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Vishay General Semiconductor - Diodes Division SMB8J22CAHM3_B/I
- Part No.:
- SMB8J22CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J22CAHM3_B/I.pdf
- Description:
- 800W,22V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,266
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Product details
Overview
SMB8J22CAHM3_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 22 V stand-off voltage (VWM), 24.4–26.9 V breakdown voltage (VBR at 1 mA), 35.5 V clamping voltage (VC) at 22.5 A peak pulse current, and 800 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J22CAHM3_B/I datasheet, SMB8J22CAHM3_B/I pinout, SMB8J22CAHM3_B/I application, or SMB8J22CAHM3_B/I equivalent, key selection criteria include AEC-Q101 qualification, bidirectional clamping behavior, low clamping ratio (VC/VWM = 1.61), MSL Level 1 moisture sensitivity, and halogen-free RoHS compliance per HM3 suffix.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 22 V), then rapidly switches to low-impedance conduction when transients exceed VBR, limiting downstream voltage to ≤35.5 V. Its glass-passivated junction ensures stable breakdown and fast response (<1 ns), while the SMB package enables automated SMT placement with thermal resistance RθJA = 72 °C/W.
Rated for -55 °C to +150 °C operating junction temperature and qualified to AEC-Q101, SMB8J22CAHM3_B/I supports automotive-grade reliability in environments subject to load dump, ISO 7637-2 pulses, and ESD events. The HM3 suffix confirms halogen-free, RoHS-compliant construction and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 24.4 V / 26.9 V at 1 mA - tight breakdown tolerance ensures predictable turn-on across temperature and production lot. |
| VC @ IPPM | 35.5 V at 22.5 A - clamping voltage limits protected circuit stress during 800 W surge; clamping ratio = 1.61. |
| PPPM | 800 W (10/1000 µs) - energy-handling capacity suitable for IEC 61000-4-5 Level 3 (1 kV/2 Ω) and ISO 16750-2 load dump suppression. |
| TJ max | +150 °C - enables operation in under-hood automotive locations and high-ambient industrial enclosures. |
| Package | SMB (DO-214AA) - standardized surface-mount footprint (5.59 mm × 4.06 mm) compatible with IPC-7351B land patterns. |
| Qualification | AEC-Q101 qualified, MSL Level 1 (260 °C reflow), halogen-free (HM3), RoHS-compliant - meets automotive production requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical terminals allow either orientation in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (1 & 2) | Bidirectional surge path | Both terminals function identically; no cathode band - enables flexible routing and eliminates orientation-dependent assembly errors. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Protects AC-coupled and differential signal lines (e.g., CAN, LIN, RS-485) without polarity constraints. |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock per JEDEC standards. |
| Glass-passivated junction | Ensures long-term parameter stability and low leakage drift over 15-year service life in harsh environments. |
| Low clamping ratio (VC/VWM) | 1.61 - minimizes overvoltage exposure to downstream ICs compared to alternatives with ratios >1.8. |
| Halogen-free (HM3) | Complies with automotive OEM material declarations (e.g., GMW3172, Ford WSS-M99P9999-A1) and EU ELV Directive. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) in engine control units against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Shunt TVS placed between signal line and ground, clamping transients before they reach ADC input or signal conditioner. Use Value: Prevents sensor signal corruption and microcontroller reset events during 12 V/24 V system surges up to 800 W. |
Use Scenario: Safeguarding PLC digital input modules connected to 24 V DC field devices subject to relay coil flyback and ESD. IC Role / Device Role / Timing Role: Bidirectional clamp on dry-contact or PNP/NPN input lines, absorbing both positive and negative polarity transients. Use Value: Eliminates need for separate unidirectional devices per line, reducing BOM count and PCB area in DIN-rail mounted controllers. |
| Automotive Body Control Module | Telecom Line Interface |
Use Scenario: Surge protection on LIN bus lines in door modules and lighting control units exposed to battery transients and ESD. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector entry point, preserving LIN signal integrity (≤20 kbps). Use Value: Maintains <10 pF junction capacitance (typ.) to avoid signal rise-time degradation while meeting ISO 10605 ESD immunity (±25 kV air). |
Use Scenario: Protecting Ethernet PHY interface pins (e.g., MDI pairs) in industrial gateways from lightning-induced surges on PoE or data lines. IC Role / Device Role / Timing Role: Secondary-level TVS after gas discharge tube (GDT), providing fast clamping for residual transients below 100 ns. Use Value: Coordinates with upstream GDT to achieve IEC 61000-4-5 Level 4 (4 kV/12 Ω) immunity without compromising data rate. |
