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Vishay General Semiconductor - Diodes Division SMB8J22CAHE3/5B
- Part No.:
- SMB8J22CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J22CAHE3/5B.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,310
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Product details
Overview
SMB8J22CAHE3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection with 800 W peak pulse power (10/1000 μs), 22 V stand-off voltage (VWM), and 35.5 V clamping voltage (VC) at 22.5 A peak pulse current. It is AEC-Q101 qualified and used to protect automotive sensor signal lines, CAN transceivers, and power supply rails against ESD and load dump transients.
For engineers reviewing the SMB8J22CAHE3/5B datasheet, SMB8J22CAHE3/5B pinout, SMB8J22CAHE3/5B application, or SMB8J22CAHE3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 22 V working voltage, low leakage (<1.0 μA at VWM), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamped avalanche diode, responding within <1 ns to transient overvoltages and maintaining stable clamping performance across -55 °C to +150 °C junction temperature range. Its glass-passivated junction ensures robust reliability under repetitive surge stress, while MSL Level 1 rating supports lead-free reflow without popcorn cracking.
The SMB8J22CAHE3/5B features symmetrical bidirectional breakdown (24.4–26.9 V at 1 mA), enabling protection of AC-coupled or floating signal paths without polarity sensitivity. Its 72 °C/W junction-to-ambient thermal resistance requires minimal copper area (0.2" × 0.2") for full 800 W rating, making it suitable for space-constrained automotive ECUs and industrial I/O modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing margin for 24 V automotive systems. |
| VBR (min/max) | 24.4 V / 26.9 V - Breakdown occurs within this range at 1 mA test current; ensures consistent turn-on across production lot. |
| VC @ IPPM | 35.5 V - Clamping voltage at 22.5 A peak pulse current (10/1000 μs); limits downstream IC stress during ISO 7637-2 Pulse 1/2a/5a events. |
| PPPM | 800 W - Peak pulse power handling per 10/1000 μs waveform; supports protection against severe load-dump surges in 12 V/24 V vehicle networks. |
| ID @ VWM | <1.0 μA - Reverse leakage at 22 V; negligible power loss and signal distortion in always-on sensor interfaces. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood environments without derating in most mounting configurations. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminals require no orientation during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; connects across protected line and ground (or between differential lines) to clamp bidirectional surges. |
| Case | Thermal and mechanical interface | Plastic body with matte tin-plated leads; solderable per J-STD-002; provides 20 °C/W junction-to-lead thermal path when mounted on recommended 5.0 mm × 5.0 mm copper pads. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and surge endurance - required for engine control, ADAS, and body electronics. |
| Glass-passivated junction | Eliminates moisture ingress and electrochemical migration risks, ensuring long-term stability in humid under-hood environments. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning; reduces manufacturing complexity and cost. |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio = 1.41) versus legacy TVS devices, reducing voltage overshoot on protected ICs. |
Applications
| Automotive Sensor Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting analog output sensors (e.g., pressure, temperature) in engine control units exposed to ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 5a (load dump). IC Role / Device Role / Timing Role: Bidirectional clamping element placed between sensor signal line and chassis ground. Use Value: Limits transient voltage to ≤35.5 V during 22.5 A surges, preventing latch-up or gate oxide damage in downstream op-amps and ADCs. | Use Scenario: Safeguarding high-speed CAN FD transceivers (e.g., TJA1044, SN65HVD256) against ESD (IEC 61000-4-2 ±25 kV air) and fast transients on CAN_H/CAN_L lines. IC Role / Device Role / Timing Role: Low-capacitance (typ. 100 pF at 0 V) bidirectional TVS placed differential across bus lines. Use Value: Maintains signal integrity up to 5 Mbps by clamping without distorting edge timing; meets ISO 11898-2 EMC immunity requirements. |
| Industrial PLC I/O Protection | DC Power Rail Clamp |
Use Scenario: Shielding 24 V digital input modules from field-wiring induced surges (IEC 61000-4-4 EFT, 4 kV) in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between input terminal and common return, absorbing repetitive 500 A/10/1000 μs transients. Use Value: Withstands >1000 surges at rated power due to low thermal resistance (72 °C/W), extending module service life in harsh electrical environments. | Use Scenario: Secondary overvoltage clamp on regulated 24 V DC power rail feeding microcontrollers and communication ICs in railway signaling equipment. IC Role / Device Role / Timing Role: Parallel-connected TVS providing fail-safe voltage limiting when upstream DC/DC converter fails open-circuit. Use Value: Activates at 24.4 V (min VBR), clamping to 35.5 V before downstream 3.3 V LDOs or PMICs enter overvoltage shutdown or sustain damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22CAHE3/5B | Same VWM (22 V), same SMB package, but lower PPPM (600 W vs. 800 W); unidirectional variant not applicable here. | Lower surge capacity limits use in high-energy load-dump scenarios (e.g., alternator disconnection). | Select SMB8J22CAHE3/5B when full 800 W rating is required for ISO 7637-2 Pulse 5a compliance. |
| SMCJ22CAHE3/5B | Same electrical specs but larger SMC (DO-214AB) package; higher thermal mass yields 1500 W PPPM rating and 30 °C/W RθJL. | Requires larger PCB footprint and may not fit in tight automotive sensor housings. | Choose SMB8J22CAHE3/5B where board space is constrained but 800 W suffices; choose SMCJ22CAHE3/5B for higher surge margin and better thermal performance. |
Compared with SMBJ22CAHE3/5B and SMCJ22CAHE3/5B, SMB8J22CAHE3/5B delivers optimal balance of AEC-Q101 compliance, 800 W surge capability, and SMB footprint - making it the preferred choice for space-limited automotive and industrial modules requiring certified robustness without overspec'ing package size or cost.
