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Vishay General Semiconductor - Diodes Division SMCJ33AHE3_A/H
- Part No.:
- SMCJ33AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33AHE3_A/H.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ33AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 33 V standoff voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V clamping voltage (VC) at 28.1 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive ECUs, industrial motor drives, and telecom power supplies.
For engineers reviewing the SMCJ33AHE3_A/H datasheet, SMCJ33AHE3_A/H pinout, SMCJ33AHE3_A/H application, or SMCJ33AHE3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 1500 W surge capability, low clamping ratio (VC/VBR ≈ 1.39), and compatibility with automated SMT assembly on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamping device triggered by transient overvoltages exceeding its reverse standoff threshold. Its glass-passivated junction ensures stable breakdown behavior and fast response (<1 ns), while the low incremental surge resistance enables effective energy diversion during ESD, lightning-induced surges, and inductive switching transients.
The device is rated for continuous operation from –55 °C to +150 °C junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards - confirming suitability for high-reliability automotive and industrial PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24 V systems. |
| VBR (min/max) | 36.7 V / 40.6 V at IT = 1 mA - verified breakdown range ensuring predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 53.3 V at 28.1 A (10/1000 µs) - clamping voltage limiting downstream IC stress during worst-case surge events. |
| PPPM | 1500 W - peak transient power handling capacity; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| ID @ VWM | 1.0 µA - ultra-low leakage at rated standoff, minimizing standby power loss in battery-backed or low-power circuits. |
| TJ max. | +150 °C - extended thermal rating enabling use in under-hood automotive environments and enclosed industrial enclosures. |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with cathode band marking. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); 0.305" × 0.246" × 0.103". Mounting requires 8.0 mm × 8.0 mm copper pads per terminal per Vishay recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or system return path; forms clamping loop with cathode during reverse transient. |
| Cathode | Protected line input | Marked with band; connects to protected line (e.g., 24 V rail or signal trace); conducts surge current to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional polarity with cathode band | Enables precise placement on DC rails where polarity-sensitive protection is required (e.g., 24 V supply inputs). |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress without parameter drift. |
| 1500 W peak pulse power (10/1000 µs) | Provides headroom for multi-pulse surge events in industrial motor controllers and automotive load-dump scenarios. |
| AEC-Q101 qualified (HE3 suffix) | Validates conformance to automotive stress tests including HTOL, TC, and ESD - required for Tier-1 ECU designs. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow without popcorn cracking or delamination in high-volume SMT production. |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive Control |
|---|---|
|
Use Scenario: Protecting 24 V supply inputs in engine control units (ECUs) against ISO 7637-2 load dump pulses up to 60 V/100 ms. IC Role / Device Role / Timing Role: Clamping diode placed between 24 V rail and chassis ground; activates within <1 ns to limit voltage seen by MCU and CAN transceivers. Use Value: Limits peak rail voltage to ≤53.3 V during 1500 W surge, preventing latch-up or permanent damage to downstream 3.3 V/5 V logic. |
Use Scenario: Safeguarding gate driver ICs and current-sense amplifiers in variable-frequency drives exposed to inductive kickback from IGBT switching. IC Role / Device Role / Timing Role: Parallel-connected TVS on isolated DC link sensing lines; clamps transients induced by dV/dt coupling or snubber failure. Use Value: Maintains signal integrity by holding sensed voltage below amplifier input absolute maximum rating (±36 V typical), avoiding offset drift or saturation. |
| Telecom DC Power Input | Consumer Appliance Mainboard |
|
Use Scenario: Surge suppression on 48 V PoE-powered equipment front-end, meeting IEC 61000-4-5 Level 4 (4 kV line-earth). IC Role / Device Role / Timing Role: First-line defense before DC-DC converter; absorbs bulk energy from lightning-induced surges on outdoor Ethernet cables. Use Value: Withstands 28.1 A peak current at 53.3 V clamp, reducing stress on downstream MOVs and enabling smaller, lower-cost secondary protection stages. |
Use Scenario: Overvoltage protection on microcontroller reset lines and USB VBUS traces in smart home hubs subjected to ESD per IEC 61000-4-2 (±8 kV contact). IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF typical) unidirectional clamp tied between signal line and ground; shunts ESD current away from sensitive I/O pins. Use Value: Delivers sub-1 ns response and <1 µA leakage at 33 V, preserving signal rise time and battery life in always-on IoT devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33AHE3/A | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 110 °C/W), same VWM/VBR/VC specs. | Better suited for space-constrained consumer boards with lower surge exposure; not rated for automotive load dump. | Select when board area is critical and surge threat level is limited to IEC 61000-4-2 ESD only. |
| SMCJ33CAHE3_A/H | Bidirectional variant; identical VWM/VBR/VC but symmetric clamping in both polarities; same AEC-Q101 qualification and SMC package. | Required for AC-coupled signal lines (e.g., RS-485, CAN FD) or floating DC buses where polarity reversal may occur. | Choose only if bidirectional protection is mandated by interface standard or circuit topology - otherwise unidirectional SMCJ33AHE3_A/H offers tighter leakage and simpler layout. |
Compared with SMAJ33AHE3/A and SMCJ33CAHE3_A/H, the SMCJ33AHE3_A/H delivers optimal balance of 1500 W surge capacity, automotive qualification, and unidirectional precision - making it the preferred choice for 24 V/48 V DC power rail protection where high-energy transients and long-term reliability are non-negotiable.
