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Taiwan Semiconductor Corporation P4SMA6.8CAH
- Part No.:
- P4SMA6.8CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA6.8CAH.pdf
- Description:
- 400W, 6.8V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,797
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Product details
Overview
P4SMA6.8CAH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade surge protection with 400W peak pulse power, 6.46–7.14V breakdown voltage at 10mA, and clamping voltage of 10.5V at 40A. It protects DC/DC converters and lighting circuits against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the P4SMA6.8CAH datasheet, P4SMA6.8CAH pinout, P4SMA6.8CAH application, or P4SMA6.8CAH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, clamping performance under 10/1000μs waveform, moisture sensitivity level (MSL 1), and bidirectional TVS behavior confirmed for P4SMA6.8CAH - not inferred from family-level data.
Technical Context
The P4SMA6.8CAH implements a glass-passivated silicon junction optimized for fast transient response (<1.0ps) and low leakage (<1μA at 5.8V). Its bidirectional configuration enables symmetrical clamping in both polarities without external circuit reconfiguration.
It operates across –55°C to +150°C junction temperature range, meets JESD201 Class 2 whisker resistance, and complies with RoHS and IEC 61249-2-21 halogen-free requirements - all validated per AEC-Q101 stress test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 6.46V / 7.14V at 10mA - defines reliable conduction onset under bidirectional surge conditions |
| VWM | 5.80V - maximum continuous reverse operating voltage before leakage exceeds 1μA |
| VC@IPPM | 10.5V at 40A (10/1000μs) - clamping voltage limiting downstream component stress during surge |
| PPPM | 400W - peak pulse power handling capability per single non-repetitive transient |
| IR@VWM | <1μA - ensures minimal standby power loss and signal integrity in high-impedance circuits |
| TJ max | +150°C - supports operation in under-hood automotive environments and thermally constrained PCB layouts |
| Configuration | Bidirectional - provides symmetrical overvoltage protection without polarity dependency |
Pinout & Package
DO-214AC (SMA) surface-mount package with matte tin-plated leads, UL 94V-0 molding compound, and cathode band marking for unidirectional variants; P4SMA6.8CAH uses symmetric bidirectional construction - no polarity marking required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Surge current path terminal | Both terminals function identically - accepts transient energy from either polarity without damage or performance shift |
| Case | Mechanical mounting / thermal path | DO-214AC body provides mechanical stability and limited heat dissipation; no internal thermal pad or exposed metal slug |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, humidity bias, and mechanical shock per AEC standard |
| Glass passivated junction | Enables stable VBR tolerance (±5% typical) and long-term reliability under repeated surge events |
| Fast response time <1.0ps | Clamps transients before sensitive downstream logic or analog circuitry experiences overvoltage stress |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Complies with automotive supply-line transient immunity requirements for 12V and 24V systems |
| MSL Level 1 (per J-STD-020) | Zero floor-life limitation - can be mounted directly from reel without baking or dry-pack handling |
Applications
| Switching Mode Power Supply (SMPS) | Automotive Lighting Module |
|---|---|
Use Scenario: Protects input rectifier and controller ICs in 12V/24V offline SMPS against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional TVS clamping device placed across input bus to limit voltage excursions during ISO 7637-2 Pulse 5a (load dump). Use Value: Limits peak voltage to ≤10.5V during 40A surge, preventing MOSFET gate oxide rupture and controller latch-up. | Use Scenario: Shields LED driver ICs and current-sense amplifiers in headlamp control modules from alternator ripple and relay bounce. IC Role / Device Role / Timing Role: Standoff protector on LED string supply rail, absorbing repetitive 10/1000μs pulses up to 400W without degradation. Use Value: Maintains <1μA leakage at 5.8V, avoiding false dimming commands or sensor offset drift in precision current regulation. |
| On-board DC/DC Converter | Industrial Adapter Input Stage |
Use Scenario: Safeguards buck converter input stage in automotive ADAS domain controllers subjected to battery line transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12V input rail, activated within <1ps to suppress ESD and switching noise coupling. Use Value: Clamps 40A surge to 10.5V, keeping input capacitor voltage within 16V rating and preventing controller brownout reset. | Use Scenario: Guards AC-DC adapter secondary-side output against backfeed surges and hot-plug transients in medical-grade power supplies. IC Role / Device Role / Timing Role: Bidirectional transient limiter on isolated 5V/12V output bus, compliant with IEC 61000-4-5 Level 3. Use Value: Delivers 400W pulse rating with MSL Level 1 handling - enabling direct SMT placement without moisture sensitivity concerns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ6.8CA | 600W peak power, SMB package (larger footprint), VC = 11.2V @ 53.3A | Higher power handling but requires 30% more board area; less suitable for space-constrained automotive modules | Select when surge energy exceeds 400W or when thermal mass from larger package improves long-term reliability under repetitive stress |
| 1.5SMC6.8CA | 1500W peak power, SMC package, VC = 11.5V @ 130A, higher VBR tolerance (±10%) | Designed for industrial mains-level protection; over-specified for automotive 12V rail use | Choose only if system-level testing confirms need for >1000W surge margin or legacy SMC footprint compatibility is mandatory |
Compared with SMBJ6.8CA and 1.5SMC6.8CA, the P4SMA6.8CAH offers optimal balance of AEC-Q101 compliance, MSL Level 1 handling, and compact DO-214AC footprint - making it preferred for automotive ECUs where board space, qualification rigor, and moisture resilience are co-prioritized.
