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Taiwan Semiconductor Corporation P4SMA68AH
- Part No.:
- P4SMA68AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA68AH.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,286
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Product details
Overview
P4SMA68AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power, 64.6–71.4V breakdown voltage (VBR), and 92.0V maximum clamping voltage (VC) at 4.5A IPPM under 10/1000μs waveform. It delivers fast response (<1.0ps), low leakage (<1μA at 58.1V), and AEC-Q101 qualification for automotive-grade surge protection in DC/DC converters and SMPS inputs.
For engineers reviewing the P4SMA68AH datasheet, P4SMA68AH pinout, P4SMA68AH application, or P4SMA68AH equivalent, key selection criteria include its unidirectional polarity, 58.1V working stand-off voltage (VWM), 150°C max junction temperature, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and DO-214AC mechanical compatibility with automated SMT placement.
Technical Context
The P4SMA68AH operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve stable breakdown behavior and low leakage. Its clamping action begins at VBR ≥64.6V and limits transient energy to ≤92.0V at 4.5A, enabling robust protection of downstream 60V-class power rails.
Designed for single-die configuration in DO-214AC, it supports bidirectional variants via CH/CAH suffixes but P4SMA68AH itself is strictly unidirectional - cathode band marked on package defines polarity. Thermal derating follows Fig.2, maintaining 400W capability only at TA = 25°C, with linear reduction above that ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1mA | 64.6–71.4V - ensures reliable avalanche initiation above system nominal voltage while avoiding false triggering |
| VWM | 58.1V - maximum continuous reverse voltage before leakage exceeds 1μA; sets upper limit for protected circuit operating voltage |
| VC @ IPPM=4.5A | 92.0V - clamped voltage during 10/1000μs surge; must remain below downstream component absolute maximum ratings |
| PPPM | 400W - peak pulse power handling per single non-repetitive event; defines surge energy absorption capacity |
| IPPM | 4.5A - peak impulse current at VC; used with PCB trace impedance to estimate let-through energy |
| TJMAX | 150°C - maximum junction temperature; determines thermal design margin for high-ambient automotive or industrial environments |
| Response time | <1.0ps - enables suppression of ESD and fast transients before sensitive ICs experience overstress |
Pinout & Package
DO-214AC (SMA) surface-mount package: molded epoxy case meeting UL 94V-0, matte tin-plated leads, 0.060g weight, polarity indicated by cathode band. Compliant with JESD201 Class 2 whisker resistance and J-STD-020 moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side for transient energy | Connected to line/rail requiring protection; conducts during forward surge (e.g., IFSM=40A) |
| Cathode | Clamping reference node | Connected to ground or return path; defines unidirectional conduction direction and clamping threshold |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal and humidity stress |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line capacitance discharge) |
| Fast response <1.0ps | Suppresses nanosecond-scale ESD events before propagation into microcontrollers or gate drivers |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Input stage of 48V telecom or industrial SMPS subjected to load dump and coupling transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input terminals to clamp surges before primary-side controller and MOSFETs. Use Value: Limits let-through voltage to ≤92.0V during 400W transients, protecting 100V-rated input capacitors and controllers without derating. | Use Scenario: 12V-to-3.3V buck converter in automotive body control module exposed to battery line transients. IC Role / Device Role / Timing Role: Primary overvoltage protector on VIN rail, coordinated with upstream fuse and downstream L-C filtering. Use Value: Clamps ISO 7637-2 Pulse 1 (−100V/10Ω) to safe levels within 1ps, preventing latch-up in synchronous rectifier drivers. |
| Lighting Application | Adapters |
Use Scenario: LED driver input in outdoor streetlight with long cable runs susceptible to lightning-induced surges. IC Role / Device Role / Timing Role: First-line transient suppressor before bridge rectifier and PFC stage. Use Value: Absorbs 400W pulses without degradation, maintaining VWM = 58.1V to avoid leakage-induced thermal drift in high-temperature enclosures. | Use Scenario: AC-DC adapter secondary-side output rail where low-profile mounting is required. IC Role / Device Role / Timing Role: Output-side TVS safeguarding USB-PD or constant-current LED loads against backfeed transients. Use Value: DO-214AC footprint enables compact layout; 0.060g mass supports lightweight portable adapter designs without compromising surge rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64A | DO-214AA (SMB) package; 64V VWM, 103V VC @ 3.9A; same 400W rating but higher clamping voltage | Larger footprint than DO-214AC; lower current density due to larger junction area | Select when board space allows SMB and higher clamping margin is acceptable |
| 1.5SMC68A | DO-214AB (SMC) package; 68V VWM, 110V VC @ 3.6A; 1500W rating but physically larger | Not drop-in: requires PCB redesign; suited for higher-energy systems like industrial motor drives | Choose only if surge energy exceeds 400W and layout permits SMC footprint |
Compared with SMBJ64A and 1.5SMC68A, the P4SMA68AH offers tighter VC (92.0V vs. 103V/110V) and smallest form factor (DO-214AC), making it optimal for space-constrained automotive and portable power applications where precise clamping and SMT automation are critical.
