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Vishay General Semiconductor - Diodes Division P4SMA24CAHM3/H
- Part No.:
- P4SMA24CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA24CAHM3/H.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
P4SMA24CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in signal and power lines. It features a 24 V standoff voltage (VWM), 26.7–29.5 V breakdown voltage (VBR) at 1 mA, 33.2 V clamping voltage (VC) at 12 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - ideal for safeguarding MOSFETs, sensor interfaces, and communication lines in automotive and industrial control systems.
For engineers reviewing the P4SMA24CAHM3/H datasheet, P4SMA24CAHM3/H pinout, P4SMA24CAHM3/H application, or P4SMA24CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, SMA (DO-214AC) package compatibility, low clamping ratio (VC/VBR ≈ 1.18), and halogen-free RoHS compliance under HM3 suffix.
Technical Context
The P4SMA24CAHM3/H operates as a voltage-clamped shunt protector: during transients exceeding its breakdown threshold, it avalanches to divert surge current away from downstream circuitry while maintaining a tightly controlled clamping voltage. Its glass-passivated junction ensures stable avalanche characteristics and long-term reliability under repetitive surge stress.
Designed for bidirectional operation, it suppresses positive and negative polarity transients without polarity sensitivity - eliminating need for orientation-aware placement. Its 120 °C/W junction-to-ambient thermal resistance and 150 °C maximum junction temperature support operation in thermally constrained PCB layouts with minimal copper pad area (0.2" × 0.2").
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff Voltage) | 20.5 V - Maximum continuous reverse working voltage before significant leakage; defines safe operating margin below clamping onset. |
| VBR (Breakdown Voltage) | 22.8–25.2 V at 1 mA - Confirmed avalanche initiation range; ensures predictable turn-on during fast transients. |
| VC (Clamping Voltage) | 33.2 V at 12 A IPPM - Peak voltage seen by protected circuit during 10/1000 µs surge; enables I/O stage survival under 400 W pulses. |
| PPPM (Peak Pulse Power) | 400 W - Sustains 10/1000 µs surges per IEEE C62.41; derates to 300 W above 91 V, but fully applicable at 24 V rating. |
| ID (Max Reverse Leakage) | 1.0 µA at VWM - Negligible standby power loss and signal integrity impact in high-impedance sensor or data lines. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with automated pick-and-place. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; designated by HM3 suffix. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional device with no polarity marking - symmetrical terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (negative polarity) | Conducts during negative-going surges; forms low-impedance path to ground or rail when reverse-biased beyond VBR. |
| Cathode | Transient current sink (positive polarity) | Conducts during positive-going surges; identical electrical behavior to Anode due to bidirectional symmetry. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints or external diode pairing. |
| 400 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) on properly routed PCB traces with minimal layout overhead. |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental requirements and supports lead-free reflow (MSL level 1, 260 °C peak). |
| Low clamping ratio (VC/VBR ≈ 1.18) | Minimizes voltage overshoot during suppression, reducing risk of latch-up or gate oxide damage in protected ICs. |
| 150 °C max junction temperature | Supports operation in under-hood automotive modules and industrial enclosures without active cooling. |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Line Protection |
|---|---|
Use Scenario: Protecting analog outputs of pressure, temperature, and position sensors connected to engine control units against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional shunt TVS placed across sensor output and ground to clamp transients before they reach ADC input or signal conditioning amplifier. Use Value: Prevents sensor signal corruption and microcontroller reset events caused by >100 V transients common in 12 V vehicle systems. |
Use Scenario: Safeguarding CAN_H and CAN_L differential pair against ESD and coupled surges in factory automation PLCs and motor drives. IC Role / Device Role / Timing Role: One P4SMA24CAHM3/H per line (CAN_H–GND and CAN_L–GND), leveraging bidirectional capability to suppress both polarities without polarity-sensitive placement. Use Value: Maintains CAN physical layer integrity during 8 kV contact ESD (IEC 61000-4-2) and 1 kV surge (IEC 61000-4-5), preventing bus lockup or node failure. |
| Telecom DSL Line Surge Protection | Consumer Appliance Motor Drive Snubbing |
Use Scenario: Shielding ADSL/VDSL line interface transformers and PHY ICs from lightning-induced surges entering via telephone wiring. IC Role / Device Role / Timing Role: Placed between transformer secondary and PHY receiver inputs to clamp common-mode transients up to 6 kV (IEC 61000-4-5). Use Value: Enables compliance with GR-1089-CORE telecom immunity standards while preserving low-capacitance signal fidelity (<20 pF typical). |
Use Scenario: Suppressing flyback voltage spikes generated by brushed DC motors in washing machines, HVAC blowers, and power tools. IC Role / Device Role / Timing Role: Mounted across motor terminals to absorb inductive energy during PWM commutation or sudden shutdown. Use Value: Eliminates arcing at switch contacts and prevents MOSFET drain-source breakdown in half-bridge drivers rated ≤30 V. |
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 (4.58 mm × 3.94 mm vs. SMA's 4.50 mm × 3.99 mm); 35.5 V VC at 17.1 A. | Better suited for higher-energy surges where board space allows larger footprint; not drop-in due to different pad layout and thermal mass. | Select SMBJ24CA when surge energy exceeds 400 W limits and PCB real estate permits SMB footprint. |
| 1.5KE24CA | Through-hole DO-15 package; 1500 W PPPM; 38.9 V VC at 38.8 A; higher leakage (5.0 µA at VWM). | Intended for legacy through-hole designs or high-power primary-side protection; incompatible with SMT assembly. | Choose 1.5KE24CA only for manual assembly or retrofit into existing through-hole boards requiring higher pulse handling. |
Compared with SMBJ24CA and 1.5KE24CA, the P4SMA24CAHM3/H delivers optimal balance of AEC-Q101 qualification, compact SMA footprint, and precise 24 V clamping for space-constrained automotive and industrial SMT designs - without compromising on surge robustness or regulatory compliance.
