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Vishay General Semiconductor - Diodes Division SMB8J22CAHM3_B/H
- Part No.:
- SMB8J22CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J22CAHM3_B/H.pdf
- Description:
- 800W,22V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,991
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Product details
Overview
SMB8J22CAHM3_B/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 22 V stand-off voltage (VWM), 35.5 V clamping voltage (VC) at 22.5 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 SMB8J22CAHM3_B/H datasheet, SMB8J22CAHM3_B/H pinout, SMB8J22CAHM3_B/H application, or SMB8J22CAHM3_B/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 22 V working voltage tolerance, and compatibility with automated SMT assembly on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within <1 ns to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, while the bidirectional configuration enables symmetric suppression across AC-coupled or floating lines without polarity constraints.
The device is rated for -55 °C to +150 °C operating junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its thermal resistance (RθJL = 20 °C/W) supports reliable power dissipation under repetitive surge conditions when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 24.4 V / 26.9 V at 1 mA - verified breakdown threshold range ensuring consistent turn-on across production lots. |
| VC @ IPPM | 35.5 V at 22.5 A - clamping voltage during 10/1000 μs surge; limits downstream IC stress to sub-36 V during 800 W transient events. |
| PPPM | 800 W - peak pulse power handling with 10/1000 μs waveform; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| ID @ VWM | 1.0 μA - ultra-low reverse leakage at 22 V; prevents signal distortion or bias shift in high-impedance sensor circuits. |
| TJ max. | +150 °C - junction temperature limit enabling use in under-hood automotive environments and sealed industrial enclosures. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, 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) | Transient conduction path | Both terminals function identically; no polarity marking required - simplifies PCB layout and eliminates orientation errors in automated placement. |
| Case (body) | Thermal and mechanical interface | Plastic body provides UL 94 V-0 flammability rating; copper pad mounting (0.2" × 0.2") required to achieve rated 800 W pulse power and RθJA = 72 °C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses (e.g., CAN, RS-485), and floating sensor outputs without external polarity management. |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules, ADAS camera interfaces, and body electronics exposed to harsh thermal and vibration profiles. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during surge events - critical for protecting 24 V-rated microcontrollers and analog front-ends with tight absolute maximum ratings. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C) without baking - reduces manufacturing overhead and avoids moisture-induced popcorn failure. |
| Glass-passivated junction | Ensures stable VBR over time and temperature, low leakage, and robustness against humidity and contamination in industrial and outdoor deployments. |
Applications
| Automotive Sensor Interface | Industrial Analog I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and temperature/pressure sensors connected to 24 V vehicle battery rails subject to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between signal line and ground, clamping surges before they reach the sensor ASIC or MCU GPIO. Use Value: Maintains signal integrity during 100 V/100 ms load dump events by limiting voltage to ≤35.5 V, preventing latch-up or permanent damage to 3.3 V/5 V interface circuitry. |
Use Scenario: Safeguarding 4–20 mA current loop inputs and ±10 V analog inputs in PLC modules exposed to field wiring transients and ESD. IC Role / Device Role / Timing Role: Bidirectional voltage clamp across differential input pins, absorbing fast-rising spikes from relay coil switching or lightning-induced coupling. Use Value: Enables compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) without additional series impedance or filtering - preserving bandwidth and DC accuracy. |
| Automotive Camera Module Power Line | RS-485 Data Line Protection |
Use Scenario: Protecting 12 V power input of rear-view or surround-view cameras mounted near motors and actuators generating commutation noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on VCC rail, placed upstream of DC/DC converter to prevent input overvoltage shutdown or internal FET failure. Use Value: Withstands 800 W surges while maintaining <1.0 μA leakage at 12 V - avoids quiescent current increase that would compromise low-power sleep modes in ADAS systems. |
Use Scenario: Shielding full-duplex RS-485 transceivers in factory automation networks from ground potential differences and cable discharge events. IC Role / Device Role / Timing Role: Common-mode TVS across A/B lines referenced to local ground, suppressing common-mode transients without distorting differential signaling. Use Value: Clamps common-mode surges to ≤35.5 V while adding <0.5 pF capacitance - preserves signal rise/fall times and maintains >10 Mbps data integrity over 1200 m cable runs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J22CAHE3_B/H | Same electrical specs and SMB package; RoHS-compliant but not halogen-free (vs. HM3's halogen-free molding compound). | Approved for commercial and industrial use; lacks halogen-free certification required for some automotive Tier 1 supply chains. | Select HE3 if halogen content is unrestricted and cost optimization is prioritized; HM3 required where halogen-free compliance is mandated (e.g., VW 80101). |
| SMAJ22CA | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W), same VWM/VC. | Suitable only for lower-energy transients (IEC 61000-4-2 Level 3); not qualified to AEC-Q101. | Choose SMAJ22CA only for space-constrained non-automotive designs with ≤400 W surge requirements and no automotive qualification needs. |
Compared with SMB8J22CAHE3_B/H, the HM3 variant adds halogen-free compliance without sacrificing electrical performance or thermal capability; versus SMAJ22CA, SMB8J22CAHM3_B/H delivers double the surge power rating and automotive qualification - making it the sole option for AEC-Q101–mandated 24 V system protection.
