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Vishay General Semiconductor - Diodes Division SMAJ36AHE3_A/I
- Part No.:
- SMAJ36AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ36AHE3_A/I.pdf
- Description:
- TVS DIODE 36VWM 58.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,487
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Product details
Overview
SMAJ36AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping fast-rising voltage transients on power and signal lines. It features a 36 V stand-off 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 supplies.
For engineers reviewing the SMAJ36AHE3_A/I datasheet, SMAJ36AHE3_A/I pinout, SMAJ36AHE3_A/I application, or SMAJ36AHE3_A/I equivalent, this part delivers AEC-Q101 qualification, low incremental surge resistance, and MSL Level 1 moisture sensitivity - critical for high-reliability board-level ESD and load-switching surge protection in production-grade automotive ECUs and industrial controllers.
Technical Context
The SMAJ36AHE3_A/I operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified VBR range (40.0–44.2 V), with cathode band marking polarity. Its clamping action limits transient-induced overvoltage to ≤58.1 V at 6.9 A, enabling robust protection of 3.3 V/5 V/12 V logic and power rails without latch-up or thermal runaway.
Thermal performance is defined by RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and TJ(max) = +150 °C, supporting continuous operation in ambient temperatures up to +85 °C when derated per Fig. 2. It meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability requirements for PCB-mounted safety-critical suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC/AC working margin for 36 V nominal systems. |
| VBR (min/max) | 40.0 V / 44.2 V at 1 mA - Confirmed breakdown threshold ensures predictable turn-on during transients without premature leakage. |
| VC @ IPPM | 58.1 V at 6.9 A - Clamped voltage under 10/1000 μs surge; guarantees downstream ICs see <58.1 V even during 400 W transient events. |
| PPPM | 400 W - Peak pulse power handling capability with 0.01% duty cycle; supports repetitive surge immunity in motor drive and relay switching. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); enables compatibility with high-energy inductive kickback events. |
| TJ(max) | +150 °C - Maximum junction temperature; allows operation in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 0.208" × 0.157" footprint; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on unidirectional devices. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per datasheet Fig. 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to system ground or low-side return path; establishes reference for clamping action during positive transients. |
| Cathode | Clamping output / Transient sink node | Connected to protected line (e.g., 36 V rail); conducts surge current into ground when VAK > VBR, limiting voltage to ≤58.1 V. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors - supports PPAP and long-term reliability requirements. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients from relay coil de-energization or inductive load switching without degradation over 1000+ cycles. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on protected ICs - e.g., keeps 36 V rail transients below 58.1 V while maintaining >4 V design margin. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow assembly without popcorn cracking or delamination - no pre-baking required. |
| Glass passivated junction | Ensures stable leakage (<1.0 μA at VWM) and consistent VBR across temperature (-55 °C to +150 °C). |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface 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 TVS clamping device placed between 36 V rail and chassis ground, activated within <1 ns of overvoltage event. Use Value: Limits transient voltage to ≤58.1 V, preventing damage to 40 V-rated LDOs and MCU VDD pins while sustaining 400 W surges per ISO 7637-2 Pulse 5a. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure/temperature transmitters from ESD and field wiring faults. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected across signal and return lines, absorbing ±8 kV contact ESD per IEC 61000-4-2. Use Value: Maintains signal integrity with <1.0 μA leakage at 36 V, avoids loading precision DACs or op-amps, and clamps to <58.1 V without latch-up. |
| DC-DC Converter Input Protection | MOSFET Gate Driver Transient Suppression |
|
Use Scenario: Safeguarding input stage of 36 V input buck converters in solar charge controllers and telecom rectifiers against lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on HV input rail, coordinated with upstream fuse and downstream ceramic filtering. Use Value: Absorbs 400 W pulses without thermal runaway, enabling compact layout with minimal heatsinking due to RθJA = 120 °C/W. |
Use Scenario: Preventing gate oxide rupture in high-side N-channel MOSFET drivers subjected to Miller-induced voltage spikes during fast switching. IC Role / Device Role / Timing Role: Low-capacitance (CJ < 100 pF) TVS placed between gate and source, triggered only above 40 V. Use Value: Responds in <1 ns to limit gate-source voltage to <58.1 V, preserving 60 V-rated MOSFETs without adding propagation delay to PWM signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36A-E3/61 | Same electrical specs and SMA package, but commercial-grade (non-AEC-Q101); RoHS-compliant, MSL Level 1, 1800-piece 7" reel. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select SMAJ36AHE3_A/I when automotive PPAP, extended temperature validation, or OEM compliance is required. |
| SMBJ36AHE3_A/I | Same VWM/VBR/VC, but SMB (DO-214AA) package - 29 % larger footprint, 500 W PPPM, higher IPPM (10.3 A). | Better surge handling for high-energy applications; requires larger PCB area and different pad layout. | Choose SMBJ36AHE3_A/I only if 500 W rating is needed and board space permits SMB footprint. |
Compared with SMAJ36A-E3/61, SMAJ36AHE3_A/I adds AEC-Q101 qualification and automotive traceability; compared with SMBJ36AHE3_A/I, it trades 100 W pulse power for 29 % smaller board area and identical thermal profile on standard pads - making SMAJ36AHE3_A/I optimal for space-constrained automotive modules requiring certified reliability.
