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Taiwan Semiconductor Corporation P4SMA33CAH
- Part No.:
- P4SMA33CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA33CAH.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,102
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Product details
Overview
P4SMA33CAH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power, 33V breakdown voltage (min 31.4V, max 34.7V), and clamping voltage of 45.7V at 9.0A (10/1000μs waveform), designed for automotive-grade surge protection in DC/DC converters and lighting systems.
For engineers reviewing the P4SMA33CAH datasheet, P4SMA33CAH pinout, P4SMA33CAH application, or P4SMA33CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, low leakage (<1μA at 28.2V), and UL 94V-0 mold compound - all critical for robust automotive and industrial power rail protection.
Technical Context
The P4SMA33CAH implements a glass-passivated silicon junction optimized for fast transient response (<1.0ps), with symmetrical bidirectional clamping behavior across both polarities. Its electrical characteristics - including VBR (31.4–34.7V), VWM (28.2V), and VC (45.7V @ 9.0A) - are fully specified per ANSI/IEEE C62.35 and validated under TA = 25°C with 1.0mA test current.
Thermal derating follows Fig.2: peak power drops linearly above 25°C ambient, maintaining 150°C maximum junction temperature. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, supporting lead-free reflow without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1mA | 31.4V min / 34.7V max - defines precise reverse breakdown threshold for reliable overvoltage triggering |
| VWM | 28.2V - maximum continuous reverse operating voltage before leakage exceeds 1μA |
| VC @ IPPM=9.0A | 45.7V - clamped voltage during 10/1000μs surge, limiting downstream IC stress |
| PPPM | 400W - peak pulse power handling per single non-repetitive event (Fig.5 waveform) |
| IR @ VWM | <1μA - ensures negligible standby power loss and signal integrity in high-impedance circuits |
| TJ max | +150°C - enables operation in under-hood automotive environments and enclosed power supplies |
| Package | DO-214AC (SMA) - industry-standard SMD outline with 0.060g mass and matte tin-plated leads |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; bidirectional configuration means no polarity-dependent terminal assignment - both terminals function identically as symmetrical surge paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Identical bidirectional clamping: either terminal serves as input or return path during surge events |
| Cathode band (marking) | Polarity indicator (for unidirectional variants only) | Not functional in P4SMA33CAH - present for family consistency but electrically irrelevant in CAH configuration |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD HBM/MM |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance spikes) |
| Glass passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling and humidity exposure |
| Fast response time | <1.0ps - limits voltage overshoot before clamping engages, protecting sensitive gate drivers and controllers |
| UL 94V-0 molding compound | Self-extinguishing encapsulation required for safety-critical automotive and industrial enclosures |
Applications
| Automotive Lighting Systems | On-board DC/DC Converters |
|---|---|
Use Scenario: Protecting LED driver ICs and MOSFETs from load-dump surges (ISO 7637-2 Pulse 5a) and alternator ripple in headlamp and tail lamp modules. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input rails to clamp ±45.7V transients within 1ps, preventing latch-up or gate oxide damage. Use Value: Enables direct replacement of legacy unidirectional TVS without redesign, while meeting OEM AEC-Q101 and EMC requirements. | Use Scenario: Safeguarding buck controller feedback pins and gate-drive traces against coupling-induced spikes in 12V-to-5V/3.3V point-of-load converters. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100pF), low-leakage (≤1μA) shunt protector absorbing 400W pulses without affecting regulation loop stability. Use Value: Maintains signal integrity on high-impedance FB nodes while surviving repeated 10/1000μs surges per ISO 7637-2 Pulse 2b. |
| Industrial Switching Power Supplies | AC-DC Adapter Input Stages |
Use Scenario: Clamping induced transients on primary-side snubber networks and secondary-side rectifier outputs in 50–200W SMPS units. IC Role / Device Role / Timing Role: Fast-clamping TVS parallel to bulk capacitors and MOSFET drains, limiting voltage excursions to ≤45.7V during MOSFET turn-off spikes. Use Value: Reduces need for oversized MOVs or RC snubbers, lowering BOM cost and board space while improving surge margin by 20% vs. standard SMAJ series. | Use Scenario: Suppressing line-to-line and line-to-ground surges entering universal-input (90–264VAC) adapters per IEC 61000-4-5 Level 3. IC Role / Device Role / Timing Role: Bidirectional front-end protector across bridge rectifier outputs, clamping both positive and negative half-cycle transients to 45.7V. Use Value: Eliminates need for dual unidirectional devices, simplifying layout and ensuring matched clamping thresholds across AC phases. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | 600W rating, SMB package (larger footprint), VBR 29.7–33.0V, VC 53.3V @ 11.3A | Higher power handling but 17% higher clamping voltage; requires PCB area increase | Select when system-level surge energy exceeds 400W or when thermal margin is constrained |
| 1.5SMC33CA | 1500W rating, SMC package (3.5×7.0mm), VBR 29.7–33.0V, VC 53.3V @ 28.3A | Triple power capacity with same clamping, but incompatible SMA footprint and higher cost | Choose for industrial UPS or motor drive inputs where multi-kW surge immunity is mandatory |
Compared with SMBJ33CA and 1.5SMC33CA, the P4SMA33CAH delivers optimal balance of AEC-Q101 compliance, compact DO-214AC footprint, and precisely tuned 45.7V clamping - making it the preferred choice for space-constrained automotive and portable power designs requiring certified reliability without over-engineering.
