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STMicroelectronics SMCJ33A-TR
- Part No.:
- SMCJ33A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33A-TR.pdf
- Description:
- TVS DIODE 33VWM 69.7VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,643
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Product details
Overview
SMCJ33A-TR from STMicroelectronics is a unidirectional 1500 W transient voltage suppression (TVS) diode in SMC package, designed for primary-level surge protection of DC power rails and signal lines. It features a 33 V standoff voltage (VRM), 36.7–38.6 V breakdown voltage at 1 mA, 53.3 V clamping voltage at 29 A (10/1000 µs), and operates up to 150 °C junction temperature - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMCJ33A-TR datasheet, SMCJ33A-TR pinout, SMCJ33A-TR application, or SMCJ33A-TR equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, peak pulse current handling under IEC 61000-4-4 level 4 (4 kV), leakage current stability at elevated temperature, and thermal resistance on standard FR4 PCB footprints.
Technical Context
This TVS diode uses planar silicon junction technology optimized for low leakage (≤0.2 µA at 25 °C) and stable VBR drift (αT = 100 ppm/°C). Its dynamic resistance (RD = 0.44 Ω) ensures predictable clamping behavior across surge durations from 10 µs to 1000 µs.
The device complies with IEC 61000-4-2 (±30 kV air/contact discharge) and IEC 61000-4-4 level 4 (4 kV), with peak pulse power derating to 1250 W at Tj = 150 °C - enabling robust protection in thermally constrained environments without active cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 33 V - maximum continuous reverse operating voltage before significant leakage onset. |
| Breakdown Voltage (VBR) | 36.7–38.6 V at 1 mA - defines precise conduction threshold for ESD and surge events. |
| Clamping Voltage (VCL) | 53.3 V at 29 A (10/1000 µs) - limits transient voltage seen by downstream circuitry. |
| Peak Pulse Power (PPP) | 1500 W (10/1000 µs) - sustains single high-energy surges without failure. |
| Leakage Current (IRM) | ≤0.2 µA at VRM and 25 °C - minimizes standby power loss in battery-powered systems. |
| Junction Temperature Range | −55 to +150 °C - supports operation in under-hood automotive and industrial ambient conditions. |
| Package | SMC (DO-214AB) - JEDEC-registered surface-mount outline with 7.75–8.15 mm body width and 5.55–6.25 mm length. |
Pinout & Package
SMCJ33A-TR is a two-terminal unidirectional TVS diode in SMC (DO-214AB) package. Cathode is marked by a band on the body; anode is unmarked. The device mounts horizontally with leads extending from opposite ends of the molded epoxy body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes conduction loop during reverse-biased transients. |
| Cathode | High-side connection point | Connected to protected line (e.g., 33 V rail); initiates avalanche breakdown when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | ±30 kV contact/air discharge - exceeds Level 4, eliminating need for secondary ESD stages in many designs. |
| Low-temperature coefficient | αT = 100 ppm/°C - ensures <1% VBR shift over −40 to +125 °C operating range. |
| High-temperature surge capability | 1250 W (10/1000 µs) at Tj = 150 °C - maintains protection integrity in thermally stressed PCB layouts. |
| UL94 V0 flammability rating | Epoxy housing self-extinguishes within 10 s after flame removal - meets safety requirements for enclosed power systems. |
| JEDEC-compliant footprint | IPC7531-recommended pad layout - ensures manufacturability and thermal reliability on standard FR4 boards. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus Line Protection |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary surge clamp placed upstream of DC-DC converter input capacitor to limit transient voltage to ≤55 V. Use Value: Clamps 10/1000 µs surges up to 29 A while maintaining <0.2 µA leakage at 25 °C - preserving efficiency and preventing false trips. |
Use Scenario: 12 V power rail feeding CAN transceiver in BCM, subject to ESD and coupled transients from nearby solenoid switching. IC Role / Device Role / Timing Role: Unidirectional TVS on VCC line to absorb fast-rising ESD events before they reach transceiver's internal LDO. Use Value: 53.3 V clamping at 29 A ensures transceiver remains below its absolute maximum 58 V rating during 4 kV IEC 61000-4-4 surges. |
| Telecom Remote Radio Unit (RRU) DC Feeder Protection | Smart Meter AC/DC Auxiliary Supply Protection |
Use Scenario: −48 V DC feeder line entering outdoor RRU enclosure, vulnerable to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: First-line protection before bulk capacitance and hot-swap controller, rated for repeated 10/1000 µs events. Use Value: 1500 W peak power rating and 0.44 Ω dynamic resistance enable consistent clamping performance across multiple surge events without parameter drift. |
