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Vishay General Semiconductor - Diodes Division SMBJ20CAHM3_A/I
- Part No.:
- SMBJ20CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CAHM3_A/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,117
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Product details
Overview
SMBJ20CAHM3_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 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 (IPPM), and 600 W peak pulse power (10/1000 µs waveform), used to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ20CAHM3_A/I datasheet, SMBJ20CAHM3_A/I pinout, SMBJ20CAHM3_A/I application, or SMBJ20CAHM3_A/I equivalent, this device is selected for robust ESD and surge protection where bidirectional clamping, low clamping ratio (VC/VBR ≈ 1.46), MSL Level 1 moisture sensitivity, and halogen-free RoHS compliance are required in space-constrained PCB layouts.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the 100 °C/W junction-to-ambient thermal resistance supports operation up to +150 °C junction temperature under defined pad layout conditions.
The device complies with ANSI/IEEE C62.35 for transient suppressor definitions and delivers repeatable 600 W surge handling at 0.01% duty cycle. Its fast response time (<1.0 ns) and low incremental surge resistance ensure effective suppression of lightning-induced surges and inductive switching transients before sensitive downstream components experience overvoltage stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 22.2–24.5 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during transients |
| VC (Clamping Voltage) | 32.4 V at IPPM = 18.5 A - Peak voltage seen by protected circuit during 600 W surge; determines safe voltage ceiling |
| PPPM (Peak Pulse Power) | 600 W (10/1000 µs) - Sustained transient energy absorption capability without failure |
| ID (Reverse Leakage) | ≤1.0 µA at VWM - Minimal standby power loss and signal integrity impact in high-impedance circuits |
| TJ max. | +150 °C - Enables use in under-hood automotive or high-temperature industrial environments |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.59 mm max length and 2.20 mm max height |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, qualified to JESD 201 Class 2 whisker test.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (reverse bias) | One terminal of symmetrical PN junction; conducts during positive or negative overvoltage events |
| Anode | Transient current entry (forward bias) | Same physical terminal functions as cathode during opposite-polarity surge due to bidirectional structure |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC, differential, or floating signal lines without polarity constraints |
| 600 W peak pulse power | Handles IEC 61000-4-5 Level 4 (4 kV) surge events on 50 Ω source impedance with margin |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak without baking, simplifying SMT assembly |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for industrial and telecom end-equipment certifications |
| Low clamping ratio (VC/VBR) | ≈1.46 - Minimizes overvoltage stress on protected ICs compared to higher-ratio alternatives |
Applications
| Industrial Motor Control Inputs | Automotive Body Control Module (BCM) Sensor Lines |
|---|---|
Use Scenario: Protection of 24 V DC input terminals against load dump and relay coil flyback transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to clamp ±100 V spikes within 1 ns. Use Value: Prevents damage to upstream voltage regulators and microcontroller GPIOs by limiting transient voltage to ≤32.4 V. |
Use Scenario: ESD and surge protection on LIN bus or analog sensor inputs (e.g., temperature, pressure) in BCM modules. IC Role / Device Role / Timing Role: Low-capacitance bidirectional suppressor placed at connector interface to shunt transients before signal conditioning circuitry. Use Value: Maintains signal fidelity with <1.0 µA leakage at 20 V while surviving ISO 10605 ±30 kV contact discharge. |
| Telecom Ethernet PHY Interface | Consumer Appliance Power Supply Feedback Loop |
Use Scenario: Secondary-side transient protection on 10/100BASE-TX transformer center taps and common-mode chokes. IC Role / Device Role / Timing Role: Symmetrical clamping device absorbing induced surges from nearby AC mains or lightning coupling. Use Value: Ensures PHY IC survival during IEC 61000-4-5 10/700 µs surges up to 2 kV without latch-up or parametric shift. |
Use Scenario: Overvoltage safeguard on optocoupler feedback path in isolated AC-DC SMPS for white goods. IC Role / Device Role / Timing Role: Fast-response TVS across TL431 reference input to prevent false triggering during line surges. Use Value: Guarantees stable regulation by limiting feedback node voltage to ≤32.4 V, avoiding premature shutdown or output overvoltage. |
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-E3/52 | RoHS-compliant commercial grade; no halogen-free certification; same electrical specs and SMB package | Lacks halogen-free declaration; not suitable for strict environmental compliance programs | Select when halogen-free requirement is absent and cost optimization is prioritized |
| SMBJ20CAHM3_A/H | Identical halogen-free and RoHS specs; differs only in tape-and-reel packaging (750 vs. 3200 units per reel) | No functional or electrical difference; reel size impacts procurement lot sizing and SMT feeder setup | Select when smaller reels align with production volume or inventory turnover targets |
Compared with SMBJ20CAHM3_A/I, the E3 variant trades halogen-free status for broader commercial availability, while the HM3_A/H differs solely in packaging quantity-both retain identical clamping performance, thermal behavior, and board-level reliability.
