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Vishay General Semiconductor - Diodes Division SMBJ20CAHE3/52
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- Part No.:
- SMBJ20CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CAHE3/52.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,266
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Product details
Overview
SMBJ20CAHE3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features a 20 V stand-off voltage (VWM), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, 32.4 V maximum clamping voltage (VC) at 18.5 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial and telecom systems.
For engineers reviewing the SMBJ20CAHE3/52 datasheet, SMBJ20CAHE3/52 pinout, SMBJ20CAHE3/52 application, or SMBJ20CAHE3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS diode operates symmetrically in both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM), while the 100 °C/W junction-to-ambient thermal resistance requires careful PCB pad design for sustained power dissipation.
The device meets MSL Level 1 per J-STD-020, supports lead-free reflow up to 260 °C peak, and is qualified to AEC-Q101 for automotive-grade reliability - confirmed by the "HE3" suffix denoting RoHS-compliant + AEC-Q101 qualification. It is not a unidirectional device and has no cathode/anode marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range. |
| VBR (min/max) | 22.2 V / 24.5 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during transients. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamped voltage under 600 W 10/1000 µs surge; limits stress on downstream components. |
| PPPM | 600 W - Peak pulse power handling capacity; validated per Fig. 1 derating curve with 0.01% duty cycle. |
| IPPM | 18.5 A - Peak surge current supported at VC; determines minimum trace width and pad area requirements. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood or high-ambient industrial environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, no polarity marking (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; no cathode band - bidirectional clamping across either terminal pair. |
| Case (body) | Thermal and mechanical interface | Non-electrical; serves as heatsink path via copper pads; requires 0.2" × 0.2" (5.0 mm × 5.0 mm) pad per terminal per datasheet note. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors - confirmed by HE3 suffix. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) when properly mounted on recommended copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage exposure during fast transients - critical for protecting 3.3 V or 5 V logic interfaces. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; compatible with J-STD-020 profile up to 260 °C peak. |
| Glass passivated junction | Ensures stable VBR over lifetime and temperature; reduces parameter drift vs. epoxy-passivated alternatives. |
Applications
| Industrial Motor Drives | Automotive Sensor Interfaces |
|---|---|
Use Scenario: Protection of encoder feedback lines and gate driver inputs against switching-induced transients in 24 V DC motor controllers. IC Role / Device Role / Timing Role: Bidirectional transient clamp placed directly at connector entry point before signal conditioning circuitry. Use Value: Limits induced spikes to ≤32.4 V, preventing latch-up or damage to isolated RS-422 receivers and microcontroller GPIOs. | Use Scenario: ESD and load-dump protection on LIN bus or analog sensor outputs (e.g., pressure, temperature) in passenger compartment modules. IC Role / Device Role / Timing Role: Primary front-end TVS on differential or single-ended sensor lines, compliant with ISO 10605 and ISO 7637-2 Pulse 5a. Use Value: AEC-Q101 qualification and 150 °C rating ensure reliability across full automotive temperature range (-40 °C to +125 °C ambient). |
| Telecom Power Feeds | Consumer USB-C Port Protection |
Use Scenario: Surge suppression on 48 V PoE-powered Ethernet switch ports exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-level TVS after primary GDT or MOV, clamping residual transients before DC-DC converter input. Use Value: 600 W rating and low VC enable coordination with upstream protectors while maintaining <100 ns response time. | Use Scenario: Bidirectional overvoltage protection on USB-C CC and VCONN lines susceptible to hot-plug transients and ESD. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF typical at 0 V) TVS placed adjacent to connector to minimize signal distortion. Use Value: Symmetrical clamping prevents polarity-dependent failure; SMB package allows dense layout near Type-C receptacle. |
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-M3/52 | Halogen-free, RoHS-compliant, commercial grade only - lacks AEC-Q101 qualification. | Not suitable for automotive applications requiring PPAP or reliability validation. | Select when cost-sensitive industrial designs do not require automotive qualification. |
| SMCJ20CAHE3/52 | Same electrical specs but in larger SMC (DO-214AB) package - higher thermal mass and 1500 W PPPM. | Used where higher surge margin or improved thermal performance is required despite larger board area. | Select when system-level surge testing exceeds 600 W or ambient temperatures exceed 105 °C. |
Compared with SMBJ20CAHE3/52, SMBJ20CA-M3/52 offers identical clamping performance without automotive qualification, while SMCJ20CAHE3/52 provides 2.5× higher surge power in a larger footprint - enabling trade-offs between board space, qualification scope, and robustness.
