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Vishay General Semiconductor - Diodes Division SMBJ20AHM3_A/I
- Part No.:
- SMBJ20AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20AHM3_A/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,785
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Product details
Overview
SMBJ20AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. 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 - deployed on power rails and signal lines in industrial motor drives.
For engineers reviewing the SMBJ20AHM3_A/I datasheet, SMBJ20AHM3_A/I pinout, SMBJ20AHM3_A/I application, or SMBJ20AHM3_A/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), halogen-free RoHS compliance, and real-world clamping behavior under surge conditions - critical for automotive-grade ESD and load-dump protection design validation.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its VBR threshold. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the low incremental surge resistance enables rapid energy diversion during transients.
Designed for mounting on 0.2" × 0.2" copper pads, it delivers 600 W peak pulse power handling with 0.01% duty cycle, derated above 25 °C per Fig. 2. The device meets MSL Level 1 per J-STD-020 and supports reflow up to 260 °C peak temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for 24 V nominal systems. |
| VBR @ IT = 1 mA | 22.2–24.5 V - Measured breakdown range confirming tight tolerance for predictable turn-on; ensures consistent protection across production lots. |
| VC @ IPPM = 18.5 A | 32.4 V - Clamped voltage during 10/1000 µs surge; limits downstream IC stress below 33 V, compatible with 3.3 V/5 V logic interfaces. |
| PPPM | 600 W - Peak pulse power dissipation capability; sustains single-event surges typical of ISO 7637-2 Pulse 1/2a/5a in automotive environments. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; determines self-heating under sustained leakage or repetitive pulses in confined PCB layouts. |
| TJmax | +150 °C - Maximum junction temperature; enables operation in under-hood automotive locations and industrial enclosures without active cooling. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; optimized for automated placement and high-density routing. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity marked by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential rail in unidirectional configuration; carries forward surge current up to 100 A (8.3 ms half-sine). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24 V supply); initiates avalanche conduction when transient exceeds VWM, shunting energy to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics; supports extended temperature cycling and humidity testing. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-204; eliminates brominated flame retardants and antimony trioxide for safer end-of-life processing. |
| 600 W peak pulse power | Handles ISO 16750-2 load-dump surges (up to 35 V, 100 ms) when used with series impedance; maintains clamping integrity after repeated events. |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage overshoot during fast transients; reduces risk of latch-up or gate oxide damage in MOSFET drivers and microcontrollers. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; supports direct placement into high-volume manufacturing lines with no pre-conditioning required. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Guarding |
|---|---|
|
Use Scenario: Protecting 24 V supply inputs in automotive ECUs against ISO 7637-2 Pulse 5a (load dump) and ISO 10605 ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp transients before they reach regulation circuitry. Use Value: Limits peak voltage to ≤32.4 V during 18.5 A surge, preventing overvoltage failure of buck controller ICs rated for 36 V absolute maximum. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from inductive switching noise in factory automation PLC modules. IC Role / Device Role / Timing Role: TVS connected between signal line and ground to absorb fast-rising spikes induced by relay coil de-energization. Use Value: Responds in <1 ps to clamp transients before they corrupt ADC sampling or trigger false fault detection in precision current-sense amplifiers. |
| Telecom DC Power Interface | Consumer Appliance Motor Drive Board |
|
Use Scenario: Safeguarding PoE-powered Ethernet switch ports against lightning-induced surges entering via DC input terminals. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V input rail upstream of hot-swap controller and DC-DC stage. Use Value: Absorbs 600 W surge energy without degradation, maintaining system uptime during Category C2/C3 surge events per IEC 61000-4-5. |
Use Scenario: Suppressing back-EMF spikes generated by brushed DC motors in smart home vacuum cleaners and robotic mowers. IC Role / Device Role / Timing Role: Mounted across motor terminals to clamp inductive kickback before it couples into MCU GPIOs or motor driver H-bridge. Use Value: Prevents latch-up in integrated half-bridge drivers (e.g., DRV8876) by limiting flyback voltage to 32.4 V, well below their 40 V VDS rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20AHE3_A/I | Same electrical specs and package, but RoHS-compliant commercial grade (non-AEC-Q101); no halogen-free certification. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs automotive reliability requirements and halogen-free material is not required. |
| SMAJ20A-M3 | Lower peak pulse power (400 W vs. 600 W); SMA (DO-214AC) package with smaller footprint (4.5 mm × 2.7 mm) and higher RθJA (140 °C/W). | Not recommended for sustained surge environments; limited thermal margin in high-ambient industrial settings. | Choose only for space-constrained consumer applications with lower-energy transients and ambient temperatures <70 °C. |
Compared with SMBJ20AHM3_A/I, SMBJ20AHE3_A/I offers identical protection performance without AEC-Q101 validation or halogen-free assurance, while SMAJ20A-M3 trades 33% lower surge capacity and inferior thermal performance for reduced board area - making SMBJ20AHM3_A/I the optimal choice for automotive and high-reliability industrial deployments.
