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Vishay General Semiconductor - Diodes Division SMB8J20CAHE3/5B
- Part No.:
- SMB8J20CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J20CAHE3/5B.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J20CAHE3/5B 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 20 V stand-off voltage (VWM), 32.4 V clamping voltage (VC) at 24.7 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - optimized for automotive-grade ESD and load-dump protection in sensor interfaces and power supply rails.
For engineers reviewing the SMB8J20CAHE3/5B datasheet, SMB8J20CAHE3/5B pinout, SMB8J20CAHE3/5B application, or SMB8J20CAHE3/5B equivalent, key selection criteria include its AEC-Q101 qualification, bidirectional symmetry, low clamping ratio (VC/VWM = 1.62), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 20 V), but triggers into low-impedance conduction when transient voltage exceeds its 22.2–24.5 V breakdown range (VBR at 1 mA). Its glass-passivated junction ensures stable avalanche behavior across -55 °C to +150 °C operating range.
The SMB8J20CAHE3/5B delivers 800 W peak pulse power handling with <1 ns response time and low incremental surge resistance - critical for suppressing fast-rising transients from inductive switching or ISO 7637-2 pulse 1/2a/5a events. Its bidirectional architecture eliminates polarity sensitivity in AC-coupled or differential bus lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 12 V/24 V automotive systems. |
| VBR (min/max) | 22.2 V / 24.5 V - breakdown voltage range at 1 mA test current; ensures reliable triggering without premature conduction. |
| VC @ IPPM | 32.4 V at 24.7 A - clamping voltage during 10/1000 µs surge; limits downstream IC stress to safe levels per IEC 61000-4-5. |
| PPPM | 800 W - peak pulse power rating; supports robust protection against high-energy transients in harsh environments. |
| ID @ VWM | 1.0 µA - reverse leakage at stand-off voltage; minimizes quiescent power loss in battery-powered sensor nodes. |
| TJ max. | +150 °C - maximum junction temperature; enables operation in under-hood automotive locations with minimal derating. |
| Package | SMB (DO-214AA) - surface-mount outline with 2.2 mm × 3.9 mm footprint and 2.2 mm height; compatible with IPC-7351B standard land patterns. |
Pinout & Package
SMB8J20CAHE3/5B uses the standard SMB (DO-214AA) package: a two-terminal, bidirectional device with no polarity marking - both terminals are electrically symmetric. The case is molded with UL 94 V-0 rated compound, matte tin-plated leads meet J-STD-002 solderability, and thermal resistance is RθJA = 72 °C/W (on 0.2" × 0.2" Cu pads).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals serve identical roles in bidirectional clamping; no orientation required during placement. |
| Case | Thermal and mechanical interface | Plastic body provides electrical isolation; copper pad contact area directly impacts thermal dissipation and surge rating. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails per stress test requirements. |
| Glass-passivated junction | Ensures stable, repeatable avalanche characteristics over lifetime and temperature - critical for field-reliability in safety-critical systems. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes voltage overshoot during surge events, protecting downstream 3.3 V/5 V logic and analog front-ends without additional buffering. |
| MSL Level 1 (260 °C peak) | Enables single-reflow assembly without moisture sensitivity concerns - eliminates baking requirement in high-volume SMT lines. |
| Bidirectional symmetry | Eliminates polarity-check step in automated placement and supports AC signal line protection (e.g., CAN, LIN, USB D+/D-) without external diodes. |
Applications
| Automotive Sensor Interface | Industrial PLC Input Module |
|---|---|
Use Scenario: Protecting analog voltage outputs of pressure/temperature sensors in engine bay environments exposed to ISO 7637-2 load dump pulses. IC Role / Device Role / Timing Role: Shunt TVS clamping transient energy before it reaches ADC input or op-amp buffer stage. Use Value: Maintains signal integrity by limiting transient overshoot to ≤32.4 V, preventing latch-up or damage to 5 V rail-tied signal conditioning circuitry. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers subject to inductive kickback from solenoid/relay coils. IC Role / Device Role / Timing Role: Fast-response voltage clamp absorbing >100 A surge currents within nanoseconds to prevent controller reset or I/O port damage. Use Value: Enables direct connection to field wiring without series impedance, reducing BOM count while meeting IEC 61000-4-4 level 4 immunity requirements. |
| Automotive Body Control Unit | Telecom Power Supply Rail |
Use Scenario: Securing 12 V power distribution networks feeding door modules, lighting drivers, and window lift ECUs against battery reversal and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional clamping element placed at main power entry point to absorb both positive and negative transients. Use Value: Withstands 800 W peak power and operates up to +150 °C, enabling placement near fuse boxes or power relays without thermal derating. |
Use Scenario: Protecting DC-DC converter inputs in telecom base station power supplies subjected to lightning-induced surges on -48 V backup lines. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of bulk capacitance and active regulation circuitry. Use Value: Low 1.0 µA leakage at 20 V minimizes standby power loss across thousands of deployed units, improving system efficiency certification margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA-E3/5B | Same SMB package and 20 V VWM, but rated for 600 W PPPM (vs. 800 W) and lacks AEC-Q101 qualification. | Commercial-grade only; not suitable for automotive production or extended temperature operation beyond 125 °C. | Select when cost sensitivity outweighs automotive qualification and higher surge margin requirements. |
| SMCJ20CAHE3/5B | Same AEC-Q101 qualification and 20 V VWM, but in larger SMC (DO-214AB) package with 1500 W PPPM rating and lower VC (32.4 V same, but higher IPPM = 46.5 A). | Higher power handling enables use in main battery feed protection; requires larger PCB area and different land pattern. | Choose when system-level surge testing exceeds 800 W or when thermal budget demands lower RθJA. |
Compared with SMBJ20CA-E3/5B, SMB8J20CAHE3/5B delivers 33 % higher surge power margin and automotive qualification; versus SMCJ20CAHE3/5B, it trades 43 % smaller footprint and lower assembly cost for reduced absolute energy handling - ideal for space-constrained ECUs where 800 W meets OEM test specs.
