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Microchip Technology SMAJ33CE3/TR13
- Part No.:
- SMAJ33CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33CE3/TR13.pdf
- Description:
- TVS DIODE 33VWM 59VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,008
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Product details
Overview
SMAJ33CE3/TR13 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for robust ESD, EFT, and secondary lightning surge protection in DC power rails and signal lines. It features a 33 V standoff voltage (VWM), 36.7 V minimum breakdown voltage (VBR), 59.0 V clamping voltage (VC) at 8.5 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform - deployed in telecom power supplies and industrial I/O interfaces.
For engineers reviewing the SMAJ33CE3/TR13 datasheet, SMAJ33CE3/TR13 pinout, SMAJ33CE3/TR13 application, or SMAJ33CE3/TR13 equivalent, key selection criteria include bidirectional clamping symmetry, RoHS-compliant matte-tin plating, DO-214AC package compatibility, IEC61000-4-2/4-4/4-5 compliance, and tape-and-reel packaging for automated SMT assembly.
Technical Context
This bidirectional TVS operates with symmetrical reverse standoff (33 V) and breakdown (≥36.7 V @ 1 mA) in both polarities, enabling protection of AC-coupled or floating signal paths without polarity dependency. Its <100 ps theoretical response time ensures suppression before sensitive downstream ICs experience overstress.
The device delivers 500 W peak pulse power handling at 25 °C with derating to 1.56 W steady-state dissipation at 25 °C ambient, supported by low thermal resistance (80 °C/W junction-to-ambient on FR4 with recommended footprint). Clamping occurs at 59.0 V under 8.5 A 10/1000 µs surge, limiting transient energy delivered to protected circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; sets upper limit for protected line nominal voltage. |
| VBR min | 36.7 V @ 1 mA - Minimum voltage at which device enters avalanche conduction; ensures reliable triggering above normal operating transients. |
| VC @ IPP | 59.0 V @ 8.5 A - Maximum clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by downstream components. |
| PPP | 500 W - Peak pulse power capability per standard 10/1000 µs waveform; enables protection against high-energy surges like IEC61000-4-5 Class 3 (42 Ω source). |
| IPP | 8.5 A - Peak pulse current corresponding to VC = 59.0 V; used to size series impedance and verify coordination with upstream fusing. |
| Leakage ID | 1 µA @ 33 V - Reverse standby current at rated standoff; negligible loading on 33 V supply rails or high-impedance signal paths. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with 2.57–2.79 mm body width and 4.93–5.48 mm length; compatible with JEDEC MS-013 footprints. |
Pinout & Package
DO-214AC (SMA) package: molded thermosetting epoxy case, void-free, UL94V-0 rated; C-bend (modified J-bend) leads with RoHS-compliant annealed matte-tin plating; cathode band omitted on bidirectional devices (SMAJxxC/CA series).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction | No polarity marking; terminals interchangeable - provides identical clamping in either direction for AC or floating circuits. |
| Case / Body | Thermal and mechanical interface | Non-conductive epoxy body; heat dissipation relies on copper pad area and trace width per recommended footprint (Page 5). |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VWM, VBR, and VC in both directions - eliminates need for polarity-aware layout in differential or AC-coupled interfaces. |
| IEC61000-4-5 compliance | Validated for secondary lightning protection up to Class 3 (42 Ω source) and Class 2 (12 Ω source) - meets industrial port immunity requirements. |
| RoHS-compliant "e3" suffix | Matte-tin plating per J-STD-020B Level 1 moisture sensitivity - supports lead-free reflow without dry pack or baking. |
| 500 W peak pulse rating | Handles 8.5 A 10/1000 µs surge at 59.0 V clamp - sufficient for telecom power input stages and PLC analog I/O protection. |
| Tape-and-reel packaging | TR13 designation indicates 2500 units per 13-inch reel per EIA-481-1-A - optimized for high-volume SMT placement. |
Applications
| Industrial PLC Analog Inputs | Telecom DC Power Input |
|---|---|
Use Scenario: Protection of 4–20 mA current loop inputs against induced surges from nearby motor switching or lightning coupling. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to clamp common-mode transients before precision op-amps or ADC front-ends. Use Value: Limits transient overvoltage to ≤59.0 V, preventing latch-up or damage to 36 V-rated input amplifiers while maintaining <1 µA leakage at 24 V nominal rail. |
Use Scenario: Secondary surge protection on -48 V telecom power distribution boards exposed to lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Parallel-connected TVS on DC input bus to absorb 500 W surges per IEC61000-4-5 Class 3 (42 Ω source). Use Value: Clamps 8.5 A surge to 59.0 V within <5 ns, coordinating with upstream MOVs to divert >90% of surge energy before reaching DC/DC converters. |
| Automotive Body Control Module (BCM) Sensors | RS-485 Communication Lines |
Use Scenario: Protection of LIN or CAN sensor inputs (e.g., temperature, door switch) against battery dump and load dump transients. IC Role / Device Role / Timing Role: Bidirectional TVS across sensor signal and ground to suppress ±100 V transients without polarity constraints. Use Value: Withstands 33 V standoff and clamps to 59.0 V, ensuring compatibility with 5 V or 12 V sensor supply domains while surviving ISO 7637-2 Pulse 1/2a/3a. |
Use Scenario: Common-mode surge suppression on RS-485 twisted-pair data lines in factory automation networks. IC Role / Device Role / Timing Role: TVS connected between A/B lines and ground to shunt differential and common-mode transients simultaneously. Use Value: Symmetrical 33 V standoff allows use on balanced differential pairs; 59.0 V clamp preserves receiver common-mode range (±7 V) during 1 kV EFT bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CAHE3/TR13 (Microchip) | Same VWM (33 V), VBR (≥36.7 V), VC (59.0 V), and DO-214AC package; manufactured post-Microsemi acquisition by Microchip. | Identical electrical specs and qualification; same tape-and-reel packaging (TR13); fully aligned with legacy Microsemi design intent. | Select when requiring continuity of supply under Microchip's extended product stewardship and updated quality documentation. |
| SMBJ33CA (Littelfuse) | Same VWM (33 V), VBR (≥36.7 V), VC (59.0 V), but SMB package (DO-214AA) - 3.56 mm width vs. SMAJ's 2.79 mm max width. | Larger footprint requires PCB layout revision; otherwise functionally interchangeable for 500 W bidirectional clamping in space-tolerant designs. | Choose only if board real estate permits wider pad layout and thermal mass benefits of SMB package are prioritized over SMA density. |
Compared with SMAJ33CE3/TR13, SMAJ33CAHE3/TR13 offers seamless second-source continuity under Microchip ownership, while SMBJ33CA demands PCB footprint adaptation despite matching electrical performance - making the former preferred for drop-in replacement and the latter suitable only for new designs accepting larger package size.
