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Vishay General Semiconductor - Diodes Division SMBJ18AHE3/52
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- Part No.:
- SMBJ18AHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18AHE3/52.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,047
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Product details
Overview
SMBJ18AHE3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping fast-rising ESD and surge transients on power and signal lines. It features 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 29.2 V maximum clamping voltage (VC) at 20.5 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), making it suitable for protecting MOSFET gates, microcontroller I/O, and sensor interfaces in industrial motor drives.
For engineers reviewing the SMBJ18AHE3/52 datasheet, SMBJ18AHE3/52 pinout, SMBJ18AHE3/52 application, or SMBJ18AHE3/52 equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), clamping performance under 10/1000 µs surges, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device in series with sensitive downstream circuitry, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and low incremental surge resistance, enabling precise overvoltage limiting during transient events.
The SMBJ18AHE3/52 is rated for repetitive 600 W surges (duty cycle 0.01 %), with derating above 25 °C per Fig. 2, and supports peak forward surge current of 100 A (8.3 ms half-sine). Its MSL Level 1 rating (260 °C peak reflow) and matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 29.2 V at 20.5 A - Clamped voltage seen by protected IC during full-rated 10/1000 µs surge; limits stress on downstream components. |
| PPPM | 600 W - Peak pulse power handling capability under standardized 10/1000 µs waveform; determines survivability against lightning-induced surges. |
| ID @ VWM | ≤1.0 µA - Reverse leakage current at stand-off voltage; ensures minimal standby power loss and signal integrity on high-impedance lines. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial ambient environments. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs PCB thermal design for sustained power dissipation. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with cathode band marking; meets UL 94 V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to ground or low-side reference in unidirectional protection configurations; enables surge current path to earth. |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line (e.g., 18 V rail or sensor output); conducts only when line voltage exceeds VBR, shunting surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing-enables use in engine control units and ADAS sensors. |
| 600 W peak pulse power (10/1000 µs) | Withstands high-energy transients from inductive load switching (e.g., solenoid drivers) without degradation across >10⁴ cycles at 0.01 % duty. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Ensures tight voltage margin between breakdown and clamping-reduces risk of overvoltage damage to 3.3 V or 5 V logic interfaces. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow assembly without popcorn cracking or delamination-compatible with standard SMT production lines. |
| Glass passivated junction | Provides stable VBR tolerance and low leakage over lifetime-critical for long-term field reliability in industrial automation equipment. |
Applications
| Industrial Motor Drive Control | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protecting gate drivers and feedback sensing circuits from flyback voltage spikes generated by PWM-controlled BLDC motors. IC Role / Device Role / Timing Role: Unidirectional TVS placed between gate driver output and MOSFET gate, clamping negative-going transients to prevent gate oxide rupture. Use Value: Limits gate-source voltage to ≤29.2 V during 10/1000 µs surges up to 20.5 A, preserving MOSFET reliability without adding RC snubbers. |
Use Scenario: Safeguarding LIN bus transceivers and window lift motor controllers against battery dump and load-dump transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply rail upstream of LDO regulators, triggered only during >20 V overvoltage events. Use Value: Maintains 18 V nominal rail integrity while clamping 30 V+ transients within 1 ns-meets ISO 7637-2 Pulse 5a requirements. |
| Consumer Appliance Power Supply | Industrial Sensor Signal Conditioning |
|
Use Scenario: Suppressing ESD and relay-contact bounce transients on AC-DC adapter primary-side control ICs. IC Role / Device Role / Timing Role: Primary-side TVS across bulk capacitor input, absorbing 600 W surges induced by mains switching or lightning coupling. Use Value: Prevents false triggering or latch-up of PWM controllers by limiting transient overshoot to <29.2 V for durations ≤1 ms. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors from cable discharge events in factory-floor wiring harnesses. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS on 4–20 mA loop output, placed before current-sense resistor to avoid measurement offset. Use Value: Enables sub-µA baseline accuracy while surviving ±8 kV contact ESD per IEC 61000-4-2 without parameter shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18AHM3/52 | Halogen-free variant with identical electrical specs and AEC-Q101 qualification; same SMB package and pinout. | No difference in circuit function or layout; selected where halogen-free compliance is mandated (e.g., EU medical devices). | Direct material substitution when RoHS + halogen-free certification is required; no redesign needed. |
| SMCJ18AHE3/52 | Same VWM/VBR/VC specs but in larger SMC (DO-214AB) package; higher RθJA (60 °C/W) and 1500 W PPPM rating. | Better thermal performance and surge margin, but requires larger PCB footprint and may not fit space-constrained modules. | Preferred for high-reliability industrial power supplies where 1500 W surge headroom justifies added board area. |
Compared with SMBJ18AHE3/52, SMBJ18AHM3/52 offers identical protection performance with halogen-free construction, while SMCJ18AHE3/52 trades compact size for higher surge capacity and improved thermal dissipation-selection depends on footprint constraints, regulatory requirements, and worst-case surge energy expectations.
