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Vishay General Semiconductor - Diodes Division P6SMB18CAHM3_B/I
- Part No.:
- P6SMB18CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB18CAHM3_B/I.pdf
- Description:
- 600W,18V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,777
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Product details
Overview
P6SMB18CAHM3_B/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the P6SMB series, designed for clamping voltage transients on signal or power lines. It features a 15.3 V stand-off voltage (VWM), 17.1–18.9 V breakdown voltage (VBR) at 1 mA test current, 25.2 V maximum clamping voltage at 23.8 A peak pulse current, and 600 W peak pulse power capability with a 10/1000 μs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the P6SMB18CAHM3_B/I datasheet, P6SMB18CAHM3_B/I pinout, P6SMB18CAHM3_B/I application, or P6SMB18CAHM3_B/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, SMB (DO-214AA) package thermal performance, and compliance with IEC 61000-4-2/4-5 surge immunity requirements in harsh environments.
Technical Context
This device operates as a bidirectional avalanche diode, symmetrically clamping transient overvoltages in both polarities without polarity dependence. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM), while the low incremental surge resistance enables precise voltage limiting during fast ESD or lightning-induced surges.
The P6SMB18CAHM3_B/I is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 100 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its MSL Level 1 rating (J-STD-020) and halogen-free, RoHS-compliant construction support high-reliability automated SMT assembly in automotive-grade production.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 15.3 V - Maximum continuous reverse voltage before clamping begins; defines safe operating window for protected circuitry. |
| VBR (Breakdown) | 17.1–18.9 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC (Clamping) | 25.2 V at 23.8 A (10/1000 μs) - Peak voltage seen by downstream ICs during worst-case surge; limits stress on 24 V-rated components. |
| PPPM | 600 W - Sustains high-energy transients (e.g., ISO 7637-2 Pulse 1/2b) without failure under defined duty cycle (0.01 %). |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint; optimized for thermal dissipation and automated placement. |
| AEC-Q101 | Qualified - Validated for automotive applications including engine control modules and ADAS sensor units per stress test requirements. |
| Leakage (ID) | ≤1.0 μA at VWM - Negligible standby current draw; avoids signal integrity degradation in high-impedance sensor lines. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts bidirectionally when voltage exceeds ±VBR - eliminates orientation concerns during layout. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN, LIN, RS-485) without external polarity management. |
| 600 W peak pulse power | Withstands automotive load-dump surges (ISO 7637-2) and ESD events (IEC 61000-4-2 ±15 kV contact) without degradation. |
| AEC-Q101 qualified (HM3_B/I) | Validated for automotive use: extended temperature cycling, HTRB, and mechanical shock testing per JESD22-A108/A110. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A; supports green manufacturing and end-of-life recycling compliance. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles; no moisture sensitivity handling required prior to assembly. |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay environments subject to ISO 7637-2 transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt surge energy before reaching ADC front-end. Use Value: Maintains signal fidelity under ±25 V transients while adding <0.5 mm² PCB area - critical for compact sensor modules. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to inductive switching noise. IC Role / Device Role / Timing Role: Fast-response TVS absorbing 600 W pulses from relay coil flyback, preventing false triggering of microcontroller GPIOs. Use Value: Clamps within <1 ns to limit voltage to 25.2 V - below MCU absolute maximum rating - without requiring series impedance. |
| Telecom Line Card Surge Protection | Consumer Appliance Motor Control |
Use Scenario: Shielding Ethernet PHY interface lines (e.g., PoE-powered devices) against lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary-level TVS on differential pairs, coordinated with secondary GDT or MOV stages for multi-stage protection. Use Value: Low capacitance (<100 pF at 0 V) preserves signal integrity up to 100 Mbps; bidirectional symmetry avoids skew in differential signaling. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, power tools). IC Role / Device Role / Timing Role: Clamp across motor terminals to prevent voltage reversal exceeding MOSFET drain-source rating during PWM shutdown. Use Value: 150 °C TJ max and 100 °C/W RθJA enable reliable operation in enclosed enclosures with ambient up to 85 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | Same VWM/VBR/VC specs but lower PPPM (400 W); SMA package (smaller footprint, higher RθJA = 140 °C/W). | Not AEC-Q101 qualified; suitable for commercial-grade consumer electronics only. | Select when board space is constrained and surge energy is limited to <400 W (e.g., USB port protection). |
| 1.5KE18CA | Higher PPPM (1500 W), axial-leaded DO-201 package; slower response due to higher parasitic inductance. | Requires through-hole mounting; unsuitable for high-density SMT designs or automotive vibration environments. | Choose for legacy systems needing higher surge margin where PCB real estate and assembly method permit axial components. |
Compared with SMAJ18CA and 1.5KE18CA, the P6SMB18CAHM3_B/I delivers automotive-grade reliability in an optimized SMT package, balancing 600 W surge capacity, low thermal resistance, and bidirectional symmetry - making it the preferred choice for new automotive and industrial designs requiring AEC-Q101 compliance and surface-mount scalability.
