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Vishay General Semiconductor - Diodes Division SMA5J18-E3/61
- Part No.:
- SMA5J18-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J18-E3/61.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,764
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Product details
Overview
SMA5J18-E3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for high-energy surge protection on power and signal lines. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 29.2 V clamping voltage (VC) at 17.1 A peak pulse current, and 500 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 SMA5J18-E3/61 datasheet, SMA5J18-E3/61 pinout, SMA5J18-E3/61 application, or SMA5J18-E3/61 equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (<1 µA leakage at 18 V), but triggers into low-impedance conduction when transient voltage exceeds VBR, limiting downstream voltage to ≤29.2 V. Its glass-passivated junction ensures stable breakdown and fast response (<1 ns).
Designed for single-polarity DC rails, SMA5J18-E3/61 supports surge immunity per IEC 61000-4-5 (10/1000 µs) and complies with AEC-Q101 stress tests including temperature cycling, HTRB, and surge current endurance - validated for automotive body electronics and industrial control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - guaranteed breakdown range defining turn-on threshold |
| VC @ IPPM | 29.2 V at 17.1 A - clamped voltage during 500 W surge, limiting stress on protected ICs |
| PPPM | 500 W - peak pulse power handling capability with 10/1000 µs waveform |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| MSL Level | Level 1 (per J-STD-020) - no floor life limitation; safe for reflow up to 260 °C peak |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including HTGB, TC, and surge lifetime |
Pinout & Package
DO-214AC (SMA) surface-mount package: molded epoxy case with matte tin-plated leads; cathode indicated by band on one end; dimensions 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); thermal resistance RθJA = 80 °C/W on standard 0.2" × 0.2" copper pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line (e.g., ground or return path) |
| Cathode (banded end) | Reverse-biased blocking terminal | Connected to higher-potential side (e.g., 12 V rail); defines unidirectional clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, improving protection margin for 3.3 V/5 V logic |
| AEC-Q101 qualification | Validates suitability for automotive applications including body control modules and infotainment power rails |
| MSL Level 1 rating | Enables direct placement into high-temperature lead-free reflow without baking or dry-pack requirements |
| UL 94 V-0 molding compound | Meets flammability safety standards for enclosed industrial and automotive enclosures |
Applications
| Automotive Body Control Unit (BCU) | Industrial PLC Digital Input Module |
|---|---|
Use Scenario: Protecting microcontroller GPIOs and CAN transceiver power pins from load-dump and inductive switching surges in 12 V vehicle networks. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between 12 V supply and ground, triggered only during overvoltage events. Use Value: Clamps transients to ≤29.2 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic powered from local LDOs. | Use Scenario: Safeguarding 24 V digital input circuitry against field-wiring induced surges and ESD in factory automation systems. IC Role / Device Role / Timing Role: Primary surge clamp on the front-end optocoupler supply rail, upstream of series current-limiting resistor. Use Value: Absorbs 500 W pulses without degradation, maintaining signal integrity across 10 kV EFT and 1 kV surge immunity tests. |
| Consumer Appliance Power Supply | Telecom Remote Sensor Node |
Use Scenario: Suppressing switching noise and lightning-induced surges on AC/DC adapter output rails feeding motor drivers and MCU cores. IC Role / Device Role / Timing Role: Secondary-side TVS on +5 V or +12 V output, parallel to bulk capacitor. Use Value: Fast <1 ns response prevents voltage spikes from propagating to sensitive analog sensors and communication ICs. | Use Scenario: Protecting RS-485 transceivers and battery management ICs in outdoor IoT nodes exposed to lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Bidirectional-capable design not used; SMA5J18-E3/61 applied unidirectionally on VCC–GND path of isolated power domain. Use Value: 17.1 A IPPM rating sustains multiple 10/1000 µs surges per IEC 61000-4-5 Level 3 compliance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J18AHE3/61 | AEC-Q101 qualified variant with identical electrical specs; HE3 suffix denotes whisker test class 2 compliance | Required for automotive safety-critical modules where enhanced whisker resistance is mandated | Select SMA5J18AHE3/61 when AEC-Q101 full qualification documentation and JESD 201 Class 2 whisker performance are contractually required |
| SMC5J18A-E3/73 | Same VWM/VBR/VC specs but in larger DO-214AB (SMC) package; 500 W rating maintained; RθJA = 35 °C/W vs. 80 °C/W | Better thermal performance for high-duty-cycle surge environments; requires larger PCB footprint | Choose SMC5J18A-E3/73 when ambient temperature exceeds 85 °C or surge repetition rate exceeds 1 Hz |
Compared with SMA5J18AHE3/61, the SMA5J18-E3/61 offers commercial-grade qualification with JESD 201 Class 1A whisker testing - sufficient for non-safety automotive subsystems and industrial controls. Versus SMC5J18A-E3/73, it trades thermal margin for space-constrained layouts where 0.2" × 0.2" pad area is fixed.
