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Vishay General Semiconductor - Diodes Division P6SMB20AHM3/H
- Part No.:
- P6SMB20AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB20AHM3/H.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P6SMB20AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 20 V standoff voltage (VWM), 21.0 V maximum breakdown voltage (VBR), clamps transients to ≤27.7 V at 21.7 A peak pulse current, and delivers 600 W peak pulse power with a 10/1000 μs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the P6SMB20AHM3/H datasheet, P6SMB20AHM3/H pinout, P6SMB20AHM3/H application, or P6SMB20AHM3/H equivalent, key selection criteria include its AEC-Q101 qualification (HM3 suffix), SMB (DO-214AA) package compatibility, unidirectional polarity with cathode band marking, and thermal resistance of 100 °C/W junction-to-ambient - critical for high-reliability embedded power rail protection.
Technical Context
This TVS diode operates as a clamping device that enters avalanche conduction when reverse voltage exceeds VBR, limiting transient energy by diverting surge current to ground. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at 17.1 V), while MSL Level 1 rating supports lead-free reflow up to 260 °C.
The device is optimized for repetitive 10/1000 μs transients at 0.01% duty cycle and derates linearly above 25 °C ambient per Fig. 2. With 20 Ω typical junction-to-lead thermal resistance and 150 °C max junction temperature, it sustains surge events in constrained PCB layouts without active cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 17.1 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range on protected line. |
| VBR (Breakdown Voltage) | 19.0–21.0 V at 1.0 mA test current - Tight tolerance ensures predictable turn-on across production lots and temperature. |
| VC (Clamping Voltage) | 27.7 V at 21.7 A IPPM - Limits transient voltage seen by downstream ICs (e.g., microcontrollers, CAN transceivers) during ESD or load dump. |
| PPPM (Peak Pulse Power) | 600 W - Sustains high-energy surges (e.g., ISO 7637-2 Pulse 5a) without failure when mounted on 5.0 mm × 5.0 mm copper pads. |
| IPPM (Peak Pulse Current) | 21.7 A - Peak current handled during 10/1000 μs transient; determines minimum trace width and grounding strategy. |
| TJmax | 150 °C - Enables operation in under-hood automotive environments and industrial enclosures without thermal shutdown. |
| RθJA | 100 °C/W - Guides thermal design: at 5.0 W steady-state dissipation, ΔT = 500 °C - thus limited to pulsed operation only. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated terminals, RoHS-compliant and halogen-free (HM3 suffix). Cathode indicated by molded band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during surge. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units and ADAS sensor modules per stress test requirements. |
| Glass passivated junction | Ensures long-term stability of VBR and low leakage drift over temperature and lifetime - critical for safety-critical systems. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without popcorn cracking or delamination risk. |
| 600 W peak pulse power (10/1000 μs) | Meets ISO 16750-2 and IEC 61000-4-5 Level 4 surge immunity requirements for 12 V/24 V vehicle networks. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ESD >15 kV), improving protection margin for sensitive inputs. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) in engine bay modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between sensor output and MCU ADC input, referenced to chassis ground. Use Value: Clamps transients to ≤27.7 V, preventing damage to 3.3 V or 5 V ADC front-ends while maintaining <1.0 μA leakage at 17.1 V operating voltage. |
Use Scenario: Shielding digital input channels on programmable logic controllers against induced surges from nearby motor contactors or relay switching. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V DC input lines, positioned upstream of optocoupler or Schmitt trigger interface. Use Value: Absorbs 600 W pulses without degradation, enabling compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) immunity standards. |
| Telecom Power Rail Protection | Consumer Device USB Port Protection |
|
Use Scenario: Safeguarding 48 V PoE-powered Ethernet switch ports against lightning-induced surges on data and power pairs. IC Role / Device Role / Timing Role: Primary clamping device on DC input rail, coordinated with secondary GDT or polymer PTC for multi-stage protection. Use Value: Fast response time and low clamping voltage preserve integrity of DC-DC converters and PHY ICs during 10/1000 μs transients. |
Use Scenario: Adding robustness to USB 2.0 VBUS lines in portable medical monitors and smart home hubs subjected to user-handling ESD. IC Role / Device Role / Timing Role: Unidirectional TVS between VBUS and ground, sized to handle ±15 kV contact discharge per IEC 61000-4-2. Use Value: 27.7 V clamping prevents latch-up in USB power switches while maintaining low capacitance (<100 pF) to avoid signal integrity loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A-E3/5B | Same VWM/VBR/VC specs, but SMA package (DO-214AC); RθJA = 110 °C/W; no AEC-Q101 qualification. | Limited to commercial-grade industrial or consumer use; not suitable for automotive under-hood deployment. | Select when cost or legacy footprint compatibility outweighs automotive qualification and thermal performance needs. |
| 1.5SMC20A | Same electrical specs, but larger SMC (DO-214AB) package; higher IPPM (25.2 A); RθJA = 70 °C/W; AEC-Q101 available only in HE3 variant. | Better thermal handling for high-duty-cycle surges; requires larger PCB area and different pad layout. | Choose for designs needing higher surge endurance or where board space permits larger footprint and improved thermal margin. |
Compared with SMAJ20A-E3/5B and 1.5SMC20A, P6SMB20AHM3/H offers optimal balance of AEC-Q101 compliance, SMB footprint compactness, and 100 °C/W thermal resistance - making it preferred for space-constrained automotive ECUs and industrial edge nodes requiring validated reliability.
