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Vishay General Semiconductor - Diodes Division P6SMB18AHM3_A/I
- Part No.:
- P6SMB18AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB18AHM3_A/I.pdf
- Description:
- TVS DIODE 15.3VWM 25.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,094
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Product details
Overview
P6SMB18AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the P6SMB series, designed for clamping voltage transients on power and signal lines. It features a 15.3 V stand-off voltage (VWM), 17.1–18.9 V breakdown voltage (VBR) at 1 mA, 25.2 V maximum 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-grade industrial power supplies and sensor interface protection.
For engineers reviewing the P6SMB18AHM3_A/I datasheet, P6SMB18AHM3_A/I pinout, P6SMB18AHM3_A/I application, or P6SMB18AHM3_A/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, SMB (DO-214AA) package dimensions, thermal resistance data, and real-world design implications for transient suppression in 12 V rail systems.
Technical Context
The P6SMB18AHM3_A/I operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast response time (<1 ns) and low incremental surge resistance. Its clamping behavior is defined by a well-controlled VC/IPPM relationship under 10/1000 μs transients, with thermal derating governed by RθJA = 100 °C/W and RθJL = 20 °C/W.
It is rated for continuous power dissipation of 5.0 W at TA = 50 °C, supports 100 A non-repetitive forward surge current (8.3 ms half-sine), and maintains operation across -65 °C to +150 °C junction temperature range. The device meets MSL Level 1 per J-STD-020 and is halogen-free, RoHS-compliant, and AEC-Q101 qualified (HM3 suffix).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 15.3 V - Maximum continuous reverse voltage before significant leakage; sets operating margin below clamping threshold in 12 V systems. |
| VBR (Breakdown) | 17.1–18.9 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above normal rail variation. |
| VC (Clamping) | 25.2 V at 23.8 A - Peak voltage seen by protected circuit during 600 W transient; limits stress on downstream MOSFETs or ICs. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 μs waveform; validates robustness against IEC 61000-4-5 surge events. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments with minimal heatsinking. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient; informs PCB copper pad sizing (0.2" × 0.2") for thermal management. |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements; required for engine control, ADAS, and body modules. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during positive transients when cathode is biased higher. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V supply); avalanches into conduction when voltage exceeds VBR, shunting surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables compliance with IEC 61000-4-5 Level 3 (1 kV/2 kV surge) without external current limiting in 12 V DC systems. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for Tier-1 production. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for sensitive 3.3 V or 5 V logic interfaces. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| Halogen-free & RoHS-compliant | Fulfills environmental compliance for global OEM programs and EU automotive directives (ELV, REACH). |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and inductive switching transients in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges up to ±100 V. Use Value: Limits peak voltage to 25.2 V during 600 W transients, preventing damage to LDOs and microcontrollers while meeting ISO 7637-2 Pulse 5a requirements. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC I/O modules in factory automation. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to suppress ESD (IEC 61000-4-2) and fast transients (IEC 61000-4-4) on 4–20 mA loops. Use Value: Sub-1 ns response time and 25.2 V clamping prevent latch-up or parametric shift in precision op-amps and ADC front-ends. |
| Telecom DC Power Input Protection | Consumer Device USB Power Path Protection |
|
Use Scenario: Securing 12 V/24 V DC inputs of PoE-powered network switches and base station radios exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device upstream of DC-DC converters, coordinated with MOVs for multi-stage protection. Use Value: 600 W rating and 100 A IFSM support high-energy surge handling without degradation over repeated events. |
Use Scenario: Adding overvoltage resilience to USB-C PD power delivery paths in portable medical monitors and smart home hubs. IC Role / Device Role / Timing Role: Standoff-rated TVS on VBUS line to absorb hot-plug spikes and adapter fault conditions before they reach USB controller ICs. Use Value: 15.3 V VWM provides headroom above 12 V PD profiles while clamping to 25.2 V - within safe operating area of USB PD PHYs. |
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 VWM (15.3 V), identical SMB package, but only commercial-grade (not AEC-Q101 qualified); RθJA = 110 °C/W. | Lacks automotive qualification and has higher thermal resistance - unsuitable for under-hood deployment or long-life field applications. | Select SMAJ18A only for cost-sensitive consumer or industrial designs where AEC-Q101 is not mandated. |
| 1.5SMC18A | Higher power rating (1500 W), larger SMC (DO-214AB) package, same VWM/VC specs; not footprint-compatible. | Requires PCB redesign due to larger 7.11 mm × 6.22 mm body vs. SMB's 4.57 mm × 3.94 mm; better for high-energy surges. | Choose 1.5SMC18A when system-level surge tests exceed 600 W or when board space allows larger package for improved thermal margin. |
Compared with SMAJ18A and 1.5SMC18A, the P6SMB18AHM3_A/I uniquely combines AEC-Q101 qualification, SMB footprint compatibility, and 600 W clamping performance - making it the optimal choice for automotive and high-reliability industrial designs requiring drop-in manufacturability and validated lifetime performance.
