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Taiwan Semiconductor Corporation P6SMB18CAH
- Part No.:
- P6SMB18CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB18CAH.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
P6SMB18CAH from Taiwan Semiconductor is a bidirectional 600W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 17.1–18.9 V, clamping voltage 25.5 V at 25 A peak pulse current, and AEC-Q101 qualification for automotive-grade surge protection. It protects power rails and signal lines in automotive lighting and ECU interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the P6SMB18CAH datasheet, P6SMB18CAH pinout, P6SMB18CAH application, or P6SMB18CAH equivalent, key selection criteria include bidirectional clamping capability, 150°C junction rating, <1 μA leakage at 15.3 V standoff, 1.0 ps response time, and compliance with automotive ESD and fast-transient immunity standards.
Technical Context
P6SMB18CAH is a glass-passivated, bipolar TVS diode designed for unidirectional or bidirectional transient suppression without polarity sensitivity. Its symmetrical breakdown (VBR min/max = 17.1 V / 18.9 V) and matched clamping behavior in both directions enable robust protection of differential buses and AC-coupled circuits.
The device operates across –55°C to +150°C, features 10°C/W junction-to-case thermal resistance, and delivers 25.5 V clamping at 25 A (10/1000 μs waveform) with <1 μA reverse leakage at its 15.3 V stand-off voltage - meeting stringent requirements for under-hood automotive electronics and industrial control I/O protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V - Ensures reliable conduction onset within tight tolerance for precise overvoltage thresholding |
| VWM | 15.3 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA |
| VC @ IPPM | 25.5 V at 25 A - Clamped voltage during 10/1000 μs surge, limiting downstream IC stress |
| PPPSM | 600 W - Peak pulse power handling per single transient event, per ISO 7637-2 |
| TJ max | +150 °C - Enables placement near high-temperature components in engine control modules |
| Response time | <1.0 ps - Sub-nanosecond turn-on ensures protection before sensitive logic is damaged |
| AEC-Q101 | Qualified - Validated for automotive applications including temperature cycling, HTRB, and mechanical shock |
Pinout & Package
DO-214AA (SMB) surface-mount package: 4.57 mm × 3.94 mm × 2.29 mm body, matte tin-plated leads, cathode band marking for unidirectional variants; P6SMB18CAH is bidirectional and marked with "LEJ" code - no polarity marking required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | Either terminal serves as anode or cathode - enables placement without orientation constraints on PCB |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including temperature cycling, HTRB, and mechanical shock testing |
| Glass passivated junction | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (ESD coupling) |
| Moisture sensitivity level 1 | No floor life limitation or baking required prior to reflow - supports standard SMT assembly |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Lighting Systems | Engine Control Unit (ECU) I/O Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and CAN transceivers in headlamp modules exposed to load-dump transients up to 35 V. IC Role / Device Role: Bidirectional clamping element placed at connector interface to shunt surge energy before it reaches downstream regulators and microcontrollers. Use Value: Limits voltage to ≤25.5 V during 25 A transients, preventing latch-up or gate oxide damage in 3.3 V/5 V logic interfaces. | Use Scenario: Safeguarding analog sensor inputs (e.g., MAP, TPS) and digital outputs (fuel injector drivers) in engine management systems. IC Role / Device Role: Primary transient suppressor on 12 V supply rail and signal lines subject to ISO 7637-2 Pulse 1 and Pulse 2a events. Use Value: Maintains system uptime by absorbing 600 W surges without degradation, verified over 1,000+ cycles at 150°C ambient. |
| Industrial Motor Drive Gate Drivers | Smart Building HVAC Communication Lines |
Use Scenario: Shielding isolated gate drivers (e.g., SiC MOSFET drivers) from inductive kickback during IGBT/SiC switching in variable-frequency drives. IC Role / Device Role: Low-capacitance TVS placed across gate-source terminals to clamp Miller-induced spikes without affecting switching speed. Use Value: Junction capacitance <100 pF at 0 V enables minimal signal distortion while providing 25.5 V clamping at 25 A. | Use Scenario: Protecting RS-485 transceivers and microcontroller UART lines in HVAC controllers subjected to EFT bursts per IEC 61000-4-4. IC Role / Device Role: Bidirectional line protector on differential bus pairs, leveraging symmetrical VBR to handle polarity-reversal transients. Use Value: Delivers consistent 25.5 V clamping regardless of transient polarity - critical for full-duplex communication integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | 400 W peak power, same DO-214AC (SMA) package, VBR = 20.0–22.2 V, VC = 29.2 V @ 13.7 A | Lower power rating and higher clamping voltage limit suitability to lower-energy transients only | Select when board space allows SMA footprint and system surge energy is ≤400 W |
| 1.5KE18CA | 1500 W peak power, axial DO-15 package, VBR = 17.1–18.9 V, VC = 27.7 V @ 54.3 A | Through-hole mounting and larger form factor preclude automated SMT assembly | Choose for legacy designs requiring higher surge margin and manual assembly compatibility |
Compared with SMAJ18CA and 1.5KE18CA, P6SMB18CAH offers optimal balance of 600 W surge capacity, SMB footprint for high-density automotive PCBs, and AEC-Q101 qualification - making it the preferred choice for new SMT-based automotive and industrial designs requiring validated reliability.
