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Vishay General Semiconductor - Diodes Division 1.5SMC39CAHM3/I
- Part No.:
- 1.5SMC39CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC39CAHM3/I.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,644
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Product details
Overview
1.5SMC39CAHM3/I 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 39 V standoff voltage (VWM), 43.3–47.8 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), and clamps transients to ≤53.9 V at 27.8 A - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the 1.5SMC39CAHM3/I datasheet, 1.5SMC39CAHM3/I pinout, 1.5SMC39CAHM3/I application, or 1.5SMC39CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, SMC (DO-214AB) package compatibility, and thermal resistance (RθJA = 75 °C/W) under PCB pad-constrained layouts.
Technical Context
This device operates as a voltage-clamped shunt protector: during transient events exceeding VWM (33.3 V), it avalanches symmetrically in both directions to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown and low leakage (<1 µA at VWM).
Designed for high-reliability environments, the 1.5SMC39CAHM3/I meets MSL Level 1 (reflow peak 260 °C), supports 200 A unidirectional surge (IFSM), and delivers consistent clamping performance across -65 °C to +150 °C operating junction temperature range - with no polarity marking required due to bidirectional symmetry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 33.3 V - maximum continuous reverse voltage before clamping initiates; defines safe operating window for protected circuit. |
| VBR (Breakdown) | 43.3–47.8 V at 1 mA - precise avalanche onset range ensuring predictable turn-on during transients. |
| VC (Clamping) | ≤53.9 V at IPPM = 27.8 A - limits voltage seen by downstream ICs during 10/1000 µs surge, protecting 3.3 V/5 V logic. |
| PPPM | 1500 W - peak transient energy absorption capacity per JEDEC standard, enabling lightning/ESD robustness. |
| RθJA | 75 °C/W - thermal resistance from junction to ambient on 8.0 mm × 8.0 mm copper pads; guides heatsinking requirements. |
| TJ max. | +150 °C - maximum junction temperature supporting operation in under-hood automotive and industrial enclosures. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated terminals. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); cathode band omitted for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Connects to protected line; conducts during positive or negative surges relative to cathode node. |
| Cathode | Transient return path (bidirectional) | Connects to reference plane (e.g., ground or rail); symmetrical conduction enables dual-polarity clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 1500 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) without degradation when mounted per recommended pad layout. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control units, ADAS sensors, and infotainment power rails. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ESD >15 kV contact discharge). |
| MSL Level 1 moisture sensitivity | Allows direct placement into reflow ovens without baking; compatible with standard SMT assembly processes. |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Module |
|---|---|
Use Scenario: Protecting CAN FD or LIN bus transceivers from load-dump and jump-start induced transients in vehicle body electronics. IC Role / Device Role / Timing Role: Bidirectional shunt TVS placed between signal line and chassis ground to clamp ±100 V spikes within 1 ns. Use Value: Prevents latch-up or permanent damage to transceiver ICs while maintaining signal integrity up to 5 Mbps. |
Use Scenario: Safeguarding 24 V DC digital input channels against field-wiring induced surges in factory automation controllers. IC Role / Device Role / Timing Role: Primary overvoltage clamp on terminal block inputs, coordinated with upstream fuses and filtering. Use Value: Enables >100,000 surge cycles without parameter drift, reducing field failure rates in harsh EMI environments. |
| Telecom Line Card Protection | Consumer Power Adapter Output |
Use Scenario: Secondary protection on POTS or xDSL line interface circuits exposed to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Fast-response clamp after gas discharge tube (GDT) primary stage, limiting let-through voltage to <60 V. Use Value: Meets GR-1089-CORE Level 3 immunity requirements with <100 ps response time and no follow-on current. |
Use Scenario: Output-side transient suppression on 12 V/19 V AC-DC adapters used in laptops and monitors. IC Role / Device Role / Timing Role: Final-stage TVS across output rails to absorb coupling noise from switching regulators and external cable discharges. Use Value: Eliminates system resets caused by 8 kV ESD events on USB-C or barrel-jack connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ39CA | Lower PPPM (600 W), same VWM/VBR range, SMB (DO-214AA) package - smaller footprint but higher RθJA (100 °C/W). | Preferred for space-constrained consumer PCBs where 600 W surge margin suffices; not AEC-Q101 qualified. | Select when board area is critical and automotive qualification is unnecessary. |
| 1.5KE39CA | Through-hole TO-218 package, identical electrical specs, higher IFSM (200 A), but incompatible with SMT assembly. | Used in legacy industrial power supplies requiring manual soldering or high-vibration mechanical retention. | Choose only if through-hole mounting is mandated and automated placement is unavailable. |
Compared with SMBJ39CA and 1.5KE39CA, the 1.5SMC39CAHM3/I uniquely combines AEC-Q101 qualification, 1500 W surge rating, and SMC package manufacturability - making it optimal for new automotive and industrial designs requiring zero rework risk and full process compliance.
