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Vishay General Semiconductor - Diodes Division 1.5SMC24CAHM3/H
- Part No.:
- 1.5SMC24CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC24CAHM3/H.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,060
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Product details
Overview
1.5SMC24CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal 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 (VC) at 45.2 A peak pulse current, and 1500 W peak pulse power capability with a 10/1000 µs waveform - deployed in automotive sensor interfaces, industrial I/O protection, and telecom line surge suppression.
For engineers reviewing the 1.5SMC24CAHM3/H datasheet, 1.5SMC24CAHM3/H pinout, 1.5SMC24CAHM3/H application, or 1.5SMC24CAHM3/H equivalent, key selection considerations include its bidirectional polarity, AEC-Q101 qualification, halogen-free RoHS-compliant HM3 suffix, SMC (DO-214AB) package thermal performance, and clamping behavior under repetitive lightning-surge transients.
Technical Context
This device operates as a voltage-clamped shunt protector: during transient overvoltage events exceeding VBR, it avalanches to divert surge current away from downstream circuitry while maintaining VC ≤ 33.2 V. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at 20.5 V).
Designed for high-reliability environments, the 1.5SMC24CAHM3/H meets MSL Level 1 per J-STD-020, supports 260 °C lead-free reflow, and delivers 1500 W peak pulse power with 0.01% duty cycle - enabled by low incremental surge resistance and fast sub-nanosecond response time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 24 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown) | 26.7–29.5 V at 1 mA - Verified avalanche onset range; ensures predictable turn-on during transients without premature conduction. |
| VC (Clamping) | 33.2 V at 45.2 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; enables IC-level protection down to 3.3 V/5 V rails. |
| PPPM | 1500 W - Sustained peak pulse power handling under standardized surge waveform; validates suitability for IEC 61000-4-5 Level 4 compliance. |
| TJ max | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive and industrial ambient conditions. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; optimized for automated placement and thermal dissipation on 8 mm × 8 mm copper pads. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; designated by HM3 suffix and "_H" reel code. |
Pinout & Package
SMC (DO-214AB) package: bidirectional device with no polarity marking; symmetrical terminals - both leads function identically as interchangeable anode/cathode connections in AC-coupled or differential signal paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient current path | Both terminals conduct equally in either direction during overvoltage events; no orientation required during PCB placement. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC lines, differential buses (e.g., RS-485, CAN), and floating sensor outputs without polarity constraints. |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges up to 4 kV/2 Ω without degradation when mounted per recommended pad layout. |
| AEC-Q101 qualified (HM3) | Validated for automotive applications including engine control modules, ADAS camera links, and body electronics with extended lifetime requirements. |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for industrial and consumer equipment; matte tin-plated leads ensure solderability per J-STD-002. |
| Low clamping ratio (VC/VBR ≈ 1.17) | Minimizes let-through voltage stress on protected ICs - critical for safeguarding 3.3 V microcontrollers and analog front-ends. |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting ABS wheel speed sensors and HVAC pressure transducers from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt TVS placed across sensor supply and ground pins to clamp transients before they reach ASIC or signal conditioner. Use Value: Prevents latch-up or permanent damage in 5 V sensor ICs during 12 V system load-dump events (up to +60 V, 400 ms), leveraging 24 V VWM margin and 33.2 V clamping. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers (e.g., SN65HVD230) against ESD and lightning-induced surges on field wiring. IC Role / Device Role / Timing Role: Bidirectional TVS connected between A/B differential lines and ground to suppress common-mode transients without distorting data integrity. Use Value: Maintains signal fidelity up to 10 Mbps while limiting surge-induced common-mode voltage to <33.2 V - well below transceiver absolute maximum ratings. |
| Telecom Line Card Surge | Consumer Power Adapter Input |
Use Scenario: Front-end protection on DSL or POTS line cards exposed to induced lightning surges per ITU-T K.20/K.44. IC Role / Device Role / Timing Role: Primary shunt protector on tip/ring lines before transformer coupling and line driver ICs. Use Value: Absorbs 1500 W peak energy from 10/1000 µs surges while holding clamping voltage below 33.2 V - preserving transformer insulation and driver FETs. |
Use Scenario: Secondary-side overvoltage clamp on 24 V DC output rails of wall-mounted AC/DC adapters used in smart home hubs. IC Role / Device Role / Timing Role: Fast-response TVS placed across output capacitor to suppress switching noise spikes and external fault transients. Use Value: Limits output rail overshoot to ≤33.2 V during 100 ns–1 µs transients, preventing brownout resets or damage to 3.3 V/5 V PMICs downstream. |
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 peak pulse power (600 W), smaller SMB (DO-214AA) package, higher RθJA (100 °C/W). | Suitable for space-constrained consumer designs with lower surge threat levels (IEC 61000-4-2 only); not rated for IEC 61000-4-5 Level 4. | Select SMBJ24CA only when board area is critical and surge energy is limited to ≤600 W. |
| 1.5KE24CA | Through-hole DO-201AE package, identical electrical specs but incompatible with SMT assembly; higher thermal resistance. | Used in legacy industrial power supplies where manual assembly or high-volume through-hole production remains standard. | Choose 1.5KE24CA only for retrofit or cost-sensitive through-hole designs - not for new SMT-based automotive or telecom platforms. |
Compared with SMBJ24CA and 1.5KE24CA, the 1.5SMC24CAHM3/H delivers superior surge robustness (1500 W vs. 600 W or through-hole-limited thermal performance) in a compact, AEC-Q101-qualified SMT package - making it the preferred choice for next-generation automotive, industrial, and telecom edge devices requiring validated reliability and automated manufacturability.
