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Vishay General Semiconductor - Diodes Division P4SMA24CAHM3_A/I
- Part No.:
- P4SMA24CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA24CAHM3_A/I.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P4SMA24CAHM3_A/I 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 24 V standoff voltage (VWM), 25.2 V minimum breakdown voltage (VBR), 33.2 V maximum clamping voltage (VC) at 12 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the P4SMA24CAHM3_A/I datasheet, P4SMA24CAHM3_A/I pinout, P4SMA24CAHM3_A/I application, or P4SMA24CAHM3_A/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), clamping performance under surge conditions, and direct alternatives for ESD/transient protection design-in.
Technical Context
The P4SMA24CAHM3_A/I operates as a bidirectional avalanche diode, symmetrically clamping both positive and negative transients without polarity dependence. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1 µA at 20.5 V), while meeting J-STD-020 MSL Level 1 reflow compatibility (260 °C peak).
Rated for 150 °C maximum junction temperature and 3.3 W steady-state power dissipation, it delivers repeatable transient suppression in automotive-grade applications. The device's 0.094 %/°C temperature coefficient of VBR enables predictable voltage shift across operating range, and its 30 Ω typical incremental surge resistance supports fast energy absorption during EFT or lightning-induced surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 20.5 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown) | 22.8–25.2 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering within ±5 % tolerance at rated test current. |
| VC (Clamping) | 33.2 V at 12 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; limits stress on downstream ICs. |
| PPPM | 400 W - Sustains single 10/1000 µs transient pulses without degradation; derates to 300 W above 91 V per spec. |
| IPPM | 12 A - Peak surge current capability at VC; determines minimum trace width and PCB copper area needed for thermal management. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs derating above 25 °C ambient. |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT; suffix HM3 denotes halogen-free RoHS compliance. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Cathode/anode terminals are symmetrical; device functions identically in either orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Connects to ground or common reference; completes clamping loop for both polarities of surge event. |
| Cathode | Transient return path (bidirectional) | Electrically identical to anode in bidirectional TVS; no functional distinction - device is symmetric. |
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 IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) when properly laid out on 5 mm × 5 mm copper pads. |
| AEC-Q101 qualified + HM3 suffix | Halogen-free, RoHS-compliant construction validated for automotive under-hood and body-control module environments. |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V or 5 V logic interfacing with 24 V systems. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C); eliminates baking requirement prior to assembly. |
Applications
| Automotive Sensor Interface | Industrial PLC Analog Input |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver pins and Hall-effect sensor outputs from load-dump and inductive switching transients in 12 V/24 V vehicle networks. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector entry point to shunt surge energy before reaching ASIC or microcontroller I/O. Use Value: Clamps 33.2 V max during 12 A surge, preventing latch-up or gate oxide damage in automotive-grade MCUs operating up to 36 V supply. |
Use Scenario: Safeguarding 4–20 mA current-loop inputs and 0–10 V analog channels in programmable logic controllers against field-wiring induced surges. IC Role / Device Role / Timing Role: Primary front-end transient suppressor mounted adjacent to terminal block, coordinated with series current-limiting resistors. Use Value: Maintains signal integrity below 33.2 V clamping level while surviving repeated 400 W pulses - extends field-replacement interval in factory automation. |
| Consumer Power Adapter Feedback Path | Telecom Ethernet PHY Protection |
Use Scenario: Shielding optocoupler feedback signals and voltage-sense lines in isolated AC/DC adapters from mains-borne transients. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) TVS placed between secondary-side controller and isolation barrier to prevent false regulation trips. Use Value: 20.5 V VWM aligns with typical 24 V auxiliary rails; 33.2 V VC avoids crossing controller overvoltage thresholds during surge events. |
Use Scenario: Guarding 10/100/1000BASE-T Ethernet PHY differential pairs against ESD and lightning-induced surges in network switches and routers. IC Role / Device Role / Timing Role: Bidirectional TVS array element protecting each pair (e.g., TX+/TX−, RX+/RX−) with matched clamping characteristics. Use Value: Symmetric response ensures equal protection for both signal polarities; 12 A IPPM meets IEC 61000-4-5 10/700 µs coupling requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA | Same VWM/VBR/VC specs but SMB (DO-214AA) package - 2.5 mm wider, higher RθJA (100 °C/W), lower IPPM (13.7 A). | Requires larger PCB footprint; better suited for non-space-constrained industrial modules than automotive ECUs. | Select when board layout allows larger pad area and thermal budget permits higher junction temperature rise. |
| 1.5KE24CA | Through-hole DO-201 package; same electrical specs but 1500 W peak power, higher IPPM (62.5 A), and slower response due to parasitic inductance. | Used in legacy power supplies and AC mains input stages where manual assembly or high-energy surges dominate. | Choose only for through-hole designs needing >400 W surge handling - not drop-in compatible with P4SMA24CAHM3_A/I layout. |
Compared with SMBJ24CA and 1.5KE24CA, the P4SMA24CAHM3_A/I offers optimal balance of space efficiency (SMA footprint), AEC-Q101 qualification, and 400 W surge capability - making it the preferred choice for modern automotive and compact industrial PCBs requiring surface-mount reliability and halogen-free compliance.