Availability
SMBJ20CAHE3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive sensor interfaces, telecom power feeds, and consumer USB-C port protection requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ20CAHE3/52 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, precision, and automotive-grade qualification.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for robust, standardized transient suppression in space-constrained surface-mount applications across automotive, industrial, and communications markets.
FAQ
What does the "CA" suffix mean in SMBJ20CAHE3/52?
The "CA" suffix in SMBJ20CAHE3/52 indicates a bidirectional configuration - meaning the device clamps voltage transients equally in both polarities, with no anode/cathode distinction. This differs from unidirectional "A" variants (e.g., SMBJ20AHE3/52), which conduct only in reverse bias and require correct polarity orientation during placement. The CA version is ideal for AC signal lines or floating interfaces.
Is SMBJ20CAHE3/52 qualified for automotive use?
Yes, SMBJ20CAHE3/52 is AEC-Q101 qualified, as confirmed by the "HE3" suffix (RoHS-compliant + AEC-Q101). It meets stress test requirements for temperature cycling, humidity, mechanical shock, and ESD, making it suitable for automotive applications including body control modules, infotainment interfaces, and sensor signal conditioning - provided layout follows Vishay's recommended pad dimensions and thermal guidelines.
What is the maximum clamping voltage of SMBJ20CAHE3/52 under surge conditions?
The maximum clamping voltage (VC) of SMBJ20CAHE3/52 is 32.4 V, measured at its peak pulse current (IPPM) of 18.5 A using the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring compatibility with 3.3 V, 5 V, or 24 V system rails.
Can SMBJ20CAHE3/52 replace SMBJ20AHE3/52 in an existing design?
No, SMBJ20CAHE3/52 cannot directly replace SMBJ20AHE3/52 without layout review. While both share identical VWM, VBR, and VC ratings, SMBJ20AHE3/52 is unidirectional and marked with a cathode band, whereas SMBJ20CAHE3/52 is bidirectional with no polarity marking. Substitution requires verifying that the protected circuit is symmetric or AC-coupled; otherwise, incorrect placement may result in unintended conduction or failed protection.
What is the thermal resistance of SMBJ20CAHE3/52, and how does it affect PCB layout?
SMBJ20CAHE3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes no additional heatsinking - so for repeated surges or elevated ambient temperatures, increasing copper area or adding thermal vias is necessary to maintain TJ ≤ 150 °C. Layout must follow Vishay's mounting pad dimensions in Document 88392, page 5.
SMBJ20CAHE3/52 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):
- 18.5A
- Power - Peak Pulse:
- 600W
- 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 (SMBJ)
SMBJ20CAHE3/52 FAQ
1.How can I place an order for SMBJ20CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CAHE3/52 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 SMBJ20CAHE3/52 reliable?
The price and inventory of SMBJ20CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ20CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CAHE3/52?
SMBJ20CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CAHE3/52 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 SMBJ20CAHE3/52?
For technical support, including SMBJ20CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CAHE3/52 requirements.
6.How does Aetrix verify that SMBJ20CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ20CAHE3/52 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 SMBJ20CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ20CAHE3/52?
All SMBJ20CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CAHE3/52, 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 SMBJ20CAHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ20CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20CAHE3/52 Tags
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