Availability
SMBJ20CAHM3_A/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom PHY interfaces, and consumer appliance power supplies requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ20CAHM3_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, precision, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting industrial automation, automotive electronics, and infrastructure equipment where robustness and regulatory compliance are mandatory.
FAQ
What is the clamping voltage of SMBJ20CAHM3_A/I at its rated peak pulse current?
The SMBJ20CAHM3_A/I has a maximum clamping voltage (VC) of 32.4 V when subjected to its peak pulse current (IPPM) of 18.5 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ20CAHM3_A/I maintains this clamping performance across its specified operating temperature range.
Is SMBJ20CAHM3_A/I suitable for automotive applications requiring AEC-Q101 qualification?
Yes, SMBJ20CAHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix and confirmed in Vishay's ordering information table. It meets the stress test requirements for automotive-grade discrete semiconductors, including temperature cycling, humidity bias, and mechanical shock. The SMBJ20CAHM3_A/I is approved for use in body electronics, infotainment interfaces, and sensor signal conditioning where transient immunity is critical.
How does the bidirectional design of SMBJ20CAHM3_A/I affect its placement on a PCB?
The SMBJ20CAHM3_A/I has no polarity marking and functions identically in both directions, eliminating orientation constraints during automated placement. Unlike unidirectional TVS diodes, it can be mounted without regard to anode/cathode alignment-ideal for protecting differential pairs, AC-coupled lines, or floating grounds. This simplifies layout, reduces assembly errors, and enables reuse across multiple signal topologies without redesigning footprint polarity.
What is the maximum reverse leakage current for SMBJ20CAHM3_A/I at its stand-off voltage?
The SMBJ20CAHM3_A/I exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 20 V stand-off voltage (VWM), measured at TA = 25 °C. This low leakage preserves signal integrity in high-impedance monitoring circuits and minimizes standby power loss in battery-powered systems. The SMBJ20CAHM3_A/I maintains this specification across its full operating temperature range, with leakage increasing predictably per datasheet derating curves.
Does SMBJ20CAHM3_A/I require special PCB layout considerations to achieve its rated 600 W pulse power?
Yes-the SMBJ20CAHM3_A/I achieves its rated 600 W peak pulse power only when mounted on the minimum recommended copper pad layout: 0.2" × 0.2" (5.0 mm × 5.0 mm) pads per terminal. Smaller pads increase thermal resistance, reducing surge capability. The SMBJ20CAHM3_A/I's RθJA of 100 °C/W assumes this layout; deviating from it requires derating per Figure 2 in the Vishay datasheet to avoid junction overheating during repetitive surges.
SMBJ20CAHM3_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:
- 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)
SMBJ20CAHM3_A/I FAQ
1.How can I place an order for SMBJ20CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CAHM3_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 SMBJ20CAHM3_A/I reliable?
The price and inventory of SMBJ20CAHM3_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 SMBJ20CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ20CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CAHM3_A/I?
SMBJ20CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CAHM3_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 SMBJ20CAHM3_A/I?
For technical support, including SMBJ20CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CAHM3_A/I requirements.
6.How does Aetrix verify that SMBJ20CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ20CAHM3_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 SMBJ20CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ20CAHM3_A/I?
All SMBJ20CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CAHM3_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 SMBJ20CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ20CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20CAHM3_A/I Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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