Availability
1.5SMC39CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, and telecom line card surge suppression requiring stable component supply across multi-year production programs.
Supply support for 1.5SMC39CAHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The 1.5SMC Series targets high-energy transient suppression in automotive, industrial, and telecom systems - engineered for rapid response, repeatable clamping, and long-term stability under thermal and electrical stress.
FAQ
What does the "CA" suffix indicate in 1.5SMC39CAHM3/I?
The "CA" suffix in 1.5SMC39CAHM3/I denotes a bidirectional configuration, meaning the device provides symmetrical clamping for both positive and negative voltage transients. Unlike unidirectional variants (e.g., "A"), it has no polarity marking and is used where AC signals, floating references, or dual-polarity surges require protection without circuit redesign.
Is 1.5SMC39CAHM3/I suitable for automotive applications?
Yes - the "HM3" suffix confirms that 1.5SMC39CAHM3/I is halogen-free, RoHS-compliant, and AEC-Q101 qualified. It has passed stress tests including temperature cycling, high-temperature reverse bias, and ESD per automotive reliability standards, making it approved for use in engine control, ADAS, and body electronics.
What is the maximum clamping voltage of 1.5SMC39CAHM3/I at rated surge current?
The maximum clamping voltage (VC) of 1.5SMC39CAHM3/I is 53.9 V at 27.8 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is guaranteed per datasheet Table 1 and defines the upper voltage limit imposed on protected circuitry during worst-case surge conditions.
How does the SMC (DO-214AB) package of 1.5SMC39CAHM3/I compare to SMB (DO-214AA)?
The SMC package of 1.5SMC39CAHM3/I measures 7.75 mm × 6.22 mm × 2.62 mm - larger than SMB (4.57 mm × 3.94 mm × 2.31 mm) - enabling higher power dissipation (1500 W vs. 600 W) and lower thermal resistance (75 °C/W vs. 100 °C/W). Its size supports robust surge handling but requires more PCB area.
Can 1.5SMC39CAHM3/I be used in place of a unidirectional TVS like 1.5SMC39AHM3/I?
No - 1.5SMC39CAHM3/I is bidirectional and lacks polarity marking, while 1.5SMC39AHM3/I is unidirectional with a cathode band. Substituting them requires verifying circuit topology: bidirectional use is mandatory for AC lines or floating grounds; unidirectional is required for DC rail-to-ground protection where forward conduction must be blocked.
1.5SMC39CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 27.8A
- 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)
1.5SMC39CAHM3/I FAQ
1.How can I place an order for 1.5SMC39CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC39CAHM3/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 1.5SMC39CAHM3/I reliable?
The price and inventory of 1.5SMC39CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC39CAHM3/I is usually 5 days.
3.What payment methods are accepted for 1.5SMC39CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC39CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC39CAHM3/I?
1.5SMC39CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC39CAHM3/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 1.5SMC39CAHM3/I?
For technical support, including 1.5SMC39CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC39CAHM3/I requirements.
6.How does Aetrix verify that 1.5SMC39CAHM3/I is sourced from the original manufacturer or authorized distributors?
All 1.5SMC39CAHM3/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 1.5SMC39CAHM3/I meets industry standards.
7.What is the process for return or replacement of 1.5SMC39CAHM3/I?
All 1.5SMC39CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC39CAHM3/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 1.5SMC39CAHM3/I part is unused and in its original packaging.
Return procedure for 1.5SMC39CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC39CAHM3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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