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Vishay General Semiconductor - Diodes Division SMBJ18CAHE3/52
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- Part No.:
- SMBJ18CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CAHE3/52.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,732
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Product details
Overview
SMBJ18CAHE3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps transients to ≤29.2 V at 20.5 A IPPM - deployed on power rails and signal lines in industrial sensor interfaces and automotive ECUs.
For engineers reviewing the SMBJ18CAHE3/52 datasheet, SMBJ18CAHE3/52 pinout, SMBJ18CAHE3/52 application, or SMBJ18CAHE3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.45), MSL Level 1 moisture sensitivity, and compatibility with automated SMT assembly on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates symmetrically in both polarities due to its bidirectional construction, enabling protection against positive and negative transients without polarity dependency. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the low incremental surge resistance supports fast energy diversion during ESD or lightning-induced surges.
The device is rated for TJ = –55 °C to +150 °C operation and exhibits a VBR temperature coefficient of +0.092 %/°C - critical for thermal stability in under-hood automotive environments. Its 100 °C/W junction-to-ambient thermal resistance requires careful PCB pad design per Vishay's recommended 0.2" × 0.2" copper land pattern to sustain repetitive surge duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 18 V - maximum continuous reverse voltage before significant conduction begins; defines operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 20.0–22.1 V at IT = 1 mA - guaranteed conduction onset range; ensures predictable turn-on during transient events. |
| VC (Clamping Voltage) | 29.2 V at IPPM = 20.5 A (10/1000 µs) - peak voltage seen by protected circuit; determines safe voltage headroom for downstream ICs. |
| PPPM (Peak Pulse Power) | 600 W - maximum single-pulse transient energy dissipation capability; validates suitability for IEC 61000-4-5 Level 3/4 surges. |
| ID (Reverse Leakage) | ≤1.0 µA at VWM - negligible standby current; avoids power loss or false triggering in low-power sensor nodes. |
| TJ max. | +150 °C - enables deployment in high-temperature automotive and industrial enclosures without derating penalties. |
| MSL Level | Level 1 (J-STD-020) - supports standard reflow profiles up to 260 °C peak without baking or special handling. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | Transient current entry path (negative polarity) | Accepts reverse surge current during negative transients; forms one half of bidirectional conduction path. |
| Cathode (Terminal 2) | Transient current entry path (positive polarity) | Accepts forward surge current during positive transients; completes symmetrical clamping behavior. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including HTOL, TC, and ESD testing - suitable for engine control, body electronics, and ADAS modules. |
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 combination wave surges up to 4 kV (open-circuit)/2 kA (short-circuit) without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping - preserves margin for 3.3 V/5 V logic and analog front-ends. |
| Glass-passivated junction | Ensures long-term parameter stability and low leakage drift across temperature and lifetime stress conditions. |
| Matte tin-plated leads | Complies with J-STD-002 and JESD 22-B102 solderability standards - guarantees reliable reflow joint formation in high-volume SMT lines. |
Applications
| Automotive Body Control Module (BCM) | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting LIN and CAN signal lines from load dump and inductive switching transients in door module ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point, shunting surge energy to ground before reaching transceiver IC. Use Value: Maintains signal integrity under ISO 7637-2 Pulse 3a/b (±100 V/50 ns) while meeting AEC-Q101 requirements for 15-year vehicle life. |
Use Scenario: Safeguarding RS-485/CAN transceivers in factory automation PLC I/O modules exposed to motor drive noise. IC Role / Device Role / Timing Role: Low-capacitance TVS placed differential-line-to-ground to suppress common-mode surges without distorting data edges. Use Value: Clamps transients to <29.2 V within <1 ns, preventing transceiver latch-up and ensuring >1 Mbps bus reliability in noisy EMI environments. |
| Consumer Smart Home Hub | Telecom PoE-Powered Device |
Use Scenario: Shielding USB, Ethernet, and GPIO lines in voice-controlled hubs from ESD (IEC 61000-4-2 ±8 kV contact) and AC line coupling. IC Role / Device Role / Timing Role: First-line defense at board edge connectors; coordinated with secondary filtering (ferrite + capacitor) for multi-stage protection. Use Value: Sub-1 ns response time and <1 µA leakage preserve battery-backed real-time clock accuracy and low-power sleep modes. |
Use Scenario: Protecting 48 V DC input stage and Ethernet PHY of IEEE 802.3af/at-powered access points from induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on PSE-side DC input rail, sized to absorb 600 W surges without thermal runaway. Use Value: Enables compliance with UL 60950-1 and IEC 62368-1 transient immunity requirements while supporting continuous 15.4 W PoE delivery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA-M3/52 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU public infrastructure projects). | Choose SMBJ18CA-M3/52 when halogen-free bill-of-materials is required; otherwise SMBJ18CAHE3/52 offers same performance with broader supply chain availability. |
| SMCJ18CAHE3/52 | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; 1500 W PPPM rating and lower RθJA (50 °C/W). | Used where higher surge endurance or improved thermal management is needed - e.g., outdoor telecom equipment with frequent lightning exposure. | Select SMCJ18CAHE3/52 only if system-level surge testing exceeds 600 W or PCB layout allows larger footprint; SMBJ18CAHE3/52 remains optimal for space-constrained automotive modules. |
Compared with SMBJ18CA-M3/52, the SMBJ18CAHE3/52 offers identical protection performance with standard RoHS compliance, while SMCJ18CAHE3/52 trades compactness for higher surge capacity - making SMBJ18CAHE3/52 the preferred choice for AEC-Q101–required, volume-sensitive automotive and industrial designs where board space is constrained.
