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Vishay General Semiconductor - Diodes Division P6SMB18A-M3/5B
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- Part No.:
- P6SMB18A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB18A-M3/5B.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,019
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Product details
Overview
P6SMB18A-M3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 15.3 V standoff voltage (VWM), 17.1–18.9 V breakdown voltage (VBR) at 1 mA, 25.2 V clamping voltage (VC) 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, industrial I/O modules, and telecom power supplies.
For engineers reviewing the P6SMB18A-M3/5B datasheet, P6SMB18A-M3/5B pinout, P6SMB18A-M3/5B application, or P6SMB18A-M3/5B equivalent, key selection criteria include its unidirectional polarity, SMB (DO-214AA) package compatibility, AEC-Q101 qualification readiness (via HM3 suffix variants), low incremental surge resistance, and 100 °C/W junction-to-ambient thermal resistance under standard PCB mounting.
Technical Context
The P6SMB18A-M3/5B operates as a clamping-type TVS diode that enters avalanche conduction when reverse voltage exceeds its specified VBR range (17.1–18.9 V). Its glass-passivated junction ensures stable breakdown behavior and fast response time (<1 ns), while the unidirectional configuration provides forward conduction path only during positive transients on the anode side.
Thermally, it is rated for TJ = –65 to +150 °C and exhibits 20 °C/W junction-to-lead thermal resistance. With 1.0 μA maximum reverse leakage at VWM, it minimizes standby power loss in battery-backed systems, and its MSL Level 1 rating supports lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 15.3 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin. |
| VBR (Breakdown Voltage) | 17.1–18.9 V at 1 mA - Confirmed avalanche initiation threshold; ensures reliable triggering above normal operating voltage. |
| VC (Clamping Voltage) | 25.2 V at 23.8 A (10/1000 μs) - Peak voltage seen by protected circuit during surge; determines downstream IC survivability. |
| PPPM (Peak Pulse Power) | 600 W - Sustained transient energy handling capacity; validates protection against IEC 61000-4-5 Level 3 surges. |
| RθJA | 100 °C/W - Thermal resistance under standard 0.2" × 0.2" copper pad layout; informs derating above 25 °C ambient. |
| IFSM | 100 A (8.3 ms half-sine) - Surge current tolerance in forward direction; supports inductive turn-off events in power switches. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place and reflow. |
Pinout & Package
SMB (DO-214AA) package: molded plastic case with matte tin-plated leads, UL 94 V-0 flammability rating, and cathode band marking for unidirectional polarity identification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance reference; carries full IPPM during clamping. |
| Cathode | Reverse-biased input / Protected line connection | Connected to line being protected (e.g., 12 V rail); blocks VWM but avalanches at VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Validates compliance with IEC 61000-4-5 surge immunity requirements for industrial and automotive electronics. |
| Glass passivated chip junction | Ensures long-term stability of VBR and low parameter drift across temperature and lifetime stress conditions. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture-related popcorning or delamination risks. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance mandates for global OEM shipments including EU, China, and South Korea. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic interfaces. |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between sensor supply rail and chassis ground. Use Value: Limits induced transients to ≤25.2 V, preventing damage to 36 V-rated automotive-grade op-amps and microcontrollers. |
Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers against field-wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input terminal block, upstream of optocoupler or Schmitt trigger. Use Value: Absorbs 600 W surges without degradation, enabling >100,000 insertion cycles per DIN rail module design. |
| Telecom Power Supply Rail Clamping | Consumer Appliance Motor Driver Protection |
Use Scenario: Secondary-side transient suppression on +12 V bias rails feeding Ethernet PHYs and PoE controllers in access equipment. IC Role / Device Role / Timing Role: Fast-response clamping device parallel to bulk capacitor, referenced to local ground plane. Use Value: Clamps 1 kV/500 A surges to 25.2 V within <1 ns, preserving integrity of IEEE 802.3af/at compliance margins. |
Use Scenario: Overvoltage protection on H-bridge gate drive supply rails in smart home appliances (e.g., washing machine motor control). IC Role / Device Role / Timing Role: Unidirectional TVS tied between 15 V gate driver rail and power ground. Use Value: Survives repeated 100 A inductive spikes from brushed DC motor commutation, extending MOSFET lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same SMB package, 18 V nominal, but lower PPPM (400 W) and higher VC (29.2 V at 13.7 A). | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); not suitable for IEC 61000-4-5 Level 4. | Select when cost sensitivity outweighs surge margin, and system-level testing confirms 29.2 V clamping is acceptable. |
| 1.5SMC18A | Higher-power SMC package (1500 W PPPM), same VWM/VBR, but larger footprint (7.11 mm × 6.22 mm) and 2× PCB area. | Used where board space permits and higher surge redundancy is required (e.g., outdoor telecom cabinets). | Choose only if 600 W is insufficient and layout allows SMC footprint; otherwise, P6SMB18A-M3/5B offers optimal density-to-performance ratio. |
Compared with SMAJ18A and 1.5SMC18A, the P6SMB18A-M3/5B delivers best-in-class power density (600 W in SMB), tighter VBR tolerance (±5.5%), and halogen-free compliance out-of-box - making it the preferred choice for space-constrained, high-volume automotive and industrial designs requiring AEC-Q101 readiness.
