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Vishay General Semiconductor - Diodes Division P4SMA24CAHM3/I
- Part No.:
- P4SMA24CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA24CAHM3/I.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,895
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Product details
Overview
P4SMA24CAHM3/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 or power lines. It features a 24 V standoff voltage (VWM), 26.7–29.5 V breakdown voltage (VBR) at 1 mA, 33.2 V maximum clamping voltage at 12 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - used in automotive sensor protection and industrial I/O interface surge suppression.
For engineers reviewing the P4SMA24CAHM3/I datasheet, P4SMA24CAHM3/I pinout, P4SMA24CAHM3/I application, or P4SMA24CAHM3/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance data, clamping performance under standardized surge conditions, and direct alternatives for automotive-grade transient protection design.
Technical Context
The P4SMA24CAHM3/I operates as a bidirectional avalanche diode, symmetrically clamping both positive and negative transients without polarity marking. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1 µA at VWM), while MSL Level 1 moisture sensitivity supports lead-free reflow up to 260 °C peak.
Rated for -65 °C to +150 °C operating junction temperature, it delivers 3.3 W steady-state power dissipation on infinite heatsink at 50 °C ambient and exhibits 120 °C/W junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads - enabling predictable thermal derating in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 24 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin for 24 V nominal systems. |
| VBR (Breakdown Voltage) | 26.7–29.5 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system operating voltage. |
| VC (Clamping Voltage) | 33.2 V at 12 A IPPM - Peak voltage seen by protected circuit during 10/1000 µs surge; critical for IC-level overvoltage margining. |
| PPPM (Peak Pulse Power) | 400 W - Sustained energy absorption capability per single 10/1000 µs transient; validated per REA-defined waveform. |
| ID (Reverse Leakage) | <1 µA at 24 V - Minimal standby current draw; preserves signal integrity and battery life in always-on interfaces. |
| TJ max | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive and industrial environments. |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD; suffix HM3 denotes halogen-free RoHS-compliant AEC-Q101 grade. |
Pinout & Package
Package: SMA (DO-214AC) - Surface-mount plastic case with matte tin-plated leads, UL 94 V-0 rated molding compound, and J-STD-002/JESD 22-B102 solderability compliance. No polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during negative transient | Symmetric terminal enabling bidirectional clamping; connects to line being protected (e.g., CAN_H or RS-485 A). |
| Cathode | Current entry terminal during positive transient | Symmetric terminal - electrically identical to Anode in bidirectional mode; ties to same protected line or ground reference. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential lines (e.g., USB D+/D-, 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) | Validated for automotive applications including body control modules, ADAS sensor interfaces, and infotainment power rails. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a/5a), improving clamping fidelity. |
| MSL Level 1, 260 °C peak | Supports standard lead-free reflow profiles without preconditioning; eliminates moisture-related popcorning risk. |
Applications
| Automotive Sensor Interface | Industrial RS-485 Communication |
|---|---|
Use Scenario: Protecting analog outputs of pressure/temperature sensors connected to vehicle ECUs against load dump and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional TVS placed between sensor signal line and chassis ground to clamp ±30 V transients. Use Value: Maintains signal accuracy below 33.2 V clamping threshold while surviving repeated 400 W surges per AEC-Q101 stress cycles. |
Use Scenario: Safeguarding RS-485 transceiver bus lines (A/B) in factory automation PLCs exposed to motor drive EMI and ground bounce. IC Role / Device Role / Timing Role: Differential-line TVS mounted across A–B terminals to suppress common-mode and differential-mode transients. Use Value: Prevents transceiver latch-up by limiting voltage excursions to ≤33.2 V during 10/1000 µs surges up to 12 A peak. |
| Consumer USB Port Protection | Telecom DSL Line Surge Guard |
Use Scenario: Shielding USB 2.0 data lines in set-top boxes from ESD events and hot-plug induced transients. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed inline on D+ and D− traces before the USB controller. Use Value: Adds <1 µA leakage and negligible capacitance impact while meeting IEC 61000-4-2 ±15 kV contact discharge immunity. |
Use Scenario: Front-end protection of ADSL/VDSL line interface circuits in residential gateways subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge limiter on twisted-pair telephone line input, coordinated with gas discharge tube (GDT) secondary protection. Use Value: Clamps fast-rising surges to 33.2 V before GDT fires, reducing let-through energy to downstream silicon. |
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 | Higher 600 W PPPM rating; larger SMB (DO-214AA) package; 38.9 V VC at 17.3 A. | Better suited for higher-energy surges but requires larger board area and has slower response due to higher junction capacitance. | Select when system-level surge tests exceed IEC 61000-4-5 Level 4 and PCB layout allows SMB footprint. |
| 1.5KE24CA | Through-hole TO-218 package; 1500 W PPPM; 38.9 V VC at 38.8 A; no AEC-Q101 qualification. | Used in legacy industrial power supplies where manual assembly and high-energy clamping dominate over automotive reliability. | Choose only for non-automotive, high-surge, through-hole designs where AEC-Q101 is not required. |
Compared with SMBJ24CA and 1.5KE24CA, the P4SMA24CAHM3/I offers optimal balance of AEC-Q101 compliance, compact SMA footprint, and verified 400 W surge handling - making it the preferred choice for space-constrained automotive and industrial surface-mount transient protection where qualification and layout density are critical.
