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Vishay General Semiconductor - Diodes Division 1.5SMC24CAHM3_A/I
- Part No.:
- 1.5SMC24CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC24CAHM3_A/I.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,397
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Product details
Overview
1.5SMC24CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMC (DO-214AB) package, designed for high-energy surge protection. 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 45.2 A peak pulse current, and 1500 W peak pulse power capability with a 10/1000 μs waveform - used to protect automotive sensor signal lines, industrial I/O ports, and telecom interface circuits against lightning-induced transients and inductive switching spikes.
For engineers reviewing the 1.5SMC24CAHM3_A/I datasheet, 1.5SMC24CAHM3_A/I pinout, 1.5SMC24CAHM3_A/I application, or 1.5SMC24CAHM3_A/I equivalent, this part delivers AEC-Q101 qualification, halogen-free RoHS compliance, MSL Level 1 moisture sensitivity, and low incremental surge resistance - critical for automotive-grade ESD/surge protection in harsh environments where reliability under repetitive transient stress is required.
Technical Context
The 1.5SMC24CAHM3_A/I operates as a bidirectional avalanche diode, symmetrically clamping voltage surges above ±26.7 V in both polarities without polarity marking. Its glass-passivated junction enables fast response time (<1 ns) and stable breakdown characteristics across temperature, with a typical thermal resistance of 75 °C/W (junction-to-ambient) on standard 8 mm × 8 mm copper pads.
It is rated for continuous power dissipation of 6.5 W at 50 °C ambient, supports 150 °C maximum junction temperature, and exhibits ≤1.0 μA reverse leakage at 20.5 V (VWM), ensuring minimal standby power impact in always-on systems like automotive body control modules and industrial PLC inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 20.5 V - Maximum continuous reverse voltage before significant conduction; defines safe operating margin below clamping threshold. |
| VBR (Breakdown) | 26.7–29.5 V at 1 mA - Guaranteed avalanche initiation range; ensures predictable turn-on during transients. |
| VC (Clamping) | 33.2 V at 45.2 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines downstream component stress. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 μs waveform; supports robust lightning surge immunity (IEC 61000-4-5 Level 4). |
| Package | SMC (DO-214AB) - Surface-mount package with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place and reflow. |
| AEC-Q101 | Qualified - Validated for automotive applications including engine control, ADAS sensors, and infotainment interfaces per stress test requirements. |
| Moisture Sensitivity | MSL Level 1 - No floor life limitation; can be stored indefinitely at <30 °C/60% RH and assembled without baking. |
Pinout & Package
Package: SMC (DO-214AB), bidirectional configuration - no polarity marking; symmetrical terminals function identically as anode/cathode depending on transient polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as current entry point during positive or negative transients; no fixed polarity. |
| Terminal 2 | Anode/Cathode (bidirectional) | Complementary terminal; forms symmetrical clamping path across protected line and ground or differential pair. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN bus, RS-485) without polarity concerns. |
| 1500 W peak pulse rating | Withstands 45.2 A transient current at 33.2 V clamp, meeting IEC 61000-4-5 surge immunity requirements for industrial and automotive systems. |
| Glass-passivated junction | Ensures long-term stability of breakdown voltage and low leakage (<1 μA) over temperature and lifetime, critical for safety-critical sensing. |
| AEC-Q101 qualified & halogen-free | Meets automotive reliability standards and environmental compliance (RoHS, JESD201 Class 2 whisker resistance) for under-hood and chassis applications. |
| Low profile SMC package | Height ≤2.62 mm allows integration into space-constrained PCB layouts while maintaining thermal performance via copper pad heatsinking. |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
Use Scenario: Protecting LIN bus and analog sensor outputs (e.g., pressure, temperature) in engine control units from load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and chassis ground to clamp ±33.2 V transients before reaching MCU ADC input or LIN transceiver. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V sensor interface ICs during ISO 7637-2 Pulse 5a events, extending system field life. |
Use Scenario: Safeguarding programmable logic controller (PLC) digital input channels connected to 24 V DC field wiring exposed to relay coil kickback. IC Role / Device Role / Timing Role: Parallel-connected TVS shunting inductive energy away from optocoupler input stage during contactor de-energization. Use Value: Limits voltage excursion to 33.2 V, enabling use of cost-effective 36 V-rated optocouplers instead of higher-voltage alternatives. |
| Telecom Interface Protection | Consumer USB/Display Port ESD |
Use Scenario: Shielding RS-485 transceivers in base station backhaul equipment from lightning-induced common-mode surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Bidirectional TVS installed across differential pair (A/B) and ground to suppress ±33.2 V common-mode spikes without distorting data integrity. Use Value: Maintains signal fidelity up to 10 Mbps while passing IEC 61000-4-5 Level 4 (4 kV) surge testing without degradation. |
Use Scenario: Adding secondary surge protection on HDMI or USB Type-C port VBUS and CC lines in smart displays and docking stations. IC Role / Device Role / Timing Role: Secondary clamping device downstream of primary ESD array, absorbing residual energy after initial ESD event. Use Value: Reduces risk of latent damage from repeated 8 kV HBM ESD events by limiting peak voltage to 33.2 V during 1500 W surge conditions. |
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 | Lower PPPM (600 W), smaller SMB package (DO-214AA), same VWM/VBR/VC ratings. | Limited to lower-energy transients (IEC 61000-4-5 Level 2); unsuitable for automotive load-dump scenarios requiring 1500 W. | Select when board space is constrained and surge threat level is moderate (e.g., consumer USB ports). |
| 1.5KE24CA | Through-hole TO-204AE (DO-201AE) package, identical electrical specs but larger footprint and manual assembly requirement. | Not suitable for fully automated SMT production; used only in legacy or high-reliability military/aerospace designs with through-hole preference. | Choose only if existing PCB layout mandates through-hole mounting or thermal mass requirements exceed SMC capabilities. |
Compared with SMBJ24CA and 1.5KE24CA, the 1.5SMC24CAHM3_A/I uniquely combines AEC-Q101 qualification, halogen-free compliance, 1500 W surge capacity, and SMC packaging - making it the only option qualified for volume automotive SMT production requiring full IEC 61000-4-5 Level 4 immunity.