Availability
SMA5J18-E3/61 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, and consumer appliance power supply designs requiring stable component supply, RoHS-compliant sourcing, and AEC-Q101-adjacent reliability.
Supply support for SMA5J18-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, rectifiers, TVS devices, and MOSFETs with emphasis on high-reliability, high-power-density solutions.
The SMA5J series is engineered for robust transient suppression in space-constrained, high-surge environments - targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated without increasing board area.
FAQ
What is the polarity configuration of SMA5J18-E3/61?
SMA5J18-E3/61 is a unidirectional TVS diode: the banded end marks the cathode and must be connected to the higher-potential side of the protected line (e.g., +12 V rail), while the anode connects to ground or return. This configuration enables clamping only during positive transients relative to ground - critical for DC power rail protection where reverse conduction is not required.
Does SMA5J18-E3/61 meet automotive qualification standards?
SMA5J18-E3/61 is RoHS-compliant and manufactured to Vishay's commercial-grade specifications, including MSL Level 1 and UL 94 V-0. While it shares the same die and package as AEC-Q101-qualified SMA5J18AHE3/61, the SMA5J18-E3/61 itself is not AEC-Q101 certified - use SMA5J18AHE3/61 for applications requiring formal automotive qualification documentation.
What is the maximum clamping voltage of SMA5J18-E3/61 under surge conditions?
The maximum clamping voltage (VC) of SMA5J18-E3/61 is 29.2 V, measured at 17.1 A peak pulse current (IPPM) using a 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a 500 W transient event - essential for ensuring downstream 3.3 V or 5 V ICs remain within absolute maximum ratings.
Can SMA5J18-E3/61 be used in bidirectional surge protection applications?
No - SMA5J18-E3/61 is strictly unidirectional and lacks symmetrical breakdown characteristics. For bidirectional protection (e.g., AC lines or data buses), Vishay specifies CA-suffix variants like SMA5J18CA. Using SMA5J18-E3/61 in reverse-biased configurations risks premature failure due to lack of rated reverse conduction capability.
What is the thermal resistance and recommended pad layout for SMA5J18-E3/61?
SMA5J18-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To achieve this rating, use minimum recommended pad dimensions per Vishay's DO-214AC outline drawing - undersized pads increase thermal impedance and reduce surge endurance.
SMA5J18-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 15.5A
- Power - Peak Pulse:
- 500W
- 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)
SMA5J18-E3/61 FAQ
1.How can I place an order for SMA5J18-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J18-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 SMA5J18-E3/61 reliable?
The price and inventory of SMA5J18-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 SMA5J18-E3/61 is usually 5 days.
3.What payment methods are accepted for SMA5J18-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J18-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J18-E3/61?
SMA5J18-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J18-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 SMA5J18-E3/61?
For technical support, including SMA5J18-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J18-E3/61 requirements.
6.How does Aetrix verify that SMA5J18-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMA5J18-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 SMA5J18-E3/61 meets industry standards.
7.What is the process for return or replacement of SMA5J18-E3/61?
All SMA5J18-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J18-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 SMA5J18-E3/61 part is unused and in its original packaging.
Return procedure for SMA5J18-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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