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Vishay General Semiconductor - Diodes Division SMBJ20CA-M3/52
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- Part No.:
- SMBJ20CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CA-M3/52.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,095
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Product details
Overview
SMBJ20CA-M3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the 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 a 10/1000 µs waveform - deployed on power rails and signal lines in industrial sensor interfaces and automotive control modules.
For engineers reviewing the SMBJ20CA-M3/52 datasheet, SMBJ20CA-M3/52 pinout, SMBJ20CA-M3/52 application, or SMBJ20CA-M3/52 equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal resistance (RθJA = 100 °C/W), halogen-free RoHS compliance (M3 suffix), and direct replacement guidance against comparable TVS diodes for surge-prone DC power and data line protection.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling single-device protection of AC-coupled or floating signal paths without polarity constraints. 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 reflects its reliance on PCB copper pad area (0.2" × 0.2") for effective power dissipation during transient events.
The device responds within picoseconds to ESD and lightning-induced transients, clamping voltages to ≤32.4 V at 18.5 A (10/1000 µs), with low incremental surge resistance enhancing energy absorption efficiency. It meets MSL Level 1 per J-STD-020 and supports automated SMT placement due to its low-profile SMB package and matte tin-plated terminals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC bias margin for protected circuitry. |
| VBR (min/max) | 22.2 V / 24.5 V at 1 mA - Confirmed breakdown threshold range; ensures reliable triggering above normal operating voltage. |
| VC @ IPPM | 32.4 V at 18.5 A - Clamped voltage during 600 W transient; determines maximum stress imposed on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; quantifies surge energy absorption capability. |
| IPPM | 18.5 A - Peak pulse current corresponding to VC; used to size PCB trace width and verify system-level surge margin. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; requires ≥5.0 mm × 5.0 mm copper pads per terminal for rated derating. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial environments. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant (M3 suffix), with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Bidirectional construction means no polarity marking; both terminals are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Either terminal serves as anode or cathode depending on transient polarity; no band marking required. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) on 24 V industrial buses without cascaded devices. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients, preserving margin for 3.3 V or 5 V logic interfaces downstream. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without pre-baking or special handling, reducing manufacturing cost and risk. |
| Halogen-free, RoHS-compliant (M3 suffix) | Fulfills environmental compliance requirements for EU, China RoHS, and major OEM sustainability programs. |
| 150 °C maximum junction temperature | Validates use in high-ambient environments such as motor drive enclosures and automotive body control modules. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting RS-485 transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching noise in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point, shunting transients before they reach signal conditioning circuitry. Use Value: Maintains signal integrity by limiting input voltage to ≤32.4 V during 18.5 A surges, preventing latch-up or damage to 5 V or 3.3 V interface ICs. |
Use Scenario: Safeguarding LIN bus nodes and microcontroller GPIOs from battery voltage spikes during jump-start or alternator load dump events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V supply rail and LIN data line, operating symmetrically to handle reversed polarity faults. Use Value: Withstands 600 W pulses without degradation, ensuring long-term reliability in automotive-grade designs meeting ISO 7637-2 Pulse 5a requirements. |
| Consumer Power Adapter Output | Telecom PoE Data Line |
|
Use Scenario: Secondary-side transient suppression on 19–20 V DC outputs of laptop adapters exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after DC-DC converter output filter, absorbing fast-rising transients before reaching USB-C PD controller. Use Value: 20 V VWM allows full utilization of adapter output headroom while clamping to 32.4 V - well below typical 36 V IC absolute maximum ratings. |
Use Scenario: Protection of Ethernet PHY differential pairs in IEEE 802.3af/at powered devices subjected to induced surges on data lines. IC Role / Device Role / Timing Role: Bidirectional TVS connected across each twisted pair, leveraging symmetry to suppress common-mode and differential transients. Use Value: Low capacitance (typ. <50 pF at 0 V) avoids signal integrity degradation at 100 Mbps, while 600 W rating covers telecom-grade surge immunity. |
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 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3). | Preferred for commercial-grade applications where halogen-free requirement is not mandated. | Select E3/52 when cost sensitivity outweighs halogen-free compliance; identical footprint and performance. |
| SMAJ20CA-M3 | Lower 400 W PPPM, higher VC (34.0 V), same VWM/VBR; SMA (DO-214AC) package with smaller pad area. | Suitable only for lower-energy transients; less thermal margin due to higher RθJA (~140 °C/W). | Choose SMAJ20CA-M3 only if board space is constrained and surge threat level is ≤IEC 61000-4-5 Level 2 (1 kV). |
Compared with SMBJ20CA-M3/52, the E3/52 variant offers identical protection performance with standard RoHS compliance, while the SMAJ20CA-M3 trades 33 % lower surge capacity and reduced thermal robustness for a 30 % smaller footprint - making SMBJ20CA-M3/52 the optimal choice for industrial and automotive applications demanding full 600 W rating and halogen-free materials.
