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Vishay General Semiconductor - Diodes Division SMBJ18A-M3/52
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- Part No.:
- SMBJ18A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18A-M3/52.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,697
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Product details
Overview
SMBJ18A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection of DC power rails and signal lines. It features a 18 V standoff voltage (VWM), 20.0–22.1 V breakdown range (VBR at 1 mA), 29.2 V maximum clamping voltage (VC) at 20.5 A peak pulse current, and 600 W peak pulse power rating per 10/1000 µs waveform - deployed in industrial motor drives, automotive body control modules, and industrial sensor interfaces.
For engineers reviewing the SMBJ18A-M3/52 datasheet, SMBJ18A-M3/52 pinout, SMBJ18A-M3/52 application, or SMBJ18A-M3/52 equivalent, this page delivers verified package dimensions, clamping performance under surge conditions, thermal resistance data, RoHS/halogen-free compliance status, and direct alternative part comparisons for ESD and lightning transient protection design.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, optimized for fast response (<1 ps) to transient events such as inductive switching spikes and ESD. Its glass-passivated junction ensures stable leakage behavior and low incremental surge resistance (Rdyn ≈ 0.47 Ω derived from ΔVC/ΔIPPM).
Rated for -55 °C to +150 °C junction temperature, it delivers 5.0 W steady-state power dissipation on infinite heatsink at 50 °C ambient and exhibits 100 °C/W junction-to-ambient thermal resistance (RθJA) on standard 0.2" × 0.2" copper pads - enabling reliable operation in thermally constrained PCB layouts without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line voltage. |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above normal operating voltage. |
| VC @ IPPM | 29.2 V at 20.5 A - Clamped voltage during 10/1000 µs surge; defines worst-case stress on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling capability; supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity. |
| IFSM | 100 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against accidental polarity reversal. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive and high-temperature industrial enclosures. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient on standard pad layout; informs derating requirements above 25 °C ambient. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow). Cathode identified by molded band on case end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; carries full surge current during clamping event. |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V rail); reverse-biased during normal operation; conducts when Vin exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validated for IEC 61000-4-5 surge testing up to 1 kV open-circuit voltage with 2 Ω source impedance. |
| 29.2 V clamping voltage at 20.5 A | Limits voltage overshoot on 12 V systems to safe levels for 15 V-rated logic and power management ICs. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and EU Directive 2015/863 (RoHS 3) Annex II. |
| MSL Level 1 moisture sensitivity | Enables standard SMT assembly without dry-pack or baking; compatible with J-STD-020 profile up to 260 °C peak. |
| 100 A IFSM (8.3 ms) | Withstands accidental reverse-bias surges common in battery-connected systems during jump-start or load dump. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects microcontroller GPIO and CAN transceiver power pins from load dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between 12 V supply rail and ground, upstream of LDO regulators. Use Value: Limits rail voltage to ≤29.2 V during 100 V/500 ms load dump events, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V logic. |
Use Scenario: Shields 24 V digital input optocoupler circuits from field-wiring induced surges (IEC 61000-4-4 EFT, IEC 61000-4-5 surge). IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V input line prior to series current-limiting resistor and opto-LED. Use Value: Clamps 4 kV/500 Ω surge to <30 V within <1 ns, ensuring optocoupler LED remains within safe forward conduction limits. |
| Consumer Appliance Motor Drive Board | Telecom Power Supply Front-End |
Use Scenario: Guards MCU reset line and H-bridge gate driver supplies against inductive kickback from brushed DC motors. IC Role / Device Role / Timing Role: Localized TVS on 5 V or 3.3 V logic rails adjacent to motor driver ICs. Use Value: Suppresses >100 V transients generated during MOSFET turn-off, maintaining MCU reset integrity and preventing false triggering. |
Use Scenario: Provides secondary-level surge suppression on 48 V telecom rectifier output, complementing primary MOV-based protection. IC Role / Device Role / Timing Role: Fast-response clamping device across DC output bus to protect downstream DC-DC converters. Use Value: Delivers sub-100 ns response to fast-rising transients, reducing let-through energy by >85% compared to slower MOV-only solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-E3/52 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3 suffix). | Acceptable where halogen-free requirement is not mandated (e.g., non-automotive commercial equipment). | Select when cost optimization is prioritized and halogen-free certification is not required by end-customer spec. |
| SMAJ18A-M3 | Lower 400 W PPPM, higher VC = 32.4 V at 12.4 A; SMA package (smaller footprint, higher RθJA = 140 °C/W). | Suitable only for lower-energy transients (e.g., IEC 61000-4-2 ESD) or space-constrained designs where 600 W margin is unnecessary. | Choose only if board area is critical and surge threat level is limited to ESD or low-energy switching noise. |
Compared with SMBJ18A-M3/52, the E3 variant offers identical protection performance at lower cost but lacks halogen-free compliance, while the SMAJ18A-M3 sacrifices 33% pulse power headroom and thermal robustness for smaller size - making SMBJ18A-M3/52 the optimal choice for industrial and automotive applications demanding full 600 W IEC 61000-4-5 compliance and AEC-Q101 readiness.
