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Taiwan Semiconductor Corporation P6SMB18AH
- Part No.:
- P6SMB18AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB18AH.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,976
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Product details
Overview
P6SMB18AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade circuit protection. It features a 17.1–18.9 V breakdown voltage (VBR), 15.3 V stand-off voltage (VWM), 25 A peak pulse current (IPPM), and clamps transients to ≤25.5 V at rated surge, meeting ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics.
For engineers reviewing the P6SMB18AH datasheet, P6SMB18AH pinout, P6SMB18AH application, or P6SMB18AH equivalent, key selection criteria include its AEC-Q101 qualification, DO-214AA (SMB) package compatibility with automated SMT assembly, low leakage (<1 µA @ 15.3 V), and fast sub-1 ps response time-critical for protecting CAN, LIN, and sensor interfaces in harsh environments.
Technical Context
The P6SMB18AH operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve stable, repeatable clamping under repetitive 10/1000 µs surge waveforms. Its 600 W peak pulse power rating (PPPSM) is derated linearly above 25°C ambient per JESD22-A103, with thermal resistance RθJA = 55 °C/W enabling reliable operation up to TJ = +150 °C.
It exhibits a temperature coefficient of VBR = 0.088 %/°C, ensuring predictable voltage drift across automotive temperature ranges. The device's low forward voltage (VF = 3.5 V @ 50 A) minimizes conduction loss during fault conditions, while its <1 µA reverse leakage at VWM preserves system standby power integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V - defines minimum and maximum guaranteed breakdown threshold at 1 mA test current |
| VWM | 15.3 V - maximum continuous reverse operating voltage before significant leakage begins |
| IPPM | 25 A - peak surge current it safely clamps at 10/1000 µs waveform without degradation |
| VC@IPPM | ≤25.5 V - clamped voltage seen by protected circuit during full-rated surge event |
| PPPSM | 600 W - non-repetitive peak pulse power dissipation capability per ISO 7637-2 |
| TJ max | +150 °C - maximum junction temperature supporting under-hood automotive placement |
| Leakage @ VWM | <1 µA - ensures negligible standby current draw in always-on vehicle subsystems |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, low-profile case with matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Cathode indicated by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., CAN_H, LIN, sensor supply); conducts when line exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock per stress test requirements |
| Glass-passivated junction | Ensures long-term stability and reliability of VBR and leakage performance under thermal and humidity stress |
| ISO 7637-2 compliance | Guarantees robust immunity against load dump, inductive switching, and EFT transients in 12 V vehicle systems |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or special handling per J-STD-020 |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS directives for environmentally compliant automotive manufacturing |
Applications
| Automotive CAN Bus Protection | Body Control Module (BCM) Power Input |
|---|---|
Use Scenario: Protecting high-speed CAN transceivers from battery load dump and alternator ripple-induced surges. IC Role / Device Role: Unidirectional TVS placed between CAN_H/CAN_L lines and ground to clamp common-mode transients. Use Value: Limits voltage excursion to ≤25.5 V, preserving transceiver integrity without adding signal distortion or capacitance-induced timing skew. | Use Scenario: Safeguarding 12 V input rails of BCM microcontrollers and driver ICs against ignition-induced spikes. IC Role / Device Role: Primary overvoltage clamp on main power rail upstream of LDOs and PMICs. Use Value: Absorbs 600 W surges while maintaining VWM = 15.3 V, allowing uninterrupted operation during cold-crank and jump-start events. |
| LED Headlamp Driver Protection | Passive Entry RF Receiver Input |
Use Scenario: Shielding constant-current LED drivers from inductive kickback during PWM dimming and relay switching. IC Role / Device Role: Reverse-biased TVS across driver output to suppress flyback voltage spikes. Use Value: Clamps transients within 1 ps, preventing gate oxide damage to MOSFETs and avoiding false triggering of overvoltage shutdown circuits. | Use Scenario: Guarding 315/433 MHz RF receiver antenna inputs against ESD and electrostatic discharge in key fob detection circuits. IC Role / Device Role: Low-capacitance TVS (CJ ≈ 100 pF @ 0 V) placed inline with RF trace to ground. Use Value: Provides <1 µA leakage at 15.3 V, minimizing DC loading on high-impedance RF front-end while meeting IEC 61000-4-2 Level 4 ESD immunity. |
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 DO-214AC (SMA) package; 18 V nominal VBR, but lower PPPSM = 400 W and higher VC = 29.2 V | Limited to lower-energy transients; not AEC-Q101 qualified | Select when cost sensitivity outweighs automotive qualification and 600 W surge margin |
| 1.5SMC18A | DO-214AB (SMC) package; same 18 V rating, PPPSM = 1500 W, but 2.5× larger footprint and higher thermal mass | Better for under-hood high-power modules where PCB space allows | Choose when higher surge endurance is required and SMB footprint constraint does not apply |
Compared with SMAJ18A and 1.5SMC18A, the P6SMB18AH delivers optimal balance of AEC-Q101 compliance, 600 W surge capacity, and compact DO-214AA footprint-making it the preferred choice for space-constrained, automotive-grade 12 V rail protection where reliability and manufacturability are critical.
