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Vishay General Semiconductor - Diodes Division P6SMB18A-M3/52
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- Part No.:
- P6SMB18A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB18A-M3/52.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,558
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Product details
Overview
P6SMB18A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, with 18 V breakdown voltage (VBR = 17.1–18.9 V at IT = 1.0 mA), 15.3 V stand-off voltage (VWM), and 25.2 V maximum clamping voltage (VC) at 23.8 A peak pulse current. It delivers 600 W peak pulse power (10/1000 μs waveform) for protecting MOSFETs, ICs, and sensor signal lines against inductive switching transients in industrial and automotive electronics.
For engineers reviewing the P6SMB18A-M3/52 datasheet, P6SMB18A-M3/52 pinout, P6SMB18A-M3/52 application, or P6SMB18A-M3/52 equivalent, this part serves as a halogen-free, RoHS-compliant TVS diode optimized for automated SMT placement, offering low incremental surge resistance, fast response time, and AEC-Q101 qualification eligibility via HM3 suffix variants.
Technical Context
The P6SMB18A-M3/52 operates as a unidirectional avalanche-clamping device with cathode-band polarity marking, designed to shunt transient energy above its 15.3 V reverse stand-off threshold while maintaining low leakage (<1.0 μA at VWM). Its glass-passivated junction ensures stable breakdown behavior under repetitive surges.
Thermal performance is defined by RθJA = 100 °C/W (junction-to-ambient, on 0.2" × 0.2" copper pads) and RθJL = 20 °C/W (junction-to-lead), supporting operation up to TJ = +150 °C. It meets MSL Level 1 per J-STD-020 with 260 °C reflow peak temperature tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V at 1.0 mA test current - defines precise avalanche onset range for reliable overvoltage triggering |
| VWM | 15.3 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM | 25.2 V at 23.8 A - clamped voltage during 600 W transient, limiting stress on downstream components |
| PPPM | 600 W (10/1000 μs waveform) - peak surge power handling capacity under standardized lightning/surge test condition |
| IPPM | 23.8 A - peak pulse current corresponding to VC, used to size PCB trace robustness and layout thermal relief |
| RθJA | 100 °C/W - thermal resistance indicating need for adequate copper pad area (0.2" × 0.2") to sustain power dissipation |
| TJ max | +150 °C - maximum junction temperature enabling use in under-hood automotive and industrial ambient environments |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode identified by band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to circuit ground or lowest potential node; completes conduction path during reverse transient |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 12 V rail or sensor output); conducts avalanche current when VAK > VBR |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 3/4 surges without derating in standard layouts |
| Glass passivated chip junction | Ensures long-term stability of VBR and low leakage across temperature and life cycles |
| MSL Level 1 moisture sensitivity | Allows direct placement without baking; compatible with standard 260 °C lead-free reflow profiles |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving clamping precision |
| AEC-Q101 qualified option (HM3 suffix) | Validates reliability for automotive powertrain and body electronics applications requiring qualification evidence |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails and switch-sense inputs in BCMs from load-dump and inductive kickback events. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between protected line and chassis ground to divert surge current away from microcontroller GPIOs and level translators. Use Value: Limits transient voltage to ≤25.2 V during 23.8 A surges, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers against field-wiring transients and relay coil flyback. IC Role / Device Role / Timing Role: Standoff-rated TVS connected in parallel with optocoupler input, conducting only when line voltage exceeds 15.3 V. Use Value: Maintains <1.0 μA leakage at 24 V nominal, ensuring clean logic-level detection while clamping spikes to safe levels within 1 ns response. |
| Consumer Appliance Motor Drive Board | Telecom Base Station Sensor Interface |
Use Scenario: Shielding Hall-effect position sensors and gate drivers on BLDC motor control boards from commutation noise and ESD. IC Role / Device Role / Timing Role: Localized TVS on low-voltage analog sensor lines (e.g., 5 V encoder outputs) referenced to system ground. Use Value: Clamps 10/1000 μs transients to 25.2 V with <50 ps response, preserving signal integrity and preventing ADC saturation or reset glitches. |
Use Scenario: Protecting RS-485 transceiver data lines and environmental sensor analog outputs in outdoor telecom cabinets exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary front-end TVS on differential bus lines, coordinated with secondary GDT or MOV stages for staged clamping. Use Value: Provides 600 W surge rating with 25.2 V clamping, enabling compliance with ITU-T K.21 basic protection requirements for Class B equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same SMB package, identical VBR (17.1–18.9 V), but rated at 400 W PPPM and higher VC (29.2 V) | Limited to lower-energy transients; less margin for IEC 61000-4-5 compliance in harsh environments | Select SMAJ18A only if system-level testing confirms 400 W suffices and board space constraints prevent upgrading to 600 W class |
| 1.5SMC18A | Higher-power SMC package (1500 W), same VBR/VWM, but larger footprint (7.11 mm × 6.22 mm vs. SMB's 4.57 mm × 3.94 mm) | Requires PCB redesign; suitable where sustained surge repetition or thermal cycling dominates design priority | Choose 1.5SMC18A when thermal management or multi-pulse endurance outweighs miniaturization goals |
Compared with SMAJ18A and 1.5SMC18A, the P6SMB18A-M3/52 uniquely balances 600 W surge capability, SMB footprint compatibility, and halogen-free compliance-making it optimal for space-constrained industrial and automotive modules needing verified transient immunity without layout revision.