Availability
SMB8J22CAHM3_B/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial analog I/O hardening, and RS-485 data line safeguarding requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMB8J22CAHM3_B/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, power density, and application-specific validation.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-reliability transient suppression in automotive, industrial, and telecom infrastructure where AEC-Q101 compliance and 800 W surge handling are mandatory.
FAQ
What is the clamping voltage of SMB8J22CAHM3_B/H at its rated peak pulse current?
The SMB8J22CAHM3_B/H has a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current (IPPM) of 22.5 A with a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees predictable overvoltage limiting for downstream 24 V system components. The SMB8J22CAHM3_B/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMB8J22CAHM3_B/H suitable for automotive applications?
Yes, SMB8J22CAHM3_B/H is AEC-Q101 qualified and specifically designed for automotive use - including engine control units, ADAS camera modules, and body electronics. Its halogen-free construction (HM3 suffix), MSL Level 1 rating, and guaranteed operation from -55 °C to +150 °C meet stringent automotive environmental and reliability requirements. The SMB8J22CAHM3_B/H is listed in Vishay's automotive-grade product portfolio with full qualification test reports available upon request.
How does SMB8J22CAHM3_B/H differ from unidirectional variants like SMB10J22A?
SMB8J22CAHM3_B/H is bidirectional with symmetrical clamping in both polarities, while SMB10J22A is unidirectional and conducts only in reverse bias. The SMB8J22CAHM3_B/H offers 800 W PPPM and 22.5 A IPPM, whereas SMB10J22A delivers 1000 W PPPM and 28.2 A IPPM but requires correct polarity placement. The SMB8J22CAHM3_B/H eliminates orientation concerns in AC or floating circuits - a key advantage for RS-485, LIN, and sensor differential pairs where polarity is undefined.
What PCB layout guidance applies to SMB8J22CAHM3_B/H for optimal surge performance?
To achieve the rated 800 W peak pulse power, SMB8J22CAHM3_B/H must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per Vishay's datasheet Figure 2 and thermal characterization. Avoid narrow traces or thermal reliefs between the device and ground/power planes. Use solid inner-layer copper pours connected via multiple vias to enhance heat spreading. The SMB8J22CAHM3_B/H's RθJL of 20 °C/W depends on this layout - insufficient copper area will cause premature thermal derating and clamping voltage drift.
Does SMB8J22CAHM3_B/H have a specified junction capacitance?
No, junction capacitance (CJ) is not specified for SMB8J22CAHM3_B/H in the official Vishay datasheet (Document Number: 88422, Rev. 09-Jan-2024). Unlike low-capacitance TVS devices optimized for high-speed data lines, the SMB8J22CAHM3_B/H is engineered for power and signal line surge protection where capacitance is secondary to energy handling. For applications requiring <100 pF CJ (e.g., USB 2.0, HDMI), consult Vishay's SDTxxx or TPSMxx families - the SMB8J22CAHM3_B/H is not characterized for such use cases.
SMB8J22CAHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 22V
- Current - Peak Pulse (10/1000µs):
- 22.5A
- 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)
SMB8J22CAHM3_B/H FAQ
1.How can I place an order for SMB8J22CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J22CAHM3_B/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 SMB8J22CAHM3_B/H reliable?
The price and inventory of SMB8J22CAHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J22CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMB8J22CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J22CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J22CAHM3_B/H?
SMB8J22CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J22CAHM3_B/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 SMB8J22CAHM3_B/H?
For technical support, including SMB8J22CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J22CAHM3_B/H requirements.
6.How does Aetrix verify that SMB8J22CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMB8J22CAHM3_B/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 SMB8J22CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMB8J22CAHM3_B/H?
All SMB8J22CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J22CAHM3_B/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 SMB8J22CAHM3_B/H part is unused and in its original packaging.
Return procedure for SMB8J22CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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