Availability
1.5SMC24CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial communication interfaces, and telecom line card designs requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant surge protection.
Supply support for 1.5SMC24CAHM3/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 1.5SMC Series targets high-energy transient suppression in automotive, industrial, and telecom systems - engineered for AEC-Q101 compliance, halogen-free construction, and consistent clamping performance across temperature and surge repetition rates.
FAQ
What does the "HM3/H" suffix mean in 1.5SMC24CAHM3/H?
The "HM3" suffix indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification; the trailing "/H" denotes packaging in 7-inch plastic tape-and-reel format (850 units per reel). This distinguishes 1.5SMC24CAHM3/H from commercial-grade E3/M3 variants and non-automotive HE3/HM3 versions lacking full AEC-Q101 validation.
Is 1.5SMC24CAHM3/H unidirectional or bidirectional?
The "CA" in 1.5SMC24CAHM3/H explicitly designates a bidirectional configuration - meaning it provides symmetrical clamping in both polarities, with no cathode band marking and identical VBR, VC, and IPPM characteristics for positive and negative transients. This makes 1.5SMC24CAHM3/H ideal for AC-coupled or differential signal protection.
What is the maximum clamping voltage of 1.5SMC24CAHM3/H at rated surge current?
The maximum clamping voltage (VC) of 1.5SMC24CAHM3/H is 33.2 V, measured at 45.2 A peak pulse current using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range (−65 °C to +150 °C) and defines the upper voltage limit imposed on protected circuitry during surge events.
Can 1.5SMC24CAHM3/H replace older 1.5SMC24CA-E3 parts in existing designs?
Yes - 1.5SMC24CAHM3/H is a direct drop-in replacement for 1.5SMC24CA-E3 in terms of electrical specs, package dimensions, and soldering profile. However, 1.5SMC24CAHM3/H adds AEC-Q101 qualification and halogen-free materials, making it suitable for automotive use cases where the E3 variant is restricted to commercial applications.
What PCB pad layout is recommended for optimal thermal performance of 1.5SMC24CAHM3/H?
Vishay specifies mounting 1.5SMC24CAHM3/H on 0.31″ × 0.31″ (8.0 mm × 8.0 mm) copper pads per terminal to achieve rated 1500 W pulse power. Smaller pads reduce heat dissipation and derate peak power significantly; the SMC (DO-214AB) outline drawing confirms 7.75 mm × 6.22 mm body with 2.62 mm max height and 0.103″ lead spacing.
1.5SMC24CAHM3/H 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:
- 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):
- 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/H FAQ
1.How can I place an order for 1.5SMC24CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC24CAHM3/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 1.5SMC24CAHM3/H reliable?
The price and inventory of 1.5SMC24CAHM3/H 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/H is usually 5 days.
3.What payment methods are accepted for 1.5SMC24CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC24CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC24CAHM3/H?
1.5SMC24CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC24CAHM3/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 1.5SMC24CAHM3/H?
For technical support, including 1.5SMC24CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC24CAHM3/H requirements.
6.How does Aetrix verify that 1.5SMC24CAHM3/H is sourced from the original manufacturer or authorized distributors?
All 1.5SMC24CAHM3/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 1.5SMC24CAHM3/H meets industry standards.
7.What is the process for return or replacement of 1.5SMC24CAHM3/H?
All 1.5SMC24CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC24CAHM3/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 1.5SMC24CAHM3/H part is unused and in its original packaging.
Return procedure for 1.5SMC24CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC24CAHM3/H Tags
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