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Vishay General Semiconductor - Diodes Division P4SMA24CAHM3_A/H
- Part No.:
- P4SMA24CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA24CAHM3_A/H.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,898
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Product details
Overview
P4SMA24CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for clamping voltage transients on signal and power lines. It features a 24 V standoff voltage (VWM), 27.6 V maximum clamping voltage at 12 A peak pulse current, and 400 W peak pulse power capability with a 10/1000 µs waveform - used in automotive sensor interfaces, industrial I/O protection, and telecom line surge suppression.
For engineers reviewing the P4SMA24CAHM3_A/H datasheet, P4SMA24CAHM3_A/H pinout, P4SMA24CAHM3_A/H application, or P4SMA24CAHM3_A/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification for automotive use, low thermal resistance (RθJL = 30 °C/W), and compatibility with automated SMT placement on DO-214AC footprints.
Technical Context
The P4SMA24CAHM3_A/H operates as a bidirectional avalanche diode, conducting in both directions when transient voltage exceeds its breakdown threshold of 26.7–29.7 V at 1 mA test current. Its glass-passivated junction ensures stable reverse leakage (<1 µA at 20.5 V) and fast response time (<1 ns) to ESD and lightning-induced surges.
Thermally, it is rated for junction temperatures from –65 °C to +150 °C and derates linearly above 25 °C ambient, with RθJA = 120 °C/W on standard 0.2" × 0.2" copper pads. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification per stress test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 20.5 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (Breakdown Voltage) | 26.7–29.7 V at 1 mA - Symmetrical avalanche onset in both directions; ensures consistent clamping behavior across polarity. |
| VC (Clamping Voltage) | 33.2 V at 12 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; enables robust IC-level protection. |
| PPPM (Peak Pulse Power) | 400 W - Sustains high-energy transients without failure; supports IEC 61000-4-5 Level 4 compliance with proper PCB layout. |
| IPPM (Peak Pulse Current) | 12 A - Maximum non-repetitive surge current handled; determines minimum trace width and pad copper requirements. |
| TJmax | +150 °C - Enables operation in under-hood automotive environments and high-ambient industrial enclosures. |
| Package | SMA (DO-214AC) - Standardized 2-pin SMD outline with 5.28 mm body length; compatible with JEDEC MS-013AC footprint and reflow profiles. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional device with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. Molding compound meets UL 94 V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Conducts surge current into device during positive or negative overvoltage events; connects to line being protected. |
| Cathode | Transient current exit (bidirectional) | Completes conduction path to ground or return rail; symmetric with anode due to bidirectional construction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces per stress test requirements. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates for global OEM supply chains without compromising surge robustness. |
| 400 W peak pulse power (10/1000 µs) | Supports high-energy surge immunity in industrial Ethernet ports and CAN FD bus lines without external series impedance. |
| Low clamping ratio (VC/VBR ≈ 1.18) | Minimizes voltage overshoot during clamping, reducing risk of latch-up or damage to downstream 3.3 V or 5 V logic. |
| MSL Level 1 (260 °C peak) | Enables single-pass lead-free reflow assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN bus and analog sensor inputs (e.g., temperature, pressure) in vehicle cabin modules from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and chassis ground to clamp ±100 V transients within nanoseconds. Use Value: Prevents sensor IC damage while maintaining signal integrity due to low capacitance (<100 pF at 0 V) and symmetrical clamping. |
Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from inductive kickback and field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact inputs, mounted directly at terminal block entry point. Use Value: Withstands repetitive 400 W surges without degradation, enabling >100,000 switching cycles in factory automation environments. |
| Telecom Line Interface | Consumer USB Port ESD Protection |
|
Use Scenario: Safeguarding RS-485 transceivers in base station backhaul links against lightning-induced common-mode surges on twisted-pair lines. IC Role / Device Role / Timing Role: Differential-mode TVS pair (two devices) across A/B lines referenced to ground, absorbing up to 12 A surge current. Use Value: Clamps to ≤33.2 V within <1 ns, preserving transceiver common-mode range and preventing false data toggling. |
Use Scenario: Adding secondary surge protection on VBUS and D+/D− lines of USB 2.0 ports in smart home hubs exposed to user-handling ESD. IC Role / Device Role / Timing Role: Secondary clamping stage after polymer PTC, handling residual energy that bypasses primary protection. Use Value: AEC-Q101 qualification ensures reliability under thermal cycling and vibration - critical for consumer product field longevity. |
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 (20.5 V) and VC (38.9 V), but 600 W PPPM in larger SMB (DO-214AA) package; higher IPPM (15.4 A). | Better suited for higher-energy surges where board space allows larger footprint; not drop-in due to different pad layout. | Select SMBJ24CA only if surge energy exceeds 400 W and PCB real estate permits SMB package. |
| 1.5KE24CA | Through-hole TO-204AE (DO-15); same VWM/VC specs but 1500 W PPPM; higher thermal mass but incompatible with SMT lines. | Used in legacy designs or high-reliability power supplies where manual assembly or wave soldering is acceptable. | Choose 1.5KE24CA only for through-hole production or when higher surge margin justifies assembly cost and footprint penalty. |
Compared with SMBJ24CA and 1.5KE24CA, the P4SMA24CAHM3_A/H delivers optimal balance of AEC-Q101 compliance, SMT manufacturability, and 400 W surge handling in the smallest standardized surface-mount TVS package - making it preferred for space-constrained automotive and industrial edge nodes.