Availability
SMB8J20CAHE3/5B is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC input hardening, body control unit power rail safeguarding, and telecom DC supply surge suppression requiring stable component supply across long production lifecycles.
Supply support for SMB8J20CAHE3/5B 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMB8JxxCAHE3 series belongs to Vishay's AEC-Q101-qualified TRANSZORB® TVS portfolio, engineered specifically for robust transient suppression in automotive electronics where failure modes must be rigorously controlled and validated.
FAQ
What is the clamping voltage of SMB8J20CAHE3/5B at its rated peak pulse current?
The SMB8J20CAHE3/5B has a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current of 24.7 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and ensures predictable voltage limiting during surge events - a critical parameter for protecting downstream 3.3 V or 5 V logic circuits connected to the same rail as SMB8J20CAHE3/5B.
Is SMB8J20CAHE3/5B suitable for automotive applications?
Yes, SMB8J20CAHE3/5B is AEC-Q101 qualified and explicitly designed for automotive use, including under-hood and body electronics. Its operating junction temperature range of -55 °C to +150 °C, MSL Level 1 reflow compatibility, and validation against automotive surge standards (e.g., ISO 7637-2) make it appropriate for ECUs, sensor modules, and power distribution units - all verified in the official Vishay qualification report for SMB8J20CAHE3/5B.
How does the bidirectional nature of SMB8J20CAHE3/5B affect circuit layout?
The bidirectional design of SMB8J20CAHE3/5B means both terminals are functionally identical - no cathode band or polarity marking is present, eliminating orientation constraints during PCB layout and automated placement. This simplifies routing on differential buses like CAN or LIN, avoids mistakes in high-volume manufacturing, and allows symmetric placement across AC-coupled signal paths without additional diode pairs - a key advantage over unidirectional TVS devices such as SMB10J20A in SMB8J20CAHE3/5B's application space.
What is the thermal resistance of SMB8J20CAHE3/5B, and how does it impact power handling?
SMB8J20CAHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" copper pads per JEDEC standards. This value directly determines allowable power dissipation: at 25 °C ambient, the device can sustain ~1.67 W continuously before reaching its 150 °C max junction temperature. For transient events, this thermal mass enables full 800 W pulse power absorption - provided PCB copper area matches the specified pad layout to maintain SMB8J20CAHE3/5B's rated performance.
Does SMB8J20CAHE3/5B require external series impedance for optimal protection?
No, SMB8J20CAHE3/5B is designed for direct parallel connection across protected lines without mandatory series impedance. Its sub-nanosecond response time and low dynamic impedance allow it to clamp transients before downstream components react. However, adding a small series resistor or ferrite bead may improve filtering of high-frequency ringing - especially in long traces - but is not required for basic compliance with IEC 61000-4-2 or ISO 10605. The SMB8J20CAHE3/5B datasheet confirms effective protection with zero series impedance in standard test configurations.
SMB8J20CAHE3/5B 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):
- 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)
SMB8J20CAHE3/5B FAQ
1.How can I place an order for SMB8J20CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J20CAHE3/5B 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 SMB8J20CAHE3/5B reliable?
The price and inventory of SMB8J20CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J20CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J20CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J20CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J20CAHE3/5B?
SMB8J20CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J20CAHE3/5B 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 SMB8J20CAHE3/5B?
For technical support, including SMB8J20CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J20CAHE3/5B requirements.
6.How does Aetrix verify that SMB8J20CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J20CAHE3/5B 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 SMB8J20CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J20CAHE3/5B?
All SMB8J20CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J20CAHE3/5B, 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 SMB8J20CAHE3/5B part is unused and in its original packaging.
Return procedure for SMB8J20CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J20CAHE3/5B Tags
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