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Microchip Technology SMAJ33CAE3/TR13
- Part No.:
- SMAJ33CAE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33CAE3/TR13.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,811
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Product details
Overview
SMAJ33CAE3/TR13 from Microsemi is a bidirectional surface-mount transient voltage suppressor (TVS) designed for robust ESD, EFT, and secondary lightning surge protection in power and signal lines. It features a 33 V reverse standoff voltage (VWM), 36.7 V minimum breakdown voltage (VBR), 59.0 V maximum clamping voltage (VC) at 8.5 A peak pulse current, and 500 W peak pulse power rating at 10/1000 µs waveform-used in telecom power supplies, industrial I/O interfaces, and automotive body control modules.
For engineers reviewing the SMAJ33CAE3/TR13 datasheet, SMAJ33CAE3/TR13 pinout, SMAJ33CAE3/TR13 application, or SMAJ33CAE3/TR13 equivalent, key selection criteria include bidirectional clamping capability, RoHS-compliant matte-tin plating, DO-214AC package compatibility, and IEC61000-4-2/4-4/4-5 compliance for system-level EMC hardening.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its <100 ps theoretical response time (unidirectional) and <5 ns for bidirectional operation ensures effective suppression of fast transients including ESD events per IEC61000-4-2 Level 4 (±15 kV contact).
Rated for 500 W peak pulse power at 10/1000 µs, it delivers 8.5 A peak pulse current with clamping limited to 59.0 V-critical for safeguarding 3.3 V/5 V/12 V logic interfaces and analog front-ends. The device sustains operation from –65 °C to +150 °C and exhibits ≤1 μA standby leakage at 33 V standoff.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Reverse Standoff) | 33 V - Maximum continuous DC or RMS voltage before significant leakage; sets operating margin for 24–28 V nominal systems. |
| VBR min @ IBR | 36.7 V @ 1 mA - Confirmed breakdown threshold; ensures reliable triggering above normal operating voltage. |
| VC @ IPP | 59.0 V @ 8.5 A - Clamped voltage during 10/1000 µs surge; protects downstream ICs rated ≤60 V absolute max. |
| PPP (Peak Pulse Power) | 500 W - Sustained energy absorption capability under standardized surge waveform; enables single-device protection for mid-power interfaces. |
| IPP (Peak Pulse Current) | 8.5 A - Surge current handling at rated clamping; sufficient for IEC61000-4-5 Class 3 (42 Ω source, 1 kV) events. |
| ID @ VWM | ≤1 μA - Ultra-low leakage at rated standoff; avoids loading sensitive high-impedance circuits or battery-powered nodes. |
| Operating Temp Range | –65 °C to +150 °C - Qualified for under-hood automotive, industrial control, and outdoor telecom environments. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, void-free thermosetting epoxy case meeting UL94V-0; cathode band omitted on bidirectional variants; marking reads "33CAe3".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | No polarity designation; interchangeable connection for AC or floating lines; enables single-component protection of differential pairs or ungrounded sensors. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals, RS-485 buses, and isolated power rails without external polarity management. |
| RoHS-compliant matte-tin plating | Meets lead-free soldering requirements (260 °C/10 s); supports Pb-free reflow and eliminates tin whisker risk in long-life deployments. |
| IEC61000-4-5 secondary lightning compliance | Validated for Class 3 (42 Ω source) up to 1 kV; suitable for industrial Ethernet ports and PLC analog inputs exposed to induced surges. |
| DO-214AC mechanical footprint | Standardized land pattern (JEDEC MS-013 variant); ensures drop-in compatibility with existing SMA layouts and automated assembly tooling. |
| Low thermal resistance | 15 °C/W junction-to-lead; facilitates efficient heat dissipation during repetitive surge events in compact PCB spaces. |
Applications
| Industrial PLC Analog Inputs | Automotive Body Control Module (BCM) Power Lines |
|---|---|
Use Scenario: 0–10 V or 4–20 mA sensor inputs in programmable logic controllers exposed to inductive switching noise and ground bounce. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between input terminal and ground to limit transients before precision ADC or op-amp front-end. Use Value: Maintains signal integrity by clamping surges to ≤59.0 V while adding <0.5 pF capacitance-no bandwidth degradation in sub-MHz analog channels. |
