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Vishay General Semiconductor - Diodes Division SMB8J5.0CAHM3/H
- Part No.:
- SMB8J5.0CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J5.0CAHM3/H.pdf
- Description:
- TVS DIODE 5VWM 9.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,612
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Product details
Overview
SMB8J5.0CAHM3/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 5.0 V stand-off voltage (VWM), 6.4–7.25 V breakdown voltage (VBR at 10 mA), 9.2 V maximum clamping voltage (VC) at 2000 A peak pulse current, and 800 W peak pulse power (10/1000 µs waveform). It is AEC-Q101 qualified and used to protect automotive sensor interfaces against ESD and load dump transients.
For engineers reviewing the SMB8J5.0CAHM3/H datasheet, SMB8J5.0CAHM3/H pinout, SMB8J5.0CAHM3/H application, or SMB8J5.0CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM = 1.84), halogen-free RoHS compliance, MSL Level 1 rating, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This device operates as a voltage-clamped crowbar during transient events, leveraging an avalanche breakdown mechanism to shunt surge current away from protected circuitry. Its bidirectional symmetry enables protection of AC-coupled or differential signal paths without polarity constraints.
Designed for fast response (<1 ns), it maintains low incremental surge resistance and exhibits stable clamping performance up to 150 °C junction temperature. The glass-passivated junction ensures robustness against moisture and thermal cycling, while matte tin-plated leads support reliable soldering per J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 5.0 V - Maximum continuous reverse operating voltage before significant leakage; defines safe signal swing margin in protected line. |
| VBR (min/max) | 6.40 V / 7.25 V at 10 mA - Ensures consistent avalanche initiation across production lots; guarantees turn-on within defined voltage window. |
| VC @ IPPM | 9.2 V at 2000 A (10/1000 µs) - Limits voltage seen by downstream ICs during worst-case surge; clamping ratio = 1.84×VWM. |
| PPPM | 800 W - Sustains high-energy transients (e.g., ISO 7637-2 Pulse 1/2a/5a) without failure when mounted on recommended 5.0 mm × 5.0 mm copper pads. |
| IPPM | 2000 A - Peak surge current handling capacity under standardized 10/1000 µs waveform; validates robustness against automotive load dump. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures with elevated ambient temperatures. |
| AEC-Q101 | Qualified - Confirmed reliability for automotive electronics per stress test requirements including HTGB, HTRB, and TCT. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow). Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); cathode band not applicable for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminals | No polarity marking; either terminal serves as anode or cathode depending on transient polarity - enables placement without orientation check. |
| Case (body) | Non-electrical mechanical interface | Plastic molding meets UL 94 V-0; provides insulation and mechanical stability during board flex or thermal cycling. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC, differential, or floating signal lines (e.g., CAN, LIN, sensor bridges) without requiring polarity-aware layout. |
| AEC-Q101 qualification | Validated for automotive use - includes temperature cycling, high-temperature reverse bias, and accelerated life testing per JEDEC standards. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets global environmental regulations and supports lead-free assembly processes without compromising surge robustness. |
| Low clamping voltage (9.2 V) | Minimizes stress on 5 V-tolerant receivers (e.g., automotive microcontrollers, analog front-ends) during 2000 A surges. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profile usage (peak 260 °C), eliminating bake-out requirements in manufacturing. |
Applications
| Automotive Sensor Interface | Industrial CAN Bus Node |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control modules exposed to ISO 7637-2 load dump pulses. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector entry point to divert surge energy before reaching ADC input or signal conditioner. Use Value: Prevents latch-up or permanent damage to 5 V rail-connected op-amps and microcontroller GPIOs during 12 V system transients. |
Use Scenario: Shielding CAN_H/CAN_L differential pair in factory automation gateways subjected to EFT bursts and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp installed across differential bus lines to maintain signal integrity while suppressing ±25 kV ESD per IEC 61000-4-2. Use Value: Maintains <1 pF junction capacitance (per datasheet Fig. 4) to avoid CAN bit timing distortion at 1 Mbps data rates. |
| Consumer USB-C Power Delivery | Telecom DSL Line Interface |
|
Use Scenario: Safeguarding VBUS and CC lines in automotive infotainment USB-C ports against hot-plug surges and reverse-voltage faults. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of USB PD controller to absorb 1000 W transients without forward conduction into logic circuitry. Use Value: 5.0 V VWM aligns with USB PD 3.0 VBUS monitoring thresholds, enabling precise overvoltage detection without false triggering. |
Use Scenario: Protecting ADSL/VDSL line drivers and receivers from lightning-induced surges entering via outdoor copper pairs. IC Role / Device Role / Timing Role: Primary-level bidirectional suppressor mounted at line card edge, coordinated with gas discharge tube (GDT) secondary protection. Use Value: 800 W PPPM sustains multiple 10/1000 µs surges per ITU-T K.20/K.21, extending service life in telecom central office deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ5.0CA-E3/52 | Unqualified for AEC-Q101; same VWM, VBR, VC, but lower PPPM (600 W vs. 800 W) and no HM3 halogen-free assurance. | Restricted to commercial/industrial use; unsuitable for automotive Tier-1 BOMs requiring AEC-Q101 traceability. | Select only if cost sensitivity outweighs automotive qualification and higher surge margin requirements. |
| SMCJ5.0CA-HM3 | Same AEC-Q101/HM3 spec, but larger SMC (DO-214AB) package (7.11 mm × 6.22 mm); 1500 W PPPM and 3000 A IPPM. | Requires larger PCB footprint and higher thermal mass; preferred where >800 W surge margin is mandated (e.g., battery disconnect circuits). | Choose when system-level surge testing exceeds 800 W or when legacy SMC footprints are already allocated. |
Compared with SMBJ5.0CA-E3/52, SMB8J5.0CAHM3/H delivers +33 % peak power handling and automotive qualification; versus SMCJ5.0CA-HM3, it saves 45 % board area while meeting most ISO 7637-2 Pulse 5a requirements - making it optimal for space-constrained automotive ECUs.