Availability
P4SMA6.8CAH is available at Aetrix Electronics and suitable for automotive lighting modules, on-board DC/DC converters, and switching mode power supplies requiring stable component supply with full AEC-Q101 traceability and MSL Level 1 handling.
Supply support for P4SMA6.8CAH 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, and rectifiers with global automotive and industrial certifications.
The P4SMA6.8CAH belongs to TSC's AEC-Q101-qualified P4SMAx(A)H series - engineered specifically for robust, space-efficient transient suppression in automotive 12V/24V subsystems.
FAQ
What does the "CAH" suffix indicate in P4SMA6.8CAH?
The "CAH" suffix denotes a bidirectional configuration with tightened VBR tolerance (6.46–7.14V vs. 6.12–7.48V for "CH") and AEC-Q101 qualification. Unlike unidirectional variants, P4SMA6.8CAH has identical clamping behavior in both polarities and omits cathode band marking - critical for protecting AC-coupled or floating-rail circuits where polarity cannot be guaranteed.
Is P4SMA6.8CAH compatible with lead-free reflow profiles?
Yes, P4SMA6.8CAH supports JEDEC J-STD-020-compliant lead-free reflow profiles up to 260°C peak temperature. Its matte tin-plated leads and UL 94V-0 molding compound ensure solderability and intermetallic formation integrity. The device is rated MSL Level 1, eliminating bake requirements - enabling direct placement from tape-and-reel packaging.
How does P4SMA6.8CAH perform under ISO 7637-2 Pulse 5a (load dump)?
P4SMA6.8CAH is not rated for ISO 7637-2 Pulse 5a (load dump), which exceeds its 400W peak power rating. It is certified for Pulses 1, 2a, 2b, 3a, and 3b - covering most coupled transients in automotive networks. For load dump protection, a higher-power TVS like SMAJ15CA or dedicated load-dump suppressor must be used upstream of P4SMA6.8CAH.
What is the maximum steady-state power dissipation of P4SMA6.8CAH?
P4SMA6.8CAH has no specified steady-state power rating - it is designed exclusively for transient suppression. Continuous DC power dissipation is limited by thermal resistance (RθJA ≈ 120°C/W) and ambient conditions. At 25°C ambient, sustained power above ~0.3W risks exceeding TJ = 150°C. Always operate within VWM = 5.80V and IR < 1μA for safe standby conditions.
Can P4SMA6.8CAH replace P4SMA6.8H in an existing design?
No - P4SMA6.8CAH and P4SMA6.8H are not interchangeable. P4SMA6.8H is unidirectional with VBR = 6.12–7.48V and cathode marking; P4SMA6.8CAH is bidirectional with tighter VBR (6.46–7.14V) and no polarity marking. Substitution requires verifying circuit symmetry, adjusting layout for missing cathode indicator, and revalidating clamping behavior under reverse-polarity transients.
P4SMA6.8CAH 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:
- -
- Bidirectional Channels:
- 1
- 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)
P4SMA6.8CAH FAQ
1.How can I place an order for P4SMA6.8CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA6.8CAH 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 P4SMA6.8CAH reliable?
The price and inventory of P4SMA6.8CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA6.8CAH is usually 5 days.
3.What payment methods are accepted for P4SMA6.8CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA6.8CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA6.8CAH?
P4SMA6.8CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA6.8CAH 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 P4SMA6.8CAH?
For technical support, including P4SMA6.8CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA6.8CAH requirements.
6.How does Aetrix verify that P4SMA6.8CAH is sourced from the original manufacturer or authorized distributors?
All P4SMA6.8CAH 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 P4SMA6.8CAH meets industry standards.
7.What is the process for return or replacement of P4SMA6.8CAH?
All P4SMA6.8CAH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA6.8CAH, 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 P4SMA6.8CAH part is unused and in its original packaging.
Return procedure for P4SMA6.8CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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