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Vishay General Semiconductor - Diodes Division P6SMB20CAHM3/I
- Part No.:
- P6SMB20CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB20CAHM3/I.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P6SMB20CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, rated for 600 W peak pulse power (10/1000 μs), 20 V standoff voltage (VWM), and clamping voltage of 32.4 V at 18.3 A peak pulse current. It protects signal lines and power rails in automotive sensor interfaces, industrial I/O modules, and telecom line cards against ESD and inductive switching transients.
For engineers reviewing the P6SMB20CAHM3/I datasheet, P6SMB20CAHM3/I pinout, P6SMB20CAHM3/I application, or P6SMB20CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, MSL Level 1 rating, and thermal resistance (RθJA = 100 °C/W) under standard PCB pad layout.
Technical Context
This TVS diode operates symmetrically in both directions with no polarity marking, enabling protection of AC-coupled or differential signal paths without orientation constraints. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<5 μA at 20 V), while the 10/1000 μs waveform rating reflects real-world surge immunity per IEC 61000-4-5.
The device features fast response time (<1.0 ns), low incremental surge resistance, and meets JESD201 Class 2 whisker resistance. Its 150 °C maximum junction temperature and derating curve support operation in under-hood automotive environments when mounted on 5.0 mm × 5.0 mm copper pads per specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - Maximum continuous reverse voltage before clamping begins; defines operating margin below breakdown. |
| VBR (Breakdown Voltage) | 22.8 V to 25.2 V at 1.0 mA - Confirmed avalanche onset range; ensures reliable triggering above system operating voltage. |
| VC (Clamping Voltage) | 32.4 V at IPPM = 18.3 A - Peak voltage seen by protected circuit during 10/1000 μs transient; determines IC survival threshold. |
| PPPM (Peak Pulse Power) | 600 W - Sustained surge energy handling per single 10/1000 μs event; validates robustness against lightning-induced surges. |
| ID (Reverse Leakage) | ≤5 μA at 20 V - Minimal standby current draw; avoids signal distortion or battery drain in always-on circuits. |
| TJ max. | 150 °C - Enables deployment in high-temperature zones like engine control units or industrial motor drives. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient; requires minimum 5.0 mm × 5.0 mm copper pads for rated power dissipation. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow). Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); cathode band absent (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | No polarity marking; terminals interchangeable - enables bidirectional clamping across differential or AC signals. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - supports under-hood and ADAS sensor applications. |
| 600 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges without degradation - eliminates need for external series impedance in many designs. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage stress on downstream ICs - critical for protecting 3.3 V or 5 V logic interfaces with tight voltage margins. |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free SMT assembly processes without pre-baking - reduces manufacturing complexity and cost. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Fulfills environmental compliance requirements for global OEMs and industrial equipment - no brominated flame retardants or antimony trioxide. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Module |
|---|---|
Use Scenario: Protecting CAN FD transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt transients before reaching ASIC or MCU. Use Value: Maintains signal integrity during 12 V/24 V vehicle electrical disturbances; validated for AEC-Q101 stress conditions. |
Use Scenario: Safeguarding 24 V PLC digital input channels against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Primary overvoltage protection element across input terminals, working in concert with series current-limiting resistors. Use Value: Enables >100,000 surge cycles without parameter shift; clamps to ≤32.4 V to preserve optocoupler and microcontroller input thresholds. |
| Telecom Line Card Protection | Consumer USB-C Port ESD Guard |
Use Scenario: Shielding RS-485/RS-422 differential pairs in base station backhaul modules from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Symmetric TVS pair (one per line) referenced to ground, providing balanced clamping without skew. Use Value: Low capacitance (<100 pF at 0 V) preserves signal rise/fall times up to 10 Mbps; bidirectional operation matches differential signaling. |
Use Scenario: Secondary ESD protection on USB-C CC and SBU lines after primary polymer-based TVS, meeting IEC 61000-4-2 ±15 kV contact discharge. IC Role / Device Role / Timing Role: Fast-response silicon diode clamp absorbing residual energy that bypasses upstream protection. Use Value: Sub-1 ns response time prevents latch-up in USB PD controllers; 20 V VWM avoids interference with 5 V VBUS detection logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20CA-E3/5B | Same VWM (20 V), lower PPPM (400 W), SMA package (DO-214AC), non-AEC-Q101, RoHS-compliant only. | Limited to commercial-grade industrial or consumer use; unsuitable for automotive due to qualification gap and lower surge rating. | Select when cost sensitivity outweighs automotive qualification and 600 W surge headroom is unnecessary. |
| 1.5SMC20CA | Same VWM (20 V), identical PPPM (600 W), larger SMC (DO-214AB) package, AEC-Q101 available (HE3/HM3 variants), higher RθJA (~125 °C/W). | Requires more PCB area; thermal performance less favorable on same pad size; suitable where mechanical robustness or legacy footprint compatibility is prioritized. | Choose when board space allows larger footprint and existing SMC layout reuse is required without redesign. |
Compared with SMAJ20CA-E3/5B and 1.5SMC20CA, P6SMB20CAHM3/I delivers AEC-Q101 qualification, halogen-free compliance, and optimal thermal performance in the smallest standardized SMB footprint - making it the preferred choice for space-constrained, automotive-grade transient protection.
