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Vishay General Semiconductor - Diodes Division SMBJ20CAHE3_A/I
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- Part No.:
- SMBJ20CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CAHE3_A/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,652
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Product details
Overview
SMBJ20CAHE3_A/I 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 and power lines. It features 20 V stand-off voltage (VWM), 32.4 V maximum clamping voltage (VC) at 18.5 A peak pulse current (IPPM), and 600 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ20CAHE3_A/I datasheet, SMBJ20CAHE3_A/I pinout, SMBJ20CAHE3_A/I application, or SMBJ20CAHE3_A/I equivalent, this device is selected for robust ESD and surge immunity in bidirectional AC-coupled or floating signal paths where low clamping ratio and AEC-Q101 qualification are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) ranging from 22.2 V to 24.5 V at 1.0 mA test current. Its clamping behavior is defined under standardized 10/1000 µs surge conditions, and thermal resistance is specified as 100 °C/W junction-to-ambient (RθJA) on minimum recommended pad layout.
The device uses a glass-passivated silicon junction and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. It is RoHS-compliant and AEC-Q101 qualified (denoted by HE3 suffix), supporting automotive-grade reliability without derating up to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 22.2–24.5 V at 1.0 mA - Voltage at which device enters avalanche conduction; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 32.4 V at IPPM = 18.5 A - Peak voltage seen by protected circuit during 10/1000 µs surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 600 W - Surge energy handling capability under standard waveform; enables protection against IEC 61000-4-5 Level 3/4 surges. |
| ID (Reverse Leakage) | 1.0 µA max at VWM - Low leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| TJ max | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive and industrial ambient environments. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated SMT assembly and IPC-7351B land patterns. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals with cathode/anode roles interchangeable depending on transient polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as anode or cathode depending on instantaneous voltage polarity; no fixed polarity designation. |
| Terminal 2 | Anode / Cathode (bidirectional) | Complementary terminal forming symmetrical avalanche path; enables clamping of positive and negative transients equally. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics - supports long-term reliability under thermal cycling and vibration. |
| 600 W peak pulse power | Handles IEC 61000-4-5 combination wave surges (e.g., 2 Ω source impedance, 1 kV/2 kV tests) without degradation when mounted per recommended pad layout. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage exposure to protected ICs - critical for safeguarding 3.3 V or 5 V logic interfaces adjacent to noisy power domains. |
| MSL Level 1 moisture sensitivity | Enables standard reflow without baking; eliminates production delays and moisture-related popcorning during assembly. |
| Glass-passivated junction | Improves long-term stability and reduces parameter drift under humidity and temperature stress versus epoxy-passivated alternatives. |
Applications
| Industrial Sensor Interface | Automotive CAN Bus Protection |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loops) from inductive switching transients in PLC I/O modules. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pair or single-ended signal line to clamp ±kV-level surges before reaching ADC or op-amp input stage. Use Value: Maintains signal fidelity by limiting transient overshoot to ≤32.4 V while drawing <1 µA at 20 V nominal - avoids loading precision sensor circuits. |
Use Scenario: Safeguarding CANH/CANL bus lines against load dump and ESD events in vehicle infotainment gateways. IC Role / Device Role / Timing Role: Parallel-connected TVS on each bus line to suppress fast-rising transients without distorting 1 Mbps CAN signaling waveform. Use Value: Clamps within nanoseconds with <100 ps response time, preserving bus timing margins and meeting ISO 16750-2 pulse 5a requirements. |
| Telecom Line Interface | AC-Coupled Data Link Protection |
|
Use Scenario: Shielding Ethernet PHY differential pairs (e.g., 10/100BASE-TX) from lightning-induced surges entering via RJ45 magnetics. IC Role / Device Role / Timing Role: Bidirectional TVS placed after common-mode choke to absorb differential-mode surges while maintaining CMRR. Use Value: Symmetrical clamping ensures equal protection on both lines, preventing data skew and bit errors during surge events. |
Use Scenario: Protecting USB 2.0 D+/D− lines in portable medical devices where AC coupling capacitors isolate DC bias. IC Role / Device Role / Timing Role: TVS installed between series capacitor and transceiver to clamp transients without disrupting DC blocking function. Use Value: Zero DC path to ground avoids compromising AC-coupling integrity while providing sub-33 V clamping during ESD contact discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA-E3/52 | Commercial-grade (non-AEC-Q101), same electrical specs and SMB package. | Lacks automotive qualification; suitable for industrial/commercial designs without automotive lifecycle or reliability mandates. | Select when AEC-Q101 is not required and cost optimization is prioritized. |
| SMCJ20CAHE3_A/I | Same VWM/VC/PPPM but in larger SMC (DO-214AB) package with higher thermal mass and RθJA = 50 °C/W. | Better suited for higher average power dissipation or sustained surge duty cycles due to improved heat spreading. | Choose when board space allows and thermal performance under repetitive surges is critical. |
Compared with SMBJ20CAHE3_A/I, the E3/52 variant offers identical surge protection at lower qualification cost, while the SMCJ20CAHE3_A/I delivers superior thermal resilience in high-duty-cycle environments - selection depends on automotive compliance needs and PCB thermal design constraints.
