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Vishay General Semiconductor - Diodes Division SMCJ33CAHM3/I
- Part No.:
- SMCJ33CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33CAHM3/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,535
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Product details
Overview
SMCJ33CAHM3/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 33 V standoff voltage (VWM), 53.3 V maximum clamping voltage (VC) at 28.1 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMCJ33CAHM3/I datasheet, SMCJ33CAHM3/I pinout, SMCJ33CAHM3/I application, or SMCJ33CAHM3/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, halogen-free RoHS compliance, and thermal performance under repetitive surge conditions per JESD22-B102 and J-STD-020 MSL level 1.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: during transients exceeding its breakdown voltage (VBR min = 36.7 V, max = 40.6 V at IT = 1 mA), it rapidly switches to low-impedance conduction, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ps).
Designed for bidirectional use, SMCJ33CAHM3/I delivers symmetrical clamping in both polarities without polarity marking - critical for AC-coupled data lines and floating bus systems. Its RθJA of 75 °C/W and TJ max of +150 °C support operation in high-ambient environments when mounted on 8.0 mm × 8.0 mm copper pads per Fig. 2 derating curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range. |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - Breakdown threshold range; ensures reliable turn-on above normal operating voltage with margin. |
| VC @ IPPM | 53.3 V at 28.1 A - Clamped voltage during 10/1000 μs surge; determines maximum stress imposed on protected ICs. |
| PPPM | 1500 W - Peak pulse power handling; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| ID @ VWM | ≤1.0 μA - Reverse leakage at standoff voltage; minimizes quiescent power loss in battery-powered systems. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive and industrial enclosures. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated placement. |
Pinout & Package
SMCJ33CAHM3/I uses the standard SMC (DO-214AB) package: two-terminal, unmarked bidirectional device with no anode/cathode designation. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, rated for MSL level 1 (peak reflow ≤260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Either terminal serves as input/output path; symmetric conduction enables AC line or differential pair protection without orientation constraints. |
| Terminal 2 | Anode / Cathode (bidirectional) | Paired terminal completing the bidirectional clamp path; requires equal PCB trace impedance to ground for balanced surge diversion. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power domains per stress test requirements. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and JEDEC J-STD-020; eliminates brominated flame retardants while maintaining UL 94 V-0 flammability rating. |
| Low incremental surge resistance | Enables tighter clamping (VC/VBR ratio ≈ 1.45) and higher energy absorption efficiency versus legacy TVS families. |
| Very fast response time | Sub-nanosecond switching ensures protection against ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4) events before IC damage occurs. |
| MSL level 1 rating | Allows unlimited floor life and single-reflow assembly without baking; reduces manufacturing overhead in high-volume SMT lines. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: 12 V battery-supplied engine control unit exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between VBAT and GND, clamping surges up to 1500 W before they reach MCU power pins. Use Value: Maintains system uptime by limiting rail voltage to ≤53.3 V during 100 ms transients, preventing brownout resets and latch-up in 3.3 V/5 V logic. |
Use Scenario: 4–20 mA current loop interface in factory automation PLC receiving signals from pressure/temperature transmitters. IC Role / Device Role / Timing Role: Bidirectional TVS across signal and return lines to absorb induced lightning-induced surges (IEC 61000-4-5) and EFT bursts. Use Value: Preserves analog accuracy by holding leakage <1.0 μA at 33 V, avoiding offset errors while surviving repeated 1 kV/500 A transients. |
| Telecom Ethernet PHY Port Protection | Consumer USB-C Power Delivery Line Guard |
Use Scenario: Gigabit Ethernet PHY with MDI-X interface subjected to cable discharge events and nearby RF coupling. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per differential pair) referenced to chassis ground, leveraging bidirectional symmetry. Use Value: Prevents PHY latch-up by clamping common-mode spikes to <53.3 V within <1 ns, meeting IEEE 802.3 compliance for EMC robustness. |