Availability
P6SMB18CAHM3_B/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom line-card surge suppression requiring stable component supply across long production lifecycles.
Supply support for P6SMB18CAHM3_B/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-energy transient suppression in automotive, industrial, and telecom systems - engineered for robustness under repetitive surge stress and compatibility with modern SMT manufacturing.
FAQ
What does the "CA" suffix indicate in P6SMB18CAHM3_B/I?
The "CA" suffix denotes a bidirectional configuration - meaning the P6SMB18CAHM3_B/I clamps transient overvoltages symmetrically in both polarities. This eliminates the need for polarity-aware placement and makes it ideal for protecting AC-coupled or floating signal paths such as CAN bus lines or differential sensor outputs, unlike unidirectional variants (e.g., P6SMB18A) that require cathode orientation.
Is P6SMB18CAHM3_B/I qualified for automotive applications?
Yes, the "HM3_B/I" suffix confirms that P6SMB18CAHM3_B/I is halogen-free, RoHS-compliant, and AEC-Q101 qualified. It has passed rigorous stress tests including high-temperature reverse bias (HTRB), temperature cycling, and mechanical shock - validating its suitability for under-hood and ADAS sensor applications where reliability under thermal and vibration stress is mandatory.
What is the maximum clamping voltage of P6SMB18CAHM3_B/I under surge conditions?
The P6SMB18CAHM3_B/I has a maximum clamping voltage (VC) of 25.2 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 23.8 A. This value is measured per industry-standard surge test conditions and ensures downstream components - such as 24 V-rated microcontrollers or transceivers - remain within safe operating voltage limits during transient events.
How does the SMB (DO-214AA) package of P6SMB18CAHM3_B/I compare thermally to larger packages?
The SMB package of P6SMB18CAHM3_B/I provides a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads - significantly better than SMA (140 °C/W) but higher than larger SMC packages (~50 °C/W). This balance allows effective heat dissipation in space-constrained automotive modules while maintaining compatibility with standard SMT reflow profiles.
Can P6SMB18CAHM3_B/I be used in place of a unidirectional TVS like P6SMB18AHM3_B/I?
No - P6SMB18CAHM3_B/I is bidirectional and lacks polarity marking, whereas P6SMB18AHM3_B/I is unidirectional with a defined cathode band. Substituting them requires verifying circuit topology: bidirectional use cases (e.g., differential buses) demand CA variants, while unidirectional DC rails require proper cathode orientation. Using P6SMB18CAHM3_B/I in a unidirectional design may result in unintended conduction during normal operation.
P6SMB18CAHM3_B/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.2V
- Current - Peak Pulse (10/1000µs):
- 23.8A
- 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)
P6SMB18CAHM3_B/I FAQ
1.How can I place an order for P6SMB18CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB18CAHM3_B/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 P6SMB18CAHM3_B/I reliable?
The price and inventory of P6SMB18CAHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB18CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for P6SMB18CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB18CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB18CAHM3_B/I?
P6SMB18CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB18CAHM3_B/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 P6SMB18CAHM3_B/I?
For technical support, including P6SMB18CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB18CAHM3_B/I requirements.
6.How does Aetrix verify that P6SMB18CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All P6SMB18CAHM3_B/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 P6SMB18CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of P6SMB18CAHM3_B/I?
All P6SMB18CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB18CAHM3_B/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 P6SMB18CAHM3_B/I part is unused and in its original packaging.
Return procedure for P6SMB18CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB18CAHM3_B/I Tags
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DESD3V3E1BL-7B
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