Availability
P6SMB18CAH is available at Aetrix Electronics and suitable for automotive lighting systems, engine control unit (ECU) protection, and industrial motor drive gate driver circuits requiring stable component supply, AEC-Q101 compliance, and surface-mount manufacturability.
Supply support for P6SMB18CAH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101-qualified product lines.
The P6SMB series was developed specifically for automotive and industrial transient suppression, targeting ISO 7637-2 compliance, high-temperature operation, and automated SMT assembly in space-constrained environments.
FAQ
What is the exact breakdown voltage range for P6SMB18CAH?
The P6SMB18CAH has a guaranteed breakdown voltage range of 17.1 V to 18.9 V at 1.0 mA test current, measured per ANSI/IEEE C62.35. This tight 10% tolerance ensures predictable turn-on behavior in automotive power rail protection circuits where precise clamping thresholds are critical for system-level robustness.
Is P6SMB18CAH unidirectional or bidirectional?
P6SMB18CAH is a bidirectional TVS diode, indicated by the "CAH" suffix. Its symmetrical avalanche structure provides identical electrical characteristics in both polarities - enabling use on AC lines, differential buses, or polarity-agnostic PCB layouts without orientation concerns during placement.
Does P6SMB18CAH meet automotive qualification standards?
Yes, P6SMB18CAH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. It is rated for operation from –55°C to +150°C and has passed humidity, temperature cycling, and high-temperature reverse bias (HTRB) tests mandated for under-hood automotive electronics.
What is the maximum clamping voltage of P6SMB18CAH under surge conditions?
The maximum clamping voltage of P6SMB18CAH is 25.5 V at 25 A peak pulse current (10/1000 μs waveform). This value defines the upper voltage limit imposed on protected circuitry during worst-case transients, ensuring safe operation of 3.3 V, 5 V, and 12 V ICs downstream of the device.
Can P6SMB18CAH be used in place of unidirectional P6SMB18AH?
No - P6SMB18CAH and P6SMB18AH are electrically distinct: the "CAH" variant is bidirectional with symmetrical VBR, while "AH" is unidirectional with cathode marking. Substituting one for the other may cause incorrect clamping behavior or failure to protect reverse-polarity transients; always match suffix per design intent.
P6SMB18CAH 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:
- -
- Bidirectional Channels:
- 1
- 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)
P6SMB18CAH FAQ
1.How can I place an order for P6SMB18CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB18CAH 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 P6SMB18CAH reliable?
The price and inventory of P6SMB18CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB18CAH is usually 5 days.
3.What payment methods are accepted for P6SMB18CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB18CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB18CAH?
P6SMB18CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB18CAH 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 P6SMB18CAH?
For technical support, including P6SMB18CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB18CAH requirements.
6.How does Aetrix verify that P6SMB18CAH is sourced from the original manufacturer or authorized distributors?
All P6SMB18CAH 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 P6SMB18CAH meets industry standards.
7.What is the process for return or replacement of P6SMB18CAH?
All P6SMB18CAH units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB18CAH, 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 P6SMB18CAH part is unused and in its original packaging.
Return procedure for P6SMB18CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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