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Vishay General Semiconductor - Diodes Division SMA5J18CHE3/61
- Part No.:
- SMA5J18CHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J18CHE3/61.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,733
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Product details
Overview
SMA5J18CHE3/61 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 ≤29.2 V at 17.1 A IPPM. It is AEC-Q101 qualified and used in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMA5J18CHE3/61 datasheet, SMA5J18CHE3/61 pinout, SMA5J18CHE3/61 application, or SMA5J18CHE3/61 equivalent, this page provides verified electrical parameters, package dimensions, clamping behavior under 10/1000 µs surges, AEC-Q101 qualification status, and direct alternatives for automotive-grade transient suppression.
Technical Context
The SMA5J18CHE3/61 operates as a bi-directional avalanche diode with symmetrical clamping in both polarities, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 µA at 18 V), while its low incremental surge resistance supports consistent clamping across repetitive transients.
Designed for surface-mount placement on PCBs with minimum 5.0 mm × 5.0 mm copper pads per terminal, it delivers thermal resistance of 80 °C/W (junction-to-ambient) and 25 °C/W (junction-to-lead), supporting operation from –55 °C to +150 °C. The device meets MSL Level 1 and JESD201 Class 2 whisker testing requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse voltage before conduction begins; defines operating margin for protected line. |
| VBR min/max | 20.0 V / 22.1 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | ≤29.2 V - Clamped voltage at 17.1 A peak pulse current (10/1000 µs); determines maximum stress on downstream ICs. |
| PPPM | 500 W - Peak pulse power handling capability; enables robust protection against IEC 61000-4-5 Level 4 surges. |
| TJ max | +150 °C - Maximum junction temperature; supports under-hood automotive use with adequate board thermal design. |
| Polarity | Bi-directional - No cathode marking; protects AC signals or bidirectional buses like CAN, LIN, or RS-485 without orientation constraints. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, RoHS-compliant, matte tin-plated leads, UL 94 V-0 molding compound. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H). Cathode band absent - bi-directional configuration confirmed by HE3 suffix and CA designation in family naming.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; no polarity dependency - simplifies layout and eliminates orientation errors during assembly. |
| Case (body) | Thermal and mechanical interface | DO-214AC body transfers heat to PCB copper; requires ≥5.0 mm × 5.0 mm pad per terminal for rated PPPM performance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and ADAS sensor interfaces requiring reliability over temperature and lifetime. |
| Glass passivated junction | Ensures stable VBR tolerance (±5 %), low leakage (<1 µA), and long-term parameter stability under thermal cycling. |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak - compatible with standard SMT assembly without baking. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulses), improving clamping precision. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting analog outputs of pressure or temperature sensors in engine compartments exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bi-directional TVS clamp placed between sensor output and microcontroller ADC input. Use Value: Limits transient voltage to ≤29.2 V, preventing ADC saturation or ESD-induced latch-up in AEC-Q100-compliant MCUs. | Use Scenario: Guarding RS-485 transceiver pins in factory automation PLCs subject to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary surge suppression element on differential bus lines, upstream of transceiver ESD diodes. Use Value: Absorbs 500 W peak energy per line, maintaining signal integrity during 10/1000 µs surges up to ±1 kV (IEC 61000-4-5). |
| Consumer Power Adapter Input | Telecom Line Card Protection |
Use Scenario: Secondary-side overvoltage suppression in USB-C PD adapters where 18 V rails feed buck converters. IC Role / Device Role / Timing Role: Standoff-clamp TVS on 18 V DC bus, triggered only during fault conditions (e.g., feedback loop failure). Use Value: Prevents catastrophic failure of downstream MOSFETs or controllers by clamping to 29.2 V before reaching destructive thresholds. | Use Scenario: Protecting Ethernet PHY power pins (e.g., 18 V bias supply) in telecom base station line cards exposed to induced surges. IC Role / Device Role / Timing Role: High-power transient limiter on auxiliary supply rail feeding gigabit PHY ICs. Use Value: Maintains PHY functionality during repeated 500 W surges due to low clamping voltage and AEC-Q101-grade reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J18CAHE3/61 | Identical electrical specs and AEC-Q101 qualification; same DO-214AC package and HE3 suffix. | No functional difference - alternate part numbering convention used by Vishay for same device. | Select SMA5J18CHE3/61 when ordering from distributors using E3/HE3 nomenclature; SMA5J18CAHE3/61 is identical in form, fit, and function. |
| SMC5J18AHE3/61 | Same VWM/VBR/PPPM but in larger DO-214AB (SMC) package; higher thermal mass, RθJA = 35 °C/W vs. 80 °C/W. | Better suited for high-repetition surge environments or elevated ambient temperatures where DO-214AC thermal limits are exceeded. | Choose SMC5J18AHE3/61 only if board space allows and thermal derating above 25 °C is critical; otherwise SMA5J18CHE3/61 offers optimal power density. |
Compared with SMA5J18CHE3/61, SMA5J18CAHE3/61 is a documentation-equivalent variant, while SMC5J18AHE3/61 trades compact size for superior thermal performance - making the SMA version ideal for space-constrained automotive modules where 500 W single-pulse capability suffices.
