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Vishay General Semiconductor - Diodes Division P4SMA12CAHE3_A/H
- Part No.:
- P4SMA12CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA12CAHE3_A/H.pdf
- Description:
- TVS DIODE 10.2VWM 16.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,197
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Product details
Overview
P4SMA12CAHE3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal and power lines. It features a 12 V standoff voltage (VWM), 13.3 V minimum breakdown voltage (VBR), 400 W peak pulse power (10/1000 µs), and 19.9 V maximum clamping voltage at 24.0 A peak pulse current - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the P4SMA12CAHE3_A/H datasheet, P4SMA12CAHE3_A/H pinout, P4SMA12CAHE3_A/H application, or P4SMA12CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150 °C junction temperature rating, low incremental surge resistance, and compatibility with automated SMT placement on standard PCB pads.
Technical Context
The P4SMA12CAHE3_A/H operates as a bidirectional avalanche diode, symmetrically clamping transient overvoltages in both polarities without polarity marking. Its glass-passivated junction enables fast response time (<1 ns) and stable breakdown characteristics across temperature.
It delivers 400 W peak pulse power per 10/1000 µs waveform at 25 °C, derated linearly above TA = 25 °C with RθJA = 120 °C/W, and supports repetitive surges at 0.01% duty cycle. The device meets MSL Level 1 and is qualified to AEC-Q101 for automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 12 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 12 V nominal systems. |
| VBR (Breakdown Voltage) | 13.3–14.7 V at 1 mA - Confirmed avalanche initiation range; ensures reliable triggering during ESD or load-switching transients. |
| VC (Clamping Voltage) | 19.9 V at IPPM = 24.0 A - Peak voltage seen by protected circuit during worst-case 10/1000 µs surge; critical for IC-level robustness. |
| PPPM (Peak Pulse Power) | 400 W - Sustains high-energy transients (e.g., ISO 7637-2 Pulse 1/2a/5a) on automotive supply rails and data lines. |
| ID (Reverse Leakage) | 1.0 µA max at VWM - Negligible standby current; avoids signal integrity degradation in high-impedance sensor paths. |
| TJ max | 150 °C - Enables operation in under-hood automotive environments and industrial enclosures without thermal derating penalties. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); matte tin-plated leads, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Common terminal for symmetrical clamping; connects to protected line (e.g., CAN_H or RS-485 A) and ground reference via PCB layout. |
| Cathode | Transient return path (bidirectional) | Electrically identical to anode in bidirectional devices; no functional distinction - both terminals serve as interchangeable surge conduction paths. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., CAN, RS-485) without polarity concerns. |
| 400 W peak pulse power | Withstands ISO 16750-2 load dump surges and IEC 61000-4-5 combination wave (10/700 µs) up to 4 kV on 2 Ω source impedance. |
| AEC-Q101 qualification | Validated for automotive electronics including engine control units, body controllers, and ADAS sensor modules requiring long-term field reliability. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow at 260 °C peak - compatible with standard lead-free SMT assembly without baking. |
| Glass passivated junction | Ensures stable VBR over 1000+ surge events and eliminates parameter drift due to humidity or contamination in harsh environments. |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed between sensor output and microcontroller ADC input. Use Value: Limits transient voltage to ≤19.9 V, preventing latch-up or damage to 3.3 V/5 V ADC front-end while maintaining <1 µA leakage at 12 V rail. |
Use Scenario: Shielding RS-485 transceiver (e.g., SN65HVD230) from ESD and lightning-induced surges on factory-floor communication buses. IC Role / Device Role / Timing Role: Line-to-line and line-to-ground transient suppressor on differential pair (A/B) and common-mode ground path. Use Value: Clamps ±15 kV contact ESD (IEC 61000-4-2) and 4 kV surge (IEC 61000-4-5) without degrading signal integrity up to 10 Mbps. |
| Consumer USB Port Protection | Telecom DSL Line Protection |
Use Scenario: Safeguarding USB 2.0 D+/D− lines in set-top boxes and smart home gateways against human-body-model ESD events. IC Role / Device Role / Timing Role: Bidirectional TVS array element placed directly at USB connector, before ESD-rated USB transceiver. Use Value: Responds in <1 ns to divert >8 kV ESD pulses while adding only ~30 pF capacitance - preserving signal rise time and eye diagram integrity. |
Use Scenario: Front-end surge suppression on ADSL/VDSL line cards handling outdoor copper loop exposure in telecom cabinets. IC Role / Device Role / Timing Role: Primary protection stage between line transformer secondary and DSL PHY IC, rated for repeated 10/1000 µs surges. Use Value: Absorbs 400 W transient energy without failure, enabling compliance with GR-1089-CORE Level 3 surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA | Same VWM (12 V), higher PPPM (600 W), larger SMB (DO-214AA) package (4.57 mm × 3.94 mm). | Preferred where board space allows larger footprint and higher surge margin is required (e.g., industrial power supplies). | Select SMBJ12CA when 600 W surge rating is mandatory and PCB pad area permits 30% larger footprint than SMA. |
| 1.5KE12CA | Same VWM (12 V), higher PPPM (1500 W), axial-leaded DO-15 package - not SMT-compatible. | Used in legacy through-hole designs or prototyping; incompatible with automated SMT assembly. | Choose 1.5KE12CA only for hand-soldered repairs or non-SMT applications where axial mounting is acceptable. |
Compared with P4SMA12CAHE3_A/H, SMBJ12CA offers higher surge capacity in a slightly larger SMT package, while 1.5KE12CA provides legacy axial-mount compatibility but sacrifices automated assembly support and board-space efficiency.
