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Vishay General Semiconductor - Diodes Division SMB8J30CAHM3/H
- Part No.:
- SMB8J30CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J30CAHM3/H.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,389
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Product details
Overview
SMB8J30CAHM3/H 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 - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J30CAHM3/H datasheet, SMB8J30CAHM3/H pinout, SMB8J30CAHM3/H application, or SMB8J30CAHM3/H equivalent, key selection criteria include AEC-Q101 qualification, bidirectional polarity, low clamping ratio (VC/VWM = 1.61), and halogen-free RoHS compliance per HM3 suffix - critical for automotive-grade ESD/surge resilience in harsh environments.
Technical Context
This device operates as a voltage-clamped crowbar during transients, leveraging an avalanche breakdown mechanism to shunt surge energy away from downstream ICs. Its bidirectional symmetry enables protection of AC-coupled or differential lines without polarity constraints, and its 1.0 µA max reverse leakage at VWM ensures minimal standby power impact on low-current sensor circuits.
The SMB8J30CAHM3/H exhibits 72 °C/W junction-to-ambient thermal resistance (RθJA) and 20 °C/W junction-to-lead (RθJL), supporting reliable operation up to +150 °C junction temperature. Its glass-passivated chip junction and MSL Level 1 moisture sensitivity rating ensure robustness under reflow soldering and long-term field reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse operating voltage before clamping begins; defines safe working range for 24 V nominal systems. |
| VBR min/max | 33.3 V / 36.8 V - breakdown occurs within this band at 1.0 mA test current; ensures predictable turn-on margin above VWM. |
| VC @ IPPM | 48.4 V - clamps transient to ≤48.4 V at 16.5 A peak pulse current; limits stress on protected 3.3 V/5 V logic or analog front-ends. |
| PPPM | 800 W - peak pulse power handling with 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity. |
| ID @ VWM | 1.0 µA - ultra-low reverse leakage preserves signal integrity and battery life in always-on sensor nodes. |
| TJ max | +150 °C - extended junction temperature rating enables use in under-hood automotive or industrial enclosures. |
| AEC-Q101 | Qualified - validated for automotive electronics per stress test requirements including HTGB, HTRB, and temperature cycling. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated leads. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H). Mounting pad layout requires 5.0 mm × 5.0 mm copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Transient current sink (bidirectional) | No functional cathode/anode distinction in bidirectional mode; marking denotes reference end for orientation consistency during placement. |
| Anode (unmarked end) | Transient current sink (bidirectional) | Electrically symmetric with cathode; both terminals conduct equally during positive or negative surges. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, ADAS sensors, and body electronics - eliminates need for additional qualification testing. |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and supports lead-free reflow profiles up to 260 °C peak, with JESD201 Class 2 whisker resistance. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage exposure to protected circuitry - critical for safeguarding 3.3 V microcontrollers and precision analog sensors. |
| MSL Level 1 | Unlimited floor life before reflow; no baking required - simplifies SMT line logistics and reduces manufacturing cost. |
| Glass-passivated junction | Enhances long-term stability and surge endurance versus epoxy-passivated alternatives; resists degradation under repeated transient events. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN/CAN transceiver signal lines and MEMS pressure sensor outputs from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to divert surge energy before reaching PHY layer. Use Value: Maintains signal fidelity under 40 V load dump events while enabling AEC-Q101-compliant system certification without redesign. |
Use Scenario: Safeguarding PLC digital input modules against induced surges from relay coil switching and motor drive noise. IC Role / Device Role / Timing Role: Primary transient suppression element across 24 V DC input terminals, coordinated with upstream fuse and filtering. Use Value: Limits clamped voltage to 48.4 V - well below 60 V input stage rating - ensuring >2× safety margin and extended component lifetime. |
| USB 2.0 Data Line Protection | RS-485 Transceiver Port Protection |
|
Use Scenario: ESD and surge protection for USB D+/D− lines in automotive infotainment head units exposed to human-body-model (HBM) and IEC 61000-4-2 events. IC Role / Device Role / Timing Role: Low-capacitance TVS placed adjacent to USB connector to suppress fast transients without distorting 480 Mbps signaling. Use Value: Sub-1 µA leakage preserves bus termination integrity; bidirectional symmetry avoids polarity-dependent layout errors. |
Use Scenario: Protecting half-duplex RS-485 transceivers in factory automation networks from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Common-mode surge suppressor across A/B differential pair and ground, rated for 800 W common-mode pulse handling. Use Value: Clamps common-mode transients to <50 V while maintaining signal integrity - verified per IEC 61000-4-5 Ed.3 Annex B test setup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J30CAHE3/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable for commercial-automotive hybrids where halogen content is unrestricted. | Select SMB8J30CAHM3/H when full halogen-free compliance (IEC 61249-2-21) is mandated by OEM tier-1 specifications. |
| SMC8J30CAHM3 | Larger SMC (DO-214AB) package; 1500 W PPPM rating; identical VWM/VC/IPPM electrical behavior. | Better thermal performance for high-duty-cycle surge environments; requires larger PCB footprint. | Choose SMB8J30CAHM3/H for space-constrained layouts where 800 W suffices and board area is premium. |
Compared with SMB8J30CAHE3/H, the HM3 variant adds halogen-free assurance without trade-offs in surge capability or qualification; versus SMC8J30CAHM3, it trades 40% lower peak power for 35% smaller footprint - optimizing for compact, certified automotive edge nodes.