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/I | Same electrical specs, but RoHS-compliant commercial grade (E3) - not AEC-Q101 qualified; uses standard tin plating without halogen-free assurance. | Suitable for non-automotive industrial or consumer applications where automotive qualification is not required. | Select SMB8J22CAHE3_B/I only if AEC-Q101 and halogen-free compliance are unnecessary; otherwise SMB8J22CAHM3_B/I is preferred. |
| SMAJ22CA | Same VWM/VC ratings but lower PPPM (400 W); SMA package (smaller footprint, higher RθJA = 95 °C/W). | Limited to lower-energy threats (e.g., IEC 61000-4-2 ESD only); unsuitable for load dump or ISO 7637-2 testing. | Choose SMAJ22CA only for space-constrained, non-automotive designs with ≤400 W surge requirements; SMB8J22CAHM3_B/I delivers 2× power handling. |
Compared with SMB8J22CAHE3_B/I, SMB8J22CAHM3_B/I adds AEC-Q101 qualification and halogen-free compliance; versus SMAJ22CA, it provides double the surge power rating and superior thermal performance in the larger SMB package - critical for automotive and industrial reliability.
Availability
SMB8J22CAHM3_B/I is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and telecom infrastructure requiring stable component supply with full traceability and long-lifecycle support.
Supply support for SMB8J22CAHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on high-reliability and automotive-grade solutions.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for robust, bidirectional transient suppression in automotive and industrial environments where AEC-Q101 compliance and high surge power are mandatory.
FAQ
What is the meaning of the "HM3" suffix in SMB8J22CAHM3_B/I?
The HM3 suffix in SMB8J22CAHM3_B/I indicates halogen-free, RoHS-compliant construction with matte tin-plated leads that meet JESD201 Class 2 whisker resistance. It also confirms AEC-Q101 qualification - distinguishing it from commercial-grade E3 variants. This makes SMB8J22CAHM3_B/I suitable for automotive production and environmentally regulated industrial applications.
Does SMB8J22CAHM3_B/I have polarity markings on the package?
No, SMB8J22CAHM3_B/I is a bidirectional TVS diode and carries no cathode band or polarity marking on the SMB (DO-214AA) case. Both terminals are functionally identical, allowing unrestricted orientation during PCB placement - a key advantage for differential or AC-coupled signal protection layouts.
What is the maximum clamping voltage of SMB8J22CAHM3_B/I and at what current is it specified?
The maximum clamping voltage of SMB8J22CAHM3_B/I is 35.5 V, measured at a peak pulse current (IPPM) of 22.5 A using the standardized 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuits during an 800 W transient event, ensuring downstream ICs remain within safe operating voltage margins.
Can SMB8J22CAHM3_B/I be used in place of a unidirectional TVS like SMB10J22A?
SMB8J22CAHM3_B/I is not a direct replacement for unidirectional devices such as SMB10J22A because it lacks polarity and cannot block forward current. It is intended for bidirectional protection only. Substituting SMB8J22CAHM3_B/I in a unidirectional application may cause unintended conduction during normal forward bias - always verify circuit topology before interchange.
What is the thermal resistance from junction to ambient (RθJA) for SMB8J22CAHM3_B/I?
The typical junction-to-ambient thermal resistance (RθJA) for SMB8J22CAHM3_B/I is 72 °C/W when mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB construction and is critical for calculating maximum allowable power dissipation at elevated ambient temperatures in SMB8J22CAHM3_B/I designs.
SMB8J22CAHM3_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):
- 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/I FAQ
1.How can I place an order for SMB8J22CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J22CAHM3_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 SMB8J22CAHM3_B/I reliable?
The price and inventory of SMB8J22CAHM3_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 SMB8J22CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMB8J22CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J22CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J22CAHM3_B/I?
SMB8J22CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J22CAHM3_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 SMB8J22CAHM3_B/I?
For technical support, including SMB8J22CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J22CAHM3_B/I requirements.
6.How does Aetrix verify that SMB8J22CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMB8J22CAHM3_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 SMB8J22CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMB8J22CAHM3_B/I?
All SMB8J22CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J22CAHM3_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 SMB8J22CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMB8J22CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J22CAHM3_B/I Tags
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