Availability
SMBJ18A-M3/52 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, consumer appliance motor controls, and telecom power supply front-ends requiring stable component supply, halogen-free compliance, and IEC 61000-4-5 surge immunity.
Supply support for SMBJ18A-M3/52 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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and AEC-Q qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping performance and long-term stability under thermal cycling are critical.
FAQ
What is the maximum clamping voltage of SMBJ18A-M3/52 under surge conditions?
The SMBJ18A-M3/52 has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current of 20.5 A using the standardized 10/1000 µs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ18A-M3/52 maintains this clamping performance across its specified operating temperature range of -55 °C to +150 °C.
Is SMBJ18A-M3/52 suitable for automotive applications?
Yes, SMBJ18A-M3/52 is qualified to AEC-Q101 when ordered with HM3 suffix (e.g., SMBJ18A-HM3_X); however, the M3 suffix alone indicates halogen-free RoHS compliance but not AEC-Q101 qualification. For automotive use, confirm ordering code includes "HM3" and revision suffix (e.g., HM3_A), and verify compliance documentation. The SMBJ18A-M3/52 shares identical electrical characteristics with its AEC-Q101 variant, differing only in qualification testing and traceability.
What does the "/52" in SMBJ18A-M3/52 signify?
The "/52" in SMBJ18A-M3/52 denotes the preferred packaging configuration: 7" diameter plastic tape and reel, with a base quantity of 750 units per reel. This format is optimized for high-speed automated SMT placement. The "M3" suffix confirms halogen-free, RoHS-compliant construction, while "/52" specifies mechanical packaging - distinct from "/5B" (13" reel, 3200 units) or "/H" (7" reel with AEC-Q101 qualification).
How does SMBJ18A-M3/52 compare to bidirectional variants like SMBJ18CA?
The SMBJ18A-M3/52 is unidirectional and intended for DC line protection with defined polarity (cathode band), whereas SMBJ18CA is bidirectional and used for AC or floating signal line protection. Electrically, SMBJ18CA has symmetric breakdown in both directions and double the leakage current limit (per note 3 in datasheet), but identical VBR, VC, and PPPM. The SMBJ18A-M3/52 cannot substitute for SMBJ18CA in AC-coupled applications due to polarity dependence and asymmetric conduction behavior.
What is the thermal resistance of SMBJ18A-M3/52, and how does it affect layout?
The SMBJ18A-M3/52 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 standard FR-4 PCB with no internal planes. To maintain TJ ≤ 150 °C at full 5.0 W steady-state dissipation, ambient temperature must be kept below 100 °C - or copper area increased, thermal vias added, or power derated per Figure 2 in the datasheet. Layout directly impacts sustained surge repetition capability.
SMBJ18A-M3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ18A-M3/52 FAQ
1.How can I place an order for SMBJ18A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18A-M3/52 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 SMBJ18A-M3/52 reliable?
The price and inventory of SMBJ18A-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18A-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ18A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18A-M3/52?
SMBJ18A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18A-M3/52 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 SMBJ18A-M3/52?
For technical support, including SMBJ18A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18A-M3/52 requirements.
6.How does Aetrix verify that SMBJ18A-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ18A-M3/52 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 SMBJ18A-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ18A-M3/52?
All SMBJ18A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18A-M3/52, 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 SMBJ18A-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ18A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18A-M3/52 Tags
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