Availability
P6SMB18A-M3/5B is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC inputs, and telecom power supplies requiring stable component supply, halogen-free compliance, and MSL Level 1 reflow capability.
Supply support for P6SMB18A-M3/5B 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, TVS devices, and power MOSFETs with emphasis on reliability, ruggedness, and application-specific validation.
The P6SMB Series was engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping performance and AEC-Q101 qualification readiness are mandatory.
FAQ
What is the clamping voltage of P6SMB18A-M3/5B at its rated peak pulse current?
The P6SMB18A-M3/5B has a maximum clamping voltage (VC) of 25.2 V at 23.8 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events. The P6SMB18A-M3/5B maintains this clamping performance across its full operating temperature range (–65 °C to +150 °C), ensuring predictable protection behavior in automotive and industrial deployments.
Is P6SMB18A-M3/5B AEC-Q101 qualified?
The P6SMB18A-M3/5B itself is not AEC-Q101 qualified; however, Vishay offers AEC-Q101 variants under the HM3 suffix with revision code "B" (e.g., P6SMB18AHM3_B/I). The M3 suffix denotes halogen-free and RoHS-compliant construction, but qualification requires explicit HM3_B or HM3_H ordering codes. Engineers specifying P6SMB18A-M3/5B for automotive use must verify qualification status via Vishay's official part numbering guide and select the appropriate HM3_B variant to meet AEC-Q101 requirements.
What is the thermal resistance of P6SMB18A-M3/5B, and how does it affect layout?
The P6SMB18A-M3/5B 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. This value assumes standard FR-4 PCB construction and no internal layer copper planes. To maintain safe junction temperatures below 150 °C, designers must limit average power dissipation and ensure adequate copper area - especially critical in high-duty-cycle surge environments. The P6SMB18A-M3/5B's RθJL of 20 °C/W further supports heat transfer through leads into adjacent traces.
How does the M3 suffix differ from E3 in P6SMB18A-M3/5B?
The M3 suffix in P6SMB18A-M3/5B indicates halogen-free, RoHS-compliant construction with JESD 201 Class 2 whisker resistance, whereas E3 denotes standard RoHS compliance without halogen-free assurance. Both meet UL 94 V-0 and MSL Level 1, but M3 is required for strict environmental programs (e.g., Apple, Samsung, and EU EcoDesign). The P6SMB18A-M3/5B shares identical electrical specs with P6SMB18A-E3/5B - only material composition and compliance documentation differ. No layout or soldering process changes are needed when substituting M3 for E3.
Can P6SMB18A-M3/5B be used in bidirectional configurations?
No - P6SMB18A-M3/5B is strictly unidirectional, indicated by the "A" suffix and cathode band marking. Bidirectional operation requires the "CA" suffix (e.g., P6SMB18CA). Using P6SMB18A-M3/5B in a bidirectional application would result in forward conduction during negative transients, causing failure or incorrect clamping. For AC-coupled or symmetrical surge protection, engineers must select the corresponding CA variant or pair unidirectional devices back-to-back - the P6SMB18A-M3/5B is not rated for reverse conduction beyond its specified IR leakage.
P6SMB18A-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- P6SMB, TransZorb®
- Packaging:
- Tape & Box (TB)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
P6SMB18A-M3/5B FAQ
1.How can I place an order for P6SMB18A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB18A-M3/5B 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 P6SMB18A-M3/5B reliable?
The price and inventory of P6SMB18A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB18A-M3/5B is usually 5 days.
3.What payment methods are accepted for P6SMB18A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB18A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB18A-M3/5B?
P6SMB18A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB18A-M3/5B 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 P6SMB18A-M3/5B?
For technical support, including P6SMB18A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB18A-M3/5B requirements.
6.How does Aetrix verify that P6SMB18A-M3/5B is sourced from the original manufacturer or authorized distributors?
All P6SMB18A-M3/5B 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 P6SMB18A-M3/5B meets industry standards.
7.What is the process for return or replacement of P6SMB18A-M3/5B?
All P6SMB18A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB18A-M3/5B, 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 P6SMB18A-M3/5B part is unused and in its original packaging.
Return procedure for P6SMB18A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB18A-M3/5B Tags
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