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Vishay General Semiconductor - Diodes Division SMA5J18C-E3/61
- Part No.:
- SMA5J18C-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J18C-E3/61.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,664
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Product details
Overview
SMA5J18C-E3/61 from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for high-energy surge protection on signal and power lines. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 500 W peak pulse power (PPPM), and clamps transients to ≤27.6 V at 17.1 A IPPM - used in automotive sensor interfaces, industrial I/O protection, and telecom line conditioning.
For engineers reviewing the SMA5J18C-E3/61 datasheet, SMA5J18C-E3/61 pinout, SMA5J18C-E3/61 application, or SMA5J18C-E3/61 equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, 150 °C junction rating, low incremental surge resistance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bi-directional TVS diode operates symmetrically in both polarities, with electrical characteristics defined identically for forward and reverse directions per J-STD-020 MSL Level 1 and AEC-Q101 stress testing. Its glass-passivated junction ensures stable VBR tolerance and fast response (<1 ns) to ESD and lightning-induced transients.
The device uses a planar construction in DO-214AC package with matte tin-plated leads, rated for 10/1000 μs waveform surges up to 500 W, and exhibits thermal resistance of 80 °C/W (junction-to-ambient) when mounted on minimum recommended pad layout.
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 threshold range for reliable turn-on |
| VC @ IPPM | 27.6 V at 17.1 A - clamping voltage under full 500 W surge, limiting downstream stress |
| PPPM | 500 W - peak pulse power handling for 10/1000 μs transients, defining surge robustness |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| MSL Level | Level 1 (260 °C peak reflow) - supports standard lead-free SMT assembly without preconditioning |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
DO-214AC (SMA) surface-mount package with two terminals: anode and cathode. Bi-directional configuration means no polarity marking; both terminals are functionally identical for transient suppression in AC or bidirectional DC paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | Conducts surge current during positive overvoltage events; symmetrical with cathode |
| Cathode | Transient current entry (negative half-cycle) | Conducts surge current during negative overvoltage events; symmetrical with anode |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating differential lines without polarity concerns |
| Glass passivated junction | Ensures long-term VBR stability and low leakage (<1 μA at VWM) across temperature and life cycle |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a) |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body electronics, and ADAS sensor interfaces |
| MSL Level 1 rating | Permits direct placement into lead-free reflow ovens without dry-pack or baking requirements |
Applications
| Automotive Sensor Protection | Industrial Fieldbus Interface |
|---|---|
Use Scenario: Protecting CAN FD or LIN bus transceivers from load dump and inductive switching spikes in engine control modules. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential bus lines to limit transient excursions below IC absolute maximum ratings. Use Value: Maintains signal integrity during 12 V system load dump (ISO 16750-2) by clamping to ≤27.6 V while absorbing 500 W surge energy. | Use Scenario: Safeguarding RS-485 transceivers in factory automation PLCs exposed to motor drive noise and ground bounce. IC Role / Device Role / Timing Role: Symmetrical transient suppressor across A/B data lines to prevent latch-up or damage during EFT bursts (IEC 61000-4-4). Use Value: Provides sub-1 ns response and <1 μA leakage at 18 V, ensuring minimal impact on data eye diagram and DC bias conditions. |
| Telecom Line Card Protection | Consumer Power Adapter Input Stage |
Use Scenario: Front-end surge protection for DSL or POTS line interface circuits subjected to lightning-induced surges per ITU-T K.20. IC Role / Device Role / Timing Role: Primary clamping device shunting induced common-mode energy between tip/ring and ground. Use Value: Withstands repeated 10/1000 μs surges up to 17.1 A while maintaining VWM = 18 V for compatibility with -48 V DC feed systems. | Use Scenario: Secondary-side overvoltage protection on 19 V laptop adapter outputs against regulator failure or feedback loop loss. IC Role / Device Role / Timing Role: Fast-acting bi-directional clamp preventing downstream USB-C PD controller damage during output short-circuit recovery. Use Value: Clamps fault voltage to 27.6 V within nanoseconds, protecting 20 V-rated silicon while supporting RoHS-compliant, lead-free reflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J18CA-E3/61 | Identical electrical specs and packaging; CA suffix explicitly denotes bi-directional version per Vishay nomenclature | No functional difference - SMA5J18C-E3/61 and SMA5J18CA-E3/61 refer to same bi-directional device; "C" implies CA in this family | Select SMA5J18CA-E3/61 if ordering system requires explicit CA suffix for procurement clarity |
| SMCJ18CA | Same VWM/VBR/VC specs but in larger DO-214AB (SMC) package; higher thermal mass and RθJA = 35 °C/W vs. 80 °C/W | Better suited for higher average power dissipation or less aggressive board layout; not drop-in due to footprint mismatch | Choose SMCJ18CA only when PCB layout allows larger footprint and thermal design requires lower junction temperature rise |
Compared with SMA5J18C-E3/61, SMA5J18CA-E3/61 is a nomenclature-equivalent part with identical performance, while SMCJ18CA offers superior thermal handling in a non-compatible package - making SMA5J18C-E3/61 optimal for space-constrained, AEC-Q101-compliant SMT designs requiring DO-214AC footprint.
