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Vishay General Semiconductor - Diodes Division SMBJ18CHE3/5B
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- Part No.:
- SMBJ18CHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CHE3/5B.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,709
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Product details
Overview
SMBJ18CHE3/5B from Vishay General Semiconductor is a unidirectional 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 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, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMBJ18CHE3/5B datasheet, SMBJ18CHE3/5B pinout, SMBJ18CHE3/5B application, or SMBJ18CHE3/5B equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (−55 to +150 °C), and RoHS-compliant packaging configuration for production-grade ESD and surge design-in.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping device that remains high-impedance below VWM = 18 V and rapidly transitions to low-impedance conduction above VBR = 20.0–22.1 V to divert transient energy. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and repeatable clamping performance under repetitive surge conditions.
Designed for automated SMT assembly, SMBJ18CHE3/5B meets MSL Level 1 per J-STD-020, supports 260 °C lead-free reflow, and is qualified to AEC-Q101 for automotive applications. Its 600 W peak pulse power rating applies with 10/1000 µs waveform at 0.01% duty cycle, and it exhibits a low incremental surge resistance enabling effective suppression of fast transients induced by inductive switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 18 V - Maximum continuous reverse operating voltage before significant conduction begins; defines safe operating margin for 15–18 V DC rails. |
| VBR (Breakdown Voltage) | 20.0–22.1 V at IT = 1 mA - Confirmed breakdown threshold ensuring reliable turn-on during overvoltage events without premature leakage. |
| VC (Clamping Voltage) | 29.2 V at IPPM = 20.5 A - Peak voltage seen by protected circuit during 10/1000 µs surge; guarantees downstream ICs rated ≥30 V remain within safe operating area. |
| PPPM (Peak Pulse Power) | 600 W - Sustained transient energy absorption capability under standardized 10/1000 µs waveform; enables protection against IEC 61000-4-5 Level 3 surges. |
| RθJA (Thermal Resistance) | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs derating requirements above TA = 25 °C. |
| TJmax | +150 °C - Maximum allowable junction temperature; supports operation in under-hood automotive environments and sealed industrial enclosures. |
| IFSM | 100 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against accidental polarity reversal or high-energy fault currents. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance reference plane; completes clamping loop during reverse-biased surge event. |
| Cathode | Protected line connection / transient input | Connected to line being protected (e.g., 12 V supply rail or CAN_H); conducts when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - required for engine control, ADAS, and body electronics. |
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 combination wave surges up to 1 kV/42 Ω without external series impedance. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage stress on downstream components - critical for safeguarding 24 V-rated microcontrollers and transceivers. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT processes without preconditioning or special handling - reduces manufacturing complexity and cost. |
| Glass passivated junction | Ensures stable leakage current (<1.0 µA at VWM) and long-term parameter stability across temperature and lifetime. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V power inputs in automotive body control modules (BCM) against load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery rail and DC-DC input, conducting only during positive overvoltage events. Use Value: Limits voltage to ≤29.2 V during 20.5 A surge, preventing damage to upstream regulators and MCU power supplies while maintaining AEC-Q101 compliance. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) in factory automation sensors exposed to EMI and cable coupling. IC Role / Device Role / Timing Role: Standoff-mode protector on signal path, activated only during >20 V transients to avoid signal distortion during normal operation. Use Value: Clamps induced spikes within 1 ns response time while adding <1 pF junction capacitance - preserving signal integrity up to 100 kHz bandwidth. |
| Telecom Interface Surge Suppression | Consumer Device USB Port Protection |
|
Use Scenario: Front-end protection for RS-485 transceivers in outdoor telecom base stations subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary shunt protector on differential bus lines, coordinated with common-mode chokes to meet IEC 61000-4-5 Level 4. Use Value: Absorbs 600 W transient energy without degradation, maintaining clamping performance after ≥1000 surges per JEDEC JESD22-A114. |
Use Scenario: Overvoltage guard on VBUS line of USB-C ports in portable medical monitors and handheld test equipment. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to system ground, triggered only during VBUS overvoltage (e.g., charger fault). Use Value: Withstands 100 A non-repetitive forward surge (IFSM), preventing catastrophic failure during accidental 24 V adapter misconnection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18AHE3/5B | No AEC-Q101 qualification; commercial-grade only; identical VWM, VBR, VC, and PPPM. | Not suitable for automotive or mission-critical industrial use where qualification traceability is mandated. | Select SMBJ18AHE3/5B only for cost-sensitive consumer or non-automotive embedded designs requiring same electrical specs without qualification. |
| SMAJ18AHE3/A | Lower PPPM = 400 W; SMA package (DO-214AC) with higher RθJA = 140 °C/W; same VWM/VBR range. | Limited to lower-energy transients; less effective in high-temperature or high-power-density layouts. | Choose SMAJ18AHE3/A only when board space constraints prevent SMB footprint or when 400 W surge margin is sufficient. |
Compared with SMBJ18AHE3/5B and SMAJ18AHE3/A, SMBJ18CHE3/5B uniquely combines AEC-Q101 qualification, 600 W surge capacity, and SMB thermal performance - making it the only option qualified for automotive power rail protection where both reliability and energy handling are mandatory.
