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Vishay General Semiconductor - Diodes Division SMAJ36A-E3/5A
- Part No.:
- SMAJ36A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ36A-E3/5A.pdf
- Description:
- TVS DIODE 36VWM 58.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:15,910
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Product details
Overview
SMAJ36A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection on DC power rails and signal lines. It features a 36 V standoff voltage (VWM), 40.0–44.2 V breakdown voltage (VBR) at 1 mA, clamps transients to ≤58.1 V at 6.9 A peak pulse current, and delivers 400 W peak pulse power (10/1000 μs waveform). It is widely deployed in automotive power supply inputs and industrial sensor interface circuits.
For engineers reviewing the SMAJ36A-E3/5A datasheet, SMAJ36A-E3/5A pinout, SMAJ36A-E3/5A application, or SMAJ36A-E3/5A equivalent, this page provides verified electrical parameters, package dimensions, clamping behavior under surge conditions, thermal resistance data, and validated alternative parts for design-in flexibility and supply continuity.
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal bias it presents <1.0 μA reverse leakage at 36 V, but triggers into low-impedance conduction when transient voltage exceeds its 40.0–44.2 V breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance and long-term reliability across temperature.
It is rated for 400 W peak pulse power (derated to 300 W above 78 V), supports 40 A non-repetitive forward surge current (8.3 ms half-sine), and exhibits 0.100 %/°C temperature coefficient of VBR. Thermal resistance is 120 °C/W junction-to-ambient (on recommended 5.0 mm × 5.0 mm copper pads) and 30 °C/W junction-to-lead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin. |
| VBR (min/max) | 40.0 V / 44.2 V at 1 mA - Confirmed breakdown range; ensures predictable turn-on during transients. |
| VC @ IPPM | ≤58.1 V at 6.9 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W (10/1000 μs) - Peak transient energy handling capacity; sufficient for ISO 7637-2 Pulse 1/2a/5a in 12 V systems. |
| IFSM | 40 A (8.3 ms half-sine) - Surge current withstand without failure; critical for load-dump immunity. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| RθJA | 120 °C/W - Thermal resistance on standard 5.0 mm × 5.0 mm pads; informs PCB thermal layout requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads. Cathode indicated by band; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes shunt path during overvoltage events. |
| Cathode | High-side connection point | Connected to protected line (e.g., +12 V rail); carries full surge current into ground via anode. |
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. |
| Fast response time & low clamping voltage | Sub-nanosecond turn-on and ≤58.1 V clamping protect downstream MOSFET gates and IC inputs from destructive overshoot. |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments. |
| MSL Level 1 (260 °C reflow) | Supports lead-free SMT assembly without moisture sensitivity concerns or pre-bake requirements. |
| AEC-Q101 qualification option (HE3/HM3) | Validated for automotive-grade reliability; base part SMAJ36A-E3/5A is commercial grade but shares identical die and construction. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: 12 V battery-fed ECU power input exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Shunt TVS device placed between VIN and GND, triggered within nanoseconds to clamp surges. Use Value: Limits voltage to ≤58.1 V during 400 W transients, protecting downstream DC/DC controllers and microcontrollers. |
Use Scenario: Analog output line (e.g., 4–20 mA loop) of a pressure sensor in factory automation equipment. IC Role / Device Role / Timing Role: Unidirectional TVS connected in parallel with signal line to suppress ESD and inductive switching noise. Use Value: Withstands ±15 kV contact ESD (IEC 61000-4-2) and clamps fast transients to safe levels for op-amp input stages. |
| Consumer USB Power Port Protection | Telecom DC Feeder Protection |
|
Use Scenario: VBUS line of USB Type-A port in set-top box subjected to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Standoff-rated TVS (36 V) placed upstream of USB power switch to absorb 10/1000 μs surges. Use Value: Prevents latch-up or damage to USB controller ICs by limiting VBUS to ≤58.1 V during 6.9 A surge events. |
Use Scenario: -48 V DC power feed to remote radio unit in cellular base station infrastructure. IC Role / Device Role / Timing Role: Unidirectional TVS installed across feed line to suppress lightning-induced surges entering cabinet. Use Value: Handles repetitive 400 W surges per ITU-T K.20/K.21 standards while maintaining <1.0 μA leakage at nominal -48 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 |
