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Vishay General Semiconductor - Diodes Division SMBJ20CAHM3/I
- Part No.:
- SMBJ20CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20CAHM3/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,628
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Product details
Overview
SMBJ20CAHM3/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 power 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 (IPPM), and 600 W peak pulse power (10/1000 µs waveform), used in industrial sensor protection and automotive power rail surge suppression.
For engineers reviewing the SMBJ20CAHM3/I datasheet, SMBJ20CAHM3/I pinout, SMBJ20CAHM3/I application, or SMBJ20CAHM3/I equivalent, this page delivers verified electrical specs, bidirectional clamping behavior, thermal derating curves, AEC-Q101 qualification status, and halogen-free RoHS-compliant construction per Vishay Document 88392 (Rev. 09-Jan-2024).
Technical Context
This device operates as a voltage-clamped crowbar during transient events, with symmetrical forward/reverse conduction enabling bidirectional protection without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 µA at VWM), while MSL Level 1 moisture sensitivity supports lead-free reflow up to 260 °C peak.
The SMBJ20CAHM3/I exhibits 0.094 %/°C temperature coefficient of VBR and 20 °C/W junction-to-lead thermal resistance, allowing predictable clamping under elevated ambient conditions. Its 150 °C max junction temperature and 100 °C/W junction-to-ambient rating define safe continuous power dissipation limits when mounted on 5.0 mm × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC working margin. |
| VBR (min/max) | 22.2 V / 24.5 V at IT = 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 32.4 V at 18.5 A (10/1000 µs) - Clamping voltage seen by protected circuit under standardized surge stress. |
| PPPM | 600 W - Peak transient energy absorption capability; determines survivability against lightning or ESD-like pulses. |
| ID @ VWM | ≤1.0 µA - Reverse leakage current at rated stand-off voltage; critical for low-power sensor line integrity. |
| TJ max. | +150 °C - Maximum junction temperature defining thermal design headroom for PCB layout and power cycling. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated placement. |
Pinout & Package
Package: SMB (DO-214AA), molded case with matte tin-plated leads, MSL Level 1, J-STD-002 solderable. Bidirectional construction means no cathode/anode marking; terminals are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as input/output for transient energy; no polarity dependency in circuit layout. |
| Terminal 2 | Anode / Cathode (bidirectional) | Electrically identical to Terminal 1; enables symmetric placement across differential or single-ended lines. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V industrial buses. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics where reliability under thermal cycling and vibration is mandatory. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declarations for green manufacturing compliance. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., inductive switch-off), improving system-level immunity. |
| Fast response time (<1.0 ps) | Clamps before sensitive ICs (e.g., CAN transceivers, microcontrollers) experience damaging overvoltage stress. |
Applications
| Industrial Sensor Interface | Automotive Power Rail Protection |
|---|---|
|
Use Scenario: Protecting 24 V analog sensor outputs (e.g., pressure, temperature) from load dump and relay bounce in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal and ground to clamp ±1 kV transients without polarity concern. Use Value: Prevents sensor ADC saturation and microcontroller reset caused by 32.4 V clamping ceiling limiting downstream voltage excursion. |
Use Scenario: Safeguarding 12 V/24 V infotainment power inputs against ISO 7637-2 Pulse 5a (load dump) in passenger vehicles. IC Role / Device Role / Timing Role: Primary surge suppressor parallel to bulk capacitor on main power rail, activated within picoseconds. Use Value: Withstands 600 W peak power and 150 °C junction rating, maintaining protection integrity during repeated engine cranking cycles. |
| Telecom Line Interface | Consumer USB Port ESD Protection |
|
Use Scenario: Shielding RS-485 transceiver I/O pins from induced surges on long-distance field wiring in base station backhaul links. IC Role / Device Role / Timing Role: Bidirectional clamping element between differential pair and ground, leveraging symmetrical VBR. Use Value: 22.2–24.5 V VBR range aligns with common 24 V telecom supply rails, avoiding false triggering during normal operation. |
Use Scenario: Adding secondary surge defense on USB VBUS line in smart home hubs exposed to user-handling ESD and AC adapter transients. IC Role / Device Role / Timing Role: Secondary TVS after primary polymer PTC, absorbing residual 10/1000 µs energy missed by upstream protection. Use Value: 1.0 µA max ID at 20 V VWM prevents battery drain in always-on standby modes while clamping 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 |
|---|---|---|---|
| SMBJ20CAHE3/I | Same electrical specs, but RoHS-compliant commercial grade (not halogen-free); lacks AEC-Q101 qualification. | Suitable for non-automotive industrial use where halogen content is unrestricted and qualification not required. | Select SMBJ20CAHE3/I only if halogen-free material declaration is unnecessary and automotive qualification is not mandated. |
| SMAJ20CAHM3 | Lower PPPM (400 W vs. 600 W); same VWM/VBR/VC but smaller SMA package (DO-214AC) with higher RθJA (150 °C/W). | Acceptable for lower-energy transients or space-constrained layouts where 200 W margin reduction is acceptable. | Choose SMAJ20CAHM3 only when board area is critical and surge threat level is below IEC 61000-4-5 Level 3. |
Compared with SMBJ20CAHE3/I and SMAJ20CAHM3, the SMBJ20CAHM3/I uniquely combines AEC-Q101 qualification, halogen-free construction, and 600 W surge capacity in SMB package-making it the sole option for automotive-grade, environmentally compliant, high-energy protection.
