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Vishay General Semiconductor - Diodes Division P4SMA20CAHE3/5A
- Part No.:
- P4SMA20CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA20CAHE3/5A.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,703
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Product details
Overview
P4SMA20CAHE3/5A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in the P4SMA series, designed for clamping voltage transients on signal and power lines. It features a 20 V standoff voltage (VWM), 22.8–25.2 V breakdown voltage (VBR) at 1 mA, 27.7 V maximum clamping voltage (VC) at 14.4 A peak pulse current, and 400 W peak pulse power capability with a 10/1000 µs waveform - suitable for protecting MOSFETs, ICs, and sensor signal lines in automotive and industrial control systems.
For engineers reviewing the P4SMA20CAHE3/5A datasheet, P4SMA20CAHE3/5A pinout, P4SMA20CAHE3/5A application, or P4SMA20CAHE3/5A equivalent, key selection criteria include bidirectional clamping performance, AEC-Q101 qualification, SMA (DO-214AC) package compatibility, and thermal derating behavior above 25 °C ambient.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at VWM), while the low incremental surge resistance supports fast transient suppression with minimal voltage overshoot.
The device is rated for 150 °C maximum junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow peak. Its 120 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design (0.2" × 0.2") to sustain repetitive 400 W pulses at ≤0.01% duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating range for protected circuitry. |
| VBR (Breakdown Voltage) | 22.8–25.2 V at 1 mA - Confirmed breakdown threshold where device transitions into avalanche conduction; tight tolerance enables predictable protection onset. |
| VC (Clamping Voltage) | 27.7 V at 14.4 A IPPM - Peak voltage seen across protected line during 10/1000 µs transient; directly limits stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capability under standard 10/1000 µs waveform; critical for inductive switch-off and ESD event handling. |
| ID (Reverse Leakage) | <1 µA at 20 V - Minimal DC loading on signal lines; preserves signal integrity and reduces standby power loss. |
| TJ max. | 150 °C - Maximum allowable junction temperature; sets upper limit for thermal design margin in high-ambient environments. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing; required for under-hood and ADAS applications. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common node in bidirectional operation | Connected to line being protected; symmetrical with cathode for AC or differential transient suppression. |
| Cathode | Current exit terminal in forward bias; common node in bidirectional operation | Connected to line being protected; functionally identical to anode in bidirectional mode - no polarity dependency. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, RS-485 buses, and transformer-coupled interfaces without external polarity management. |
| 400 W peak pulse power (10/1000 µs) | Supports robust immunity against IEC 61000-4-5 Level 3 surges (1 kV/42 Ω) and ISO 7637-2 Pulse 1/2a/3a in automotive ECUs. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body electronics, and infotainment modules requiring extended lifetime and thermal cycling endurance. |
| Low profile SMA package | 0.208" length × 0.157" width footprint enables high-density layout on compact PCBs while maintaining 0.110" standoff height for thermal relief. |
| Glass passivated junction | Ensures stable VBR over time and temperature, low leakage drift, and resistance to humidity-induced parameter shift in harsh environments. |
Applications
| Automotive Sensor Signal Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines (e.g., 0–5 V throttle position sensor) from load dump and alternator ripple in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and ground to clamp transients before reaching ADC input or op-amp buffer. Use Value: Limits voltage excursion to ≤27.7 V during 100 V/50 ms load dump events, preventing ADC saturation and preserving measurement accuracy. |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from inductive kickback when solenoids de-energize. IC Role / Device Role / Timing Role: Fast-response shunt device absorbing 400 W surge energy within nanoseconds to prevent false triggering of optocoupler inputs. Use Value: Clamps 24 V line to 27.7 V within <1 ns, ensuring reliable state detection and eliminating spurious interrupts in real-time control loops. |
| RS-485 Bus Transient Suppression | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding half-duplex RS-485 transceivers (e.g., MAX485) against ESD and lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Bidirectional TVS connected across differential pair (A–B) and to ground to suppress common-mode and differential-mode transients. Use Value: Maintains signal integrity by limiting differential voltage swing to <55.4 V (2 × VC), preventing transceiver latch-up during ±8 kV contact ESD per IEC 61000-4-2. |
Use Scenario: Protecting microcontroller GPIO pins driving small brushed DC motors in smart home appliances (e.g., vacuum cleaners, fans). IC Role / Device Role / Timing Role: Low-capacitance TVS placed at motor driver output to absorb back-EMF spikes generated during PWM commutation. Use Value: Prevents MCU reset or I/O damage by clamping 60 V inductive spikes to 27.7 V with sub-1 ns response, enabling reliable 20 kHz PWM operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA | Same VWM (20 V) and bidirectional structure, but SMB package (DO-214AA) - 20 % larger footprint and 10 % higher RθJA (135 °C/W). | Less suitable for ultra-high-density layouts; lower power density limits sustained pulse handling in confined thermal zones. | Select when existing PCB land pattern matches SMB and AEC-Q101 qualification is not required. |
| 1.5KE20CA | Through-hole TO-204AA (DO-41) package; same electrical specs but 1.5 kW peak power rating and 5x higher thermal mass. | Not suitable for automated SMT assembly; used in legacy designs or high-energy surge applications where board space permits. | Choose only for through-hole prototyping or retrofitting older equipment where rework constraints prohibit SMT adoption. |
Compared with SMBJ20CA and 1.5KE20CA, the P4SMA20CAHE3/5A delivers AEC-Q101 compliance, optimal SMT manufacturability in the compact SMA outline, and verified 400 W pulse capability - making it the preferred choice for new automotive and industrial designs requiring high-reliability, space-constrained transient protection.