Availability
1.5SMC24CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom interface surge suppression requiring stable component supply, long-term lifecycle support, and traceable AEC-Q101-compliant sourcing.
Supply support for 1.5SMC24CAHM3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The 1.5SMC Series was developed for high-power, surface-mount transient suppression in automotive, industrial, and telecom systems - delivering standardized 1500 W surge capability in compact SMC packages with AEC-Q101 and RoHS compliance.
FAQ
What is the clamping voltage of the 1.5SMC24CAHM3_A/I under a 10/1000 μs surge?
The 1.5SMC24CAHM3_A/I has a maximum clamping voltage (VC) of 33.2 V at 45.2 A peak pulse current with a 10/1000 μs waveform. This value is measured per standard test conditions (TA = 25 °C, mounted on 8 mm × 8 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the 1.5SMC24CAHM3_A/I suitable for automotive applications?
Yes, the 1.5SMC24CAHM3_A/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials. Its construction includes glass-passivated junctions and MSL Level 1 handling, enabling use in engine control units, ADAS sensor interfaces, and body electronics where reliability under thermal cycling, vibration, and repetitive surge stress is mandatory - confirmed per Vishay's qualification report for the HM3 suffix.
How does the bidirectional design of the 1.5SMC24CAHM3_A/I affect its placement on the PCB?
The 1.5SMC24CAHM3_A/I has no polarity marking and functions identically in either orientation, simplifying layout and eliminating risk of reverse installation. This bidirectional behavior allows direct placement across differential signal pairs (e.g., CAN_H/CAN_L) or between any two nodes requiring symmetrical overvoltage protection - unlike unidirectional TVS diodes that require strict cathode/anode alignment.
What is the thermal resistance of the 1.5SMC24CAHM3_A/I, and how does it impact PCB layout?
The 1.5SMC24CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended 8 mm × 8 mm copper pads per terminal. To maintain safe junction temperatures under sustained power dissipation, designers must provide adequate copper area and avoid excessive trace length - especially important in automotive applications where ambient temperatures exceed 85 °C.
Does the 1.5SMC24CAHM3_A/I meet industry surge immunity standards?
Yes, the 1.5SMC24CAHM3_A/I supports compliance with IEC 61000-4-5 (surge immunity) Level 4 (4 kV line-to-earth, 2 kV line-to-line) due to its 1500 W peak pulse power rating and 33.2 V clamping voltage. It is also validated for ISO 7637-2 Pulse 5a (load dump) in automotive applications - verified through Vishay's AEC-Q101 stress testing and published in Document Number 88303.
1.5SMC24CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC, 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):
- 45.2A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
1.5SMC24CAHM3_A/I FAQ
1.How can I place an order for 1.5SMC24CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC24CAHM3_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 1.5SMC24CAHM3_A/I reliable?
The price and inventory of 1.5SMC24CAHM3_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 1.5SMC24CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC24CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC24CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC24CAHM3_A/I?
1.5SMC24CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC24CAHM3_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 1.5SMC24CAHM3_A/I?
For technical support, including 1.5SMC24CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC24CAHM3_A/I requirements.
6.How does Aetrix verify that 1.5SMC24CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC24CAHM3_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 1.5SMC24CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC24CAHM3_A/I?
All 1.5SMC24CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC24CAHM3_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 1.5SMC24CAHM3_A/I part is unused and in its original packaging.
Return procedure for 1.5SMC24CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC24CAHM3_A/I Tags
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