Use Scenario: 5 V auxiliary rail derived from AC/DC converter in smart meter, requiring fail-safe protection against mains-borne transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on post-regulator output to prevent latch-up in metrology SoC during conducted surges. Use Value: 33 V VRM provides 10% margin above nominal 30 V auxiliary rail, while 150 °C max Tj supports sealed, convection-limited enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A-TR | Same VRWM/VBR, but 600 W PPP rating and SMB package (smaller thermal mass). | Limited to lower-energy surges (e.g., board-level ESD only); unsuitable for 4 kV IEC 61000-4-4 line surges. | Select when space-constrained and surge energy is <600 W; verify thermal derating on 2-layer PCB. |
| 1.5KE33A | Through-hole DO-201 package, identical electrical specs but higher Rth(j-a) (60 °C/W vs. 45 °C/W for SMCJ). | Requires larger PCB area and manual assembly; less suitable for automated SMT production. | Choose only for legacy through-hole designs or where reflow compatibility is not required. |
Compared with SMBJ33A-TR and 1.5KE33A, SMCJ33A-TR delivers optimal balance of high-power surge handling (1500 W), SMT manufacturability, and thermal performance on standard FR4 - making it preferred for new industrial and automotive designs requiring IEC 61000-4-4 compliance.
Availability
SMCJ33A-TR is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom remote radio units, and smart meter auxiliary supplies requiring stable component supply and full IEC 61000-4-2/4-4 compliance.
Supply support for SMCJ33A-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.
SMCJ series belongs to ST's high-reliability TVS portfolio, engineered specifically for primary-level surge protection in harsh-environment applications where long-term leakage stability and high-temperature surge endurance are critical.
FAQ
What is the maximum clamping voltage of SMCJ33A-TR under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 53.3 V at 29 A for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases linearly with junction temperature at 100 ppm/°C, reaching ~54.1 V at Tj = 125 °C per the αT coefficient specified in DS1284 Rev 11.
Can SMCJ33A-TR be used for bidirectional signal line protection?
No - SMCJ33A-TR is unidirectional and conducts only during reverse-biased transients. For bidirectional protection (e.g., RS-485, USB D+/D−), the SMCJ33CA variant must be used, which has symmetrical breakdown in both polarities and identical clamping performance.
What is the recommended PCB footprint for thermal reliability?
ST specifies an IPC7531-compliant footprint with 3.14 mm pad width, 8.19 mm pad length, and 5.11 mm center-to-center spacing. Copper area ≥2.5 cm² per lead reduces Rth(j-a) to ≤45 °C/W, critical for sustaining 1250 W surges at 150 °C Tj.
Does SMCJ33A-TR meet automotive AEC-Q200 stress testing requirements?
No - SMCJ33A-TR is not AEC-Q200 qualified. While it operates up to 150 °C and passes IEC 61000-4-2/4-4, ST does not list it in their AEC-Q200 qualified TVS portfolio. For automotive-critical applications, consider the AEC-Q200-qualified SMAJ33A or SMF33A series instead.
SMCJ33A-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ, TRANSIL™
- 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:
- 69.7V
- Current - Peak Pulse (10/1000µs):
- 143A (8/20µs)
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SMCJ33A-TR FAQ
1.How can I place an order for SMCJ33A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33A-TR 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 SMCJ33A-TR reliable?
The price and inventory of SMCJ33A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33A-TR is usually 5 days.
3.What payment methods are accepted for SMCJ33A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33A-TR?
SMCJ33A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33A-TR 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 SMCJ33A-TR?
For technical support, including SMCJ33A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33A-TR requirements.
6.How does Aetrix verify that SMCJ33A-TR is sourced from the original manufacturer or authorized distributors?
All SMCJ33A-TR 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 SMCJ33A-TR meets industry standards.
7.What is the process for return or replacement of SMCJ33A-TR?
All SMCJ33A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33A-TR, 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 SMCJ33A-TR part is unused and in its original packaging.
Return procedure for SMCJ33A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33A-TR Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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