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Vishay General Semiconductor - Diodes Division SMB8J30CAHM3_B/I
- Part No.:
- SMB8J30CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J30CAHM3_B/I.pdf
- Description:
- 800W,30V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,154
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Product details
Overview
SMB8J30CAHM3_B/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 30 V stand-off voltage (VWM), 48.4 V maximum clamping voltage (VC) at 16.5 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 μs waveform - suitable for automotive sensor interface and industrial I/O port protection.
For engineers reviewing the SMB8J30CAHM3_B/I datasheet, SMB8J30CAHM3_B/I pinout, SMB8J30CAHM3_B/I application, or SMB8J30CAHM3_B/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low thermal resistance (RθJL = 20 °C/W), and compatibility with automated SMT placement on standard 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior, while the bidirectional configuration enables symmetric suppression of positive and negative surges without polarity sensitivity.
The device is rated for -55 °C to +150 °C operating junction temperature and meets J-STD-020 MSL Level 1 (260 °C peak reflow). Its 72 °C/W junction-to-ambient thermal resistance requires careful PCB pad design - minimum 0.2" × 0.2" copper per terminal - to sustain repetitive surge duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse working voltage before clamping activation |
| VBR (min/max) | 33.3 V / 36.8 V - breakdown occurs within this range at 1.0 mA test current |
| VC @ IPPM | 48.4 V - clamps transients to ≤48.4 V when subjected to 16.5 A 10/1000 μs surge |
| PPPM | 800 W - peak pulse power handling capability under standardized surge waveform |
| ID @ VWM | 1.0 μA - ultra-low leakage ensures minimal impact on signal integrity at 30 V bias |
| TJ max. | +150 °C - supports operation in under-hood automotive and industrial environments |
| RθJL | 20 °C/W - low junction-to-lead thermal resistance enables efficient heat transfer to PCB |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. No polarity marking - bidirectional device.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; no cathode band - bidirectional clamping across either polarity |
| Case (body) | Thermal and mechanical interface | Non-electrical; provides mechanical anchoring and thermal conduction to PCB copper pads |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = 1.45) and higher energy absorption efficiency |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing at 260 °C peak without moisture damage |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
| Halogen-free construction | Complies with IPC-4101D/93 and EU Directive 2011/65/EU Annex II for green electronics manufacturing |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point, clamping surges before reaching downstream ASICs. Use Value: Maintains signal fidelity below 30 V DC bias while limiting transient excursions to ≤48.4 V - preserving input stage integrity of 5 V or 3.3 V sensor interfaces. | Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges during maintenance or lightning-induced ground potential differences. IC Role / Device Role / Timing Role: Bidirectional front-end clamp on 24 V DC input channels, absorbing ±1 kV/500 A transients defined in IEC 61000-4-5. Use Value: Delivers 800 W peak power handling with 16.5 A IPPM - sufficient to meet Level 4 surge immunity without derating at elevated ambient temperatures. |
| Telecom Line Card Protection | Consumer Appliance Motor Control |
Use Scenario: Shielding Ethernet PHYs and PoE injectors from induced surges on twisted-pair data lines exposed to building-wide EMI sources. IC Role / Device Role / Timing Role: Secondary-level TVS placed after primary gas discharge tube (GDT), providing fast-response clamping for residual transients. Use Value: 48.4 V VC ensures safe margin below 57 V PoE Class 8 maximum voltage - preventing latch-up in IEEE 802.3bt compliant circuits. | Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines and HVAC blowers connected to microcontroller GPIOs. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) bidirectional clamp across motor driver enable/control lines. Use Value: 1.0 μA ID at 30 V minimizes standby current draw - critical for battery-backed control logic in smart appliances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J30CAHE3_B/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks HM3 suffix | Approved for commercial-grade automotive modules where halogen-free requirement is waived | Select when cost sensitivity outweighs halogen-free compliance needs |
| SMAJ30CA-M3/5B | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VC | Suitable for space-constrained consumer designs with lower surge exposure (IEC 61000-4-2 Level 3) | Choose for non-automotive applications requiring footprint reduction and reduced surge margin |
Compared with SMB8J30CAHM3_B/I, the HE3 variant trades halogen-free status for slightly lower cost, while the SMAJ30CA-M3/5B sacrifices 50 % surge power rating and thermal robustness for 30 % smaller board area - making SMB8J30CAHM3_B/I optimal for AEC-Q101–mandated, high-reliability 800 W surge zones.
