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Vishay General Semiconductor - Diodes Division SMA5J18HE3/61
- Part No.:
- SMA5J18HE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J18HE3/61.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,834
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Product details
Overview
SMA5J18HE3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor diode in DO-214AC (SMA) package, rated for 18 V standoff voltage (VWM), 20.0–22.1 V breakdown (VBR), 500 W peak pulse power (10/1000 µs), and AEC-Q101 qualified for automotive electronics protection against inductive switching transients.
For engineers reviewing the SMA5J18HE3/61 datasheet, SMA5J18HE3/61 pinout, SMA5J18HE3/61 application, or SMA5J18HE3/61 equivalent, key selection criteria include clamping voltage (29.2 V at IPPM), low incremental surge resistance, JEDEC J-STD-020 MSL Level 1 rating, and RoHS-compliant matte tin-plated leads with JESD 201 Class 2 whisker resistance.
Technical Context
This unidirectional TVS diode operates as a shunt-clamping device across sensitive circuit nodes, conducting only when reverse voltage exceeds VBR to limit transient overvoltage to ≤29.2 V. Its glass-passivated junction ensures stable leakage (<1.0 µA at 18 V) and fast response time (<1 ns).
Designed for surface-mount placement on PCBs with minimum 0.2" × 0.2" copper pads per terminal, it delivers 500 W surge handling per IEC 61000-4-5 (10/1000 µs) while maintaining thermal resistance of 80 °C/W (junction-to-ambient) and 25 °C/W (junction-to-lead).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 20.0 V / 22.1 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 29.2 V - Clamped voltage during 500 W transient, limiting stress on downstream ICs |
| IPPM | 17.1 A - Peak surge current supported under 10/1000 µs waveform without failure |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| MSL Level | Level 1 (260 °C peak reflow) - Compatible with standard lead-free SMT assembly without dry-pack requirements |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with axial leads, cathode band marking on one end; total dimensions 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); RoHS-compliant matte tin plating; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (reverse-biased during clamping) | Connected to ground or lower-potential rail; forms shunt path when VREV > VBR |
| Cathode | Reverse voltage sensing node | Connected to protected line (e.g., CAN_H, LIN, sensor supply); marked by band |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage (<1.0 µA) over temperature and lifetime |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision |
| AEC-Q101 qualification | Validates robustness for automotive powertrain, body control, and ADAS subsystems |
| MSL Level 1 rating | Enables direct placement into high-volume SMT lines without baking or special handling |
| Matte tin plating (JESD 201 Class 2) | Prevents tin whisker growth in long-life automotive applications up to 150 °C |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between power rail and chassis ground. Use Value: Limits voltage to ≤29.2 V during 500 W surges, preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Safeguarding analog output lines of pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional-capable protection on signal lines exposed to ESD and cable discharge events. Use Value: Sub-1 ns response and <1.0 µA leakage preserve signal integrity and ADC accuracy over full industrial temperature range. |
| Consumer USB Port ESD Protection | Telecom DC Power Input Protection |
Use Scenario: Adding secondary-level surge immunity to USB VBUS lines in portable docking stations. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to system ground, absorbing ±8 kV contact ESD per IEC 61000-4-2. Use Value: 29.2 V clamping prevents latch-up in USB controller ICs while supporting 1.5 A steady-state current. | Use Scenario: Hardening -48 V telecom rectifier outputs against lightning-induced surges on central office equipment. IC Role / Device Role / Timing Role: Primary shunt protector on DC input bus upstream of DC-DC converters. Use Value: 500 W rating handles 10/1000 µs surges up to 17.1 A; DO-214AC footprint enables high-density layout with minimal trace inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J18A-E3/61 | Commercial grade (non-AEC-Q101), same VWM/VBR/VC, identical DO-214AC package | Lacks automotive qualification; suitable for consumer/industrial use only | Select when AEC-Q101 is not required and cost sensitivity outweighs automotive reliability needs |
| SMC5J18AHE3/61 | Same electrical specs but in larger DO-214AB (SMC) package; higher thermal mass (RθJA = 35 °C/W vs. 80 °C/W) | Better sustained surge handling; requires more PCB area and different pad layout | Choose for higher-reliability industrial power supplies where board space permits larger footprint |
Compared with SMA5J18A-E3/61, the SMA5J18HE3/61 adds AEC-Q101 validation and JESD 201 Class 2 whisker resistance-critical for automotive field life-while matching all electrical parameters; versus SMC5J18AHE3/61, it trades thermal performance for compact DO-214AC size, making it optimal for space-constrained automotive modules.
