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Taiwan Semiconductor Corporation P4SMA39CH
- Part No.:
- P4SMA39CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA39CH.pdf
- Description:
- 400W, 39V, 10%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:9,996
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Product details
Overview
P4SMA39CH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power, 35.1–42.9V breakdown voltage (VBR), and 56.4V clamping voltage (VC) at 7.4A peak impulse current. It protects DC/DC converters and automotive power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the P4SMA39CH datasheet, P4SMA39CH pinout, P4SMA39CH application, or P4SMA39CH equivalent, key selection criteria include its AEC-Q101 qualification, 1μA max reverse leakage at 31.6V working stand-off voltage, glass-passivated junction, and bidirectional-capable CH suffix variant compatibility with bipolar surge protection schemes.
Technical Context
The P4SMA39CH operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its 35.1–42.9V VBR range at 1mA test current. Its clamping action limits transient-induced voltage to ≤56.4V at 7.4A (10/1000μs waveform), enabling robust protection of 3.3V–24V downstream circuitry without latch-up or thermal runaway.
Designed for automotive-grade reliability, it features glass-passivated chip junction, JESD201 Class 2 whisker resistance, moisture sensitivity level 1 (J-STD-020), and compliance with ISO 7637-2 for vehicle electrical system immunity. Its fast response time (<1ps) ensures suppression before sensitive ICs experience overvoltage stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1mA | 35.1–42.9V: Ensures reliable turn-on above system operating voltage while avoiding false triggering during normal ripple. |
| VWM | 31.6V: Maximum continuous reverse operating voltage - sets safe margin below VBR for stable standby operation. |
| VC @ IPPM=7.4A | 56.4V: Clamped voltage during 10/1000μs surge - defines upper voltage limit imposed on protected circuitry. |
| IR @ VWM | ≤1μA: Ultra-low leakage preserves battery life and prevents signal path loading in low-power systems. |
| PPPM | 400W: Peak pulse power rating - supports high-energy transients per ISO 7637-2 without degradation. |
| TJ max | 150°C: Maximum junction temperature - enables operation in under-hood automotive environments. |
| Package | DO-214AC (SMA): Industry-standard SMD outline compatible with automated placement and reflow profiles. |
Pinout & Package
DO-214AC (SMA) package with cathode band marking; two-terminal unidirectional configuration. Matte tin-plated leads meet J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-side return path; forms current sink during transient clamp event. |
| Cathode | Protected line input | Connected to line being protected (e.g., 24V rail); reverse-biased during normal operation, avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics under temperature cycling, humidity, and mechanical shock stress. |
| Glass-passivated junction | Enhances long-term stability and reduces parameter drift across 150°C operating range and >1000-hour HTOL testing. |
| Fast response time <1ps | Clamps transients before propagation into downstream logic or analog circuitry - critical for CAN/LIN bus protection. |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Guarantees immunity to load dump, alternator ripple, and inductive switching events in 12V/24V vehicle architectures. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive - suitable for green manufacturing and export-controlled programs. |
Applications
| Automotive Power Rail Protection | On-Board DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 24V supply lines in ADAS camera modules against load-dump transients up to 35V. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed at DC/DC converter input to shunt surge energy to ground before regulation stage. Use Value: Limits clamped voltage to 56.4V, preventing damage to 40V-rated input MOSFETs and maintaining system uptime during cold-cranking events. | Use Scenario: Safeguarding isolated buck-boost converters powering infotainment head units from battery-side surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp at converter front-end, coordinated with upstream fuse and downstream EMI filter. Use Value: With 1μA leakage at 31.6V, avoids quiescent current penalty in always-on domains while delivering 400W transient handling. |
| Industrial SMPS Input Stage | LED Driver Power Input |
Use Scenario: Input protection for DIN-rail mounted 48V switch-mode power supplies used in factory automation PLCs. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after AC/DC rectification but before bulk capacitor to absorb line-induced spikes. Use Value: 31.6V VWM allows full utilization of 48V nominal input range while clamping 10/1000μs surges to 56.4V - preserving capacitor derating margin. | Use Scenario: Surge protection for constant-current LED drivers in streetlight systems exposed to lightning-induced grid transients. IC Role / Device Role / Timing Role: Bidirectional-capable variant (P4SMA39AH) used in AC-input designs; P4SMA39CH applied in DC-input configurations. Use Value: Glass-passivated junction ensures stable VBR over 50,000-hour lifetime under thermal cycling - critical for outdoor luminaires. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A | 600W rating, 36V VWM, DO-214AA (SMB) package - larger footprint and higher clamping (58.1V) | Better suited for higher-energy transients; less space-constrained layouts | Select SMBJ36A when board area permits and peak pulse power margin >400W is required. |
| P4SMA39A | Narrower VBR range (37.1–41.0V), same package and clamping (53.9V), tighter tolerance | Preferred where precise threshold matching is needed for multi-rail coordination | Choose P4SMA39A when VBR consistency across production lots is critical for fault detection algorithms. |
Compared with P4SMA39CH, SMBJ36A offers higher surge capacity but requires PCB redesign due to DO-214AA footprint, while P4SMA39A provides tighter breakdown control at identical mounting and thermal performance - making it ideal for precision rail monitoring.