|---|---|---|---|
| SMAJ36CA-E3/5A | Bidirectional variant; symmetric VBR (40.0–44.2 V) in both directions; no polarity marking. | Required where AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN bus) need protection without polarity constraints. | Select SMAJ36CA-E3/5A only if bidirectional clamping is required; SMAJ36A-E3/5A is optimal for DC rails with defined polarity. |
| SMBJ36A-E3/52 | Same VWM/VBR/VC, but SMB (DO-214AA) package; 600 W PPPM; higher IPPM (11.9 A). | Used where higher surge margin is needed (e.g., heavy-duty industrial motor drives) and PCB space allows larger footprint. | Choose SMBJ36A-E3/52 when 600 W rating is mandatory; SMAJ36A-E3/5A remains preferred for space-constrained automotive modules. |
Compared with SMAJ36CA-E3/5A, the SMAJ36A-E3/5A offers polarity-specific clamping ideal for DC power rails, while SMBJ36A-E3/52 provides higher surge capacity in a larger package-enabling trade-offs between board area, power handling, and circuit topology.
Availability
SMAJ36A-E3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, consumer USB power ports, and telecom DC feeder protection requiring stable component supply and RoHS-compliant packaging.
Supply support for SMAJ36A-E3/5A 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, precision, and high-volume manufacturability.
The SMAJ series was engineered for cost-effective, high-reliability transient suppression in automotive, industrial, and communications systems-prioritizing tight VBR tolerance, low clamping, and AEC-Q101 scalability.
FAQ
What is the standoff voltage (VWM) of the SMAJ36A-E3/5A?
The SMAJ36A-E3/5A has a standoff voltage (VWM) of 36 V, meaning it remains in high-impedance blocking mode up to this DC or RMS voltage level. This value ensures compatibility with nominal 36 V industrial systems and 12 V/24 V automotive rails with adequate safety margin before breakdown.
Does the SMAJ36A-E3/5A meet automotive qualification standards?
The base SMAJ36A-E3/5A is commercial-grade and RoHS-compliant, but Vishay offers AEC-Q101 qualified versions under ordering codes SMAJ36AHE3_X (e.g., HE3 suffix). The die, construction, and performance of SMAJ36A-E3/5A are identical to the qualified variants-only the test documentation and traceability differ.
What is the maximum clamping voltage (VC) for the SMAJ36A-E3/5A under surge conditions?
The SMAJ36A-E3/5A clamps to a maximum of 58.1 V when subjected to its rated peak pulse current of 6.9 A (10/1000 μs waveform). This clamping voltage is measured at the device terminals and defines the upper voltage limit imposed on protected circuitry during transient events.
Can the SMAJ36A-E3/5A be used in bidirectional signal protection applications?
No-the SMAJ36A-E3/5A is unidirectional and must be oriented with cathode toward the protected line. For bidirectional protection (e.g., differential buses), use the SMAJ36CA-E3/5A, which provides symmetrical clamping in both polarities and has no polarity marking.
What is the thermal resistance (RθJA) of the SMAJ36A-E3/5A, and how does it affect PCB layout?
The SMAJ36A-E3/5A has a typical RθJA of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain TJ ≤150 °C under sustained 3.3 W dissipation, designers must ensure adequate copper area and avoid excessive ambient temperature rise in the layout.
SMAJ36A-E3/5A 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-E3/5A FAQ
1.How can I place an order for SMAJ36A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ36A-E3/5A 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-E3/5A reliable?
The price and inventory of SMAJ36A-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ36A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ36A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ36A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ36A-E3/5A?
SMAJ36A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ36A-E3/5A 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-E3/5A?
For technical support, including SMAJ36A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ36A-E3/5A requirements.
6.How does Aetrix verify that SMAJ36A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ36A-E3/5A 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-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ36A-E3/5A?
All SMAJ36A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ36A-E3/5A, 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-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ36A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ36A-E3/5A Tags
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