Availability
P6SMB20CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor systems, industrial programmable logic controllers, and telecom infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for P6SMB20CAHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The P6SMB Series targets high-reliability transient suppression in automotive, industrial, and telecom systems, designed to meet stringent surge immunity standards while supporting automated SMT assembly and environmental compliance.
FAQ
What is the clamping voltage of P6SMB20CAHM3/I at its rated peak pulse current?
The P6SMB20CAHM3/I has a maximum clamping voltage (VC) of 32.4 V at its specified peak pulse current (IPPM) of 18.3 A under a 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88370) and defines the upper voltage limit imposed on protected circuitry during transient events. The P6SMB20CAHM3/I maintains this clamping performance across its qualified operating temperature range.
Is P6SMB20CAHM3/I suitable for automotive applications?
Yes, P6SMB20CAHM3/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials (HM3 suffix), making it suitable for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. Its 150 °C maximum junction temperature, MSL Level 1 reflow rating, and validation against temperature cycling and HTRB ensure reliability in harsh vehicle environments. The P6SMB20CAHM3/I meets automotive-grade surge immunity requirements when applied per recommended PCB layout.
How does the bidirectional design of P6SMB20CAHM3/I affect its placement on the PCB?
The P6SMB20CAHM3/I has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. This simplifies automated assembly and enables use on AC-coupled lines, differential pairs (e.g., RS-485), or any signal path where voltage polarity may reverse. Unlike unidirectional TVS diodes, the P6SMB20CAHM3/I does not require cathode alignment - reducing placement errors and supporting flexible routing. Its symmetrical behavior is confirmed in the "DEVICES FOR BIDIRECTION APPLICATIONS" section of the Vishay P6SMB datasheet.
What is the thermal resistance of P6SMB20CAHM3/I, and how does it impact layout?
The P6SMB20CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as defined in the Vishay datasheet. This value assumes standard FR-4 PCB construction and dictates minimum copper area needed to sustain 5.0 W steady-state power dissipation or manage transient thermal spikes. Reducing pad size increases RθJA, risking junction overheating during repetitive surges - so the P6SMB20CAHM3/I must be laid out per the recommended mounting pad dimensions.
Does P6SMB20CAHM3/I have a specified junction capacitance, and why does it matter?
While the Vishay P6SMB datasheet does not list a guaranteed maximum junction capacitance for P6SMB20CAHM3/I, typical values for the P6SMB20CA variant are <100 pF at 0 V bias (per Fig. 4 in Document 88370). This low capacitance minimizes signal distortion and timing skew on high-speed lines such as USB, CAN, or RS-485 - critical when protecting data interfaces. For designs requiring precise capacitance limits, engineers should verify actual measurements or consult Vishay's characterization data for the HM3 variant, as process variations may slightly affect CJ in halogen-free versions.
P6SMB20CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- P6SMB, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 21.7A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
P6SMB20CAHM3/I FAQ
1.How can I place an order for P6SMB20CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB20CAHM3/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 P6SMB20CAHM3/I reliable?
The price and inventory of P6SMB20CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB20CAHM3/I is usually 5 days.
3.What payment methods are accepted for P6SMB20CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB20CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB20CAHM3/I?
P6SMB20CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB20CAHM3/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 P6SMB20CAHM3/I?
For technical support, including P6SMB20CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB20CAHM3/I requirements.
6.How does Aetrix verify that P6SMB20CAHM3/I is sourced from the original manufacturer or authorized distributors?
All P6SMB20CAHM3/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 P6SMB20CAHM3/I meets industry standards.
7.What is the process for return or replacement of P6SMB20CAHM3/I?
All P6SMB20CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB20CAHM3/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 P6SMB20CAHM3/I part is unused and in its original packaging.
Return procedure for P6SMB20CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB20CAHM3/I Tags
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