Availability
SMA5J18HE3/61 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, consumer USB power delivery, and telecom DC input protection requiring stable component supply and AEC-Q101 compliance.
Supply support for SMA5J18HE3/61 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 SMA5J series is designed specifically for high-energy transient suppression in harsh environments, targeting automotive power distribution, industrial control I/O, and telecom infrastructure where 500 W surge capability and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of the SMA5J18HE3/61 under maximum surge conditions?
The SMA5J18HE3/61 has a maximum clamping voltage (VC) of 29.2 V at its peak pulse current (IPPM) of 17.1 A, measured using a 10/1000 µs waveform. This value ensures downstream components like microcontrollers and CAN transceivers remain within safe operating voltage limits during transient events. The SMA5J18HE3/61 maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is the SMA5J18HE3/61 suitable for automotive applications?
Yes, the SMA5J18HE3/61 is AEC-Q101 qualified and features JESD 201 Class 2 whisker resistance, matte tin-plated leads, and MSL Level 1 reflow compatibility-making it fully suitable for automotive powertrain, body electronics, and ADAS modules. The SMA5J18HE3/61 also meets stringent thermal and surge requirements for under-hood environments up to +150 °C junction temperature.
How does the SMA5J18HE3/61 differ from the SMA5J18A-E3/61?
The SMA5J18HE3/61 differs from the SMA5J18A-E3/61 solely in qualification and plating: it carries AEC-Q101 certification and JESD 201 Class 2 whisker resistance, whereas the SMA5J18A-E3/61 is commercial-grade with Class 1A plating. All electrical parameters-including VWM, VBR, VC, and PPPM-are identical between the two. The SMA5J18HE3/61 is the preferred choice for automotive designs requiring validated reliability.
What is the recommended PCB pad layout for the SMA5J18HE3/61?
Vishay specifies mounting the SMA5J18HE3/61 on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 500 W surge performance. Smaller pads reduce thermal dissipation and surge current capability. The DO-214AC (SMA) outline requires 4.93 mm length and 3.99 mm width clearance; solder mask defined pads are recommended to prevent bridging. The SMA5J18HE3/61 thermal resistance drops from 80 °C/W (junction-to-ambient) to ~25 °C/W (junction-to-lead) with proper pad design.
Does the SMA5J18HE3/61 have bidirectional capability?
No, the SMA5J18HE3/61 is a unidirectional TVS diode, indicated by the "A" suffix (vs. "CA" for bidirectional). It conducts only in reverse bias above VBR; forward conduction follows standard silicon diode behavior (VF ≈ 3.5 V at 25 A). For bidirectional protection, select SMA5J18CAHE3/61 instead. The SMA5J18HE3/61 polarity is marked by a cathode band and must be oriented with cathode toward the protected line.
SMA5J18HE3/61 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA5J18HE3/61 FAQ
1.How can I place an order for SMA5J18HE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J18HE3/61 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 SMA5J18HE3/61 reliable?
The price and inventory of SMA5J18HE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J18HE3/61 is usually 5 days.
3.What payment methods are accepted for SMA5J18HE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J18HE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J18HE3/61?
SMA5J18HE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J18HE3/61 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 SMA5J18HE3/61?
For technical support, including SMA5J18HE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J18HE3/61 requirements.
6.How does Aetrix verify that SMA5J18HE3/61 is sourced from the original manufacturer or authorized distributors?
All SMA5J18HE3/61 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 SMA5J18HE3/61 meets industry standards.
7.What is the process for return or replacement of SMA5J18HE3/61?
All SMA5J18HE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J18HE3/61, 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 SMA5J18HE3/61 part is unused and in its original packaging.
Return procedure for SMA5J18HE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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