Availability
SMB8J30CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, and RS-485/USB interface surge resilience requiring stable component supply across multi-year production cycles.
Supply support for SMB8J30CAHM3/H 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-grade validation.
The SMB8J30CAHM3/H belongs to Vishay's TRANSZORB® family of high-power-density TVS diodes, engineered specifically for AEC-Q101-compliant transient suppression in automotive and industrial control systems.
FAQ
What is the clamping voltage of SMB8J30CAHM3/H at its rated peak pulse current?
The SMB8J30CAHM3/H clamps to a maximum of 48.4 V at its specified peak pulse current of 16.5 A (10/1000 µs waveform). This value is measured under standardized test conditions per ANSI/IEEE C62.35 and guarantees consistent overvoltage limiting for protected circuitry - a key parameter verified in every production lot.
Is SMB8J30CAHM3/H suitable for automotive applications?
Yes, SMB8J30CAHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction - making it approved for use in automotive powertrain, chassis, and body electronics. Its 150 °C max junction temperature and robust surge ratings align with ISO 16750-2 and ISO 7637-2 requirements.
How does the bidirectional configuration of SMB8J30CAHM3/H affect its circuit implementation?
The SMB8J30CAHM3/H has symmetrical bidirectional characteristics - meaning it provides identical clamping for both positive and negative transients without polarity dependency. This eliminates orientation concerns during placement and simplifies design for AC-coupled or differential interfaces like RS-485 or USB, unlike unidirectional TVS diodes that require correct cathode alignment.
What is the significance of the "HM3" suffix in SMB8J30CAHM3/H?
The "HM3" suffix in SMB8J30CAHM3/H denotes halogen-free, RoHS-compliant construction with matte tin plating and JESD201 Class 2 whisker resistance. It also confirms compliance with Vishay's material categorization standard (doc# 99912) and supports lead-free reflow up to 260 °C - essential for modern automotive and industrial assembly processes.
Can SMB8J30CAHM3/H replace a unidirectional TVS in an existing design?
SMB8J30CAHM3/H can replace a unidirectional TVS only if the circuit topology and surge threat model are inherently bidirectional - such as AC signal lines or differential buses. For DC-biased single-ended lines, a unidirectional device may offer tighter leakage control; verify reverse leakage (1.0 µA max) and forward conduction behavior before substitution in DC-coupled applications.
SMB8J30CAHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- 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/H FAQ
1.How can I place an order for SMB8J30CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J30CAHM3/H 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/H reliable?
The price and inventory of SMB8J30CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J30CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMB8J30CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J30CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J30CAHM3/H?
SMB8J30CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J30CAHM3/H 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/H?
For technical support, including SMB8J30CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J30CAHM3/H requirements.
6.How does Aetrix verify that SMB8J30CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMB8J30CAHM3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMB8J30CAHM3/H?
All SMB8J30CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J30CAHM3/H, 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/H part is unused and in its original packaging.
Return procedure for SMB8J30CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J30CAHM3/H Tags
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