Availability
P6SMB18AH is available at Aetrix Electronics and suitable for automotive infotainment systems, body control modules, and LED lighting systems requiring stable component supply with full traceability and lifecycle management.
Supply support for P6SMB18AH 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and automotive-qualified power devices.
The P6SMB18AH belongs to TSC's AEC-Q101-certified P6SMB series-engineered specifically for robust transient suppression in 12 V automotive electrical systems, with emphasis on ISO 7637-2 compliance and automated SMT compatibility.
FAQ
What is the polarity configuration of the P6SMB18AH?
The P6SMB18AH is a unidirectional TVS diode, with cathode marked by a band on the DO-214AA (SMB) package. It conducts only when the cathode is biased positively relative to the anode-ideal for protecting positive-rail signals like CAN_H or 12 V supplies. Its unidirectional structure provides lower leakage than bidirectional variants, making it suitable for DC-coupled applications where reverse conduction must be avoided.
Does the P6SMB18AH meet automotive qualification standards?
Yes, the P6SMB18AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. This certification covers temperature cycling, mechanical shock, and humidity testing-ensuring reliability in automotive under-hood and cabin environments. Documentation is available in Taiwan Semiconductor's official AEC-Q101 report for the P6SMBx(A)H family.
What is the clamping voltage of the P6SMB18AH at its rated peak pulse current?
The P6SMB18AH has a maximum clamping voltage (VC) of 25.5 V at its rated peak pulse current (IPPM) of 25 A, measured under the standardized 10/1000 µs double-exponential surge waveform. This value represents the highest voltage imposed on the protected circuit during a full-rated transient event, directly determining whether downstream ICs remain within their absolute maximum ratings.
Can the P6SMB18AH be used in bidirectional applications?
No-the P6SMB18AH is unidirectional only. For bidirectional protection (e.g., AC-coupled data lines or differential buses), Taiwan Semiconductor offers the P6SMB18CAH variant, which uses a center-tapped dual-die configuration. Substituting P6SMB18AH in bidirectional roles risks failure during negative transients, as it lacks reverse avalanche capability. Always verify polarity alignment in schematic and layout for P6SMB18AH.
What is the thermal resistance and maximum junction temperature of the P6SMB18AH?
The P6SMB18AH has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W and a maximum junction temperature (TJ) of +150 °C. These values assume standard PCB mounting on 1 in² copper area. At 25 °C ambient, the device can dissipate up to 3 W continuously; however, in transient suppression mode, it handles 600 W for milliseconds without exceeding TJ due to short pulse duration and thermal inertia.
P6SMB18AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- P6SMB
- Packaging:
- Tape & Reel (TR)
- 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:
- 25.5V
- Current - Peak Pulse (10/1000µs):
- 25A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
P6SMB18AH FAQ
1.How can I place an order for P6SMB18AH through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB18AH 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 P6SMB18AH reliable?
The price and inventory of P6SMB18AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB18AH is usually 5 days.
3.What payment methods are accepted for P6SMB18AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB18AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB18AH?
P6SMB18AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB18AH 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 P6SMB18AH?
For technical support, including P6SMB18AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB18AH requirements.
6.How does Aetrix verify that P6SMB18AH is sourced from the original manufacturer or authorized distributors?
All P6SMB18AH 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 P6SMB18AH meets industry standards.
7.What is the process for return or replacement of P6SMB18AH?
All P6SMB18AH units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB18AH, 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 P6SMB18AH part is unused and in its original packaging.
Return procedure for P6SMB18AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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