Availability
SMBJ18AHE3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, and consumer appliance power supplies requiring stable component supply with AEC-Q101 validation and RoHS compliance.
Supply support for SMBJ18AHE3/52 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for robust transient suppression in harsh environments-designed to meet automotive, industrial, and telecom surge immunity standards while supporting high-volume SMT manufacturing.
FAQ
What is the clamping voltage of SMBJ18AHE3/52 at its rated peak pulse current?
The SMBJ18AHE3/52 has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current (IPPM) of 20.5 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees the protected circuit sees no more than 29.2 V during full-rated surge events, critical for safeguarding 3.3 V or 5 V logic interfaces downstream of the SMBJ18AHE3/52.
Is SMBJ18AHE3/52 qualified for automotive applications?
Yes, SMBJ18AHE3/52 is AEC-Q101 qualified, as confirmed in Vishay's official documentation (Document Number 88392, Revision 09-Jan-2024). This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD-making SMBJ18AHE3/52 suitable for under-hood and chassis-mounted automotive systems such as body control modules and lighting drivers.
What does the "HE3" suffix indicate in SMBJ18AHE3/52?
The "HE3" suffix in SMBJ18AHE3/52 denotes a RoHS-compliant, AEC-Q101 qualified version with matte tin-plated leads. It distinguishes this variant from commercial-grade "E3" parts (RoHS only) and "HM3" parts (halogen-free + AEC-Q101). The "HE3" designation ensures both environmental compliance and automotive-grade reliability validation for the SMBJ18AHE3/52.
Can SMBJ18AHE3/52 be used in bidirectional protection circuits?
No, SMBJ18AHE3/52 is a unidirectional TVS diode, indicated by the "A" suffix (vs. "CA" for bidirectional). Its cathode band marks the polarity-sensitive terminal, and it conducts only during reverse overvoltage events. For bidirectional protection-such as AC line or data bus applications-engineers must select the SMBJ18CAHE3/52 variant instead of SMBJ18AHE3/52.
What is the thermal resistance of SMBJ18AHE3/52, and how does it affect PCB layout?
The SMBJ18AHE3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's datasheet; reducing pad area increases RθJA and risks thermal runaway during repetitive surges. Therefore, PCB layout for SMBJ18AHE3/52 must maintain specified copper land dimensions to ensure safe operation at its 5.0 W steady-state power dissipation limit.
SMBJ18AHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 20.5A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SMBJ18AHE3/52 FAQ
1.How can I place an order for SMBJ18AHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18AHE3/52 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 SMBJ18AHE3/52 reliable?
The price and inventory of SMBJ18AHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18AHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ18AHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18AHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18AHE3/52?
SMBJ18AHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18AHE3/52 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 SMBJ18AHE3/52?
For technical support, including SMBJ18AHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18AHE3/52 requirements.
6.How does Aetrix verify that SMBJ18AHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ18AHE3/52 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 SMBJ18AHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ18AHE3/52?
All SMBJ18AHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18AHE3/52, 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 SMBJ18AHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ18AHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18AHE3/52 Tags
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