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Vishay General Semiconductor - Diodes Division SMAJ36A-M3/5A
- Part No.:
- SMAJ36A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ36A-M3/5A.pdf
- Description:
- TVS DIODE 36VWM 58.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,325
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Product details
Overview
SMAJ36A-M3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 36 V stand-off 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), with 400 W peak pulse power rating (10/1000 μs waveform). It is used in automotive power line and sensor interface protection where fast response and low clamping voltage are critical.
For engineers reviewing the SMAJ36A-M3/5A datasheet, SMAJ36A-M3/5A pinout, SMAJ36A-M3/5A application, or SMAJ36A-M3/5A equivalent, key selection criteria include its unidirectional polarity, SMA (DO-214AC) package compatibility, AEC-Q101 qualification eligibility (via HM3 suffix), 150 °C max junction temperature, and 0.069 %/°C VBR temperature coefficient - all essential for automotive-grade ESD and load-dump surge resilience.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, conducting only when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ps), enabling suppression of ESD (IEC 61000-4-2) and lightning-induced surges (IEC 61000-4-5).
The device delivers 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W. Its 0.2" × 0.2" copper pad mounting requirement directly impacts sustained surge handling capability and PCB layout thermal design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal/power rail margin. |
| VBR (min/max) | 40.0 V / 44.2 V at 1 mA - Confirmed breakdown range ensures reliable turn-on without premature conduction. |
| VC @ IPPM | ≤58.1 V at 6.9 A - Clamping voltage under 10/1000 μs surge; determines maximum stress on downstream ICs. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak surge energy absorption capacity; defines survivability against ISO 7637-2 Pulse 1/2a/5a events. |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage preserves battery life and signal integrity in always-on circuits. |
| TJ max. | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with automated assembly; 5.28 mm × 4.50 mm outline. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; cathode indicated by band marking on unidirectional types like SMAJ36A-M3/5A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side reference | Connected to ground or lower-potential node; forms clamping path during overvoltage events. |
| Cathode | Reverse-biased terminal / high-side connection | Connected to protected line (e.g., 12 V supply or CAN_H); conducts when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables compliance with ISO 7637-2 Pulse 5a (load dump) in 12 V automotive systems without external series impedance. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot across protected ICs, reducing risk of latch-up or gate oxide damage in MOSFET drivers. |
| MSL Level 1 (260 °C reflow) | Supports single-pass lead-free reflow soldering without moisture-related popcorning or delamination. |
| AEC-Q101 qualification option (HM3 suffix) | Validated for automotive use including temperature cycling, HTRB, and ESD testing per JESD22-A114. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under humidity and thermal stress, critical for 15-year vehicle lifetimes. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Protecting 12 V supply rails in body control modules (BCM) against load dump transients up to 120 V. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery feed and LDO input. Use Value: Limits voltage to ≤58.1 V during 400 W surges, preventing damage to 40 V-rated regulators and microcontrollers. |
Use Scenario: Shielding analog outputs of pressure sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Parallel-connected TVS on 4–20 mA loop output lines exposed to cable ESD and inductive kickback. Use Value: Sub-1 ns response clamps transients before op-amp inputs saturate, preserving measurement accuracy and avoiding reset events. |
| Telecom DC Power Input | Consumer USB-C Port Protection |
|
Use Scenario: Safeguarding PoE-powered network switches against induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of DC-DC converter and hot-swap controller. Use Value: Withstands repetitive 300 W surges above 78 V, meeting IEC 61000-4-5 Level 3 (2 kV line-earth) requirements. |
Use Scenario: Secondary-level surge protection on VBUS line of USB-C receptacles in portable monitors. IC Role / Device Role / Timing Role: Standoff-rated TVS co-located with polymer PTC and ESD diode array for multi-stage defense. Use Value: 36 V VWM avoids interference with 20 V PD 3.0 operation while clamping 8 kV contact ESD to <60 V. |
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-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free; no AEC-Q101 qualification path. | Preferred for commercial/industrial designs where halogen-free material is not mandated. | Select when cost sensitivity outweighs automotive compliance or halogen-free requirements. |
| SMAJ36CA-M3/5A | Bidirectional variant; symmetric VBR (40.0–44.2 V) in both directions; same VWM and clamping. | Required for AC-coupled or differential signal lines (e.g., RS-485, CAN FD) where polarity reversal occurs. | Choose only if bidirectional protection is needed; not a drop-in replacement due to polarity and circuit topology impact. |
Compared with SMAJ36A-M3/5A, the E3 variant offers identical surge performance at lower cost but lacks halogen-free certification, while the 36CA variant enables AC signal protection but requires redesign of grounding and biasing - neither is pin-compatible without schematic revision.