Availability
SMBJ18CAHE3/52 is available at Aetrix Electronics and suitable for automotive body electronics, industrial fieldbus interfaces, consumer smart home gateways, and telecom PoE-powered devices requiring stable component supply across multi-year production cycles.
Supply support for SMBJ18CAHE3/52 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and communications systems where robustness against ESD, EFT, and surge events is non-negotiable.
FAQ
What is the clamping voltage of SMBJ18CAHE3/52 at its rated peak pulse current?
The SMBJ18CAHE3/52 clamps to a maximum of 29.2 V at its specified peak pulse current (IPPM) of 20.5 A under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024 (Document Number: 88392). The clamping voltage directly defines the maximum stress imposed on protected circuitry during surge events, making it a critical parameter for interface IC survivability.
Is SMBJ18CAHE3/52 qualified for automotive applications?
Yes, SMBJ18CAHE3/52 is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet under "Mechanical Data" and "Ordering Information" sections. This qualification covers stress tests including high-temperature operating life (HTOL), temperature cycling (TC), and electrostatic discharge (HBM/MM/CDM), validating its use in automotive body control modules, infotainment systems, and ADAS sensors where long-term reliability under thermal and mechanical stress is mandatory.
What does the "HE3" suffix indicate in SMBJ18CAHE3/52?
The "HE3" suffix in SMBJ18CAHE3/52 denotes a RoHS-compliant, AEC-Q101–qualified version with matte tin-plated leads. Per Vishay's ordering nomenclature, "HE3" identifies the commercial-grade, lead-free, automotive-qualified variant - distinct from "E3" (RoHS only) and "HM3" (halogen-free + RoHS + AEC-Q101). This suffix ensures traceability to the exact qualification and plating specification required for Tier 1 automotive procurement.
How does SMBJ18CAHE3/52 differ from unidirectional SMBJ18AHE3/52?
SMBJ18CAHE3/52 is bidirectional with symmetrical clamping in both polarities and no cathode band marking, whereas SMBJ18AHE3/52 is unidirectional, marked with a cathode band and conducts only in reverse bias. Electrically, SMBJ18CAHE3/52 has identical VWM (18 V) and VC (29.2 V), but its VBR applies equally to both directions - making it suitable for AC-coupled or floating signal lines where polarity reversal is possible, unlike the unidirectional variant used on DC rails with defined ground reference.
What PCB layout guidance applies to SMBJ18CAHE3/52 for optimal thermal and surge performance?
Vishay specifies mounting SMBJ18CAHE3/52 on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 600 W pulse power and manage thermal resistance (RθJA = 100 °C/W). Traces to ground should be short and wide to minimize inductance, and the device must be placed as close as possible to the protected port. The datasheet explicitly states that derating occurs above TA = 25 °C per Figure 2, so thermal relief via internal copper planes is strongly advised for sustained surge duty cycles.
SMBJ18CAHE3/52 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ18CAHE3/52 FAQ
1.How can I place an order for SMBJ18CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CAHE3/52 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 SMBJ18CAHE3/52 reliable?
The price and inventory of SMBJ18CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ18CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CAHE3/52?
SMBJ18CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CAHE3/52 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 SMBJ18CAHE3/52?
For technical support, including SMBJ18CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CAHE3/52 requirements.
6.How does Aetrix verify that SMBJ18CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ18CAHE3/52 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 SMBJ18CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ18CAHE3/52?
All SMBJ18CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CAHE3/52, 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 SMBJ18CAHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ18CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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