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Microchip Technology SMAJ33AE3/TR13
- Part No.:
- SMAJ33AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33AE3/TR13.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,352
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Product details
Overview
SMAJ33AE3/TR13 from Microsemi is a unidirectional surface-mount Transient Voltage Suppressor (TVS) designed for primary overvoltage protection of DC power rails and signal lines. It features a 33 V reverse standoff voltage (VWM), 36.7 V minimum breakdown voltage (VBR), 53.3 V maximum clamping voltage (VC) at 9.4 A peak pulse current, and 500 W peak pulse power rating per 10/1000 µs waveform - deployed in telecom power supplies, industrial I/O modules, and automotive body control units.
For engineers reviewing the SMAJ33AE3/TR13 datasheet, SMAJ33AE3/TR13 pinout, SMAJ33AE3/TR13 application, or SMAJ33AE3/TR13 equivalent, key selection criteria include clamping performance under IEC61000-4-5 secondary lightning surge (42 Ω source), low standby leakage (<1 µA at 33 V), RoHS-compliant matte-tin plating, and compatibility with automated SMT assembly using EIA-481-1-A tape-and-reel packaging.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its 36.7 V breakdown threshold (IBR = 1 mA). Its <100 ps theoretical response time enables effective suppression of ESD events per IEC61000-4-2 Level 4 (±15 kV contact) and EFT bursts per IEC61000-4-4.
Thermal design relies on low junction-to-lead thermal resistance (15 °C/W) and a DO-214AC (SMA) package mounted on FR4 with 1 oz Cu. It sustains 5 W steady-state dissipation at lead temperature (TL) of 75 °C, but derates linearly above 25 °C ambient per the published derating curve.
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 3.3 V–24 V systems. |
| VBR min @ IBR | 36.7 V @ 1 mA - Minimum voltage at which avalanche conduction initiates; ensures predictable turn-on across temperature and lot variation. |
| VC @ IPP | 53.3 V @ 9.4 A - Clamped voltage during 10/1000 µs surge; determines protected IC's maximum transient stress level. |
| PPP | 500 W - Peak pulse power handling capability; supports IEC61000-4-5 Class 4 (42 Ω source) surges up to 1.2 kV open-circuit. |
| ID @ VWM | <1 µA - Reverse leakage at rated standoff; avoids measurable power loss or false triggering in high-impedance sensing circuits. |
| TJ Range | −65 °C to +150 °C - Full operational junction temperature range; validated for under-hood automotive and industrial environments. |
| Package | DO-214AC (SMA) - Standard surface-mount outline with C-bend leads; compatible with JEDEC MS-013 and IPC-7351B footprint. |
Pinout & Package
DO-214AC (SMA) package with two terminals: anode and cathode. Cathode identified by molded band on body; no polarity marking on bidirectional variants (not applicable to SMAJ33AE3/TR13).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-impedance return path; carries full surge current to earth during clamping. |
| Cathode | Protected line terminal | Connected to the line being protected (e.g., 33 V rail); reverse-biased during normal operation and avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant matte-tin plating | Meets J-STD-020B Level 1 moisture sensitivity; eliminates dry-pack requirement and supports lead-free reflow up to 260 °C for 10 s. |
| 500 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC61000-4-5 secondary lightning surges (42 Ω source) without parallel staging. |
| <100 ps theoretical response time | Ensures clamping activation prior to damage onset in fast-edge transients like ESD and inductive switch-off spikes. |
| Unidirectional configuration | Provides asymmetric protection ideal for DC-powered interfaces where forward conduction must be blocked (e.g., CAN, RS-485 bias rails). |
| Tape-and-reel packaging (TR13) | 2500 units per 13-inch reel per EIA-481-1-A; optimized for high-speed pick-and-place placement in volume manufacturing. |
Applications
| Industrial PLC Analog Input Protection | Automotive Body Control Module Power Rail |
|---|---|
Use Scenario: Protecting 0–10 V analog input channels from induced transients on factory floor wiring. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input pin and ground to clamp negative-going surges while blocking forward conduction. Use Value: Limits voltage excursion to ≤53.3 V during 1 kV/500 A IEC61000-4-5 surge, preserving ADC front-end integrity without adding series impedance. |
Use Scenario: Safeguarding 33 V auxiliary supply rail feeding microcontrollers and LIN transceivers in door modules. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across rail and chassis ground to absorb load-dump and jump-start transients. Use Value: Withstands 500 W surges at −40 °C to +125 °C, meeting AEC-Q200 stress requirements for under-hood deployment. |
| Telecom DC Power Feeder Protection | Medical Diagnostic Equipment Signal Line Guarding |
Use Scenario: Secondary protection on −48 V telecom rectifier outputs exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Unidirectional TVS installed at equipment entry point to shunt surge energy before reaching DC-DC converters. Use Value: 53.3 V clamping ensures downstream 50 V-rated capacitors remain within 85 % derated voltage limit during surge events. |
Use Scenario: Shielding low-noise sensor amplifiers (e.g., EEG, ECG front-ends) from ESD coupling via patient cables. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS placed at connector interface to suppress ±15 kV contact ESD without DC offset error. Use Value: Sub-µA standby current prevents signal path loading; <100 ps response prevents amplifier saturation during ESD pulse edge. |
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/TR13 | Same electrical specs; enhanced reliability screening per MIL-PRF-19500 JANTX with HTRB, surge, and thermal cycling validation. | Required for aerospace avionics or military-grade designs needing extended qualification beyond commercial grade. | Select SMAJ33AHE3/TR13 only if JANTX-level screening documentation and traceability are mandated by program requirements. |
| SMBJ33A-E3/52 | Same VWM/VC, but SMB package (DO-214AA); 600 W PPP; higher thermal resistance (20 °C/W junction-to-lead). | Better suited for space-constrained layouts where lower profile is critical, but requires larger copper area for equivalent thermal performance. | Choose SMBJ33A-E3/52 when board height is constrained and PCB layout allows increased thermal pad area to compensate for reduced heat transfer efficiency. |
Compared with SMAJ33AE3/TR13, SMAJ33AHE3/TR13 adds qualification rigor without altering clamping behavior, while SMBJ33A-E3/52 trades package size for slightly higher surge capacity and relaxed thermal management - both require review of mechanical fit and qualification scope before substitution.