Availability
SMAJ36A-M3/5A is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom DC inputs, and consumer USB-C port protection requiring stable component supply and halogen-free compliance.
Supply support for SMAJ36A-M3/5A 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 automotive-grade validation.
The SMAJ series targets high-energy transient suppression in harsh environments, engineered specifically for ISO 7637-2 and IEC 61000-4-5 compliance in automotive, industrial, and telecom infrastructure.
FAQ
What is the maximum clamping voltage of the SMAJ36A-M3/5A under a 10/1000 μs surge?
The SMAJ36A-M3/5A clamps to a maximum of 58.1 V at its rated peak pulse current of 6.9 A (10/1000 μs waveform). This value is guaranteed per Vishay's datasheet (Document Number: 88390, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMAJ36A-M3/5A achieves this with a low clamping ratio of ~1.45 relative to its minimum VBR of 40.0 V.
Is the SMAJ36A-M3/5A qualified to AEC-Q101?
The SMAJ36A-M3/5A itself is not AEC-Q101 qualified; however, the HM3 suffix indicates halogen-free and RoHS-compliant construction, and Vishay offers AEC-Q101-qualified versions under the ordering code SMAJ36AHM3_A/I (with revision code "A" or "I"). To obtain AEC-Q101 qualification, users must specify the HM3_X variant with appropriate revision suffix - the base SMAJ36A-M3/5A does not carry this certification.
What is the thermal resistance junction-to-ambient for the SMAJ36A-M3/5A?
The SMAJ36A-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard JEDEC test conditions and directly affects power derating above 25 °C ambient. For higher reliability in sustained surge scenarios, designers should verify board layout adherence to Vishay's mounting pad recommendations to maintain this RθJA.
Can the SMAJ36A-M3/5A be used in bidirectional signal lines like RS-485?
No - the SMAJ36A-M3/5A is unidirectional and contains a cathode band marking; it conducts only in reverse bias and blocks forward current. For bidirectional signal lines such as RS-485 or CAN, the SMAJ36CA-M3/5A (bidirectional variant) must be used instead. Using SMAJ36A-M3/5A on AC-coupled lines risks forward conduction, distortion, or failure during negative transients.
What is the reverse leakage current specification for the SMAJ36A-M3/5A at its stand-off voltage?
The SMAJ36A-M3/5A exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 36 V stand-off voltage (VWM), measured at 25 °C ambient. This ultra-low leakage preserves system efficiency in battery-powered applications and prevents false triggering in high-impedance sensing nodes. The value is confirmed in Vishay's Electrical Characteristics table (Document Number: 88390, page 2) and remains stable across temperature due to its glass-passivated junction.
SMAJ36A-M3/5A 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ36A-M3/5A FAQ
1.How can I place an order for SMAJ36A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ36A-M3/5A 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 SMAJ36A-M3/5A reliable?
The price and inventory of SMAJ36A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ36A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ36A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ36A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ36A-M3/5A?
SMAJ36A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ36A-M3/5A 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 SMAJ36A-M3/5A?
For technical support, including SMAJ36A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ36A-M3/5A requirements.
6.How does Aetrix verify that SMAJ36A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ36A-M3/5A 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 SMAJ36A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ36A-M3/5A?
All SMAJ36A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ36A-M3/5A, 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 SMAJ36A-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ36A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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