Availability
P6SMB18AHM3_A/I is available at Aetrix Electronics and suitable for automotive power distribution units, industrial sensor signal conditioning circuits, and telecom DC input stages requiring stable component supply, AEC-Q101 traceability, and consistent SMB (DO-214AA) packaging.
Supply support for P6SMB18AHM3_A/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, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The P6SMB series was engineered for high-power transient suppression in space-constrained, thermally demanding environments - particularly targeting automotive, industrial, and telecom infrastructure where AEC-Q101 compliance and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of the P6SMB18AHM3_A/I at its rated peak pulse current?
The P6SMB18AHM3_A/I 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 waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is critical for ensuring downstream components remain within their absolute maximum ratings. The P6SMB18AHM3_A/I achieves this clamping performance while maintaining low incremental surge resistance and fast response time.
Is the P6SMB18AHM3_A/I qualified for automotive applications?
Yes, the P6SMB18AHM3_A/I is AEC-Q101 qualified, as confirmed by the HM3 suffix and documentation in Vishay's P6SMB datasheet (Document Number 88370, Revision 09-Jan-2024). This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD - validating its suitability for automotive powertrain, chassis, and body electronics. The P6SMB18AHM3_A/I is explicitly designated for automotive use in the ordering information table.
What does the "HM3" suffix indicate in P6SMB18AHM3_A/I?
The "HM3" suffix in P6SMB18AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. The "H" indicates halogen-free molding compound, "M3" confirms RoHS compliance and JESD201 Class 2 whisker resistance, and the "_A/I" specifies tape-and-reel packaging (3200 units per 13″ reel). This full suffix ensures the P6SMB18AHM3_A/I meets stringent environmental and reliability requirements for automotive and industrial deployments.
How does the P6SMB18AHM3_A/I compare to bidirectional TVS diodes like P6SMB18CA?
The P6SMB18AHM3_A/I is unidirectional and intended for DC line protection where polarity is fixed (e.g., 12 V supply rails), offering lower leakage and tighter VBR tolerance than bidirectional variants. In contrast, P6SMB18CA is bidirectional and suited for AC-coupled or polarity-agnostic signals. The P6SMB18AHM3_A/I cannot replace P6SMB18CA in AC applications, and vice versa - selection depends strictly on circuit topology and voltage polarity requirements.
What is the thermal resistance specification for the P6SMB18AHM3_A/I?
The P6SMB18AHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead resistance (RθJL) of 20 °C/W, measured on the recommended 0.2″ × 0.2″ (5.0 mm × 5.0 mm) copper pad layout. These values directly inform PCB thermal design: for sustained 5.0 W power dissipation, ambient temperature must be limited to ≤50 °C to keep junction temperature below 150 °C. The P6SMB18AHM3_A/I's RθJA enables compact layouts without forced air cooling in most automotive and industrial enclosures.
P6SMB18AHM3_A/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:
- Obsolete
- 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:
- 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)
P6SMB18AHM3_A/I FAQ
1.How can I place an order for P6SMB18AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB18AHM3_A/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 P6SMB18AHM3_A/I reliable?
The price and inventory of P6SMB18AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB18AHM3_A/I is usually 5 days.
3.What payment methods are accepted for P6SMB18AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB18AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB18AHM3_A/I?
P6SMB18AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB18AHM3_A/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 P6SMB18AHM3_A/I?
For technical support, including P6SMB18AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB18AHM3_A/I requirements.
6.How does Aetrix verify that P6SMB18AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All P6SMB18AHM3_A/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 P6SMB18AHM3_A/I meets industry standards.
7.What is the process for return or replacement of P6SMB18AHM3_A/I?
All P6SMB18AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB18AHM3_A/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 P6SMB18AHM3_A/I part is unused and in its original packaging.
Return procedure for P6SMB18AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB18AHM3_A/I Tags
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Diodes Incorporated
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