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Vishay General Semiconductor - Diodes Division SMB8J18C-E3/5B
- Part No.:
- SMB8J18C-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J18C-E3/5B.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,031
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Product details
Overview
SMB8J18C-E3/5B from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection on signal and power lines. It features 18 V stand-off voltage (VWM), 29.2 V clamping voltage (VC) at 27.4 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J18C-E3/5B datasheet, SMB8J18C-E3/5B pinout, SMB8J18C-E3/5B application, or SMB8J18C-E3/5B equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, low thermal resistance (RθJL = 20 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling robust protection against ESD, lightning-induced transients, and inductive switching spikes without polarity sensitivity. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM = 18 V), while MSL Level 1 rating supports lead-free reflow up to 260 °C peak.
The device delivers 29.2 V clamping voltage under 27.4 A 10/1000 µs surge, limiting voltage overshoot to safe levels for downstream ICs such as CAN transceivers or microcontroller GPIOs. Thermal resistance of 72 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead) enables reliable power dissipation in compact PCB layouts with minimal copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal line bias range. |
| VBR min/max | 20.0 V / 22.1 V at 1.0 mA - verified breakdown threshold ensures consistent turn-on during transients. |
| VC @ IPPM | 29.2 V at 27.4 A - clamping voltage limits stress on protected circuitry during 10/1000 µs surge events. |
| PPPM | 800 W - peak pulse power handling capacity per 10/1000 µs waveform, critical for automotive load-dump immunity. |
| ID @ VWM | <1.0 µA - ultra-low reverse leakage preserves signal integrity and battery life in always-on systems. |
| TJ max | 150 °C - maximum junction temperature supports operation in under-hood automotive environments. |
| RθJL | 20 °C/W - low junction-to-lead thermal resistance enables efficient heat transfer to PCB copper pads. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band omitted (bi-directional configuration). Matte tin-plated leads meet J-STD-002 solderability and JESD22-B102 reliability standards. Molding compound complies with UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional transient conduction path | No polarity marking; terminals interchangeable - simplifies layout and eliminates orientation errors in automated assembly. |
| Cathode Band (absent) | Polarity indicator (not applicable) | Confirms bi-directional functionality; no color band required per datasheet specification for "C" suffix parts. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces. |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns. |
| Glass passivated junction | Ensures stable VBR over lifetime and improved resistance to humidity and contamination. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a). |
| UL 94 V-0 molding compound | Meets flame-retardancy requirements for industrial and transportation equipment safety certifications. |
Applications
| Automotive Sensor Protection | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and temperature/pressure sensors exposed to load dump and jump-start conditions in vehicle cabins. IC Role / Device Role / Timing Role: Bi-directional clamping element placed between sensor signal line and ground, responding within <1 ns to transients exceeding 18 V. Use Value: Limits voltage to ≤29.2 V during 800 W surges, preventing latch-up or gate oxide damage in 3.3 V/5 V interface ICs. |
Use Scenario: Safeguarding PLC digital input modules connected to 24 V DC field wiring subject to inductive kickback from solenoids and relays. IC Role / Device Role / Timing Role: Standoff protector on each channel's input node, conducting only during >18 V excursions while remaining invisible during normal operation. Use Value: Enables reliable operation with <1.0 µA leakage at 18 V, minimizing false triggering and preserving signal fidelity in noise-sensitive control logic. |
| Telecom Line Interface | Consumer USB Port ESD Protection |
|
Use Scenario: Shielding RS-485 transceivers in base station backhaul links from lightning-induced common-mode surges on twisted-pair cables. IC Role / Device Role / Timing Role: Paired bi-directional TVS across differential pair (A–B), clamping mode-switching transients before they reach receiver inputs. Use Value: Delivers 29.2 V clamping at 27.4 A, maintaining signal integrity under IEC 61000-4-5 Level 4 (4 kV) surge tests. |
Use Scenario: Front-end protection for USB 2.0 data lines (D+/D−) in portable media players subjected to human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Low-capacitance bi-directional clamp placed directly at connector, shunting >8 kV HBM discharges to ground. Use Value: Achieves sub-nanosecond response with no polarity dependency, eliminating need for dual unidirectional devices and reducing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | Same VWM (18 V) and VC (29.2 V), but rated for 1000 W PPPM (uni-directional only); lacks AEC-Q101 qualification. | Restricted to commercial-grade non-automotive use due to absence of AEC-Q101 validation. | Select when higher 1000 W uni-directional surge margin is needed and automotive qualification is not required. |
| SMCJ18CA | Same VWM and bi-directionality, but larger DO-214AB (SMC) package; 1500 W PPPM rating and lower RθJA (35 °C/W). | Requires larger PCB footprint and different pad layout; suited for higher-power industrial systems with thermal constraints. | Choose when system-level surge requirements exceed 800 W and board space permits larger SMC package. |
Compared with SMBJ18CA and SMCJ18CA, SMB8J18C-E3/5B uniquely balances AEC-Q101 compliance, bi-directional symmetry, and compact SMB footprint - making it optimal for space-constrained automotive and industrial edge nodes where polarity-agnostic protection and process reliability are mandatory.