Availability
P4SMA20CAHE3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, RS-485 communication ports, and consumer appliance motor control circuits requiring stable component supply and full traceability.
Supply support for P4SMA20CAHE3/5A 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, precision, and automotive-grade validation.
The P4SMA series was developed specifically for surface-mount transient suppression in space-constrained, high-reliability applications - combining AEC-Q101 qualification, low-profile packaging, and tightly controlled clamping parameters for automotive and industrial markets.
FAQ
What is the clamping voltage of P4SMA20CAHE3/5A at its rated peak pulse current?
The P4SMA20CAHE3/5A has a maximum clamping voltage (VC) of 27.7 V at 14.4 A peak pulse current (IPPM), measured under the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events. The P4SMA20CAHE3/5A maintains this clamping performance consistently due to its glass-passivated junction and low incremental surge resistance.
Is P4SMA20CAHE3/5A qualified for automotive applications?
Yes, P4SMA20CAHE3/5A is AEC-Q101 qualified, as indicated by the "HE3" suffix in its ordering code. This certification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD robustness - validating its use in automotive powertrain, body control, and ADAS modules. The P4SMA20CAHE3/5A meets all requirements for under-hood and cabin-mounted electronics operating up to 150 °C junction temperature.
What does the "CA" suffix mean in P4SMA20CAHE3/5A?
The "CA" suffix in P4SMA20CAHE3/5A denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression in both polarities - essential for protecting AC-coupled signals, differential buses (e.g., RS-485), and transformer-isolated interfaces. Unlike unidirectional variants (e.g., P4SMA20A), the P4SMA20CAHE3/5A has no cathode marking and functions identically regardless of voltage polarity applied across its terminals.
What is the thermal resistance of P4SMA20CAHE3/5A, and how does it affect layout?
The P4SMA20CAHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads per terminal. This value implies that sustained 400 W pulses require strict adherence to the specified pad layout to avoid exceeding the 150 °C maximum junction temperature. Reducing pad size or omitting thermal vias increases RθJA and risks thermal runaway during repetitive surges - a critical consideration in the P4SMA20CAHE3/5A layout.
How does P4SMA20CAHE3/5A compare to P4SMA20A in terms of functionality?
The P4SMA20CAHE3/5A is bidirectional, while P4SMA20A is unidirectional - meaning the P4SMA20CAHE3/5A clamps transients equally in both directions and has no polarity marking, whereas P4SMA20A requires correct cathode orientation and only protects against reverse-polarity surges. Both share identical VWM (20 V), VBR (22.8–25.2 V), and PPPM (400 W), but the P4SMA20CAHE3/5A is mandatory for AC signal paths and differential interfaces where polarity reversal occurs.
P4SMA20CAHE3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 14.4A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA20CAHE3/5A FAQ
1.How can I place an order for P4SMA20CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA20CAHE3/5A 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 P4SMA20CAHE3/5A reliable?
The price and inventory of P4SMA20CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA20CAHE3/5A is usually 5 days.
3.What payment methods are accepted for P4SMA20CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA20CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA20CAHE3/5A?
P4SMA20CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA20CAHE3/5A 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 P4SMA20CAHE3/5A?
For technical support, including P4SMA20CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA20CAHE3/5A requirements.
6.How does Aetrix verify that P4SMA20CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All P4SMA20CAHE3/5A 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 P4SMA20CAHE3/5A meets industry standards.
7.What is the process for return or replacement of P4SMA20CAHE3/5A?
All P4SMA20CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA20CAHE3/5A, 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 P4SMA20CAHE3/5A part is unused and in its original packaging.
Return procedure for P4SMA20CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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