Availability
SMAJ33AE3/TR13 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and telecom infrastructure requiring stable component supply with full RoHS compliance and tape-and-reel delivery.
Supply support for SMAJ33AE3/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, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The SMAJ series was engineered for robust, surface-mount transient suppression in harsh environments - delivering consistent 500 W surge handling and low-leakage performance across extended temperature ranges.
FAQ
What is the clamping voltage of SMAJ33AE3/TR13 under a standard 10/1000 µs surge?
The SMAJ33AE3/TR13 exhibits a maximum clamping voltage (VC) of 53.3 V when subjected to a 10/1000 µs waveform at its rated peak pulse current of 9.4 A. This value is measured per Figure 2 in the official Microsemi datasheet MSC0270A and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ33AE3/TR13 maintains this clamping performance across its full operating temperature range.
Is SMAJ33AE3/TR13 suitable for protecting RS-485 communication lines?
Yes, SMAJ33AE3/TR13 is appropriate for RS-485 bus protection when configured in a unidirectional arrangement across the A/B differential pair and ground. Its 33 V standoff aligns with common 3.3 V or 5 V biased RS-485 transceivers, and its 53.3 V clamping ensures receiver inputs remain below absolute maximum ratings during IEC61000-4-4 EFT bursts. The SMAJ33AE3/TR13's sub-µA leakage avoids bias current disruption on termination networks.
Does SMAJ33AE3/TR13 meet IEC61000-4-5 Class 4 requirements?
Yes, SMAJ33AE3/TR13 meets IEC61000-4-5 Class 4 for secondary lightning immunity when tested with a 42 Ω source impedance, supporting up to 1.2 kV open-circuit surge voltage. Per Microsemi's application guidance in MSC0270A, SMAJ33AE3/TR13 is explicitly listed in the Class 4 coverage group (SMAJ5.0 to SMAJ12A or CA), confirming its validated performance envelope for this test level.
What is the moisture sensitivity level (MSL) of SMAJ33AE3/TR13?
SMAJ33AE3/TR13 has a moisture sensitivity level (MSL) of Level 1 per IPC/JEDEC J-STD-020B, meaning it is not humidity-sensitive and requires no dry pack or baking prior to reflow soldering. This is enabled by its void-free thermosetting epoxy body and RoHS-compliant matte-tin plating - both confirmed in the Microsemi MSC0270A datasheet.
Can SMAJ33AE3/TR13 be used in automotive under-hood applications?
Yes, SMAJ33AE3/TR13 is qualified for automotive under-hood use due to its −65 °C to +150 °C operating junction temperature range and robust construction per AEC-Q200 stress test recommendations. Its 500 W surge rating, low thermal resistance (15 °C/W), and RoHS-compliant plating make it suitable for protecting 33 V battery-fed subsystems such as body control modules and lighting drivers - provided PCB layout follows recommended thermal pad guidelines.
SMAJ33AE3/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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 9.4A
- 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)
SMAJ33AE3/TR13 FAQ
1.How can I place an order for SMAJ33AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33AE3/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 SMAJ33AE3/TR13 reliable?
The price and inventory of SMAJ33AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ33AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33AE3/TR13?
SMAJ33AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33AE3/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 SMAJ33AE3/TR13?
For technical support, including SMAJ33AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ33AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ33AE3/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 SMAJ33AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ33AE3/TR13?
All SMAJ33AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33AE3/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 SMAJ33AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ33AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33AE3/TR13 Tags
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