Availability
P4SMA24CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial CAN networks, telecom line interfaces, and consumer appliance motor controls requiring stable component supply, halogen-free compliance, and AEC-Q101 validation.
Supply support for P4SMA24CAHM3/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 optimization.
The P4SMA Series targets cost-effective, high-volume transient suppression in automotive, industrial, and communications equipment - delivering standardized TVS performance in compact, qualified surface-mount packages.
FAQ
What is the clamping voltage of the P4SMA24CAHM3/H under a 10/1000 µs surge?
The P4SMA24CAHM3/H has a maximum clamping voltage (VC) of 33.2 V at 12 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per standard test conditions (TA = 25 °C, mounted on 0.2" × 0.2" copper pads) and reflects the actual voltage imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the P4SMA24CAHM3/H suitable for automotive applications?
Yes, the P4SMA24CAHM3/H is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction validated for automotive use. It meets stress tests including temperature cycling, high-temperature reverse bias, and ESD - making it appropriate for engine control units, body electronics, and ADAS sensor interfaces where reliability under harsh conditions is mandatory.
Does the P4SMA24CAHM3/H have polarity markings?
No, the P4SMA24CAHM3/H is a bidirectional TVS diode and carries no polarity marking on its SMA (DO-214AC) package. Its symmetrical construction allows mounting in either orientation - simplifying PCB layout and eliminating orientation errors during automated assembly. This contrasts with unidirectional variants (e.g., P4SMA24A) that feature a cathode band.
What is the maximum junction temperature rating for the P4SMA24CAHM3/H?
The P4SMA24CAHM3/H has a maximum junction temperature (TJ) rating of +150 °C, as specified in Vishay's datasheet revision 09-Jan-2024. This allows reliable operation in under-hood automotive environments and sealed industrial enclosures without forced cooling, provided thermal design accounts for its 120 °C/W junction-to-ambient resistance under standard mounting conditions.
How does the P4SMA24CAHM3/H compare to unidirectional TVS diodes in circuit protection?
The P4SMA24CAHM3/H provides symmetric clamping for both positive and negative transients, unlike unidirectional types such as P4SMA24A which only protect against one polarity. This makes the P4SMA24CAHM3/H ideal for AC-coupled lines, differential buses (e.g., CAN, RS-485), or floating references where polarity reversal is possible - eliminating need for dual-diode configurations or polarity-aware routing.
P4SMA24CAHM3/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:
- 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/H FAQ
1.How can I place an order for P4SMA24CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA24CAHM3/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 P4SMA24CAHM3/H reliable?
The price and inventory of P4SMA24CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA24CAHM3/H is usually 5 days.
3.What payment methods are accepted for P4SMA24CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA24CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA24CAHM3/H?
P4SMA24CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA24CAHM3/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 P4SMA24CAHM3/H?
For technical support, including P4SMA24CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA24CAHM3/H requirements.
6.How does Aetrix verify that P4SMA24CAHM3/H is sourced from the original manufacturer or authorized distributors?
All P4SMA24CAHM3/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 P4SMA24CAHM3/H meets industry standards.
7.What is the process for return or replacement of P4SMA24CAHM3/H?
All P4SMA24CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA24CAHM3/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 P4SMA24CAHM3/H part is unused and in its original packaging.
Return procedure for P4SMA24CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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