My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ18CHE3/52
;;2.jpg)
- Part No.:
- SMBJ18CHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CHE3/52.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,522
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ18CHE3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. 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 dissipation with a 10/1000 µs waveform.
For engineers reviewing the SMBJ18CHE3/52 datasheet, SMBJ18CHE3/52 pinout, SMBJ18CHE3/52 application, or SMBJ18CHE3/52 equivalent, this device is selected for robust overvoltage protection on DC power rails, MOSFET gate drivers, and sensor signal lines in industrial motor controls, automotive body electronics, and telecom interface circuits where AEC-Q101 qualification and low clamping voltage are critical.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, conducting only in reverse bias above its breakdown threshold while presenting high impedance below VWM. Its glass-passivated junction ensures stable leakage performance (<1.0 µA at 18 V) and fast response time (<1.0 ps), enabling effective suppression of sub-nanosecond transients.
The device is rated for 150 °C maximum junction temperature and exhibits a positive temperature coefficient of VBR (+0.092 %/°C), supporting predictable derating across operating temperatures. Thermal resistance from junction-to-lead is 20 °C/W, allowing reliable operation under repetitive surge conditions when mounted on standard 5.0 mm × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 18 V - Maximum continuous reverse working voltage before significant conduction begins; defines safe operating margin for 15–18 V DC rails. |
| VBR (Breakdown Voltage) | 20.0–22.1 V at 1 mA - Tight tolerance ensures consistent triggering across production lots; enables precise coordination with downstream IC overvoltage thresholds. |
| VC (Clamping Voltage) | 29.2 V at 20.5 A - Limits transient voltage seen by protected circuitry during 600 W surge events; critical for safeguarding 24 V logic and gate drivers. |
| IPPM (Peak Pulse Current) | 20.5 A with 10/1000 µs waveform - Quantifies maximum surge energy absorption capability per event; supports IEC 61000-4-5 Level 4 compliance when properly laid out. |
| PPPM (Peak Pulse Power) | 600 W - Sustains high-energy transients without failure; validated under repetitive 0.01 % duty cycle conditions. |
| TJmax | 150 °C - Enables use in under-hood automotive and industrial environments with elevated ambient temperatures. |
| Package | SMB (DO-214AA) - Surface-mount footprint compatible with automated assembly; meets UL 94 V-0 flammability and J-STD-020 MSL Level 1. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by band marking on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (cathode-biased in protection mode) | Connected to ground or low-impedance return path; forms clamping loop with cathode to shunt surge current away from protected node. |
| Cathode | Reverse-biased terminal during normal operation | Connected to protected line (e.g., 18 V rail); avalanche breakdown initiates here when transient exceeds VBR, diverting current to anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including body control modules and infotainment power supplies; supports PPAP documentation requirements. |
| 600 W peak pulse power | Withstands high-energy transients from relay coil flyback or ESD coupling without degradation; tested per IEC 61000-4-5 waveform. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage stress on protected ICs; improves margin versus 24 V system-level immunity targets. |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free reflow assembly without moisture-related popcorn failure or delamination. |
| Glass passivated junction | Ensures stable leakage current (<1.0 µA at VWM) and long-term reliability under thermal cycling and humidity exposure. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate driver ICs and microcontroller I/O pins from inductive kickback generated by solenoid and relay coils in HVAC actuators and window lift systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between gate driver output and ground to clamp negative-going transients and prevent latch-up or oxide damage. Use Value: Clamps 29.2 V at 20.5 A, limiting stress on 3.3 V/5 V logic interfaces and ensuring >100,000-cycle reliability under real-world switching loads. |
Use Scenario: Input rail protection for LIN bus transceivers and LED driver ICs powered from vehicle battery (12 V nominal, up to 16 V). IC Role / Device Role / Timing Role: Standoff-rated TVS on 18 V auxiliary supply rail, absorbing load dump spikes and jump-start transients per ISO 7637-2 Pulse 5a. Use Value: AEC-Q101 qualification and 150 °C rating ensure functional safety compliance in under-dash environments with no derating required up to 125 °C ambient. |
| Telecom Interface Circuits | Consumer Sensor Signal Lines |
|
Use Scenario: Surge protection on RS-485 data lines and DC power inputs of base station remote units exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary front-end clamp on 18 V bias rail feeding isolated RS-485 transceivers, coordinated with secondary GDT or MOV stages. Use Value: 600 W pulse rating and 29.2 V clamping enable coordination with 30 V-rated transceivers, meeting Telcordia GR-1089 Class B immunity requirements. |
Use Scenario: ESD and transient protection for analog outputs of MEMS pressure sensors and Hall-effect current sensors in smart home appliances. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA) unidirectional TVS on 18 V sensor excitation line, preventing false readings and offset drift during electrostatic discharge events. Use Value: Glass-passivated junction maintains <1 µA leakage at 18 V, avoiding measurement errors in µA-level sensor bias currents and preserving ADC accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18AHE3/52 | Same electrical specs and AEC-Q101 qualification; differs only in revision code (no functional change). | No difference in application scope or layout compatibility. | Select SMBJ18AHE3/52 if legacy design documentation references that exact suffix; otherwise SMBJ18CHE3/52 is functionally identical. |
| SMAJ18AHE3/A | Lower peak pulse power (400 W vs. 600 W); SMA package (DO-214AC) with smaller footprint and higher thermal resistance (RθJA = 140 °C/W). | Not recommended for high-surge industrial or automotive applications; suitable only for low-energy consumer-grade protection. | Choose SMBJ18CHE3/52 over SMAJ18AHE3/A when 600 W surge handling, lower clamping voltage, or AEC-Q101 compliance is required. |
Compared with SMBJ18AHE3/52, SMBJ18CHE3/52 offers identical performance but reflects updated internal manufacturing traceability; compared with SMAJ18AHE3/A, it delivers 50 % higher surge power handling, 20 % lower clamping voltage, and automotive-grade qualification-making it the preferred choice for mission-critical 18 V rail protection.