Availability
SMB8J18C-E3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line drivers, and consumer USB port protection requiring stable component supply and full traceability.
Supply support for SMB8J18C-E3/5B 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 and automotive-grade qualification.
The SMB8J series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where AEC-Q101 compliance and repeatable clamping performance are essential.
FAQ
What does the "C" suffix in SMB8J18C-E3/5B indicate?
The "C" suffix denotes bi-directional configuration - meaning SMB8J18C-E3/5B has symmetrical breakdown characteristics in both forward and reverse directions, with no cathode marking. This distinguishes it from unidirectional variants like SMB8J18A-E3/5B, which feature a cathode band and conduct only in one direction. The bi-directional design simplifies layout and eliminates polarity concerns in AC-coupled or differential signal paths.
Is SMB8J18C-E3/5B qualified for automotive applications?
Yes, SMB8J18C-E3/5B is AEC-Q101 qualified per the Vishay datasheet (Document Number: 88422, Revision: 12-Nov-12). This certification confirms its suitability for automotive electronic systems, including engine control, body electronics, and ADAS sensor interfaces, where reliability under temperature cycling, mechanical shock, and long-term operational stress is mandatory.
What is the clamping voltage of SMB8J18C-E3/5B under surge conditions?
The maximum clamping voltage (VC) of SMB8J18C-E3/5B is 29.2 V at 27.4 A peak pulse current (IPPM), tested with a 10/1000 µs waveform. This value represents the upper limit of voltage seen by protected circuitry during standardized surge events and is critical for ensuring downstream components - such as 3.3 V or 5 V microcontrollers - remain within safe operating limits.
Does SMB8J18C-E3/5B require special PCB layout considerations?
Yes - SMB8J18C-E3/5B should be mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 800 W pulse power dissipation. Smaller pads reduce thermal mass and increase junction temperature, derating surge capability. The DO-214AA (SMB) footprint must follow Vishay's specified pad dimensions (0.155" × 0.096") to ensure solder joint reliability and thermal performance.
How does SMB8J18C-E3/5B differ from SMBJ18CA?
SMB8J18C-E3/5B is bi-directional and AEC-Q101 qualified, whereas SMBJ18CA is unidirectional and commercially rated. Both share identical VWM (18 V) and VC (29.2 V), but SMBJ18CA offers higher 1000 W PPPM (vs. 800 W) and lacks automotive qualification. SMB8J18C-E3/5B's bi-directionality and qualification make it suitable for automotive sensor lines and differential buses where polarity cannot be assumed.
SMB8J18C-E3/5B 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):
- 24.8A
- Power - Peak Pulse:
- 800W
- 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 (SMB)
SMB8J18C-E3/5B FAQ
1.How can I place an order for SMB8J18C-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J18C-E3/5B 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 SMB8J18C-E3/5B reliable?
The price and inventory of SMB8J18C-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J18C-E3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J18C-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J18C-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J18C-E3/5B?
SMB8J18C-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J18C-E3/5B 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 SMB8J18C-E3/5B?
For technical support, including SMB8J18C-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J18C-E3/5B requirements.
6.How does Aetrix verify that SMB8J18C-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J18C-E3/5B 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 SMB8J18C-E3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J18C-E3/5B?
All SMB8J18C-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J18C-E3/5B, 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 SMB8J18C-E3/5B part is unused and in its original packaging.
Return procedure for SMB8J18C-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J18C-E3/5B Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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