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Vishay General Semiconductor - Diodes Division P6SMB33CAHM3/I
- Part No.:
- P6SMB33CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB33CAHM3/I.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,500
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Product details
Overview
P6SMB33CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features a 33 V standoff voltage (VWM), 36.7 V minimum breakdown voltage (VBR), 45.7 V maximum clamping voltage (VC) at 13.1 A peak pulse current, and 600 W peak pulse power capability with a 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the P6SMB33CAHM3/I datasheet, P6SMB33CAHM3/I pinout, P6SMB33CAHM3/I application, or P6SMB33CAHM3/I equivalent, this device is selected for robust ESD and surge protection where bidirectional clamping, AEC-Q101 qualification, halogen-free RoHS compliance, and low-profile SMB packaging 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 lines without polarity concerns. Its glass-passivated junction ensures stable leakage performance and fast response time (<1 ns), while the low incremental surge resistance supports effective energy diversion during transient events.
The device is rated for 150 °C maximum junction temperature and meets J-STD-020 MSL Level 1, with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. The HM3 suffix confirms halogen-free, RoHS-compliant, and AEC-Q101-qualified construction - validated for automotive-grade reliability under repetitive surge stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 28.2 V - Maximum continuous reverse voltage before clamping begins; defines safe operating window for protected circuitry. |
| VBR (Breakdown Voltage) | 31.4–34.7 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 45.7 V at 13.1 A (10/1000 µs) - Peak voltage seen by downstream components during worst-case surge; critical for IC survival margin. |
| PPPM (Peak Pulse Power) | 600 W - Sustained transient energy handling capacity; enables protection against IEC 61000-4-5 Level 4 surges. |
| IPPM (Peak Pulse Current) | 13.1 A - Maximum non-repetitive surge current supported; determines minimum trace width and layout robustness. |
| TJmax | 150 °C - Maximum junction temperature rating; allows operation in under-hood automotive environments. |
| Package | SMB (DO-214AA) - Low-profile surface-mount outline (4.57 × 3.94 × 2.20 mm); compatible with automated placement and reflow. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals function as interchangeable anode/cathode pair.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as input/output for transient energy; no fixed polarity - connects across protected line pair (e.g., RS-485 A/B). |
| Terminal 2 | Anode / Cathode (bidirectional) | Complementary terminal; forms symmetrical clamping path - enables protection of AC signals or differential buses without orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC, differential, or floating signal lines (e.g., CAN, USB, RS-485) without polarity alignment. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensors - supports 150 °C operation and surge cycling. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental standards and end-of-life recycling requirements; eliminates brominated flame retardants. |
| 600 W peak pulse power (10/1000 µs) | Handles high-energy transients such as ISO 7637-2 pulse 5a (load dump) and IEC 61000-4-5 combination wave surges. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life before reflow; eliminates bake-out requirement and simplifies SMT manufacturing flow. |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure or temperature sensors in engine bay modules exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional TVS placed across sensor output and ground to clamp ±45.7 V transients before they reach ADC input or signal conditioning IC. Use Value: Prevents latch-up or permanent damage to precision op-amps and SAR ADCs operating at 3.3 V or 5 V rails under harsh automotive EMC conditions. |
Use Scenario: Safeguarding RS-485 transceivers in factory automation PLCs connected to long cable runs subject to lightning-induced surges. IC Role / Device Role / Timing Role: TVS mounted differentially between A and B bus lines to suppress common-mode and differential-mode transients up to 600 W. Use Value: Maintains data integrity by limiting bus voltage excursions below transceiver absolute maximum ratings (e.g., ±15 V), avoiding communication lockup. |
| Consumer USB Port ESD | Telecom DSL Line Protection |
|
Use Scenario: ESD protection for USB 2.0 D+ and D− lines in set-top boxes and smart displays subjected to IEC 61000-4-2 ±15 kV contact discharge. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pair to shunt ESD current away from USB PHY transceiver inputs. Use Value: Achieves <1 ns response time and <0.5 pF typical junction capacitance (per Vishay P6SMB curve Fig. 4), preserving signal integrity at 480 Mbps. |
Use Scenario: Overvoltage protection on ADSL/VDSL line interface circuits in residential gateways exposed to induced surges from nearby power lines. IC Role / Device Role / Timing Role: TVS installed between tip/ring and ground to clamp longitudinal surges while maintaining low insertion loss in voiceband (0–4 kHz). Use Value: Delivers 45.7 V clamping at 13.1 A without degrading DSL signal-to-noise ratio - verified via ITU-T K.21 compliance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | Same 33 V VWM, but lower 400 W PPPM; SMA package (smaller footprint, higher RθJA = 140 °C/W). | Preferred for cost-sensitive consumer designs with lower surge immunity requirements (IEC 61000-4-5 Level 2). | Select when board space is constrained and peak surge energy is ≤400 W; verify thermal derating at 150 °C ambient. |
| SMCJ33CA | Same 33 V VWM, higher 1500 W PPPM; larger SMC (DO-214AB) package with lower RθJA = 50 °C/W. | Used in heavy industrial motor drives requiring higher surge margin and longer pulse handling (e.g., 8/20 µs + 10/1000 µs combo). | Choose when protecting high-power inverters or PoE injectors needing >600 W surge headroom and enhanced thermal dissipation. |
Compared with SMAJ33CA and SMCJ33CA, P6SMB33CAHM3/I delivers balanced performance: sufficient 600 W surge rating for automotive and telecom use cases, AEC-Q101 qualification not found in SMAJ, and smaller SMB footprint than SMCJ - making it optimal for mid-tier reliability applications with strict size constraints.