Availability
P4SMA68AH is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply with AEC-Q101 qualification and ISO 7637-2 compliance.
Supply support for P4SMA68AH 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 power management, protection, and signal conditioning devices.
The P4SMA68AH belongs to TSC's P4SMAx(A)H series of surface-mount TVS diodes, engineered specifically for automotive and industrial DC power rail protection with emphasis on AEC-Q101 reliability, automated assembly compatibility, and standardized ISO 7637-2 surge immunity.
FAQ
Is P4SMA68AH unidirectional or bidirectional?
The P4SMA68AH is a unidirectional TVS diode, as confirmed by its part number suffix "H" (not "AH" for bidirectional variants) and explicit marking of cathode band on the DO-214AC package. Its electrical characteristics apply only in reverse-biased mode - forward conduction occurs above 3.5V with 40A surge capability, but clamping is specified only for reverse transients. This makes P4SMA68AH suitable for DC rail protection where polarity is fixed.
What is the maximum clamping voltage of P4SMA68AH and how is it measured?
The maximum clamping voltage of P4SMA68AH is 92.0V, measured at IPPM = 4.5A under the standardized 10/1000μs double-exponential surge waveform per ANSI/IEEE C62.35. This value represents the peak voltage across the device during worst-case transient suppression and must be compared directly against the absolute maximum voltage rating of downstream components to ensure safe operation.
Does P4SMA68AH meet automotive qualification standards?
Yes, P4SMA68AH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for automotive electrical systems. Its glass-passivated junction, JESD201 Class 2 whisker resistance, and moisture sensitivity level 1 rating further support use in engine control units, body electronics, and ADAS modules where long-term reliability under thermal cycling and humidity is mandatory.
Can P4SMA68AH be used in bidirectional signal lines?
No, P4SMA68AH is not suitable for bidirectional signal line protection because it is a unidirectional device. For AC or bidirectional data/power lines, TSC specifies variants with "CH" or "CAH" suffixes (e.g., P4SMA68CH). Using P4SMA68AH in such configurations would result in forward conduction during half-cycles, causing malfunction or damage. Always verify polarity alignment in schematic and layout for P4SMA68AH.
What is the working stand-off voltage (VWM) of P4SMA68AH and why does it matter?
The working stand-off voltage (VWM) of P4SMA68AH is 58.1V - the maximum DC or continuous reverse voltage the device can withstand without exceeding 1μA leakage current. This parameter is critical for ensuring the TVS remains inactive during normal operation while still providing margin below VBR (64.6–71.4V); selecting a VWM too close to system voltage risks premature conduction and thermal runaway.
P4SMA68AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 58.1V
- Voltage - Breakdown (Min):
- 64.6V
- Voltage - Clamping (Max) @ Ipp:
- 92V
- Current - Peak Pulse (10/1000µs):
- 4.5A
- 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)
P4SMA68AH FAQ
1.How can I place an order for P4SMA68AH through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA68AH 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 P4SMA68AH reliable?
The price and inventory of P4SMA68AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA68AH is usually 5 days.
3.What payment methods are accepted for P4SMA68AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA68AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA68AH?
P4SMA68AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA68AH 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 P4SMA68AH?
For technical support, including P4SMA68AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA68AH requirements.
6.How does Aetrix verify that P4SMA68AH is sourced from the original manufacturer or authorized distributors?
All P4SMA68AH 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 P4SMA68AH meets industry standards.
7.What is the process for return or replacement of P4SMA68AH?
All P4SMA68AH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA68AH, 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 P4SMA68AH part is unused and in its original packaging.
Return procedure for P4SMA68AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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