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Taiwan Semiconductor Corporation P4SMA6.8AH
- Part No.:
- P4SMA6.8AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA6.8AH.pdf
- Description:
- 400W, 6.8V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,330
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Product details
Overview
P4SMA6.8AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-side overvoltage protection in DC power rails. It features a 6.46–7.14 V breakdown voltage (VBR), 5.80 V working stand-off voltage (VWM), 10.5 V clamping voltage (VC) at 40 A peak pulse current, 400 W peak pulse power rating (10/1000 µs), and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the P4SMA6.8AH datasheet, P4SMA6.8AH pinout, P4SMA6.8AH application, or P4SMA6.8AH equivalent, this device is selected for robust ESD and surge immunity in compact, high-reliability 12 V and 24 V automotive and industrial power systems where fast response (<1 ps), low leakage (<1 µA @ 5.8 V), and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance are required.
Technical Context
The P4SMA6.8AH operates as a unidirectional avalanche diode with glass-passivated junction, enabling stable clamping under repetitive transients. Its DO-214AC (SMA) package supports automated placement and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards.
It delivers 400 W peak pulse power handling per 10/1000 µs waveform at 25 °C, derating linearly above that ambient temperature. With a maximum reverse leakage of 1000 µA at VWM and clamping voltage of 10.5 V at 40 A, it ensures minimal voltage overshoot during load dump or inductive switching events in SMPS and DC/DC converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 10 mA | 6.46–7.14 V - Ensures reliable avalanche conduction onset within tight tolerance for consistent overvoltage triggering |
| VWM | 5.80 V - Maximum continuous reverse operating voltage; defines safe DC rail margin before leakage rises sharply |
| VC @ IPPM = 40 A | 10.5 V - Clamped voltage during 400 W surge; limits downstream IC stress to ≤10.5 V under worst-case transient |
| IR @ VWM | <1000 µA - Low standby leakage preserves battery life and avoids false trips in always-on circuits |
| PPPM | 400 W (10/1000 µs) - Sustains high-energy surges typical of ISO 7637-2 Pulse 1 and Pulse 2b without failure |
| TJ Range | −55 °C to +150 °C - Enables operation in under-hood automotive environments and industrial enclosures |
| Package | DO-214AC (SMA) - Standardized surface-mount footprint compatible with IPC-7351B land patterns and reflow profiles |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode band marking polarity, 0.060 g weight, and UL 94V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current path / low-impedance return during clamping | Connected to system ground or low-side reference; carries full surge current during transient suppression |
| Cathode (banded end) | Protected line connection / high-impedance input during normal operation | Connected to the rail being protected (e.g., 12 V supply); blocks reverse current until VBR exceeded |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS power domains |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives |
| Clamping response <1.0 ps | Prevents nanosecond-scale voltage spikes from reaching sensitive logic or analog circuitry |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Complies with full suite of automotive transient immunity test waveforms without external filtering |
| Moisture sensitivity level 1 (J-STD-020) | Zero bake requirement prior to reflow; supports standard SMT assembly without special handling |
Applications
| Switching Mode Power Supply (SMPS) | Automotive On-Board DC/DC Converter |
|---|---|
Use Scenario: Input-stage protection against load dump and back-EMF in 12 V/24 V offline SMPS designs. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and ground to clamp transients before they reach PWM controller and MOSFET gate drivers. Use Value: Limits peak voltage to 10.5 V during 400 W surges, preventing controller latch-up and MOSFET avalanche failure. | Use Scenario: Protection of 5 V/3.3 V point-of-load regulators fed from vehicle battery via buck converter. IC Role / Device Role / Timing Role: Primary-side TVS on the 12 V input rail upstream of the buck IC to absorb ISO 7637-2 Pulse 2b (inductive switch-off) energy. Use Value: Maintains regulator input below absolute maximum ratings during 100 V/50 ms pulses, avoiding brownout or shutdown. |
| Industrial Lighting Driver | USB-C Power Adapter Input Stage |
Use Scenario: Overvoltage safeguard in constant-current LED drivers exposed to field wiring transients. IC Role / Device Role / Timing Role: Standoff-rated TVS across bulk capacitor input to suppress line-to-ground surges induced by nearby motor starts or relay switching. Use Value: Clamps 40 A transients to ≤10.5 V, protecting driver ICs and enabling compliance with IEC 61000-4-5 Level 3 (2 kV) | Use Scenario: Secondary-side transient suppression on the 5–20 V USB PD output rail before connector interface. IC Role / Device Role / Timing Role: Unidirectional TVS connected between output VBUS and ground to prevent ESD and hot-swap overshoot from damaging port controllers. Use Value: Sub-1 ps response and 10.5 V clamping ensure USB PD PHY and MCU I/O remain within safe operating area during ±8 kV contact ESD. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ6.8A | Same VBR range (6.46–7.14 V), but 600 W PPPM, DO-214AA (SMB) package (larger footprint) | Higher power handling suits higher-energy industrial surges; requires PCB layout change due to larger pad spacing | Select SMBJ6.8A only if >400 W surge margin is required and board space allows DO-214AA footprint |
| 1.5SMC6.8A | Same VBR/VC specs, but 1500 W PPPM, DO-214AB (SMC) package (significantly larger, through-hole compatible) | Designed for legacy through-hole or high-reliability chassis-mounted use; not suitable for dense SMT layouts | Choose 1.5SMC6.8A only for retrofit or high-surge legacy systems where DO-214AC is unavailable or insufficient |
Compared with SMBJ6.8A and 1.5SMC6.8A, the P4SMA6.8AH offers optimal balance of AEC-Q101 qualification, compact DO-214AC footprint, and precise 400 W surge capability-making it ideal for space-constrained automotive and industrial SMT designs requiring certified reliability without over-engineering.