Availability
SMBJ18CHE3/5B is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ18CHE3/5B 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, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ESD, EFT, and surge events is non-negotiable.
FAQ
What is the clamping voltage of SMBJ18CHE3/5B at its rated peak pulse current?
The SMBJ18CHE3/5B has a maximum clamping voltage (VC) of 29.2 V at 20.5 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per standard test methods defined in ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024. The clamping behavior ensures protected circuits experience minimal overvoltage stress during surge events, directly supporting design margins for 30 V-rated components. SMBJ18CHE3/5B maintains this specification across its qualified operating temperature range.
Is SMBJ18CHE3/5B qualified for automotive applications?
Yes, SMBJ18CHE3/5B is explicitly AEC-Q101 qualified, as indicated by the "HE3" suffix in its part number and confirmed in Vishay's ordering information table and thermal characteristics notes. This qualification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and surge endurance - validating its suitability for under-hood and chassis-mounted automotive electronics. SMBJ18CHE3/5B meets the reliability requirements for engine control, lighting modules, and ADAS subsystems where field failure is unacceptable.
What does the "5B" in SMBJ18CHE3/5B indicate?
The "5B" suffix in SMBJ18CHE3/5B specifies the packaging configuration: 13-inch diameter plastic tape and reel, with a base quantity of 3200 units per reel. This format is optimized for high-volume SMT placement using standard pick-and-place equipment. The "HE3" portion denotes RoHS-compliant construction with AEC-Q101 qualification, while "5B" is purely a packaging code - distinct from "52" (7-inch reel, 750 units) and unrelated to electrical or thermal performance. SMBJ18CHE3/5B is fully compatible with automated assembly lines requiring J-STD-002 compliant terminations.
How does SMBJ18CHE3/5B differ from SMBJ18AHE3/5B?
SMBJ18CHE3/5B and SMBJ18AHE3/5B share identical electrical specifications - including VWM = 18 V, VBR = 20.0–22.1 V, VC = 29.2 V, and PPPM = 600 W - but differ in qualification status. Only SMBJ18CHE3/5B carries AEC-Q101 certification, verified via Vishay's documented qualification report referenced in the datasheet. SMBJ18AHE3/5B is commercial-grade only. For automotive or safety-critical industrial use, SMBJ18CHE3/5B is mandatory; SMBJ18AHE3/5B may be selected solely for cost-driven non-automotive applications where qualification is not required.
What is the maximum operating temperature for SMBJ18CHE3/5B?
The SMBJ18CHE3/5B has a specified operating junction temperature range of −55 °C to +150 °C, with storage temperature matching this span. This wide range supports deployment in extreme environments such as automotive engine compartments, industrial motor drives, and outdoor telecom enclosures. Thermal derating is required above TA = 25 °C per Figure 2 in the datasheet, based on its RθJA = 100 °C/W rating on standard 0.2" × 0.2" copper pads. SMBJ18CHE3/5B maintains full electrical performance throughout this range when mounted per recommended pad layout.
SMBJ18CHE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- 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):
- 18.6A
- 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)
SMBJ18CHE3/5B FAQ
1.How can I place an order for SMBJ18CHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CHE3/5B 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 SMBJ18CHE3/5B reliable?
The price and inventory of SMBJ18CHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18CHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ18CHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CHE3/5B?
SMBJ18CHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CHE3/5B 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 SMBJ18CHE3/5B?
For technical support, including SMBJ18CHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CHE3/5B requirements.
6.How does Aetrix verify that SMBJ18CHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ18CHE3/5B 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 SMBJ18CHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ18CHE3/5B?
All SMBJ18CHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CHE3/5B, 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 SMBJ18CHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ18CHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CHE3/5B Tags
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