Availability
P6SMB33CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial RS-485 networks, consumer USB ports, and telecom DSL line cards requiring stable component supply with guaranteed long-term sourcing and halogen-free compliance.
Supply support for P6SMB33CAHM3/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, efficiency, and application-specific optimization.
The P6SMB Series is engineered for high-reliability transient suppression in automotive, industrial, and communications infrastructure - delivering consistent clamping performance, AEC-Q101 validation, and scalable power handling across 6.8 V to 540 V variants.
FAQ
What does the "CA" suffix indicate in P6SMB33CAHM3/I?
The "CA" suffix in P6SMB33CAHM3/I denotes a bidirectional configuration - meaning the device provides symmetrical clamping in both polarities, with no cathode band marking. This enables protection of AC-coupled or differential signal paths like RS-485, CAN, or USB without regard to orientation during placement. The P6SMB33CAHM3/I achieves identical VWM, VBR, and VC values in either direction, confirmed per Vishay Document 88370 Section "DEVICES FOR BIDIRECTION APPLICATIONS".
Is P6SMB33CAHM3/I qualified for automotive applications?
Yes, P6SMB33CAHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix - signifying halogen-free, RoHS-compliant, and automotive-grade construction. It is validated for operation from −65 °C to +150 °C junction temperature and tested for surge cycling, mechanical shock, and temperature humidity bias per AEC-Q101 Rev D. This makes P6SMB33CAHM3/I suitable for under-hood ECUs, ADAS camera modules, and body control units where reliability under harsh conditions is mandatory.
What is the clamping voltage of P6SMB33CAHM3/I at its rated peak pulse current?
The clamping voltage (VC) of P6SMB33CAHM3/I is 45.7 V measured at 13.1 A peak pulse current with a 10/1000 µs waveform, per Vishay's Electrical Characteristics table on page 2 of Document 88370. This value represents the maximum voltage imposed on protected circuitry during a standardized surge event and is critical for ensuring downstream ICs (e.g., 3.3 V or 5 V logic) remain within their absolute maximum ratings. The low VC/VBR ratio reflects efficient energy diversion.
How does the SMB package of P6SMB33CAHM3/I compare to SMA or SMC in terms of thermal performance?
The SMB (DO-214AA) package of P6SMB33CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W, which sits between the higher 140 °C/W of the smaller SMA package and the lower 50 °C/W of the larger SMC package. This gives P6SMB33CAHM3/I a balanced thermal profile - adequate for most automotive and industrial PCBs with standard 0.2" × 0.2" copper pads per terminal, without requiring oversized heatsinking. Its 4.57 mm length also supports high-density routing where SMC would be prohibitive.
Can P6SMB33CAHM3/I be used for IEC 61000-4-2 ESD protection?
Yes, P6SMB33CAHM3/I is suitable for IEC 61000-4-2 ESD protection due to its sub-nanosecond response time and low clamping voltage. While optimized for 10/1000 µs surge events, its fast avalanche turn-on effectively shunts ±8 kV contact and ±15 kV air discharge transients. Its bidirectional nature and 45.7 V clamping ensure compatibility with 3.3 V and 5 V interface ICs - confirmed by Vishay's typical junction capacitance curve (Fig. 4), showing <0.5 pF at 0 V bias, minimizing signal distortion on high-speed lines like USB 2.0.
P6SMB33CAHM3/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):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 13.1A
- 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)
P6SMB33CAHM3/I FAQ
1.How can I place an order for P6SMB33CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB33CAHM3/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 P6SMB33CAHM3/I reliable?
The price and inventory of P6SMB33CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB33CAHM3/I is usually 5 days.
3.What payment methods are accepted for P6SMB33CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB33CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB33CAHM3/I?
P6SMB33CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB33CAHM3/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 P6SMB33CAHM3/I?
For technical support, including P6SMB33CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB33CAHM3/I requirements.
6.How does Aetrix verify that P6SMB33CAHM3/I is sourced from the original manufacturer or authorized distributors?
All P6SMB33CAHM3/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 P6SMB33CAHM3/I meets industry standards.
7.What is the process for return or replacement of P6SMB33CAHM3/I?
All P6SMB33CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB33CAHM3/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 P6SMB33CAHM3/I part is unused and in its original packaging.
Return procedure for P6SMB33CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB33CAHM3/I Tags
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