Availability
SMA5J18C-E3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial fieldbus nodes, telecom line cards, and consumer power adapter protection requiring stable component supply and AEC-Q101 compliance.
Supply support for SMA5J18C-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, MOSFETs, and protection devices with emphasis on reliability and automotive-grade qualification.
The SMA5J series is engineered for high-power-density transient suppression in harsh environments, targeting applications where compact size, fast response, and AEC-Q101 validation are mandatory - especially in vehicle electrification and industrial connectivity.
FAQ
What does the "C" suffix mean in SMA5J18C-E3/61?
The "C" in SMA5J18C-E3/61 indicates a bi-directional configuration, consistent with Vishay's naming convention where "CA" denotes bi-directional devices. This means SMA5J18C-E3/61 provides symmetrical clamping in both polarities - critical for protecting AC-coupled or floating signal lines. The device has no polarity marking, and its VBR, VWM, and VC values apply identically in either direction, as confirmed in the official Vishay datasheet revision 24-Oct-12.
Is SMA5J18C-E3/61 qualified for automotive applications?
Yes, SMA5J18C-E3/61 is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias, temperature cycling, and unbiased highly accelerated stress testing. This qualification validates its use in automotive subsystems such as body control modules, ADAS sensor interfaces, and infotainment power rails - provided the design adheres to the specified mounting conditions (e.g., 5.0 mm × 5.0 mm copper pads) and thermal derating curves shown in the SMA5J18C-E3/61 datasheet.
What is the clamping voltage of SMA5J18C-E3/61 under surge conditions?
The clamping voltage (VC) of SMA5J18C-E3/61 is 27.6 V at 17.1 A peak pulse current (IPPM), measured using the standardized 10/1000 μs waveform. This value represents the maximum voltage seen across the device during a full 500 W transient event. It ensures downstream components rated for ≤30 V absolute maximum can be reliably protected - a key parameter verified in Vishay's electrical characteristics table for SMA5J18C-E3/61 under TA = 25 °C conditions.
Does SMA5J18C-E3/61 require special PCB layout considerations?
Yes - SMA5J18C-E3/61 must be mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated PPPM = 500 W and proper thermal dissipation. Smaller pads reduce surge capability and increase junction temperature. The DO-214AC footprint also requires adherence to Vishay's pad layout dimensions (e.g., 0.074" max terminal width) to ensure solder joint reliability and avoid tombstoning during lead-free reflow - all specified for SMA5J18C-E3/61 in the mechanical drawings.
How does SMA5J18C-E3/61 differ from uni-directional variants like SMA5J18A-E3/61?
SMA5J18C-E3/61 is bi-directional with no polarity marking and symmetrical VBR/VWM/VC in both directions, whereas SMA5J18A-E3/61 is uni-directional, marked with a cathode band, and specifies VF = 3.5 V at 25 A forward conduction. SMA5J18C-E3/61 cannot conduct steady-state forward current like a rectifier; it only clamps transients. This makes SMA5J18C-E3/61 ideal for AC or differential signal lines, while SMA5J18A-E3/61 suits DC power rail protection where unidirectional conduction is acceptable.
SMA5J18C-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMA5J18C-E3/61 FAQ
1.How can I place an order for SMA5J18C-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J18C-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 SMA5J18C-E3/61 reliable?
The price and inventory of SMA5J18C-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 SMA5J18C-E3/61 is usually 5 days.
3.What payment methods are accepted for SMA5J18C-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J18C-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J18C-E3/61?
SMA5J18C-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J18C-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 SMA5J18C-E3/61?
For technical support, including SMA5J18C-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J18C-E3/61 requirements.
6.How does Aetrix verify that SMA5J18C-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMA5J18C-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 SMA5J18C-E3/61 meets industry standards.
7.What is the process for return or replacement of SMA5J18C-E3/61?
All SMA5J18C-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J18C-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 SMA5J18C-E3/61 part is unused and in its original packaging.
Return procedure for SMA5J18C-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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