Availability
SMB8J30CAHM3_B/I is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O modules, telecom line card development, and consumer appliance motor control systems requiring stable component supply and long-term lifecycle support.
Supply support for SMB8J30CAHM3_B/I 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, power density, and automotive qualification.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® high-power TVS family, engineered specifically for AEC-Q101–compliant surge protection in harsh automotive and industrial environments where bidirectional clamping and thermal stability are critical.
FAQ
What is the clamping voltage of SMB8J30CAHM3_B/I at its rated peak pulse current?
The SMB8J30CAHM3_B/I has a maximum clamping voltage (VC) of 48.4 V when subjected to its rated peak pulse current (IPPM) of 16.5 A under the 10/1000 μs waveform condition. This value is measured per ANSI/IEEE C62.35 standards and guarantees predictable voltage limiting during surge events - essential for protecting 3.3 V or 5 V logic interfaces downstream.
Is SMB8J30CAHM3_B/I suitable for automotive applications?
Yes, SMB8J30CAHM3_B/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction meeting automotive reliability requirements. It is explicitly rated for -55 °C to +150 °C junction temperature and validated for temperature cycling, highly accelerated life testing (HALT), and ESD robustness - making it appropriate for engine control units, body electronics, and ADAS sensor modules.
How does the bidirectional configuration of SMB8J30CAHM3_B/I affect circuit layout?
The SMB8J30CAHM3_B/I has no polarity marking and functions identically in either orientation, eliminating need for orientation-aware placement or silkscreen indicators. This simplifies PCB layout for differential or AC-coupled lines - such as RS-485, CAN, or audio paths - where transient polarity is unpredictable. Layout must still follow Vishay's recommended 0.2" × 0.2" copper pad per terminal for thermal performance.
What is the leakage current specification for SMB8J30CAHM3_B/I at its stand-off voltage?
At its 30 V stand-off voltage (VWM), the SMB8J30CAHM3_B/I exhibits a maximum reverse leakage current (ID) of 1.0 μA at 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor bias networks and minimizes quiescent power loss in battery-operated systems - confirmed per the manufacturer's electrical characteristics table in Document Number 88422.
Does SMB8J30CAHM3_B/I require derating at elevated ambient temperatures?
Yes, SMB8J30CAHM3_B/I must be derated above TA = 25 °C per Figure 2 in the datasheet. Its peak pulse power drops linearly to ~50 % at +100 °C ambient due to thermal limitations. Designers must apply the published derating curve and ensure adequate copper pad area (0.2" × 0.2") and airflow to maintain junction temperature ≤150 °C during repetitive surge events.
SMB8J30CAHM3_B/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 30V
- Current - Peak Pulse (10/1000µs):
- 16.5A
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J30CAHM3_B/I FAQ
1.How can I place an order for SMB8J30CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J30CAHM3_B/I 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 SMB8J30CAHM3_B/I reliable?
The price and inventory of SMB8J30CAHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J30CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMB8J30CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J30CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J30CAHM3_B/I?
SMB8J30CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J30CAHM3_B/I 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 SMB8J30CAHM3_B/I?
For technical support, including SMB8J30CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J30CAHM3_B/I requirements.
6.How does Aetrix verify that SMB8J30CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMB8J30CAHM3_B/I 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 SMB8J30CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMB8J30CAHM3_B/I?
All SMB8J30CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J30CAHM3_B/I, 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 SMB8J30CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMB8J30CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J30CAHM3_B/I Tags
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