Availability
SMBJ18CHE3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom interface circuits requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant surge protection.
Supply support for SMBJ18CHE3/52 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was developed to deliver high-power, low-clamping transient protection in compact surface-mount packages for automotive, industrial, and communications systems where space, thermal performance, and qualification rigor are critical.
FAQ
What is the clamping voltage of SMBJ18CHE3/52 and how does it affect circuit protection?
The SMBJ18CHE3/52 has a maximum clamping voltage (VC) of 29.2 V at 20.5 A peak pulse current with a 10/1000 µs waveform. This value defines the highest voltage imposed on the protected circuit during a surge event. Because SMBJ18CHE3/52 clamps at 29.2 V-well below typical 30–36 V absolute maximum ratings of 24 V-rated ICs-it prevents destructive overvoltage stress while maintaining functional integrity. The low VC/VBR ratio (~1.4) further confirms efficient energy diversion without excessive overshoot.
Is SMBJ18CHE3/52 suitable for automotive applications?
Yes, SMBJ18CHE3/52 is AEC-Q101 qualified and explicitly designated for automotive use with ordering code suffix "HE3". It operates reliably from –55 °C to +150 °C junction temperature and meets stringent requirements for under-hood and cabin-mounted ECUs. Its 600 W surge rating, low clamping voltage, and MSL Level 1 reflow compatibility make SMBJ18CHE3/52 appropriate for protecting LIN transceivers, LED drivers, and microcontroller power rails in body control modules and ADAS subsystems.
How does SMBJ18CHE3/52 differ from non-AEC-Q101 versions like SMBJ18A-E3/52?
SMBJ18CHE3/52 includes full AEC-Q101 qualification testing (including temperature cycling, HTRB, and ESD), extended temperature validation, and enhanced process controls for automotive production. In contrast, SMBJ18A-E3/52 is commercial-grade only, lacking automotive reliability documentation and not approved for PPAP submission. Both share identical electrical parameters and SMB package, but SMBJ18CHE3/52 is the only version authorized for safety-critical automotive designs where qualification evidence is mandatory.
What is the meaning of the "HE3" suffix in SMBJ18CHE3/52?
The "HE3" suffix in SMBJ18CHE3/52 indicates RoHS-compliant construction with AEC-Q101 qualification and halogen-free molding compound. "H" denotes AEC-Q101 qualification, "E3" specifies RoHS compliance and commercial temperature grade (–55 °C to +150 °C), and the absence of "M" means it is not halogen-free beyond RoHS requirements-though Vishay confirms all HE3 parts meet halogen-free standards per IEC 61249-2-21. This suffix ensures traceability to qualified automotive lots.
Can SMBJ18CHE3/52 be used in bidirectional configurations?
No, SMBJ18CHE3/52 is a unidirectional TVS diode, intended for DC rail protection where polarity is fixed. Bidirectional operation requires a part with "CA" suffix (e.g., SMBJ18CA). Using SMBJ18CHE3/52 on AC or floating lines would result in forward conduction during half-cycles, causing failure. For bidirectional surge protection at 18 V standoff, select SMBJ18CHE3/52's counterpart SMBJ18CAHE3/52-which provides symmetrical clamping in both directions and identical 600 W rating.
SMBJ18CHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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)
SMBJ18CHE3/52 FAQ
1.How can I place an order for SMBJ18CHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CHE3/52 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 SMBJ18CHE3/52 reliable?
The price and inventory of SMBJ18CHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18CHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ18CHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CHE3/52?
SMBJ18CHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CHE3/52 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 SMBJ18CHE3/52?
For technical support, including SMBJ18CHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CHE3/52 requirements.
6.How does Aetrix verify that SMBJ18CHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ18CHE3/52 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 SMBJ18CHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ18CHE3/52?
All SMBJ18CHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CHE3/52, 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 SMBJ18CHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ18CHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CHE3/52 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
