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Vishay General Semiconductor - Diodes Division SMBJ20AHE3/52
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- Part No.:
- SMBJ20AHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20AHE3/52.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,501
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Product details
Overview
SMBJ20AHE3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal 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 a 10/1000 µs waveform - deployed in automotive ECUs, industrial I/O modules, and telecom interface circuits.
For engineers reviewing the SMBJ20AHE3/52 datasheet, SMBJ20AHE3/52 pinout, SMBJ20AHE3/52 application, or SMBJ20AHE3/52 equivalent, key selection criteria include its AEC-Q101 qualification, 1.0 µA max reverse leakage at VWM, -55 °C to +150 °C operating junction temperature range, and compatibility with automated SMT placement on standard PCB pad layouts per JEDEC DO-214AA footprint.
Technical Context
This TVS diode operates as a unidirectional clamping device: under normal bias it presents high impedance (<1.0 µA leakage at 20 V), but triggers into low-impedance conduction when transient voltage exceeds VBR (22.2–24.5 V), limiting downstream voltage to ≤32.4 V at 18.5 A. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns).
Thermally, it delivers 5.0 W steady-state power dissipation at TA = 50 °C with RθJA = 100 °C/W and RθJL = 20 °C/W, enabling reliable operation without heatsinking on standard 0.2" × 0.2" copper pads. The HE3 suffix confirms RoHS compliance and AEC-Q101 qualification for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - Maximum continuous reverse working voltage before significant leakage begins; defines safe operating margin for 24 V nominal systems. |
| VBR (Breakdown Voltage) | 22.2–24.5 V at 1 mA - Confirmed breakdown threshold range; ensures consistent triggering across production lots and temperature. |
| VC (Clamping Voltage) | 32.4 V at 18.5 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; enables IEC 61000-4-5 Level 4 compliance. |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy absorption capability for transient events up to 10/1000 µs; supports repetitive surges at 0.01% duty cycle. |
| IPPM (Peak Pulse Current) | 18.5 A - Maximum non-repetitive surge current handled without degradation; validated per Fig. 1 and Fig. 3 in datasheet 88392. |
| TJmax | +150 °C - Maximum junction temperature; allows operation in under-hood automotive environments and sealed industrial enclosures. |
| Leakage (ID) | ≤1.0 µA at 20 V - Minimal standby power loss and negligible impact on high-impedance sensor or reference circuits. |
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. Cathode indicated by band marking; polarity critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping loop when cathode is tied to protected line. |
| Cathode | High-side connection point | Connected to the line requiring protection (e.g., 24 V rail or RS-485 bus); conducts surge current to ground during overvoltage event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors - meets stress test requirements for temperature cycling, HTRB, and ESD. |
| 600 W peak pulse power (10/1000 µs) | Enables protection against severe transients such as ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Combination Wave surges without derating. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage performance across thermal and humidity stress; eliminates risk of junction corrosion in humid environments. |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT reflow profiles without preconditioning; eliminates moisture-related popcorning during assembly. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), improving protection margin for sensitive microcontrollers and CAN transceivers. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V supply inputs in engine control units (ECUs) against load dump and inductive switching spikes per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery rail and DC/DC input filter capacitor. Use Value: Limits transient voltage to ≤32.4 V, preventing damage to upstream regulators and downstream MCU power domains while maintaining AEC-Q101 compliance. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA loops) and digital I/O (e.g., RS-485) in programmable logic controllers (PLCs) exposed to field wiring surges. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between signal line and local ground plane, with minimal capacitance (<100 pF). Use Value: Suppresses EFT bursts and lightning-induced surges without distorting signal integrity due to low clamping voltage and fast response. |
| Telecom Line Interface Protection | Consumer Power Adapter Input Protection |
|
Use Scenario: Shielding Ethernet PHY interfaces and PoE injectors from induced surges on twisted-pair cabling in enterprise switches and base stations. IC Role / Device Role / Timing Role: Primary-level TVS on MDI lines, coordinated with secondary GDT or polymer PTC for multi-stage protection. Use Value: Clamps common-mode transients to <35 V, preserving PHY IC immunity margins and meeting IEC 61000-4-5 Level 3 requirements. |
Use Scenario: Adding secondary surge suppression on AC-DC adapter DC output rails feeding USB-C PD controllers or display power supplies. IC Role / Device Role / Timing Role: Final-stage clamping device after primary MOV and fuse, targeting residual fast transients missed by bulk protection. Use Value: Prevents latch-up or gate oxide damage in synchronous rectifiers and buck controllers by limiting voltage excursions to ≤32.4 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20AHM3/52 | Halogen-free, RoHS-compliant, AEC-Q101 qualified - identical electrical specs and package; differs only in material composition. | No functional difference; selected where halogen-free BOM compliance is mandated (e.g., EU medical or aerospace programs). | Choose SMBJ20AHM3/52 when halogen-free certification is required; otherwise SMBJ20AHE3/52 offers full equivalence with standard RoHS compliance. |
| SMBJ20A-E3/52 | Commercial-grade (non-AEC-Q101), same VWM/VBR/VC/PPPM, identical SMB package and pinout. | Not qualified for automotive use; suitable for consumer, computing, and non-safety-critical industrial applications. | Select SMBJ20A-E3/52 for cost-sensitive commercial designs where AEC-Q101 is not required; SMBJ20AHE3/52 remains mandatory for automotive Tier 1 sourcing. |
Compared with SMBJ20A-E3/52 and SMBJ20AHM3/52, the SMBJ20AHE3/52 uniquely combines AEC-Q101 qualification with standard RoHS compliance - making it the only option among the three approved for automotive powertrain and chassis modules without halogen restrictions.