Availability
SMBJ20CAHM3/I is available at Aetrix Electronics and suitable for industrial sensor interface, automotive power rail protection, and telecom line interface applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ20CAHM3/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, MOSFETs, and protection devices with emphasis on reliability and application-specific performance.
The SMBJ series was engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where consistent clamping and long-term stability are non-negotiable.
FAQ
What is the clamping voltage of SMBJ20CAHM3/I at its rated peak pulse current?
The SMBJ20CAHM3/I has a maximum clamping voltage (VC) of 32.4 V at 18.5 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per Vishay Document 88392 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ20CAHM3/I maintains this clamping performance across its full operating temperature range when properly mounted on recommended copper pad areas.
Is SMBJ20CAHM3/I suitable for automotive applications?
Yes, SMBJ20CAHM3/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and Vishay's ordering documentation. It meets the stress test requirements for automotive powertrain and body electronics, including temperature cycling, humidity bias, and mechanical shock. The SMBJ20CAHM3/I is explicitly designated for automotive use in Vishay's revision notes and qualifies for deployment in 12 V and 24 V vehicle subsystems where transient immunity is critical.
How does the bidirectional design of SMBJ20CAHM3/I affect circuit layout?
The bidirectional design of SMBJ20CAHM3/I eliminates polarity concerns during PCB placement-no cathode band marking exists, and both terminals are functionally identical. This allows symmetric routing across differential lines or single-ended paths without orientation checks, reducing assembly errors and enabling simplified layout for AC-coupled or floating interfaces. The SMBJ20CAHM3/I performs identically regardless of voltage polarity applied across its terminals.
What is the maximum reverse leakage current for SMBJ20CAHM3/I at its stand-off voltage?
The SMBJ20CAHM3/I 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 preserves signal integrity on high-impedance sensor lines and minimizes quiescent power loss in battery-powered systems. The SMBJ20CAHM3/I maintains this specification across its full -55 °C to +150 °C operating junction temperature range, with leakage increasing predictably per datasheet derating curves.
Does SMBJ20CAHM3/I meet RoHS and halogen-free compliance standards?
Yes, SMBJ20CAHM3/I carries the HM3 suffix, indicating halogen-free, RoHS-compliant construction per EU Directive 2011/65/EU and Vishay's material categorization standard (Document 99912). The molding compound meets UL 94 V-0 flammability rating, and terminals are matte tin plated per J-STD-002. This compliance is verified in Vishay's official ordering information table and applies to all units shipped under the SMBJ20CAHM3/I part number.
SMBJ20CAHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for SMBJ20CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20CAHM3/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/I reliable?
The price and inventory of SMBJ20CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMBJ20CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20CAHM3/I?
SMBJ20CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20CAHM3/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/I?
For technical support, including SMBJ20CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20CAHM3/I requirements.
6.How does Aetrix verify that SMBJ20CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ20CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMBJ20CAHM3/I?
All SMBJ20CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMBJ20CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ20CAHM3/I Tags
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