Availability
P4SMA24CAHM3/I 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 and long-term lifecycle support.
Supply support for P4SMA24CAHM3/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, rectifiers, MOSFETs, and TVS devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The P4SMA Series targets cost-sensitive yet robust transient protection needs in automotive, industrial, and communications equipment - delivering AEC-Q101 qualified, halogen-free TVS diodes in compact surface-mount packages for high-volume automated assembly.
FAQ
What does the "CA" suffix mean in P4SMA24CAHM3/I?
The "CA" suffix in P4SMA24CAHM3/I indicates a bidirectional Transient Voltage Suppressor configuration - meaning it clamps voltage transients equally in both polarities without cathode band marking. This enables use on AC-coupled or differential signal lines such as RS-485, CAN, or USB, where polarity reversal is possible. The P4SMA24CAHM3/I is not polarity-sensitive and functions identically regardless of terminal orientation.
Is P4SMA24CAHM3/I qualified for automotive applications?
Yes, P4SMA24CAHM3/I is AEC-Q101 qualified - confirmed by Vishay's documentation and indicated by the "HM3" suffix, which denotes halogen-free, RoHS-compliant, and automotive-grade construction. It has passed stress tests including high-temperature operating life (HTOL), temperature cycling (TCT), and ESD per AEC-Q101 Rev D, making it suitable for under-hood and cabin electronics in passenger vehicles and commercial vehicles.
What is the maximum clamping voltage of P4SMA24CAHM3/I and under what test condition?
The maximum clamping voltage of P4SMA24CAHM3/I is 33.2 V, measured at 12 A peak pulse current (IPPM) using the standardized 10/1000 µs double-exponential surge waveform per REA definition. This value represents the highest voltage the device allows to appear across protected circuitry during a worst-case transient event, directly informing system-level overvoltage margining for downstream ICs.
How does the thermal resistance of P4SMA24CAHM3/I affect PCB layout?
P4SMA24CAHM3/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. To maintain safe junction temperatures under sustained power dissipation, designers must allocate sufficient copper area and avoid excessive trace length or isolation. For continuous 3.3 W operation, thermal vias and internal ground planes are recommended to reduce effective RθJA below 80 °C/W.
Can P4SMA24CAHM3/I replace unidirectional TVS diodes like P4SMA24AHM3/I in existing designs?
No - P4SMA24CAHM3/I is strictly bidirectional and cannot substitute for unidirectional variants like P4SMA24AHM3/I without circuit review. Unidirectional types include a cathode band and conduct forward current, enabling DC biasing and rectification roles; bidirectional types lack polarity and conduct symmetrically. Swapping requires verifying that the protected line is AC-coupled or truly bidirectional, and that no DC path exists through the TVS.
P4SMA24CAHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for P4SMA24CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA24CAHM3/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/I reliable?
The price and inventory of P4SMA24CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for P4SMA24CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA24CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA24CAHM3/I?
P4SMA24CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA24CAHM3/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/I?
For technical support, including P4SMA24CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA24CAHM3/I requirements.
6.How does Aetrix verify that P4SMA24CAHM3/I is sourced from the original manufacturer or authorized distributors?
All P4SMA24CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of P4SMA24CAHM3/I?
All P4SMA24CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA24CAHM3/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/I part is unused and in its original packaging.
Return procedure for P4SMA24CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA24CAHM3/I Tags
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