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Vishay General Semiconductor - Diodes Division SMB8J40CAHM3_A/I
- Part No.:
- SMB8J40CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J40CAHM3_A/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J40CAHM3_A/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 power and signal lines. It features a 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), 64.5 V clamping voltage (VC) at 12.4 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - optimized for automotive-grade ESD and load-dump protection in sensor interfaces and power rails.
For engineers reviewing the SMB8J40CAHM3_A/I datasheet, SMB8J40CAHM3_A/I pinout, SMB8J40CAHM3_A/I application, or SMB8J40CAHM3_A/I equivalent, key selection criteria include its AEC-Q101 qualification, bidirectional polarity, low clamping ratio (VC/VWM ≈ 1.61), halogen-free RoHS-compliant construction (HM3 suffix), and compatibility with automated SMT placement on standard 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche junction structure, responding in <1 ps to transients per IEEE C62.35 standards. Its bidirectional configuration enables symmetrical suppression of both positive and negative surges without polarity sensitivity, making it suitable for AC-coupled or floating signal paths.
Thermal performance is defined by RθJA = 72 °C/W and RθJL = 20 °C/W, supporting operation from –55 °C to +150 °C junction temperature. The glass-passivated chip junction ensures stable leakage (<1.0 µA at VWM) and robust surge endurance under repetitive 8.3 ms half-sine wave stress up to 100 A IFSM (unidirectional only; not applicable here).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 36 V nominal systems. |
| VBR min/max | 44.4 V / 49.1 V at 1.0 mA - guaranteed avalanche onset range; ensures predictable turn-on across production lots and temperature. |
| VC @ IPPM | 64.5 V at 12.4 A - clamped voltage during 10/1000 µs surge; limits downstream IC stress to ≤64.5 V under full-rated transient. |
| PPPM | 800 W - peak pulse power handling with 10/1000 µs waveform; supports ISO 7637-2 Pulse 5a (load dump) simulation. |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage at rated stand-off; minimizes quiescent power loss in battery-powered sensors. |
| TJ max | +150 °C - extended junction temperature rating enabling under-hood automotive deployment without derating. |
| AEC-Q101 | Qualified - validated for automotive reliability including HTOL, TCT, and ESD testing per AEC specification. |
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); polarity unmarked (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminals | No functional distinction between pins; interchangeable in circuit layout; no color band marking required. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control units, ADAS sensors, and body controllers. |
| Halogen-free & RoHS-compliant (HM3) | Meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability for safety-critical assemblies. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio TVS devices. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns. |
| Glass-passivated junction | Ensures stable VBR and low leakage over lifetime, even under thermal cycling and humidity stress. |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Transceiver Protection |
|---|---|
|
Use Scenario: Protecting LIN/CAN transceivers and analog sensor outputs (e.g., pressure, temperature) from ISO 16750-2 load dump and ISO 7637-3 coupled transients. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and ground, absorbing energy before it reaches the transceiver input stage. Use Value: Maintains signal integrity during 800 W surges while holding clamped voltage below 65 V - within absolute maximum ratings of common 5 V and 3.3 V transceivers. |
Use Scenario: Safeguarding two-wire CAN FD physical layer against ESD (IEC 61000-4-2 ±25 kV) and fast transient bursts (IEC 61000-4-4). IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF at 0 V) bidirectional shunt clamp across CANH–CANL differential pair. Use Value: Adds <1 ns response delay and zero impact on bus timing; clamps common-mode surges without distorting differential signaling. |
| DC Power Rail Surge Suppression | Consumer USB Port ESD Protection |
|
Use Scenario: Secondary-level protection on 24–48 V DC power inputs in industrial PLCs and motor drives exposed to inductive switching noise. IC Role / Device Role / Timing Role: Parallel-connected TVS across input rail and chassis ground, triggered only during overvoltage events >40 V. Use Value: Handles 800 W pulses without degradation; thermal resistance (RθJL = 20 °C/W) enables direct PCB copper pad conduction for sustained surge dissipation. |
Use Scenario: Board-level ESD hardening for USB 2.0 data lines (D+/D−) in automotive infotainment head units and portable diagnostics tools. IC Role / Device Role / Timing Role: Bidirectional clamp placed inline with each data line, referenced to ground, meeting IEC 61000-4-2 Level 4 (±15 kV contact). Use Value: Sub-100 pF capacitance avoids USB 2.0 eye diagram distortion; AEC-Q101 qualification ensures reliability in vibration-prone vehicle environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J40CAHE3_A/I | Same electrical specs, but RoHS-compliant (E3) without halogen-free certification; MSL Level 1 and AEC-Q101 retained. | Preferred for commercial-automotive hybrids where halogen content is unrestricted; identical footprint and soldering profile. | Select when halogen-free requirement is waived and cost optimization is prioritized over green material compliance. |
| SMAJ40CA | Lower PPPM (400 W), larger SMA (DO-214AC) package (4.5 × 2.7 mm), same VWM/VC but higher RθJA (90 °C/W). | Suitable for lower-energy transients or space-constrained layouts where SMB's 3.94 mm width is prohibitive. | Choose only if board area allows larger footprint and surge energy is confirmed ≤400 W; not drop-in due to size and thermal derating. |
Compared with SMB8J40CAHM3_A/I, the HE3 variant offers identical protection performance at lower material cost, while SMAJ40CA trades power handling and thermal efficiency for reduced height - requiring layout revision and careful thermal validation in automotive deployments.