Availability
SMA5J18CHE3/61 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, and consumer power adapter secondary-side protection requiring stable component supply and AEC-Q101 compliance.
Supply support for SMA5J18CHE3/61 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 TVS devices with emphasis on reliability, power density, and automotive qualification.
The SMA5Jxx series was engineered specifically for high-power-density transient suppression in space-limited automotive and industrial systems, balancing 500 W surge capability with DO-214AC footprint and AEC-Q101 validation.
FAQ
What is the clamping voltage of the SMA5J18CHE3/61 under a 10/1000 µs surge?
The SMA5J18CHE3/61 clamps to a maximum of 29.2 V when subjected to its rated peak pulse current of 17.1 A (10/1000 µs waveform). This value is measured at the device terminals with recommended PCB pad layout (5.0 mm × 5.0 mm copper per terminal) and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SMA5J18CHE3/61 suitable for automotive applications?
Yes, SMA5J18CHE3/61 is AEC-Q101 qualified and explicitly rated for automotive use. Its construction - including glass-passivated junction, MSL Level 1 moisture sensitivity, JESD201 Class 2 whisker resistance, and –55 °C to +150 °C operating range - meets stringent automotive reliability requirements for engine control, body electronics, and ADAS sensor protection.
What does the "HE3" suffix indicate in SMA5J18CHE3/61?
The "HE3" suffix in SMA5J18CHE3/61 denotes RoHS-compliant construction with AEC-Q101 qualification. "H" indicates automotive grade, "E3" confirms lead-free matte tin plating compliant with JEDEC J-STD-020 and JESD22-B102 solderability standards, and whisker-tested to JESD201 Class 2.
How does SMA5J18CHE3/61 differ from uni-directional variants like SMA5J18AHE3/61?
SMA5J18CHE3/61 is bi-directional (CA suffix), with symmetrical clamping in both polarities and no cathode marking. In contrast, SMA5J18AHE3/61 is uni-directional (A suffix), has a cathode band, conducts only in reverse bias, and exhibits forward voltage drop (~3.5 V at 25 A). The bi-directional version is required for AC or floating signal lines; the uni-directional version suits DC power rail protection.
What is the maximum leakage current of SMA5J18CHE3/61 at its stand-off voltage?
At its 18 V stand-off voltage (VWM), the SMA5J18CHE3/61 exhibits a maximum reverse leakage current of 1.0 µA at 25 °C. This low leakage ensures minimal power loss and signal distortion in always-on circuits such as automotive sensor bias networks or industrial analog monitoring lines.
SMA5J18CHE3/61 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J18CHE3/61 FAQ
1.How can I place an order for SMA5J18CHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J18CHE3/61 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 SMA5J18CHE3/61 reliable?
The price and inventory of SMA5J18CHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J18CHE3/61 is usually 5 days.
3.What payment methods are accepted for SMA5J18CHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J18CHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J18CHE3/61?
SMA5J18CHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J18CHE3/61 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 SMA5J18CHE3/61?
For technical support, including SMA5J18CHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J18CHE3/61 requirements.
6.How does Aetrix verify that SMA5J18CHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMA5J18CHE3/61 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 SMA5J18CHE3/61 meets industry standards.
7.What is the process for return or replacement of SMA5J18CHE3/61?
All SMA5J18CHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J18CHE3/61, 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 SMA5J18CHE3/61 part is unused and in its original packaging.
Return procedure for SMA5J18CHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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