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Vishay General Semiconductor - Diodes Division SMAJ36A-E3/61
- Part No.:
- SMAJ36A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ36A-E3/61.pdf
- Description:
- TVS DIODE 36VWM 58.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ36A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection of 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, 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 - deployed in automotive ECUs, industrial sensor interfaces, and USB/RS-485 port protection.
For engineers reviewing the SMAJ36A-E3/61 datasheet, SMAJ36A-E3/61 pinout, SMAJ36A-E3/61 application, or SMAJ36A-E3/61 equivalent, key selection criteria include clamping performance under 6.9 A surge, unidirectional polarity marking, SMA (DO-214AC) package thermal resistance (RθJA = 120 °C/W), and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This TVS operates as a clamping device: under normal bias it presents high impedance (>1 μA leakage at 36 V), but avalanches rapidly (<1 ps response) when transient voltage exceeds VBR, limiting downstream voltage to ≤58.1 V. Its glass-passivated junction ensures stable breakdown and low incremental surge resistance.
The SMAJ36A-E3/61 is rated for 40 A non-repetitive forward surge (8.3 ms half-sine), supports 150 °C max junction temperature, and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak - enabling compatibility with standard SMT assembly processes without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 36 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC rail margin. |
| VBR (min/max) | 40.0 V / 44.2 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across production lot. |
| VC @ IPPM | 58.1 V at 6.9 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's worst-case overvoltage exposure. |
| PPPM | 400 W - Peak pulse power handling capability; sufficient for ISO 7637-2 Pulse 1/2a/5a automotive transients. |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms); validates robustness against inductive switch-off events. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on 0.2" × 0.2" copper pads; informs PCB thermal design requirements. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
Pinout & Package
Package: SMA (DO-214AC) - surface-mount, low-profile plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and J-STD-002 solderability standards. Cathode indicated by band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND) in unidirectional configuration; enables clamping to ground during positive transients. |
| Cathode | Reverse-biased terminal | Marked with band; connected to protected line (e.g., 36 V rail); conducts avalanche current when line voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Supports high-energy transients common in automotive load-dump and inductive switching without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on downstream ICs like microcontrollers or CAN transceivers during surge events. |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| MSL Level 1, 260 °C peak reflow | Eliminates pre-baking requirement and supports standard lead-free SMT assembly without popcorn risk. |
| AEC-Q101 qualification path | Enables direct use in automotive applications when ordered as SMAJ36AHE3_X variant with full qualification documentation. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 36 V battery-supplied control modules from ISO 7637-2 Pulse 5a (load dump) transients up to 60 V. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between 36 V rail and chassis ground. Use Value: Limits transient voltage to ≤58.1 V, preventing damage to 40 V-rated DC-DC converters and MCU power inputs. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA transmitter) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted at connector entry point, cathode to signal line, anode to local ground. Use Value: Sub-1 ps response clamps fast transients before they reach precision op-amps or ADC front-ends. |
| USB Type-C VBUS Line Protection | RS-485 Transceiver Port Protection |
|
Use Scenario: Secondary overvoltage protection on USB-C VBUS (5–20 V) after primary buck converter, guarding against adapter fault conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS (36 V) used in series with current-limiting resistor to avoid false triggering during 20 V PD negotiation. Use Value: Provides fail-safe clamping only during >40 V faults, preserving normal 20 V operation without leakage impact. |
Use Scenario: Protecting RS-485 transceiver I/O pins (e.g., THVD1550) from lightning-induced surges on long industrial bus cables. IC Role / Device Role / Timing Role: Unidirectional TVS on each differential line (A/B) referenced to signal ground, with cathode to line. Use Value: 58.1 V clamping prevents latch-up or oxide rupture in transceiver ESD structures during multi-kV surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36A-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package. | No difference in circuit function or layout; selected where halogen-free compliance is mandated. | Direct material substitution when halogen-free bill-of-materials is required; same thermal and clamping behavior. |
| SMAJ36CA-E3/61 | Bidirectional version: symmetric VBR (40.0–44.2 V) in both polarities; no polarity marking. | Required for AC-coupled or floating signal lines (e.g., Ethernet PHY pairs) where bidirectional transients occur. | Use only when protecting non-ground-referenced signals; not interchangeable with SMAJ36A-E3/61 due to polarity and circuit topology. |
Compared with SMAJ36A-M3/61, the SMAJ36A-E3/61 offers standard RoHS compliance without halogen restriction; compared with SMAJ36CA-E3/61, it provides optimized unidirectional clamping for grounded DC rails - requiring explicit cathode orientation but delivering tighter leakage control below VWM.