Availability
SMB8J22CAHE3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, CAN FD bus protection, industrial PLC I/O modules, and 24 V DC power rail clamping requiring stable component supply across multi-year production cycles.
Supply support for SMB8J22CAHE3/5B 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, efficiency, and automotive-grade qualification.
The SMB8JxxCA family is engineered specifically for high-reliability transient suppression in automotive and industrial environments, combining AEC-Q101 validation, low-profile SMB packaging, and precise bidirectional clamping for next-generation electronic control units.
FAQ
What is the clamping voltage of SMB8J22CAHE3/5B at its rated peak pulse current?
The SMB8J22CAHE3/5B has a maximum clamping voltage (VC) of 35.5 V at 22.5 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees predictable overvoltage limiting during surge events - critical for protecting 3.3 V or 5 V logic circuits downstream of the SMB8J22CAHE3/5B.
Is SMB8J22CAHE3/5B suitable for automotive applications?
Yes, SMB8J22CAHE3/5B is AEC-Q101 qualified and explicitly designed for automotive use. Its construction includes glass-passivated junction, MSL Level 1 rating, and operation from -55 °C to +150 °C - meeting requirements for engine control, body electronics, and ADAS modules. The "HE3" suffix confirms RoHS-compliant and AEC-Q101 qualified status per Vishay's ordering nomenclature.
How does SMB8J22CAHE3/5B differ from unidirectional variants like SMB10J22AHE3/5B?
SMB8J22CAHE3/5B is bidirectional with symmetrical breakdown (24.4–26.9 V), enabling protection of AC-coupled or floating lines such as CAN bus pairs. In contrast, SMB10J22AHE3/5B is unidirectional (anode-cathode polarized), suited only for DC rail-to-ground protection. Their peak pulse power also differs: 800 W (bidirectional) vs. 1000 W (unidirectional), reflecting different surge energy distribution paths.
What is the reverse leakage current of SMB8J22CAHE3/5B at its stand-off voltage?
At the 22 V stand-off voltage (VWM), the SMB8J22CAHE3/5B exhibits a maximum reverse leakage current (ID) of 1.0 μA at 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes standby power loss in always-on automotive modules - a key advantage over older TVS families with leakage in the 5–10 μA range.
Does SMB8J22CAHE3/5B require special PCB layout considerations?
Yes - to achieve its full 800 W rating, SMB8J22CAHE3/5B must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per Vishay's thermal design guidelines. Smaller pads reduce heat dissipation, derating peak power significantly. Additionally, short, wide traces to ground minimize inductance and preserve sub-nanosecond response time - essential for effective ESD and fast transient suppression.
SMB8J22CAHE3/5B 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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 22.5A
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J22CAHE3/5B FAQ
1.How can I place an order for SMB8J22CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J22CAHE3/5B 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 SMB8J22CAHE3/5B reliable?
The price and inventory of SMB8J22CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J22CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J22CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J22CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J22CAHE3/5B?
SMB8J22CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J22CAHE3/5B 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 SMB8J22CAHE3/5B?
For technical support, including SMB8J22CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J22CAHE3/5B requirements.
6.How does Aetrix verify that SMB8J22CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J22CAHE3/5B 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 SMB8J22CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J22CAHE3/5B?
All SMB8J22CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J22CAHE3/5B, 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 SMB8J22CAHE3/5B part is unused and in its original packaging.
Return procedure for SMB8J22CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J22CAHE3/5B Tags
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