Availability
P4SMA6.8AH is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial LED drivers, and USB-C adapter input protection requiring stable component supply, AEC-Q101 compliance, and DO-214AC packaging.
Supply support for P4SMA6.8AH 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 automotive qualification capabilities.
The P4SMA6.8AH belongs to TSC's P4SMAx(A)H series-a family of AEC-Q101-qualified, surface-mount TVS diodes engineered specifically for ISO 7637-2-compliant transient suppression in automotive and harsh-environment industrial power systems.
FAQ
What is the polarity configuration of the P4SMA6.8AH?
The P4SMA6.8AH is a unidirectional TVS diode, marked with a cathode band on the DO-214AC package. It conducts only when the cathode is biased positive relative to the anode-making it suitable for DC rail protection where reverse voltage is not expected. This differs from bidirectional variants (e.g., P4SMA6.8AH with CH suffix), which suppress surges in both directions.
Does the P4SMA6.8AH meet automotive EMC requirements beyond AEC-Q101?
Yes-the P4SMA6.8AH is explicitly validated to meet ISO 7637-2 test pulses 1, 2a, 2b, 3a, and 3b, covering key automotive transient immunity requirements including load dump, supply interruption, and inductive switching. Its 10.5 V clamping voltage at 40 A ensures downstream components remain within safe operating limits during these standardized events.
What is the maximum allowable junction temperature for continuous operation of the P4SMA6.8AH?
The P4SMA6.8AH has a maximum junction temperature (TJ) rating of +150 °C, with operational range from −55 °C to +150 °C. Derating of peak pulse power begins above 25 °C ambient per Figure 2 in the datasheet; at 125 °C ambient, its 400 W rating reduces to approximately 200 W, ensuring thermal safety in under-hood or enclosed industrial environments.
How does the P4SMA6.8AH compare to the P4SMA6.8H variant?
The P4SMA6.8AH offers tighter breakdown voltage tolerance (6.46–7.14 V vs. 6.12–7.48 V for P4SMA6.8H) and lower clamping voltage (10.5 V vs. 10.8 V at 40 A), resulting in improved overvoltage margin for sensitive downstream ICs. Both share identical package, power rating, and AEC-Q101 qualification-but the "A" suffix denotes enhanced parametric consistency for critical applications.
Is the P4SMA6.8AH compatible with lead-free reflow soldering processes?
Yes-the P4SMA6.8AH uses matte tin-plated leads compliant with J-STD-002 and has a moisture sensitivity level (MSL) of 1 per J-STD-020, meaning it can be subjected to standard Pb-free reflow profiles (peak ~260 °C) without baking or special handling. Its UL 94V-0 molding compound also withstands repeated thermal cycling without delamination.
P4SMA6.8AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5.8V
- Voltage - Breakdown (Min):
- 6.46V
- Voltage - Clamping (Max) @ Ipp:
- 10.5V
- Current - Peak Pulse (10/1000µs):
- 40A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
P4SMA6.8AH FAQ
1.How can I place an order for P4SMA6.8AH through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA6.8AH 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 P4SMA6.8AH reliable?
The price and inventory of P4SMA6.8AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA6.8AH is usually 5 days.
3.What payment methods are accepted for P4SMA6.8AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA6.8AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA6.8AH?
P4SMA6.8AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA6.8AH 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 P4SMA6.8AH?
For technical support, including P4SMA6.8AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA6.8AH requirements.
6.How does Aetrix verify that P4SMA6.8AH is sourced from the original manufacturer or authorized distributors?
All P4SMA6.8AH 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 P4SMA6.8AH meets industry standards.
7.What is the process for return or replacement of P4SMA6.8AH?
All P4SMA6.8AH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA6.8AH, 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 P4SMA6.8AH part is unused and in its original packaging.
Return procedure for P4SMA6.8AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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