Availability
SMAJ33CE3/TR13 is available at Aetrix Electronics and suitable for industrial PLC analog inputs, telecom DC power inputs, automotive BCM sensors, and RS-485 communication lines requiring stable component supply across multi-year production cycles.
Supply support for SMAJ33CE3/TR13 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and discrete components for aerospace, defense, and industrial markets.
The SMAJ series was engineered specifically for surface-mount transient suppression in harsh environments - delivering 500 W surge capability in compact DO-214AC packages for telecom infrastructure, industrial control, and automotive electronics.
FAQ
What does the 'C' suffix in SMAJ33CE3/TR13 indicate?
The 'C' suffix denotes bidirectional construction: SMAJ33CE3/TR13 provides symmetrical clamping in both polarities, with identical VWM (33 V), VBR (≥36.7 V), and VC (59.0 V) characteristics regardless of voltage polarity. This eliminates the need for polarity-aware placement on AC-coupled or floating signal lines, unlike unidirectional variants (e.g., SMAJ33A) that require correct anode/cathode orientation. The SMAJ33CE3/TR13 datasheet confirms this behavior in its electrical characteristics table and symbol definitions.
Is SMAJ33CE3/TR13 compliant with IEC61000-4-5 for lightning surge protection?
Yes, SMAJ33CE3/TR13 is validated for secondary lightning protection per IEC61000-4-5 with both 42 Ω and 12 Ω source impedances. Specifically, it meets Class 3 (42 Ω) and Class 2 (12 Ω) requirements, supporting peak pulse currents up to 8.5 A at 59.0 V clamping. This capability is documented in the "APPLICATIONS / BENEFITS" section of the Microsemi datasheet (MSC0270A, Rev L), where SMAJ33CA is explicitly listed in the Class 3 and Class 2 coverage tables - confirming SMAJ33CE3/TR13's suitability for industrial port-level surge immunity.
What is the maximum steady-state power dissipation of SMAJ33CE3/TR13 at room temperature?
SMAJ33CE3/TR13 has a steady-state power dissipation rating of 1.56 W at 25 °C ambient temperature when mounted on an FR4 printed circuit board with 1 oz copper and the recommended footprint (per datasheet Page 5). This value derives from its thermal resistance of 80 °C/W junction-to-ambient and maximum junction temperature of +150 °C. At higher ambient temperatures, derating applies per the "Derating Curve" in Figure 3 of the datasheet - for example, dissipation drops to ~1.0 W at 50 °C ambient.
Does SMAJ33CE3/TR13 require special handling for moisture sensitivity?
No, SMAJ33CE3/TR13 has a moisture sensitivity level (MSL) of Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored indefinitely at ≤30 °C/85% RH without dry packing or baking prior to reflow. Its RoHS-compliant "e3" suffix confirms matte-tin plating qualified for lead-free soldering at 260 °C for 10 seconds maximum - eliminating moisture-related popcorning risks during standard SMT assembly. This is explicitly stated in the "FEATURES" section of the Microsemi datasheet.
How does the clamping voltage of SMAJ33CE3/TR13 compare to its breakdown voltage?
SMAJ33CE3/TR13 has a minimum breakdown voltage (VBR) of 36.7 V at 1 mA test current and a maximum clamping voltage (VC) of 59.0 V at 8.5 A peak pulse current (10/1000 µs). The 22.3 V difference represents the dynamic voltage rise under surge conditions - a critical design margin that ensures the device transitions rapidly from high-impedance standby to low-impedance conduction without overshoot. This VC–VBR spread is typical for 500 W SMAJ-series TVS diodes and is verified in Figure 2 of the datasheet.
SMAJ33CE3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 59V
- Current - Peak Pulse (10/1000µs):
- 8.5A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ33CE3/TR13 FAQ
1.How can I place an order for SMAJ33CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33CE3/TR13 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 SMAJ33CE3/TR13 reliable?
The price and inventory of SMAJ33CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ33CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33CE3/TR13?
SMAJ33CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33CE3/TR13 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 SMAJ33CE3/TR13?
For technical support, including SMAJ33CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ33CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ33CE3/TR13 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 SMAJ33CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ33CE3/TR13?
All SMAJ33CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33CE3/TR13, 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 SMAJ33CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ33CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33CE3/TR13 Tags
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