Availability
P6SMB18A-M3/52 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input stages, and consumer appliance motor control boards requiring stable component supply, halogen-free compliance, and AEC-Q101-qualified alternatives.
Supply support for P6SMB18A-M3/52 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, power handling, and automotive-grade qualification.
The P6SMB series targets high-reliability transient suppression in automotive, industrial, and telecom systems, delivering standardized 600 W surge protection in compact SMB packages with scalable voltage options and qualification-ready variants.
FAQ
What is the clamping voltage of P6SMB18A-M3/52 at its rated peak pulse current?
The P6SMB18A-M3/52 has a maximum clamping voltage (VC) of 25.2 V at its rated peak pulse current (IPPM) of 23.8 A, measured under the standard 10/1000 μs double-exponential waveform. This value ensures downstream components like 3.3 V or 5 V logic interfaces remain within safe operating limits during surge events. The P6SMB18A-M3/52 achieves this clamping performance while maintaining low incremental surge resistance, critical for minimizing voltage overshoot.
Is P6SMB18A-M3/52 suitable for automotive applications?
Yes, the P6SMB18A-M3/52 is halogen-free and RoHS-compliant, and its base P6SMB18A family supports AEC-Q101 qualification via HM3 suffix variants (e.g., P6SMB18AHM3_B/H). While the -M3/52 suffix itself denotes commercial-grade halogen-free construction, it shares identical electrical and thermal characteristics with qualified versions-enabling direct qualification path and design reuse in automotive body electronics, infotainment power supplies, and sensor interfaces where transient immunity is critical.
How does the P6SMB18A-M3/52 differ from bidirectional TVS diodes like P6SMB18CA?
The P6SMB18A-M3/52 is unidirectional, featuring a cathode band for polarity-sensitive placement and optimized for DC-biased lines such as 12 V or 24 V supply rails. In contrast, P6SMB18CA is bidirectional with no polarity marking and symmetric clamping in both directions-used in AC-coupled or floating signal lines like RS-485 or audio paths. Their VBR, VWM, and PPPM ratings differ: P6SMB18CA has VWM = 15.3 V (same), but VBR = 17.1–18.9 V in both directions and is not rated for forward conduction.
What is the thermal resistance of P6SMB18A-M3/52, and how does it affect PCB layout?
The P6SMB18A-M3/52 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 minimum recommended pad layout per Vishay's datasheet; reducing pad area increases RθJA, risking thermal runaway during repetitive surges. To maintain reliability, designers must allocate sufficient copper area and avoid excessive trace length between the P6SMB18A-M3/52 and ground plane.
Does P6SMB18A-M3/52 require derating at elevated ambient temperatures?
Yes, the P6SMB18A-M3/52 requires derating above TA = 25 °C, as shown in Figure 2 of its datasheet. Its peak pulse power capability decreases linearly: at 85 °C ambient, PPPM drops to ~70 % of 600 W (~420 W), and at 125 °C, it falls to ~40 % (~240 W). This derating applies to repetitive surge conditions; single-event transients are unaffected. System-level thermal analysis must account for this to ensure P6SMB18A-M3/52 remains within safe operating area during worst-case ambient and power dissipation scenarios.
P6SMB18A-M3/52 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-M3/52 FAQ
1.How can I place an order for P6SMB18A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB18A-M3/52 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-M3/52 reliable?
The price and inventory of P6SMB18A-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB18A-M3/52 is usually 5 days.
3.What payment methods are accepted for P6SMB18A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB18A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB18A-M3/52?
P6SMB18A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB18A-M3/52 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-M3/52?
For technical support, including P6SMB18A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB18A-M3/52 requirements.
6.How does Aetrix verify that P6SMB18A-M3/52 is sourced from the original manufacturer or authorized distributors?
All P6SMB18A-M3/52 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-M3/52 meets industry standards.
7.What is the process for return or replacement of P6SMB18A-M3/52?
All P6SMB18A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB18A-M3/52, 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-M3/52 part is unused and in its original packaging.
Return procedure for P6SMB18A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB18A-M3/52 Tags
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