Availability
SMB8J40CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial CAN networks, and DC power distribution systems requiring stable component supply with AEC-Q101 assurance and halogen-free compliance.
Supply support for SMB8J40CAHM3_A/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, precision, and automotive-grade qualification.
The SMB8JxxCA series targets high-reliability transient suppression in harsh environments, specifically engineered for AEC-Q101 compliance, low clamping voltage, and seamless integration into automated SMT lines.
FAQ
What is the clamping voltage of SMB8J40CAHM3_A/I at its rated peak pulse current?
The SMB8J40CAHM3_A/I has a maximum clamping voltage (VC) of 64.5 V at 12.4 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during a full-rated transient event. The SMB8J40CAHM3_A/I maintains this clamping performance across its qualified operating temperature range.
Is SMB8J40CAHM3_A/I suitable for protecting CAN FD bus lines?
Yes, SMB8J40CAHM3_A/I is suitable for CAN FD bus protection due to its bidirectional symmetry, low junction capacitance (<100 pF at 0 V), and sub-nanosecond response time. Its 40 V stand-off voltage accommodates common-mode voltage excursions on 12 V automotive buses, and its 64.5 V clamping level stays well below the absolute maximum ratings of most CAN FD transceivers. The SMB8J40CAHM3_A/I is widely deployed in AEC-Q101-compliant vehicle networks.
Does SMB8J40CAHM3_A/I require a heatsink for 800 W surge handling?
No, SMB8J40CAHM3_A/I does not require an external heatsink for single-event 800 W surge handling. Its thermal design relies on transient thermal impedance rather than steady-state dissipation; the 10/1000 µs pulse duration is too short for significant heat accumulation. However, PCB layout must follow Vishay's recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to ensure proper heat spreading and mechanical reliability. The SMB8J40CAHM3_A/I achieves this with RθJL = 20 °C/W to the leads.
How does the HM3 suffix affect the compliance status of SMB8J40CAHM3_A/I?
The HM3 suffix on SMB8J40CAHM3_A/I indicates halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance and UL 94 V-0 flammability. It also confirms AEC-Q101 qualification for automotive use. Unlike E3-suffixed variants, HM3 guarantees absence of brominated flame retardants and chlorine-based compounds - critical for emissions-sensitive applications such as enclosed EV battery management systems. The SMB8J40CAHM3_A/I retains identical electrical performance to non-HM3 versions.
Can SMB8J40CAHM3_A/I replace SMBJ40CA in an existing design?
SMB8J40CAHM3_A/I is not a direct replacement for SMBJ40CA due to differing surge ratings: SMBJ40CA is rated for 600 W (bidirectional), while SMB8J40CAHM3_A/I delivers 800 W. Though both share SMB (DO-214AA) package and pinout, the higher power rating of SMB8J40CAHM3_A/I may alter thermal decay behavior and PCB copper requirements. Validation of clamping consistency, layout thermal relief, and system-level surge testing is required before substitution. The SMB8J40CAHM3_A/I offers enhanced protection margin but demands verification in the target application.
SMB8J40CAHM3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 12.4A
- 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)
SMB8J40CAHM3_A/I FAQ
1.How can I place an order for SMB8J40CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J40CAHM3_A/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 SMB8J40CAHM3_A/I reliable?
The price and inventory of SMB8J40CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J40CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMB8J40CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J40CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J40CAHM3_A/I?
SMB8J40CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J40CAHM3_A/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 SMB8J40CAHM3_A/I?
For technical support, including SMB8J40CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J40CAHM3_A/I requirements.
6.How does Aetrix verify that SMB8J40CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMB8J40CAHM3_A/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 SMB8J40CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMB8J40CAHM3_A/I?
All SMB8J40CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J40CAHM3_A/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 SMB8J40CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMB8J40CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J40CAHM3_A/I 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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Toshiba Semiconductor and Storage
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Diodes Incorporated
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