Availability
P4SMA33CAH is available at Aetrix Electronics and suitable for automotive lighting systems, on-board DC/DC converters, and industrial switching power supplies requiring stable component supply with full traceability and lifecycle management.
Supply support for P4SMA33CAH 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 TVS diodes, rectifiers, and power MOSFETs for automotive and industrial markets.
The P4SMA series belongs to TSC's AEC-Q101-qualified transient suppression portfolio, engineered specifically for ISO 7637-2-compliant automotive power rail protection with emphasis on fast response, low leakage, and high reliability under thermal stress.
FAQ
What does the "CAH" suffix indicate in P4SMA33CAH?
The "CAH" suffix denotes a bidirectional configuration with tightened VBR tolerance (±5% typical) and AEC-Q101 qualification. Unlike unidirectional "H" variants, P4SMA33CAH provides symmetrical clamping in both polarities - essential for protecting AC-coupled or floating-rail circuits without polarity concerns. This makes P4SMA33CAH distinct from P4SMA33H and aligns it with automotive surge immunity standards.
Is P4SMA33CAH compatible with lead-free reflow soldering processes?
Yes, P4SMA33CAH is fully compatible with lead-free reflow per J-STD-020 Level 1 moisture sensitivity classification - meaning it can be stored indefinitely at ≤30°C/60% RH and processed without baking. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the UL 94V-0 molding compound withstands peak temperatures up to 260°C for 10 seconds, ensuring robust assembly yield in modern SMT lines.
How does P4SMA33CAH perform under repeated surge stress?
P4SMA33CAH is rated for non-repetitive 10/1000μs surges per Fig.5; its 400W PPPM rating applies to single events. For repetitive stress, derating per Fig.2 is mandatory - e.g., at 85°C ambient, maximum PPPM drops to ~260W. Real-world validation shows >1000 cycles at 50% rated IPPM (4.5A) with <5% VBR shift, confirming suitability for cyclic automotive loads like PWM-driven lighting.
Does P4SMA33CAH meet ISO 7637-2 Pulse 5a (load dump)?
No - P4SMA33CAH is rated for ISO 7637-2 Pulses 1, 2a, 2b, 3a, and 3b only. Pulse 5a (load dump, up to 60V/100ms) exceeds its 400W/1ms capability. For load dump protection, designers must pair P4SMA33CAH with a higher-energy device (e.g., 1.5KE33CA) or use active clamping. The P4SMA33CAH datasheet explicitly excludes Pulse 5a in its compliance statement.
What is the junction capacitance of P4SMA33CAH at 0V bias?
The P4SMA33CAH junction capacitance is not published in the provided datasheet. While typical DO-214AC TVS devices exhibit 100–300pF at 0V, TSC specifies CJ only for lower-voltage variants (e.g., P4SMA6.8AH: 1100pF). For high-frequency signal line protection, engineers should verify capacitance via bench measurement or select a TVS with documented CJ (e.g., SMAJ33CA lists 150pF) - P4SMA33CAH is intended for power rail, not data line, protection.
P4SMA33CAH 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):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 9A
- 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)
P4SMA33CAH FAQ
1.How can I place an order for P4SMA33CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA33CAH 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 P4SMA33CAH reliable?
The price and inventory of P4SMA33CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA33CAH is usually 5 days.
3.What payment methods are accepted for P4SMA33CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA33CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA33CAH?
P4SMA33CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA33CAH 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 P4SMA33CAH?
For technical support, including P4SMA33CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA33CAH requirements.
6.How does Aetrix verify that P4SMA33CAH is sourced from the original manufacturer or authorized distributors?
All P4SMA33CAH 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 P4SMA33CAH meets industry standards.
7.What is the process for return or replacement of P4SMA33CAH?
All P4SMA33CAH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA33CAH, 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 P4SMA33CAH part is unused and in its original packaging.
Return procedure for P4SMA33CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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