Availability
SMCJ33AHE3_A/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial motor drive development, and telecom power supply validation requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMCJ33AHE3_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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - emphasizing clamping accuracy, surge endurance, and AEC-Q101 compliance for mission-critical systems.
FAQ
What is the clamping voltage of the SMCJ33AHE3_A/H and how does it protect downstream components?
The SMCJ33AHE3_A/H has a maximum clamping voltage (VC) of 53.3 V at 28.1 A peak pulse current (10/1000 µs waveform). This value represents the highest voltage that will appear across the protected line during a surge event. By limiting transient voltage to ≤53.3 V, the SMCJ33AHE3_A/H ensures that downstream components - such as 3.3 V or 5 V MCUs, CAN transceivers, or gate drivers - remain within their absolute maximum voltage ratings, preventing latch-up, parametric shift, or catastrophic failure. The low clamping ratio (VC/VBR ≈ 1.39) reflects efficient energy absorption without excessive overshoot.
Is the SMCJ33AHE3_A/H suitable for automotive applications, and what qualifications does it hold?
Yes, the SMCJ33AHE3_A/H is explicitly qualified to AEC-Q101 for automotive use, as confirmed by its HE3 suffix and documentation in Vishay's 88394 datasheet. It undergoes rigorous stress testing including high-temperature operating life (HTOL), temperature cycling (TC), and ESD per AEC-Q101 Rev G. This qualification validates its suitability for under-hood and cabin ECU designs subject to load dump, jump-start, and cold-crank conditions - making the SMCJ33AHE3_A/H appropriate for 12 V/24 V vehicle power networks.
How does the SMCJ33AHE3_A/H differ from the bidirectional SMCJ33CAHE3_A/H variant?
The SMCJ33AHE3_A/H is unidirectional, with a marked cathode band indicating polarity-sensitive installation on DC rails. In contrast, the SMCJ33CAHE3_A/H is bidirectional, offering symmetrical clamping for AC signals or floating buses. Both share identical VWM (33 V), VBR (36.7–40.6 V), VC (53.3 V), and AEC-Q101 qualification, but the unidirectional SMCJ33AHE3_A/H exhibits lower reverse leakage (1.0 µA vs. 2.0 µA for CA version at VWM) and avoids unnecessary complexity in DC-only applications. Use SMCJ33AHE3_A/H unless your circuit requires dual-polarity protection.
What is the recommended PCB layout for optimal performance of the SMCJ33AHE3_A/H?
Vishay specifies mounting the SMCJ33AHE3_A/H on minimum 8.0 mm × 8.0 mm copper pads per terminal to achieve rated 1500 W surge capability. Short, wide traces must connect the cathode directly to the protected line and the anode to the lowest-impedance ground plane - avoiding vias or narrow necks that increase inductance and degrade clamping speed. Thermal relief should be minimized to ensure low RθJA (75 °C/W), and the device must be placed as close as possible to the connector or IC being protected to reduce parasitic inductance in the surge path.
Does the SMCJ33AHE3_A/H meet RoHS and halogen-free requirements?
Yes, the SMCJ33AHE3_A/H is RoHS-compliant and AEC-Q101 qualified, as indicated by the "HE3" suffix per Vishay's ordering nomenclature. It uses matte tin-plated leads and UL 94 V-0 molding compound. While it is RoHS-compliant, it is not halogen-free - that designation applies only to HM3-suffixed variants. For applications requiring halogen-free materials (e.g., certain aerospace or green-certified industrial products), the SMCJ33AHM3_A/H would be the appropriate alternative.
SMCJ33AHE3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ33AHE3_A/H FAQ
1.How can I place an order for SMCJ33AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33AHE3_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 SMCJ33AHE3_A/H reliable?
The price and inventory of SMCJ33AHE3_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 SMCJ33AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMCJ33AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33AHE3_A/H?
SMCJ33AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33AHE3_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 SMCJ33AHE3_A/H?
For technical support, including SMCJ33AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33AHE3_A/H requirements.
6.How does Aetrix verify that SMCJ33AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMCJ33AHE3_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 SMCJ33AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMCJ33AHE3_A/H?
All SMCJ33AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33AHE3_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 SMCJ33AHE3_A/H part is unused and in its original packaging.
Return procedure for SMCJ33AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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