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Vishay General Semiconductor - Diodes Division SMBJ20HE3/52
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- Part No.:
- SMBJ20HE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20HE3/52.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,826
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Product details
Overview
SMBJ20HE3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping fast voltage transients on power and signal lines. It features 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 (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the SMBJ20HE3/52 datasheet, SMBJ20HE3/52 pinout, SMBJ20HE3/52 application, or SMBJ20HE3/52 equivalent, key selection criteria include clamping voltage margin relative to protected circuit's absolute maximum rating, thermal derating above 25 °C, AEC-Q101 qualification status, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping protection device triggered by reverse-biased avalanche breakdown. Its glass-passivated junction ensures stable VBR and low leakage (<1.0 µA at 20 V), while the low incremental surge resistance enables effective energy diversion during ESD or lightning-induced surges.
The SMBJ20HE3/52 is AEC-Q101 qualified and RoHS-compliant, with MSL Level 1 moisture sensitivity and matte tin-plated leads solderable per J-STD-002. Its thermal resistance (RθJA = 100 °C/W) requires careful PCB layout with adequate copper area to sustain repetitive surge duty cycles at ambient temperatures up to +150 °C junction limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal circuit operation. |
| VBR min/max | 22.2 V / 24.5 V at IT = 1 mA - guaranteed breakdown range defining turn-on threshold under transient stress. |
| VC @ IPPM | 32.4 V at 18.5 A - clamped voltage seen by protected circuit during full-rated 10/1000 µs surge; must stay below downstream IC's absolute max rating. |
| PPPM | 600 W - peak transient power it can absorb without failure; validated with 10/1000 µs waveform at 0.01% duty cycle. |
| TJ max | +150 °C - maximum junction temperature; limits sustained power dissipation and requires thermal design with ≥0.2" × 0.2" copper pads per terminal. |
| IFSM | 100 A - non-repetitive forward surge current rating (8.3 ms half-sine); relevant only if misapplied in forward bias. |
| Leakage ID | ≤1.0 µA at 20 V - ensures minimal standby power loss and signal integrity in high-impedance circuits. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with cathode band marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), compatible with standard SMT reflow profiles including peak of 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return plane; forms clamping loop with cathode during reverse surge. |
| Cathode | Protected line connection / avalanche node | Connected to line being protected (e.g., 24 V rail or sensor input); avalanche conduction occurs here during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| 600 W peak pulse power | Handles IEC 61000-4-5 Level 4 surge (4 kV line-earth) when properly mounted on recommended copper pads. |
| Glass-passivated junction | Ensures long-term stability of VBR and low parametric drift across temperature and lifetime. |
| MSL Level 1 rating | Zero floor life limitation; can be stored indefinitely before reflow without baking. |
| Matte tin-plated leads | Enables reliable solder joint formation per J-STD-002 and passes JESD22-B102 whisker testing Class 2. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between MCU GPIO and external load interface. Use Value: Limits transient voltage to ≤32.4 V during 18.5 A surges, preventing latch-up or oxide damage in 3.3 V/5 V logic interfaces. | Use Scenario: Safeguarding LIN bus transceivers and door module sensors from battery dump and load dump events. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply rail upstream of LDO regulators and communication ICs. Use Value: Clamps 20 V nominal rail to 32.4 V during ISO 7637-2 Pulse 5a (load dump), maintaining regulator input within safe operating range. |
| Consumer Power Adapters | Industrial PLC Analog Inputs |
Use Scenario: Secondary-side overvoltage suppression on DC output rails of AC/DC adapters subject to line transients. IC Role / Device Role / Timing Role: Unidirectional TVS connected between +VOUT and GND after secondary rectification and filtering. Use Value: Absorbs 600 W surges without degradation, preserving output regulation and preventing downstream capacitor overvoltage failure. | Use Scenario: Input protection for 4–20 mA current loop receivers exposed to field wiring surges in factory automation. IC Role / Device Role / Timing Role: Series-connected TVS on analog input path, referenced to isolated ground plane. Use Value: Maintains <1.0 µA leakage at 20 V, avoiding offset error in precision current-to-voltage conversion stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A-E3/52 | Commercial-grade version; not AEC-Q101 qualified; identical electrical specs and SMB package. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC compliance is not required. | Select SMBJ20A-E3/52 when cost optimization is prioritized and automotive qualification is unnecessary. |
| SAC20 | Same VWM (20 V) and VC (32.4 V), but in smaller SOD-123 package; lower IPPM (12.5 A) and PPPM (400 W). | Lower surge handling capacity; limited to lower-energy transients in space-constrained consumer applications. | Choose SAC20 only for compact layouts with verified sub-400 W surge exposure; not a drop-in replacement. |
Compared with SMBJ20A-E3/52, the SMBJ20HE3/52 adds AEC-Q101 qualification without electrical trade-offs; versus SAC20, it delivers 50% higher surge power handling and robustness for demanding industrial and automotive use cases.