Availability
SMBJ20CAHE3_A/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive CAN bus protection, and telecom line protection requiring stable component supply across extended product lifecycles.
Supply support for SMBJ20CAHE3_A/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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series targets high-reliability transient suppression in space-constrained surface-mount applications - engineered for rapid response, low clamping, and compatibility with automated manufacturing and harsh-environment deployment.
FAQ
What is the maximum clamping voltage of SMBJ20CAHE3_A/I under standard surge conditions?
The SMBJ20CAHE3_A/I exhibits a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current of 18.5 A using the 10/1000 µs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMBJ20CAHE3_A/I suitable for automotive applications?
Yes, SMBJ20CAHE3_A/I is AEC-Q101 qualified, as confirmed by the "HE3" suffix and documentation in Vishay's 88392 datasheet. It undergoes stress testing for temperature cycling, humidity, mechanical shock, and surge endurance - making it appropriate for use in automotive ECUs, body control modules, and infotainment systems where reliability under extended temperature ranges (–55 °C to +150 °C) is mandatory.
How does the bidirectional configuration of SMBJ20CAHE3_A/I affect its placement on PCB?
The SMBJ20CAHE3_A/I has no polarity marking and functions identically regardless of orientation - both terminals serve as interchangeable anode/cathode nodes. This simplifies PCB layout by eliminating orientation checks during placement and enables direct integration into AC-coupled or floating differential signal paths without concern for mounting direction.
What is the thermal resistance of SMBJ20CAHE3_A/I, and how does it impact layout?
SMBJ20CAHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperatures under repeated surges, designers must adhere to this pad layout - reducing pad size increases thermal impedance and risks exceeding the +150 °C TJ max rating.
Does SMBJ20CAHE3_A/I meet industry surge immunity standards like IEC 61000-4-5?
Yes, SMBJ20CAHE3_A/I's 600 W peak pulse power rating with 10/1000 µs waveform aligns with IEC 61000-4-5 Level 3 (1 kV line-earth, 2 kV line-line) and Level 4 (2 kV line-earth, 4 kV line-line) test profiles when applied with appropriate source impedance. Its 32.4 V clamping voltage ensures protected circuits remain within safe operating limits during such standardized surge events.
SMBJ20CAHE3_A/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:
- 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):
- 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_A/I FAQ
1.How can I place an order for SMBJ20CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CAHE3_A/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 SMBJ20CAHE3_A/I reliable?
The price and inventory of SMBJ20CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ20CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CAHE3_A/I?
SMBJ20CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CAHE3_A/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 SMBJ20CAHE3_A/I?
For technical support, including SMBJ20CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CAHE3_A/I requirements.
6.How does Aetrix verify that SMBJ20CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ20CAHE3_A/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 SMBJ20CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ20CAHE3_A/I?
All SMBJ20CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CAHE3_A/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 SMBJ20CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMBJ20CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20CAHE3_A/I Tags
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DESD3V3E1BL-7B
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Diodes Incorporated
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