Availability
SMAJ36AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor transmitters, and DC-DC converter input stages requiring stable component supply with full AEC-Q101 documentation and traceable lot history.
Supply support for SMAJ36AHE3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and automotive-grade qualification.
The SMAJ series is engineered for board-level transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where fast response, low clamping, and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum clamping voltage of the SMAJ36AHE3_A/I under a 10/1000 μs surge?
The SMAJ36AHE3_A/I has a maximum clamping voltage (VC) of 58.1 V at 6.9 A peak pulse current (IPPM) under the standardized 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024. The SMAJ36AHE3_A/I maintains this clamping performance across its rated junction temperature range, ensuring predictable overvoltage protection for downstream 40 V-rated components.
Is SMAJ36AHE3_A/I AEC-Q101 qualified, and what does that cover?
Yes, SMAJ36AHE3_A/I is AEC-Q101 qualified, as explicitly stated in the Vishay ordering information table (page 3) and noted in the mechanical data section. This qualification covers stress tests including high-temperature operating life, temperature cycling, unbiased highly accelerated stress testing (uHAST), and electrostatic discharge (HBM/MM). The "HE3" suffix denotes RoHS-compliant and AEC-Q101 qualified construction, making SMAJ36AHE3_A/I suitable for automotive powertrain, chassis, and body electronics.
What is the standoff voltage (VWM) and why is it important for SMAJ36AHE3_A/I?
The standoff voltage (VWM) of SMAJ36AHE3_A/I is 36 V - the maximum DC or RMS voltage the device can withstand continuously without entering avalanche conduction. This parameter ensures reliable operation in 36 V nominal systems (e.g., 12 V/24 V/36 V automotive architectures) while providing sufficient margin below the 40.0 V minimum breakdown voltage. Selecting a VWM equal to the system's normal operating voltage prevents false triggering and minimizes leakage current (<1.0 μA), preserving signal integrity and power efficiency in the SMAJ36AHE3_A/I application.
How does the SMAJ36AHE3_A/I package compare to SMBJ variants in terms of board space and thermal performance?
The SMAJ36AHE3_A/I uses the SMA (DO-214AC) package - measuring 0.208" × 0.157" - which occupies 29 % less PCB area than the SMB (DO-214AA) package used by SMBJ36AHE3_A/I. Both share identical thermal resistance values (RθJA = 120 °C/W on 0.2" × 0.2" pads), but SMAJ36AHE3_A/I is rated for 400 W peak pulse power versus 500 W for SMBJ36AHE3_A/I. Thus, SMAJ36AHE3_A/I prioritizes miniaturization without sacrificing thermal reliability in space-constrained automotive modules.
Does SMAJ36AHE3_A/I have polarity marking, and how is it identified on the device?
Yes, SMAJ36AHE3_A/I is a unidirectional TVS diode and features a visible cathode band on the SMA package body - consistent with standard diode polarity marking conventions. The cathode end connects to the protected line (e.g., 36 V rail), while the anode connects to ground. This marking is verified in the Vishay mechanical drawing (page 5) and aligns with JEDEC DO-214AC specifications. No marking appears on bidirectional variants, but SMAJ36AHE3_A/I always includes the band to ensure correct orientation during automated placement and manual inspection.
SMAJ36AHE3_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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ36AHE3_A/I FAQ
1.How can I place an order for SMAJ36AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ36AHE3_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 SMAJ36AHE3_A/I reliable?
The price and inventory of SMAJ36AHE3_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 SMAJ36AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ36AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ36AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ36AHE3_A/I?
SMAJ36AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ36AHE3_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 SMAJ36AHE3_A/I?
For technical support, including SMAJ36AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ36AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ36AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ36AHE3_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 SMAJ36AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ36AHE3_A/I?
All SMAJ36AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ36AHE3_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 SMAJ36AHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ36AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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