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Vishay General Semiconductor - Diodes Division SMBG18CHE3/52
- Part No.:
- SMBG18CHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG18CHE3/52.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,738
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Product details
Overview
SMBG18CHE3/52 from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-215AA (SMBG) package, designed for clamping inductive switching transients and ESD events on signal/power lines. It features 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 600 W peak pulse power (10/1000 µs), <1 µA reverse leakage at VWM, and AEC-Q101 qualification for automotive electronics protection.
For engineers reviewing the SMBG18CHE3/52 datasheet, SMBG18CHE3/52 pinout, SMBG18CHE3/52 application, or SMBG18CHE3/52 equivalent, this page delivers verified electrical parameters, validated bi-directional clamping behavior, DO-215AA mechanical interface details, and direct alternatives for automotive-grade surge protection design.
Technical Context
The SMBG18CHE3/52 operates as a bi-directional avalanche diode with symmetrical clamping in both polarities, enabling robust protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance under repetitive 10/1000 µs transients.
Thermal performance is defined by RθJA = 100 °C/W (on 5.0 mm × 5.0 mm copper pads) and TJ(max) = 150 °C, supporting operation in under-hood automotive environments. The device meets MSL Level 1 per J-STD-020 and passes JESD201 Class 2 whisker testing (HE3 suffix).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - Ensures predictable turn-on within tight tolerance for reliable overvoltage thresholding |
| IPPM | 21.7 A at 10/1000 µs - Peak surge current capability matching ISO 7637-2 Pulse 1/2a/5a test levels |
| VC (clamping) | 27.6 V at IPPM - Limits downstream IC voltage stress to safe margin below typical 30 V rail limits |
| PPPM | 600 W - Sustains high-energy transients without thermal runaway under 0.01% duty cycle |
| TJ(max) | +150 °C - Enables placement near heat sources in engine control units and ADAS modules |
| Qualification | AEC-Q101 qualified - Validated for automotive reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
DO-215AA (SMBG) surface-mount package: 2-terminal, bi-directional configuration with no polarity marking; molded compound meets UL 94 V-0; matte tin-plated leads compliant with J-STD-002 and JESD22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional avalanche junction | Either terminal serves as cathode or anode depending on transient polarity - no orientation required during placement |
| Case (body) | Non-electrical mechanical interface | Thermally conductive epoxy body transfers heat to PCB copper pads; no electrical connection |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Withstands automotive load-dump and inductive kick energy without degradation across >1000 surges |
| AEC-Q101 qualification | Validated for automotive under-hood use including -55 °C to +150 °C operation and mechanical shock |
| Glass-passivated junction | Ensures long-term VBR stability and low leakage (<1 µA) after humidity exposure and thermal cycling |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without pre-baking or special handling |
| RoHS-compliant HE3 suffix | Meets JESD201 Class 2 whisker resistance for high-reliability automotive solder joints |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and CAN node power rails from battery line transients in vehicle body control modules. IC Role / Device Role / Timing Role: Bi-directional clamping element placed between VBAT and ground, absorbing ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 5a (load dump). Use Value: Clamps to 27.6 V at 21.7 A, keeping protected ICs within absolute maximum ratings while maintaining system uptime during repeated surges. |
Use Scenario: Safeguarding 4–20 mA current-loop sensor inputs in PLC analog input modules exposed to field wiring ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS shunting transient energy across differential signal pair before it reaches precision op-amp front-end. Use Value: Sub-µA leakage at 18 V ensures minimal offset error in µA-level current measurement circuits; fast response preserves signal integrity. |
| Automotive Lighting Control | Consumer Appliance Motor Drive |
Use Scenario: Suppressing back-EMF spikes from PWM-driven LED headlamp drivers in adaptive front-lighting systems (AFS). IC Role / Device Role / Timing Role: Parallel-connected TVS across MOSFET drain-source to clamp inductive flyback during high-frequency switching. Use Value: 27.6 V clamping voltage prevents MOSFET avalanche failure while allowing 24 V nominal supply headroom for dynamic headlamp dimming. |
Use Scenario: Protecting microcontroller GPIOs and gate drivers in smart home appliance motor inverters subject to user-induced cable disconnect transients. IC Role / Device Role / Timing Role: Low-capacitance bi-directional TVS on motor phase feedback lines to prevent latch-up during ESD events. Use Value: No polarity marking simplifies BOM management across uni/bi-directional variants; DO-215AA footprint supports automated placement in high-volume production. |
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 | Same VWM/VBR range but lower PPPM = 600 W (same rating), identical DO-214AA package; not AEC-Q101 qualified | Commercial-grade only; unsuitable for automotive safety-critical modules requiring AEC validation | Select SMBJ18CA only for cost-sensitive industrial or consumer designs where automotive qualification is unnecessary |
| SMAJ18A | Uni-directional variant, same VWM/VBR, PPPM = 400 W, DO-214AC (SMA) package - smaller footprint, lower power handling | Requires correct polarity orientation; insufficient for bidirectional AC-coupled signals or floating grounds | Choose SMAJ18A only when board space is constrained and circuit topology guarantees unidirectional surge direction |
Compared with SMBG18CHE3/52, SMBJ18CA offers identical clamping performance but lacks AEC-Q101 validation needed for automotive deployment, while SMAJ18A trades bidirectionality and power rating for compact size - making SMBG18CHE3/52 the sole choice for AEC-compliant, polarity-agnostic 600 W surge suppression.