Availability
P4SMA12CAHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, consumer USB ports, and telecom DSL line protection requiring stable component supply, AEC-Q101 compliance, and consistent surge performance across production batches.
Supply support for P4SMA12CAHE3_A/H 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The P4SMA Series targets cost-sensitive, high-volume transient protection needs in automotive, industrial, and communications equipment - optimized for SMT scalability, AEC-Q101 compliance, and robust clamping performance in compact SMA packages.
FAQ
What is the clamping voltage of the P4SMA12CAHE3_A/H at its rated peak pulse current?
The P4SMA12CAHE3_A/H has a maximum clamping voltage (VC) of 19.9 V at 24.0 A peak pulse current (IPPM), measured under the standard 10/1000 µs waveform. This value ensures downstream ICs such as microcontrollers or transceivers remain within safe operating voltage limits during surge events. The P4SMA12CAHE3_A/H maintains this clamping performance across its full operating temperature range of -65 °C to +150 °C.
Is the P4SMA12CAHE3_A/H suitable for automotive applications?
Yes, the P4SMA12CAHE3_A/H is AEC-Q101 qualified and specifically designed for automotive use, including engine control, body electronics, and ADAS sensor modules. Its construction includes glass-passivated junctions, MSL Level 1 moisture sensitivity rating, and validated performance across extended temperature and humidity stress tests. The P4SMA12CAHE3_A/H meets automotive surge immunity standards including ISO 7637-2 and ISO 16750-2.
How does the bidirectional configuration of the P4SMA12CAHE3_A/H affect its circuit implementation?
The P4SMA12CAHE3_A/H has no polarity marking and functions identically in both directions, making it ideal for protecting AC-coupled or differential signal lines like CAN, RS-485, or USB without orientation constraints. It is mounted across the protected line and ground (or between differential pairs), with both terminals serving as symmetrical conduction paths. This eliminates assembly errors and simplifies layout versus unidirectional alternatives. The P4SMA12CAHE3_A/H achieves this using matched avalanche structures in a single die.
What is the thermal resistance of the P4SMA12CAHE3_A/H, and how does it impact power dissipation?
The P4SMA12CAHE3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value determines steady-state power derating: at 50 °C ambient, its DC power dissipation (PD) is rated at 3.3 W. For transient events, thermal mass dominates, allowing 400 W peak pulse power despite the relatively high RθJA. The P4SMA12CAHE3_A/H relies on short-duration surge energy rather than continuous thermal dissipation.
Does the P4SMA12CAHE3_A/H require special PCB layout considerations?
Yes - optimal performance requires minimum recommended pad layout per Vishay's DO-214AC footprint: 0.074" (1.88 mm) pad width, 0.208" (5.28 mm) pad length, and 0.066" (1.68 mm) spacing between pads. Short, wide traces to ground minimize inductance and preserve clamping speed. Avoid thermal relief on pads to maximize heat spreading. The P4SMA12CAHE3_A/H benefits from direct connection to internal ground planes and should be placed as close as possible to the protected interface connector or IC pin.
P4SMA12CAHE3_A/H 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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 10.2V
- Voltage - Breakdown (Min):
- 11.4V
- Voltage - Clamping (Max) @ Ipp:
- 16.7V
- Current - Peak Pulse (10/1000µs):
- 24A
- 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)
P4SMA12CAHE3_A/H FAQ
1.How can I place an order for P4SMA12CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA12CAHE3_A/H 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 P4SMA12CAHE3_A/H reliable?
The price and inventory of P4SMA12CAHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA12CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for P4SMA12CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA12CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA12CAHE3_A/H?
P4SMA12CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA12CAHE3_A/H 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 P4SMA12CAHE3_A/H?
For technical support, including P4SMA12CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA12CAHE3_A/H requirements.
6.How does Aetrix verify that P4SMA12CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All P4SMA12CAHE3_A/H 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 P4SMA12CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of P4SMA12CAHE3_A/H?
All P4SMA12CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA12CAHE3_A/H, 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 P4SMA12CAHE3_A/H part is unused and in its original packaging.
Return procedure for P4SMA12CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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