Availability
SMBJ20CA-M3/52 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and consumer power adapter outputs requiring stable component supply, halogen-free compliance, and repeatable surge immunity performance across production batches.
Supply support for SMBJ20CA-M3/52 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, power 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 consistent clamping performance and long-term stability under repeated surge stress are critical.
FAQ
What is the maximum clamping voltage of SMBJ20CA-M3/52 at its rated peak pulse current?
The SMBJ20CA-M3/52 has a maximum clamping voltage (VC) of 32.4 V at its rated peak pulse current (IPPM) of 18.5 A, measured under the standardized 10/1000 µs double-exponential surge waveform. This value defines the highest voltage that will appear across protected circuitry during a full 600 W transient event, and it is guaranteed across the full operating temperature range. The SMBJ20CA-M3/52 maintains this clamping performance consistently due to its glass-passivated junction and low incremental surge resistance.
Is SMBJ20CA-M3/52 suitable for automotive applications requiring AEC-Q101 qualification?
No, SMBJ20CA-M3/52 is not AEC-Q101 qualified. It carries the M3 suffix indicating halogen-free, RoHS-compliant commercial grade construction. For automotive applications requiring AEC-Q101 validation, the equivalent part is SMBJ20CAHM3_X (e.g., SMBJ20CAHM3_B/H), which adds the HM3 suffix and revision code to denote qualification. The SMBJ20CA-M3/52 remains appropriate for non-automotive industrial and consumer systems where AEC-Q101 is not mandated.
How does the bidirectional design of SMBJ20CA-M3/52 affect its circuit placement and layout?
The bidirectional design of SMBJ20CA-M3/52 eliminates polarity concerns during placement: no cathode band marking is present, and either terminal functions identically regardless of voltage polarity. This simplifies layout for AC-coupled lines, differential pairs (e.g., RS-485, CAN), or floating grounds, allowing direct placement across signal pairs or supply/return without orientation verification. Layout must still adhere to the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad per terminal to maintain thermal performance and achieve rated 600 W pulse handling for the SMBJ20CA-M3/52.
What is the reverse leakage current specification for SMBJ20CA-M3/52 at its stand-off voltage?
The SMBJ20CA-M3/52 specifies a maximum reverse leakage current (ID) of 1.0 µA at its 20 V stand-off voltage (VWM), tested at TA = 25 °C. This low leakage ensures minimal power loss and signal interference in always-on circuits, such as battery-backed sensors or standby power rails. Leakage remains below 5 µA up to +85 °C, supporting reliable operation in extended temperature environments without compromising system quiescent current budgets for the SMBJ20CA-M3/52.
Can SMBJ20CA-M3/52 be used in place of a unidirectional TVS like SMBJ20A-M3/52?
No - SMBJ20CA-M3/52 and SMBJ20A-M3/52 are functionally distinct: the "CA" suffix denotes bidirectional operation, while "A" indicates unidirectional. Substituting SMBJ20CA-M3/52 for SMBJ20A-M3/52 on a DC rail with defined polarity may result in unintended forward conduction during normal operation, causing excessive leakage or failure. The SMBJ20CA-M3/52 is intended only for AC, floating, or polarity-agnostic protection; unidirectional applications require the "A" variant to preserve correct blocking behavior.
SMBJ20CA-M3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ20CA-M3/52 FAQ
1.How can I place an order for SMBJ20CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CA-M3/52 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 SMBJ20CA-M3/52 reliable?
The price and inventory of SMBJ20CA-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ20CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CA-M3/52?
SMBJ20CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CA-M3/52 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 SMBJ20CA-M3/52?
For technical support, including SMBJ20CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CA-M3/52 requirements.
6.How does Aetrix verify that SMBJ20CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ20CA-M3/52 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 SMBJ20CA-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ20CA-M3/52?
All SMBJ20CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CA-M3/52, 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 SMBJ20CA-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ20CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20CA-M3/52 Tags
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