Availability
SMBJ20AHM3_A/I is available at Aetrix Electronics and suitable for automotive ECU power conditioning, industrial sensor interface protection, and telecom DC input surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMBJ20AHM3_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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was developed specifically for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against load dump, ESD, and inductive switching is mission-critical.
FAQ
What is the maximum clamping voltage of SMBJ20AHM3_A/I under a 10/1000 µs surge?
The SMBJ20AHM3_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 standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, ensuring predictable overvoltage limiting for downstream components in the protected circuit.
Is SMBJ20AHM3_A/I qualified for automotive applications?
Yes, SMBJ20AHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix denoting halogen-free, RoHS-compliant, and automotive-grade construction. This qualification covers stress tests including temperature cycling, humidity bias, and mechanical shock - validating its suitability for under-hood and chassis-mounted electronic control units per automotive OEM requirements.
What does the "_A/I" suffix mean in SMBJ20AHM3_A/I?
The "_A/I" suffix in SMBJ20AHM3_A/I specifies packaging and reel configuration: "A" denotes the revision code (per Vishay's ordering nomenclature), and "I" indicates 13-inch diameter plastic tape-and-reel delivery with a base quantity of 3200 units. This format supports high-volume SMT assembly lines without manual handling or reel changeovers.
How does SMBJ20AHM3_A/I differ from SMBJ20A-M3?
SMBJ20AHM3_A/I is halogen-free and AEC-Q101 qualified, whereas SMBJ20A-M3 is halogen-free and RoHS-compliant but lacks automotive qualification. Both share identical electrical specs and SMB package, but SMBJ20AHM3_A/I adds validated reliability for automotive use cases - including extended temperature cycling and humidity testing beyond commercial-grade requirements.
Can SMBJ20AHM3_A/I be used in bidirectional configurations?
No, SMBJ20AHM3_A/I is a unidirectional TVS diode, as confirmed by its part number structure and datasheet designation. Bidirectional variants use the "CA" suffix (e.g., SMBJ20CA). Using SMBJ20AHM3_A/I in bidirectional applications would result in forward conduction during negative transients, potentially damaging the device or failing to protect the circuit.
SMBJ20AHM3_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:
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ20AHM3_A/I FAQ
1.How can I place an order for SMBJ20AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20AHM3_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 SMBJ20AHM3_A/I reliable?
The price and inventory of SMBJ20AHM3_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 SMBJ20AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ20AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20AHM3_A/I?
SMBJ20AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20AHM3_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 SMBJ20AHM3_A/I?
For technical support, including SMBJ20AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20AHM3_A/I requirements.
6.How does Aetrix verify that SMBJ20AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ20AHM3_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 SMBJ20AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ20AHM3_A/I?
All SMBJ20AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20AHM3_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 SMBJ20AHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ20AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20AHM3_A/I Tags
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