Availability
SMB8J5.0CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus nodes, consumer USB-C power delivery, and telecom DSL line interfaces requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMB8J5.0CAHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMB8J series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power-density, automotive-grade transient suppression in space-constrained environments where bidirectional clamping and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMB8J5.0CAHM3/H at its rated peak pulse current?
The SMB8J5.0CAHM3/H has a maximum clamping voltage (VC) of 9.2 V when subjected to its rated peak pulse current of 2000 A under the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet Document Number 88422, page 3 (Bidirectional Electrical Characteristics table). The low clamping ratio (9.2 V / 5.0 V = 1.84) ensures effective protection of 5 V logic and analog circuits without overstressing downstream components.
Is SMB8J5.0CAHM3/H suitable for automotive applications?
Yes, SMB8J5.0CAHM3/H is explicitly AEC-Q101 qualified, as stated in the Vishay datasheet revision 09-Jan-2024. The HM3 suffix denotes halogen-free, RoHS-compliant construction with whisker-resistant plating, and the device undergoes stress testing including high-temperature reverse bias, temperature cycling, and unbiased highly accelerated stress testing. It is approved for use in engine control units, body control modules, and ADAS sensor interfaces where automotive-grade reliability is required.
How does SMB8J5.0CAHM3/H differ from unidirectional variants like SMB10J5.0AHE3/H?
SMB8J5.0CAHM3/H is bidirectional with symmetrical clamping behavior on both polarities, whereas SMB10J5.0AHE3/H is unidirectional and conducts only in reverse bias. The SMB8J variant supports AC-coupled or differential signal protection (e.g., CAN, RS-485), while the unidirectional version suits DC power rail or single-ended I/O protection. Additionally, SMB8J5.0CAHM3/H offers higher peak pulse current (2000 A vs. 1000 A) and lower clamping voltage (9.2 V vs. 9.2 V for SMB10J5.0A - same value but at half the current), reflecting optimized bidirectional surge handling.
What is the thermal resistance of SMB8J5.0CAHM3/H, and how does it affect PCB layout?
The SMB8J5.0CAHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Thermal Characteristics section of the datasheet. To maintain safe junction temperatures under repeated surges, designers must implement minimum pad dimensions and consider internal copper planes. Reducing pad size or omitting thermal vias increases RθJA, risking thermal runaway during high-duty-cycle transients - thus the recommended layout is critical for SMB8J5.0CAHM3/H reliability.
Does SMB8J5.0CAHM3/H require orientation during placement on the PCB?
No, SMB8J5.0CAHM3/H does not require orientation during placement because it is a bidirectional TVS diode. Unlike unidirectional variants that feature a cathode band, the SMB8J5.0CAHM3/H has no polarity marking and functions identically regardless of terminal connection direction. This simplifies automated pick-and-place, eliminates orientation-related assembly errors, and supports symmetric routing on differential or floating signal lines - a key advantage in CAN, LIN, and sensor bridge applications.
SMB8J5.0CAHM3/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):
- 5V
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- 9.2V
- Current - Peak Pulse (10/1000µs):
- 87A
- 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)
SMB8J5.0CAHM3/H FAQ
1.How can I place an order for SMB8J5.0CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J5.0CAHM3/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 SMB8J5.0CAHM3/H reliable?
The price and inventory of SMB8J5.0CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J5.0CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMB8J5.0CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J5.0CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J5.0CAHM3/H?
SMB8J5.0CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J5.0CAHM3/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 SMB8J5.0CAHM3/H?
For technical support, including SMB8J5.0CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J5.0CAHM3/H requirements.
6.How does Aetrix verify that SMB8J5.0CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMB8J5.0CAHM3/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 SMB8J5.0CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMB8J5.0CAHM3/H?
All SMB8J5.0CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J5.0CAHM3/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 SMB8J5.0CAHM3/H part is unused and in its original packaging.
Return procedure for SMB8J5.0CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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