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Vishay General Semiconductor - Diodes Division SMB8J20CAHE3_A/H
- Part No.:
- SMB8J20CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J20CAHE3_A/H.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,991
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Product details
Overview
SMB8J20CAHE3_A/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 20 V stand-off voltage (VWM), 32.4 V maximum clamping voltage (VC) at 24.7 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 SMB8J20CAHE3_A/H datasheet, SMB8J20CAHE3_A/H pinout, SMB8J20CAHE3_A/H application, or SMB8J20CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low leakage (<1.0 µA at VWM), thermal resistance (RθJL = 20 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche breakdown junction, responding within picoseconds to transients induced by inductive switching or ESD. Its bidirectional symmetry enables protection of AC-coupled or differential lines without polarity constraints.
Designed per ANSI/IEEE C62.35 standards, it delivers stable clamping under repetitive surges when mounted per recommended pad layout, with junction temperature rated from –55 °C to +150 °C and MSL level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 22.2 V / 24.5 V - breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 32.4 V - clamped voltage seen by protected circuit during 24.7 A 10/1000 µs surge |
| PPPM | 800 W - peak transient energy absorption capacity under standard waveform |
| ID @ VWM | <1.0 µA - ultra-low leakage preserves signal integrity in high-impedance circuits |
| TJ max. | +150 °C - enables operation in under-hood automotive and industrial environments |
| RθJL | 20 °C/W - low junction-to-lead thermal resistance supports sustained surge handling with minimal derating |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; no polarity marking (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically - bidirectional clamping requires no orientation during placement |
| Case | Thermal and mechanical interface | Exposed metal slug provides primary heat dissipation path to PCB copper pads |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning |
| UL 94 V-0 molding compound | Meets flammability requirements for safety-critical industrial and automotive enclosures |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a) |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and jump-start transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed directly at connector entry point to shunt surge energy before reaching signal conditioning ICs. Use Value: Maintains signal fidelity below 32.4 V clamp while surviving 800 W pulses - critical for AEC-Q100-compliant microcontroller inputs. | Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges from relay coils or motor drives. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input lines, coordinated with series impedance and filtering. Use Value: Enables >100,000 surge cycles per IEC 61000-4-5 Level 3 due to low RθJL and stable VC across temperature. |
| Telecom Line Interface | Consumer USB Port ESD Protection |
Use Scenario: Transient suppression on RS-485/RS-422 differential pairs in base station backhaul equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to ground, leveraging bidirectional symmetry for AC signal integrity. Use Value: Clamps common-mode transients to <32.4 V without distorting data eye - verified per ITU-T K.21 basic protection level. | Use Scenario: Secondary-level surge protection on USB 2.0 VBUS and D+/D− lines in smart home hubs subjected to user-handling ESD. IC Role / Device Role / Timing Role: Fast-response clamping element downstream of primary polymer PTC, absorbing residual energy after initial current limiting. Use Value: Sub-1 ns response time prevents latch-up in USB transceivers; <1 µA leakage avoids standby current penalty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J20CAHM3_A/H | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU automotive Tier 1) | Direct substitution if halogen-free requirement applies; same footprint, thermal, and electrical behavior |
| SMAJ20CAHE3_A/H | Lower PPPM (400 W), smaller SMA (DO-214AC) package, higher RθJA (110 °C/W) | Suitable for lower-energy transients or space-constrained layouts where 800 W rating is not required | Use only where surge energy is ≤400 W; requires thermal redesign due to reduced power handling and higher junction temperature rise |
Compared with SMB8J20CAHE3_A/H, SMB8J20CAHM3_A/H offers identical protection performance with halogen-free construction, while SMAJ20CAHE3_A/H trades 50 % peak power and higher thermal resistance for 30 % smaller board area - requiring careful validation in high-surge automotive or industrial settings.
Availability
SMB8J20CAHE3_A/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O modules, telecom line interface boards, and consumer USB hub protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMB8J20CAHE3_A/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 automotive qualification.
The SMB8JxxCAHE3 family targets high-reliability transient suppression in harsh environments, engineered specifically for AEC-Q101 compliance and robust surge handling in automotive and industrial control systems.
FAQ
What is the clamping voltage of SMB8J20CAHE3_A/H at its rated peak pulse current?
The SMB8J20CAHE3_A/H has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current (IPPM) of 24.7 A under the standard 10/1000 µs waveform. This value is measured at TA = 25 °C with devices mounted on 5.0 mm × 5.0 mm copper pads per Vishay's recommended layout - ensuring predictable overvoltage limiting for downstream ICs.
Is SMB8J20CAHE3_A/H suitable for automotive applications?
Yes, SMB8J20CAHE3_A/H is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix. It meets stress tests including temperature cycling, high-temperature reverse bias, and ESD per JESD22-A114, making it appropriate for engine control units, body electronics, and ADAS sensor interfaces where reliability under thermal and electrical stress is mandatory.
How does the bidirectional configuration of SMB8J20CAHE3_A/H affect circuit design?
The bidirectional configuration of SMB8J20CAHE3_A/H eliminates polarity sensitivity, allowing placement on AC-coupled lines, differential buses (e.g., RS-485), or ungrounded signal paths without orientation concerns. Unlike unidirectional TVS diodes, SMB8J20CAHE3_A/H clamps both positive and negative transients symmetrically - simplifying layout and avoiding reverse-bias failure modes in floating systems.
What is the thermal resistance from junction to lead (RθJL) for SMB8J20CAHE3_A/H, and why does it matter?
SMB8J20CAHE3_A/H has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W. This low value enables efficient heat transfer from the silicon junction directly into the PCB copper through the device's metal slug, reducing thermal derating needs during repetitive surge events - especially critical in automotive and industrial applications where ambient temperatures exceed 85 °C.
Can SMB8J20CAHE3_A/H be used in place of a unidirectional TVS like SMB10J20A?
No - SMB8J20CAHE3_A/H is bidirectional with symmetrical clamping, while SMB10J20A is unidirectional and conducts only in reverse bias. Substituting SMB8J20CAHE3_A/H for SMB10J20A would allow forward conduction during normal operation, potentially disrupting DC bias or causing latch-up. The two share similar VWM and VC but differ fundamentally in polarity behavior and intended circuit topology.
SMB8J20CAHE3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 24.7A
- 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)
SMB8J20CAHE3_A/H FAQ
1.How can I place an order for SMB8J20CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J20CAHE3_A/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 SMB8J20CAHE3_A/H reliable?
The price and inventory of SMB8J20CAHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J20CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMB8J20CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J20CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J20CAHE3_A/H?
SMB8J20CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J20CAHE3_A/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 SMB8J20CAHE3_A/H?
For technical support, including SMB8J20CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J20CAHE3_A/H requirements.
6.How does Aetrix verify that SMB8J20CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMB8J20CAHE3_A/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 SMB8J20CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMB8J20CAHE3_A/H?
All SMB8J20CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J20CAHE3_A/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 SMB8J20CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMB8J20CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J20CAHE3_A/H Tags
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