Availability
SMBJ20AHE3/52 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial PLC I/O modules, and telecom infrastructure equipment requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ20AHE3/52 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness, AEC-Q101 validation, and precise clamping performance are mandatory.
FAQ
What is the clamping voltage of SMBJ20AHE3/52 at its rated peak pulse current?
The SMBJ20AHE3/52 has a maximum clamping voltage (VC) of 32.4 V at 18.5 A peak pulse current with a 10/1000 µs waveform. This value is measured per Figure 1 and Table on page 2 of Vishay datasheet 88392 and defines the upper voltage limit imposed on protected circuitry during standardized surge events. It directly determines whether downstream ICs remain within their absolute maximum ratings.
Is SMBJ20AHE3/52 suitable for automotive applications?
Yes, SMBJ20AHE3/52 is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and footnote (1) on page 3 of datasheet 88392. This qualification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and electrostatic discharge - making SMBJ20AHE3/52 appropriate for engine control, body electronics, and ADAS subsystems where automotive-grade reliability is mandatory.
What does the "HE3" suffix mean in SMBJ20AHE3/52?
The "HE3" suffix in SMBJ20AHE3/52 indicates RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information table (page 3, datasheet 88392), "HE3" denotes the halogen-free alternative is *not* required - this part meets RoHS but is not halogen-free, unlike "HM3". The "/52" denotes 7" tape-and-reel packaging with 750 units per reel.
How does SMBJ20AHE3/52 differ from bidirectional variants like SMBJ20CA?
SMBJ20AHE3/52 is unidirectional, with polarity marked by a cathode band and intended for DC rail protection where reverse voltage is blocked. In contrast, SMBJ20CA is bidirectional - symmetrical clamping in both directions - used for AC lines or differential data buses like RS-485. Electrical specs differ: SMBJ20CA has VWM = 20 V but dual VBR (±22.2–24.5 V), and no forward voltage drop specification.
What is the thermal resistance of SMBJ20AHE3/52, and how does it affect layout?
SMBJ20AHE3/52 has RθJA = 100 °C/W (junction-to-ambient) and RθJL = 20 °C/W (junction-to-lead), per page 3 of datasheet 88392. These values assume mounting on 0.2" × 0.2" copper pads per terminal. To maintain TJ ≤ 150 °C at 5.0 W dissipation, designers must provide adequate copper area and avoid excessive ambient temperature - underscoring the need for verified pad layout per the DO-214AA outline drawing on page 5.
SMBJ20AHE3/52 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ20AHE3/52 FAQ
1.How can I place an order for SMBJ20AHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20AHE3/52 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 SMBJ20AHE3/52 reliable?
The price and inventory of SMBJ20AHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20AHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ20AHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20AHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20AHE3/52?
SMBJ20AHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20AHE3/52 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 SMBJ20AHE3/52?
For technical support, including SMBJ20AHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20AHE3/52 requirements.
6.How does Aetrix verify that SMBJ20AHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ20AHE3/52 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 SMBJ20AHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ20AHE3/52?
All SMBJ20AHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20AHE3/52, 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 SMBJ20AHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ20AHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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