Availability
P4SMA24CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial analog input conditioning, and telecom PHY interface hardening requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for P4SMA24CAHM3_A/I 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade validation.
The P4SMA Series targets cost-sensitive, high-volume transient protection needs in automotive, industrial, and consumer electronics - engineered for robustness under repetitive surge stress and compatibility with automated SMT assembly.
FAQ
What is the maximum clamping voltage of the P4SMA24CAHM3_A/I under a 10/1000 µs surge?
The P4SMA24CAHM3_A/I has a maximum clamping voltage (VC) of 33.2 V at 12 A peak pulse current with a 10/1000 µs waveform. This value is measured per Figure 1 in the Vishay datasheet 88367 and defines the upper voltage limit imposed on protected circuitry during standardized surge testing - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the P4SMA24CAHM3_A/I suitable for automotive applications?
Yes, the P4SMA24CAHM3_A/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction. It is specifically intended for automotive use cases such as sensor interface protection and body control module I/O hardening, with full validation across temperature cycling, high-temperature reverse bias, and humidity testing per the AEC standard.
What does the "CA" suffix mean in P4SMA24CAHM3_A/I?
The "CA" suffix in P4SMA24CAHM3_A/I denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., P4SMA24A), the CA version has no polarity marking and functions identically regardless of orientation on the PCB.
What is the thermal resistance of the P4SMA24CAHM3_A/I?
The P4SMA24CAHM3_A/I 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 assumes standard JEDEC test conditions and guides thermal derating above 25 °C ambient - for example, at 85 °C ambient, maximum allowable power drops to ~1.8 W.
How does the P4SMA24CAHM3_A/I differ from the P4SMA24A variant?
The P4SMA24CAHM3_A/I is bidirectional with no polarity marking and symmetric clamping behavior, whereas the P4SMA24A is unidirectional with a cathode band and conducts only in reverse bias. Electrically, P4SMA24CAHM3_A/I has identical VWM, VBR, and VC values but supports AC or differential line protection without orientation constraints - essential for CAN, RS-485, or audio signal paths.
P4SMA24CAHM3_A/I 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):
- 20.5V
- Voltage - Breakdown (Min):
- 22.8V
- Voltage - Clamping (Max) @ Ipp:
- 33.2V
- Current - Peak Pulse (10/1000µs):
- 12A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA24CAHM3_A/I FAQ
1.How can I place an order for P4SMA24CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA24CAHM3_A/I 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 P4SMA24CAHM3_A/I reliable?
The price and inventory of P4SMA24CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA24CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for P4SMA24CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA24CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA24CAHM3_A/I?
P4SMA24CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA24CAHM3_A/I 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 P4SMA24CAHM3_A/I?
For technical support, including P4SMA24CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA24CAHM3_A/I requirements.
6.How does Aetrix verify that P4SMA24CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All P4SMA24CAHM3_A/I 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 P4SMA24CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of P4SMA24CAHM3_A/I?
All P4SMA24CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA24CAHM3_A/I, 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 P4SMA24CAHM3_A/I part is unused and in its original packaging.
Return procedure for P4SMA24CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA24CAHM3_A/I Tags
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