Availability
SMAJ36A-E3/61 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and communication interface protection requiring stable component supply and traceable sourcing.
Supply support for SMAJ36A-E3/61 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 and automotive-grade qualification.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where high pulse power, fast response, and AEC-Q101 readiness are critical.
FAQ
What is the maximum clamping voltage of the SMAJ36A-E3/61 under a 10/1000 μs surge?
The SMAJ36A-E3/61 has a maximum clamping voltage (VC) of 58.1 V at 6.9 A peak pulse current with a 10/1000 μs waveform. This value is measured per industry-standard test conditions and defines the upper voltage limit imposed on protected circuits during surge events. The SMAJ36A-E3/61 maintains this clamping performance across its qualified operating temperature range.
Is the SMAJ36A-E3/61 suitable for automotive applications?
Yes - the SMAJ36A-E3/61 is part of Vishay's AEC-Q101-qualified product family when ordered with the HE3 suffix (e.g., SMAJ36AHE3_A). While the SMAJ36A-E3/61 itself is commercial-grade, its design basis, thermal robustness (TJ max = 150 °C), and surge ratings align with automotive requirements. For certified deployment, specify the HE3 variant and confirm qualification status with Vishay documentation.
What does the "-E3/61" suffix indicate in SMAJ36A-E3/61?
The "-E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads; "/61" specifies packaging in 7-inch diameter plastic tape and reel, with a base quantity of 1800 units. This ordering code ensures consistent assembly compatibility and traceability. The SMAJ36A-E3/61 is not halogen-free (that requires -M3) nor AEC-Q101 qualified (that requires -HE3).
How does the SMAJ36A-E3/61 differ from bidirectional TVS diodes like SMAJ36CA-E3/61?
The SMAJ36A-E3/61 is unidirectional with cathode marking and blocks reverse current above 36 V while conducting forward surges to ground; SMAJ36CA-E3/61 is bidirectional with symmetrical breakdown in both directions and no polarity marking. The SMAJ36A-E3/61 exhibits lower reverse leakage below VWM, making it preferred for DC rail protection, whereas SMAJ36CA-E3/61 suits AC or floating signal lines.
What PCB layout guidance applies to the SMAJ36A-E3/61 for optimal thermal performance?
For rated power dissipation, mount the SMAJ36A-E3/61 on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve the specified RθJA of 120 °C/W. Avoid thermal relief on pads; use solid copper pours connected to internal ground planes. Keep traces short and wide between the SMAJ36A-E3/61 and protected node to minimize inductance that could elevate clamping voltage during fast transients.
SMAJ36A-E3/61 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-E3/61 FAQ
1.How can I place an order for SMAJ36A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ36A-E3/61 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-E3/61 reliable?
The price and inventory of SMAJ36A-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ36A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ36A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ36A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ36A-E3/61?
SMAJ36A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ36A-E3/61 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-E3/61?
For technical support, including SMAJ36A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ36A-E3/61 requirements.
6.How does Aetrix verify that SMAJ36A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ36A-E3/61 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-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ36A-E3/61?
All SMAJ36A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ36A-E3/61, 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-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ36A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ36A-E3/61 Tags
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