Availability
SMBJ20HE3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and consumer power adapter designs requiring stable component supply with automotive-grade reliability and traceable sourcing.
Supply support for SMBJ20HE3/52 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, efficiency, and application-specific performance.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where immunity to ESD, EFT, and surge events is mission-critical.
FAQ
What is the clamping voltage of SMBJ20HE3/52 and how is it measured?
The SMBJ20HE3/52 has a maximum clamping voltage (VC) of 32.4 V, measured at its rated peak pulse current (IPPM) of 18.5 A using a standardized 10/1000 µs double-exponential surge waveform. This value represents the highest voltage the device allows across its terminals during full-rated transient energy absorption, and is critical for ensuring protected circuitry remains below its absolute maximum voltage rating. The test condition is defined in ANSI/IEEE C62.35 and confirmed per Vishay Document Number 88392.
Is SMBJ20HE3/52 suitable for automotive applications?
Yes, SMBJ20HE3/52 is AEC-Q101 qualified, making it suitable for automotive applications including body electronics, infotainment power rails, and sensor interfaces. Its qualification covers temperature cycling, humidity testing, mechanical shock, and surge endurance per the AEC standard. The "HE3" suffix explicitly denotes RoHS-compliant and AEC-Q101 qualified construction, distinguishing it from commercial-grade variants like SMBJ20A-E3/52.
What is the thermal resistance and how does it affect PCB layout for SMBJ20HE3/52?
The SMBJ20HE3/52 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. To maintain junction temperature below +150 °C under repetitive surge conditions, PCB layout must provide adequate copper area and avoid thermal bottlenecks. Derating curves in Figure 2 of Vishay Document 88392 show power capability drops significantly above 25 °C ambient, requiring thermal-aware placement near heat sinks or ground planes.
How does SMBJ20HE3/52 differ from bidirectional TVS diodes like SMBJ20CA?
SMBJ20HE3/52 is unidirectional and functions only in reverse breakdown - ideal for DC power rail protection where polarity is fixed. In contrast, SMBJ20CA is bidirectional and clamps surges of either polarity, suited for AC lines or differential signal pairs. The unidirectional SMBJ20HE3/52 offers lower leakage (<1.0 µA at 20 V) and avoids forward conduction issues on positive-going transients, whereas SMBJ20CA exhibits symmetrical clamping but higher leakage in both directions and no forward voltage drop specification.
What packaging and reel options are available for SMBJ20HE3/52?
SMBJ20HE3/52 is supplied in 7" diameter plastic tape and reel format with a base quantity of 750 units per reel (package code /52). It uses industry-standard SMB (DO-214AA) carrier tape per EIA-481, compatible with high-speed pick-and-place equipment. The part meets JESD201 Class 2 whisker resistance and is rated MSL Level 1, eliminating bake requirements prior to reflow. Alternate formats like 13" reels (/5B) are not available for the HE3 variant - only /52 is specified for AEC-Q101 qualified parts.
SMBJ20HE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 16.8A
- 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)
SMBJ20HE3/52 FAQ
1.How can I place an order for SMBJ20HE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20HE3/52 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 SMBJ20HE3/52 reliable?
The price and inventory of SMBJ20HE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20HE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ20HE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20HE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20HE3/52?
SMBJ20HE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20HE3/52 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 SMBJ20HE3/52?
For technical support, including SMBJ20HE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20HE3/52 requirements.
6.How does Aetrix verify that SMBJ20HE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ20HE3/52 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 SMBJ20HE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ20HE3/52?
All SMBJ20HE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20HE3/52, 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 SMBJ20HE3/52 part is unused and in its original packaging.
Return procedure for SMBJ20HE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20HE3/52 Tags
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