Use Scenario: USB-C port in portable monitor handling 20 V PD negotiation and hot-plug insertion surges. IC Role / Device Role / Timing Role: Bidirectional clamp on VBUS line upstream of buck converter, absorbing ±15 kV ESD (IEC 61000-4-2) and 10/1000 μs surges. Use Value: Enables single-device protection without polarity detection circuitry, reducing BOM count and layout area versus unidirectional solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA-E3/57T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), non-AEC-Q101. | Suitable only for low-energy consumer interfaces; insufficient for ISO 7637-2 Pulse 5a or IEC 61000-4-5 Level 4. | Select when space-constrained and surge threat level is limited to ESD/EFT only. |
| SMCJ33CAHE3_A/I | Same electrical specs and SMC package, but RoHS-compliant commercial grade (not halogen-free); lacks AEC-Q101 qualification. | Acceptable for industrial control panels but not automotive under-hood deployment per OEM requirements. | Choose for cost-sensitive non-automotive designs where halogen-free mandate does not apply. |
Compared with SMCJ33CAHM3/I, SMAJ33CA-E3/57T offers smaller size but significantly lower surge capacity and thermal robustness, while SMCJ33CAHE3_A/I matches form/fit/function but omits halogen-free and AEC-Q101 certifications required for Tier 1 automotive supply chains.
Availability
SMCJ33CAHM3/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom PHY port safeguarding requiring stable component supply across multi-year production cycles.
Supply support for SMCJ33CAHM3/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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial and automotive applications.
The SMCJ series was developed specifically for high-power transient suppression in harsh environments, emphasizing AEC-Q101 qualification, low clamping ratio, and MSL level 1 manufacturability - targeting next-generation vehicle electrification and Industry 4.0 infrastructure.
FAQ
What is the clamping voltage of SMCJ33CAHM3/I at its rated peak pulse current?
The SMCJ33CAHM3/I has a maximum clamping voltage (VC) of 53.3 V when subjected to its rated peak pulse current (IPPM) of 28.1 A using the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMCJ33CAHM3/I suitable for automotive applications?
Yes, SMCJ33CAHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It meets stress test requirements for temperature cycling, humidity bias, and mechanical shock - making it approved for use in engine control modules, body electronics, and ADAS sensor power domains per major Tier 1 specifications.
How does the bidirectional design of SMCJ33CAHM3/I affect PCB layout?
The bidirectional nature of SMCJ33CAHM3/I eliminates polarity marking and allows placement across AC-coupled or floating differential lines without orientation concerns. However, symmetric PCB trace routing to ground planes is essential to maintain balanced surge current division - unequal inductance can cause voltage imbalance and reduce effective clamping performance during fast transients.
What is the thermal resistance of SMCJ33CAHM3/I, and how does it impact power dissipation?
SMCJ33CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 8.0 mm × 8.0 mm copper pads. At 25 °C ambient, this limits continuous power dissipation (PD) to 6.5 W; derating applies above 50 °C ambient per Figure 2 - requiring thermal-aware layout for sustained surge duty cycles in enclosed enclosures.
Does SMCJ33CAHM3/I require special handling during reflow soldering?
No special handling is required: SMCJ33CAHM3/I is rated MSL level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C and unlimited floor life. It supports standard lead-free reflow profiles without pre-baking, simplifying integration into high-throughput SMT lines while maintaining solder joint integrity per JESD 22-B102 whisker testing.
SMCJ33CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 28.1A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ33CAHM3/I FAQ
1.How can I place an order for SMCJ33CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33CAHM3/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 SMCJ33CAHM3/I reliable?
The price and inventory of SMCJ33CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ33CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33CAHM3/I?
SMCJ33CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33CAHM3/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 SMCJ33CAHM3/I?
For technical support, including SMCJ33CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33CAHM3/I requirements.
6.How does Aetrix verify that SMCJ33CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ33CAHM3/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 SMCJ33CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ33CAHM3/I?
All SMCJ33CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33CAHM3/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 SMCJ33CAHM3/I part is unused and in its original packaging.
Return procedure for SMCJ33CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33CAHM3/I Tags
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