Availability
P4SMA24CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O terminals, and telecom line interface circuits requiring stable component supply, long-term lifecycle support, and AEC-Q101-qualified surge protection.
Supply support for P4SMA24CAHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The P4SMA Series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where AEC-Q101 qualification, low-profile SMT packaging, and repeatable clamping performance are mandatory.
FAQ
What does the "HM3" suffix indicate in P4SMA24CAHM3_A/H?
The HM3 suffix in P4SMA24CAHM3_A/H denotes halogen-free, RoHS-compliant construction with full AEC-Q101 qualification. It confirms compliance with automotive stress testing (including temperature cycling, humidity bias, and HTRB), and guarantees material content meets global environmental regulations without sacrificing electrical performance or surge robustness. This makes P4SMA24CAHM3_A/H suitable for under-hood and safety-critical automotive applications.
Is P4SMA24CAHM3_A/H unidirectional or bidirectional, and how is polarity identified?
P4SMA24CAHM3_A/H is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients. Unlike unidirectional variants (e.g., P4SMA24A), it has no cathode band marking - the SMA package is unmarked to reflect its dual-polarity functionality. This eliminates orientation errors during automated placement and simplifies design for AC-coupled or differential signal lines.
What is the maximum clamping voltage of P4SMA24CAHM3_A/H under standard test conditions?
The maximum clamping voltage of P4SMA24CAHM3_A/H is 33.2 V when subjected to a 10/1000 µs surge waveform at 12 A peak pulse current (IPPM). This value is measured per industry-standard conditions (TA = 25 °C, mounted on 0.2" × 0.2" copper pads) and represents the highest voltage the protected circuit will experience during a defined transient event - critical for ensuring compatibility with 3.3 V or 5 V logic interfaces.
Can P4SMA24CAHM3_A/H replace P4SMA24CAHE3_A/H in an existing design?
Yes, P4SMA24CAHM3_A/H can directly replace P4SMA24CAHE3_A/H in most applications because both share identical electrical specifications (VWM, VBR, VC, PPPM) and SMA package dimensions. The only difference is material composition: HM3 is halogen-free while HE3 is standard RoHS-compliant. No PCB layout or firmware changes are required, and both meet AEC-Q101 - making P4SMA24CAHM3_A/H a drop-in upgrade for stricter environmental compliance.
What thermal derating applies to P4SMA24CAHM3_A/H above 25 °C ambient?
P4SMA24CAHM3_A/H follows linear thermal derating above 25 °C ambient: its peak pulse power rating decreases by approximately 0.33 W/°C (based on RθJA = 120 °C/W). At 85 °C ambient, the usable PPPM drops to ~200 W. For sustained reliability in high-temperature environments, designers should verify layout copper area and airflow - and consider using the lower-derate RθJL = 30 °C/W path to PCB internal planes when optimizing thermal performance.
P4SMA24CAHM3_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):
- 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/H FAQ
1.How can I place an order for P4SMA24CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA24CAHM3_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 P4SMA24CAHM3_A/H reliable?
The price and inventory of P4SMA24CAHM3_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 P4SMA24CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for P4SMA24CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA24CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA24CAHM3_A/H?
P4SMA24CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA24CAHM3_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 P4SMA24CAHM3_A/H?
For technical support, including P4SMA24CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA24CAHM3_A/H requirements.
6.How does Aetrix verify that P4SMA24CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All P4SMA24CAHM3_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 P4SMA24CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of P4SMA24CAHM3_A/H?
All P4SMA24CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA24CAHM3_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 P4SMA24CAHM3_A/H part is unused and in its original packaging.
Return procedure for P4SMA24CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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