulation and AEC-Q101 qualification, but supplied in 13" tape-and-reel (7500 pcs) vs. 7" reel (1800 pcs) | Optimized for high-volume SMT production lines requiring larger reels and automated feeder compatibility | Choose for volume manufacturing with compatible pick-and-place equipment |
Compared with SMAJ36AHM3/I, SMAJ36AHE3/I lacks halogen-free compliance and whisker resistance, while SMAJ36A-M3/5A offers identical performance in a higher-volume packaging format - both require no PCB redesign but differ in supply chain and compliance alignment.
Availability
SMAJ36AHM3/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom power system prototyping requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for SMAJ36AHM3/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, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMAJ series was engineered specifically for board-level transient suppression in harsh environments - delivering consistent clamping, low leakage, and AEC-Q101 validation for automotive, industrial, and infrastructure applications.
FAQ
What is the clamping voltage of SMAJ36AHM3/I at its rated peak pulse current?
The SMAJ36AHM3/I clamps to a maximum of 58.1 V at its specified peak pulse current of 6.9 A under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, ensuring predictable overvoltage limiting for downstream components in circuits protected by SMAJ36AHM3/I.
Is SMAJ36AHM3/I qualified for automotive applications?
Yes, SMAJ36AHM3/I carries AEC-Q101 qualification, as indicated by the "HM3" suffix and documented in Vishay's ordering information table. It is certified for use in automotive subsystems including body electronics, infotainment power supplies, and sensor interfaces where reliability under temperature cycling, vibration, and surge stress is mandatory - a key differentiator of SMAJ36AHM3/I versus commercial-grade variants.
What does the "HM3" suffix signify in SMAJ36AHM3/I?
The "HM3" suffix in SMAJ36AHM3/I denotes halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance requirements, plus AEC-Q101 qualification. This distinguishes SMAJ36AHM3/I from "E3" (RoHS only) and "HE3" (AEC-Q101 + RoHS, non-halogen-free) variants - confirming SMAJ36AHM3/I satisfies stringent environmental and reliability mandates for modern automotive and industrial deployments.
Can SMAJ36AHM3/I be used in bidirectional configurations?
No, SMAJ36AHM3/I is a unidirectional TVS diode, as confirmed by its part number suffix "A" (not "CA") and polarity marking (cathode band). Bidirectional operation requires the "CA" variant (e.g., SMAJ36CA), which exhibits symmetrical clamping in both directions. Using SMAJ36AHM3/I in bidirectional circuits would result in forward conduction during negative transients, potentially damaging the device or failing to protect - a critical design constraint for SMAJ36AHM3/I.
What is the thermal resistance junction-to-ambient for SMAJ36AHM3/I?
The typical junction-to-ambient thermal resistance (RθJA) for SMAJ36AHM3/I is 120 °C/W, measured on a standard 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad layout per JEDEC standards. This value directly impacts power derating above 25 °C ambient and must be applied when calculating safe operating area in high-temperature environments such as engine compartments - a verified parameter for SMAJ36AHM3/I in Vishay's thermal characteristics table.
SMAJ36AHM3/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:
- 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/I FAQ
1.How can I place an order for SMAJ36AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ36AHM3/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/I reliable?
The price and inventory of SMAJ36AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMAJ36AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ36AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ36AHM3/I?
SMAJ36AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ36AHM3/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/I?
For technical support, including SMAJ36AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ36AHM3/I requirements.
6.How does Aetrix verify that SMAJ36AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ36AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMAJ36AHM3/I?
All SMAJ36AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ36AHM3/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/I part is unused and in its original packaging.
Return procedure for SMAJ36AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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