Availability
P4SMA39CH is available at Aetrix Electronics and suitable for automotive power rail protection, on-board DC/DC converter input stages, and industrial SMPS input protection requiring stable component supply across extended temperature ranges and AEC-Q101-compliant sourcing.
Supply support for P4SMA39CH 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 distribution and AEC-Q101 validation capability.
The P4SMA series targets automotive and industrial transient suppression, designed specifically to meet ISO 7637-2 immunity requirements while supporting automated SMT assembly and long-term reliability in harsh environments.
FAQ
What is the maximum clamping voltage of the P4SMA39CH under standard 10/1000μs surge conditions?
The P4SMA39CH has a maximum clamping voltage (VC) of 56.4V at 7.4A peak impulse current using the 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry sees no more than 56.4V during standardized transient events - essential for safeguarding 40V-rated MOSFETs and regulators in automotive applications.
Is the P4SMA39CH suitable for bidirectional transient suppression?
No, the P4SMA39CH is unidirectional. For bidirectional use, select the P4SMA39AH variant (marked BXJ), which provides symmetrical clamping in both polarities and is explicitly designated for bipolar applications per TSC documentation. The "CH" suffix indicates cathode-band-marked unidirectional construction, not dual-direction capability.
Does the P4SMA39CH require derating at elevated ambient temperatures?
Yes, the P4SMA39CH must be derated above 25°C ambient per Figure 2 in the datasheet. At 85°C, its peak pulse power drops to approximately 240W (60% of 400W), and at 125°C, it falls to ~120W. Designers must apply this derating curve when deploying P4SMA39CH in under-hood or enclosed industrial enclosures where sustained high temperatures occur.
What is the reverse leakage current specification for the P4SMA39CH at its working stand-off voltage?
The P4SMA39CH exhibits a maximum reverse leakage current (IR) of 1μA at its rated working stand-off voltage (VWM) of 31.6V. This ultra-low leakage ensures minimal power loss in always-on automotive subsystems and avoids false triggering in high-impedance sensing circuits connected to the same rail.
How does the P4SMA39CH compare to the P4SMA39A in terms of breakdown voltage tolerance?
The P4SMA39CH has a VBR range of 35.1–42.9V (±11% typical), whereas the P4SMA39A (BXJ marking) tightens this to 37.1–41.0V (±5.3%). This narrower spread improves predictability in systems where precise clamping onset timing affects fault logging or redundancy arbitration - making P4SMA39A preferable for safety-critical diagnostics despite identical package and thermal specs.
P4SMA39CH 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 31.6V
- Voltage - Breakdown (Min):
- 35.1V
- Voltage - Clamping (Max) @ Ipp:
- 56.4V
- Current - Peak Pulse (10/1000µs):
- 7.4A
- 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)
P4SMA39CH FAQ
1.How can I place an order for P4SMA39CH through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA39CH 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 P4SMA39CH reliable?
The price and inventory of P4SMA39CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA39CH is usually 5 days.
3.What payment methods are accepted for P4SMA39CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA39CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA39CH?
P4SMA39CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA39CH 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 P4SMA39CH?
For technical support, including P4SMA39CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA39CH requirements.
6.How does Aetrix verify that P4SMA39CH is sourced from the original manufacturer or authorized distributors?
All P4SMA39CH 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 P4SMA39CH meets industry standards.
7.What is the process for return or replacement of P4SMA39CH?
All P4SMA39CH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA39CH, 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 P4SMA39CH part is unused and in its original packaging.
Return procedure for P4SMA39CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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