Availability
SMBG18CHE3/52 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and consumer appliance motor drives requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMBG18CHE3/52 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial and automotive applications.
The SMBG series was engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, emphasizing thermal robustness, surge repeatability, and process-controlled VBR consistency.
FAQ
What is the clamping voltage of SMBG18CHE3/52 at its rated peak pulse current?
The SMBG18CHE3/52 has a maximum clamping voltage (VC) of 27.6 V at its rated peak pulse current (IPPM) of 21.7 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components remain within safe operating limits during surge events. The SMBG18CHE3/52 achieves this with low incremental surge resistance, critical for protecting sensitive automotive ICs.
Is SMBG18CHE3/52 suitable for bi-directional signal line protection?
Yes, SMBG18CHE3/52 is explicitly designed for bi-directional applications - its CA suffix denotes symmetrical breakdown characteristics in both polarities, with identical VBR min/max (20.0–22.1 V) and clamping behavior regardless of transient direction. Unlike uni-directional variants, SMBG18CHE3/52 requires no polarity marking during PCB layout, simplifying design for AC-coupled or floating interfaces such as LIN, RS-485, or sensor bridges.
Does SMBG18CHE3/52 meet automotive reliability standards?
Yes, SMBG18CHE3/52 carries the HE3 suffix, confirming AEC-Q101 qualification - including stress tests for temperature cycling, high-temperature reverse bias (HTRB), and mechanical shock. It also meets MSL Level 1 per J-STD-020 (peak reflow temperature 260 °C) and JESD201 Class 2 whisker resistance, making SMBG18CHE3/52 appropriate for engine control units, ADAS cameras, and other under-hood automotive systems.
What is the thermal resistance of SMBG18CHE3/52, and how does it affect layout?
The SMBG18CHE3/52 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 DO-215AA outline drawing. To maintain TJ ≤ 150 °C during repetitive surges, designers must allocate sufficient copper area and avoid excessive trace length - a key constraint reflected in the SMBG18CHE3/52's thermal design guidance.
How does the leakage current of SMBG18CHE3/52 impact low-power sensor circuits?
The SMBG18CHE3/52 exhibits ≤1.0 µA maximum reverse leakage current (ID) at its 18 V stand-off voltage (VWM), measured at 25 °C. This ultra-low leakage ensures negligible loading on high-impedance sensor nodes - such as thermistor dividers or bridge amplifiers - preserving measurement accuracy and battery life in always-on automotive and IoT sensor modules. The SMBG18CHE3/52 maintains this spec across its full operating temperature range (-55 °C to +150 °C).
SMBG18CHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AA, SMB Gull Wing
- 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 (SMBG)
SMBG18CHE3/52 FAQ
1.How can I place an order for SMBG18CHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG18CHE3/52 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 SMBG18CHE3/52 reliable?
The price and inventory of SMBG18CHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG18CHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBG18CHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG18CHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG18CHE3/52?
SMBG18CHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG18CHE3/52 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 SMBG18CHE3/52?
For technical support, including SMBG18CHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG18CHE3/52 requirements.
6.How does Aetrix verify that SMBG18CHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBG18CHE3/52 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 SMBG18CHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBG18CHE3/52?
All SMBG18CHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG18CHE3/52, 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 SMBG18CHE3/52 part is unused and in its original packaging.
Return procedure for SMBG18CHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG18CHE3/52 Tags
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