Availability
P6SMB20AHM3/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom power supplies requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for P6SMB20AHM3/H 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The P6SMB Series targets high-reliability transient suppression in automotive, industrial, and telecom systems - engineered for stable clamping, low leakage, and robust surge handling in surface-mount formats.
FAQ
What is the maximum clamping voltage of the P6SMB20AHM3/H under rated surge conditions?
The P6SMB20AHM3/H clamps to a maximum of 27.7 V at its rated peak pulse current of 21.7 A using a 10/1000 μs waveform. This value is guaranteed across temperature and production lot variations per Vishay's datasheet revision 09-Jan-2024, and defines the upper voltage limit imposed on protected circuitry during transient events. The P6SMB20AHM3/H maintains this clamping performance while operating within its 150 °C junction temperature limit.
Is the P6SMB20AHM3/H qualified for automotive applications?
Yes, the P6SMB20AHM3/H carries the HM3 suffix, indicating it is halogen-free, RoHS-compliant, and AEC-Q101 qualified. This certification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - validating its suitability for automotive powertrain, body control, and ADAS modules. The P6SMB20AHM3/H meets these requirements without derating in ambient temperatures up to 125 °C.
What does the "H" in P6SMB20AHM3/H signify in the ordering code?
The "H" denotes the packaging configuration: 7-inch diameter plastic tape and reel, containing 750 units per reel. This format supports automated SMT placement and is compatible with standard pick-and-place equipment. The full suffix "HM3/H" confirms halogen-free material (HM3) and 7″ reel (H); alternative options include "HM3/I" for 13″ reels (3200 units). The P6SMB20AHM3/H uses this configuration to ensure consistent feeding and traceability in high-volume manufacturing.
How does the thermal resistance of the P6SMB20AHM3/H affect PCB layout?
The P6SMB20AHM3/H has a typical RθJA of 100 °C/W, meaning each watt of dissipated power raises junction temperature by 100 °C above ambient. Since it is rated for pulsed operation only (not continuous DC), layout must prioritize low-inductance grounding and 5.0 mm × 5.0 mm copper pads per terminal per datasheet Fig. 2. Excessive trace length or undersized ground planes will increase effective RθJA, risking thermal runaway during repetitive surges. The P6SMB20AHM3/H relies on proper pad geometry-not heatsinks-for thermal management.
Can the P6SMB20AHM3/H be used in bidirectional protection circuits?
No, the P6SMB20AHM3/H is a unidirectional TVS diode, identified by its "A" suffix and cathode band marking. Bidirectional variants use the "CA" suffix (e.g., P6SMB20CA). Using P6SMB20AHM3/H in AC or floating-signal applications would result in forward conduction during negative half-cycles, causing failure. For bidirectional protection, select P6SMB20CHM3/H instead - the P6SMB20AHM3/H is strictly intended for DC rails with defined polarity.
P6SMB20AHM3/H 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 21.7A
- 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)
P6SMB20AHM3/H FAQ
1.How can I place an order for P6SMB20AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB20AHM3/H 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 P6SMB20AHM3/H reliable?
The price and inventory of P6SMB20AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB20AHM3/H is usually 5 days.
3.What payment methods are accepted for P6SMB20AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB20AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB20AHM3/H?
P6SMB20AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB20AHM3/H 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 P6SMB20AHM3/H?
For technical support, including P6SMB20AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB20AHM3/H requirements.
6.How does Aetrix verify that P6SMB20AHM3/H is sourced from the original manufacturer or authorized distributors?
All P6SMB20AHM3/H 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 P6SMB20AHM3/H meets industry standards.
7.What is the process for return or replacement of P6SMB20AHM3/H?
All P6SMB20AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB20AHM3/H, 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 P6SMB20AHM3/H part is unused and in its original packaging.
Return procedure for P6SMB20AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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