Use Scenario: 12 V supply rail feeding microcontrollers, CAN transceivers, and LED drivers in door modules or lighting control units. IC Role / Device Role / Timing Role: Primary overvoltage protector on fused battery feed, positioned upstream of LDO regulators and load switches. Use Value: Absorbs load-dump spikes (up to ISO 7637-2 Pulse 5a) and ESD events without latch-up, preserving system uptime and reducing field failure rates. |
| Telecom Power Supply Outputs | RS-485/422 Data Line Protection |
Use Scenario: +24 V or +48 V DC output rails in PoE injectors and remote radio unit power supplies subject to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary surge limiter after primary MOV/GDT stage; provides precise clamping to protect DC-DC controller ICs and MOSFET gate drivers. Use Value: Limits clamped voltage to 59.0 V-well below 65 V absolute maximum ratings of common buck controllers-preventing catastrophic failure. |
Use Scenario: Differential data lines in building automation networks where cables run parallel to AC mains and experience coupled transients. IC Role / Device Role / Timing Role: Common-mode TVS connected between A/B lines and ground, leveraging bidirectional symmetry to suppress both positive and negative surges. Use Value: Provides matched clamping on both polarities with <5 ns response, preserving differential signal timing and minimizing bit errors during surge events. |
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 | Same electrical specs and DO-214AC package; lacks "e3" RoHS suffix and TR13 tape-and-reel packaging. | Not qualified for lead-free assembly; requires SnPb solder process or post-process cleaning for legacy lines. | Select SMAJ33CA only for non-RoHS production or when tape-and-reel logistics are not required. |
| SMBJ33CA-E3/52 | Higher 600 W PPP, same VWM/VC; SMB package (DO-214AA) with larger thermal mass and 20% larger footprint. | Better thermal performance for repetitive surges; incompatible with SMA land patterns without PCB redesign. | Choose SMBJ33CA-E3/52 when higher surge endurance is needed and board space allows SMB footprint. |
Compared with SMAJ33CA and SMBJ33CA-E3/52, SMAJ33CAE3/TR13 uniquely combines RoHS compliance, tape-and-reel delivery (750/reel), and strict DO-214AC footprint-making it optimal for high-volume, lead-free SMT lines requiring zero layout change and full traceability.
Availability
SMAJ33CAE3/TR13 is available at Aetrix Electronics and suitable for industrial PLC analog inputs, automotive BCM power lines, and telecom power supply outputs requiring stable component supply, full RoHS compliance, and guaranteed tape-and-reel logistics.
Supply support for SMAJ33CAE3/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 and mixed-signal components for aerospace, defense, and industrial markets.
The SMAJ series was engineered for cost-effective, surface-mount transient suppression in space-constrained, high-surge environments-targeting applications where DO-214AC footprint, 500 W rating, and bidirectional symmetry are essential.
FAQ
What does the "CA" suffix indicate in SMAJ33CAE3/TR13?
The "CA" suffix denotes a bidirectional configuration-meaning SMAJ33CAE3/TR13 clamps voltage transients equally in both polarities, unlike unidirectional "A" variants. This makes SMAJ33CAE3/TR13 ideal for protecting AC-coupled signals, differential buses like RS-485, or floating power domains where polarity reversal may occur during surge events.
Is SMAJ33CAE3/TR13 compatible with lead-free reflow processes?
Yes-SMAJ33CAE3/TR13 carries the "e3" RoHS-compliant suffix, indicating annealed matte-tin plating qualified for lead-free soldering at 260 °C for 10 seconds. Its thermal resistance (15 °C/W junction-to-lead) and UL94V-0 epoxy body ensure reliability during standard Pb-free reflow profiles used in modern SMT lines.
How does SMAJ33CAE3/TR13 perform under IEC61000-4-5 testing?
SMAJ33CAE3/TR13 is validated for IEC61000-4-5 secondary lightning immunity up to Class 3 (1 kV, 42 Ω source impedance). At its rated 8.5 A peak pulse current, it clamps to 59.0 V-well within safe operating limits for 3.3 V, 5 V, and 12 V interface ICs commonly found in industrial and automotive systems protected by SMAJ33CAE3/TR13.
What is the maximum steady-state power dissipation of SMAJ33CAE3/TR13?
SMAJ33CAE3/TR13 dissipates up to 5 W continuously at lead temperature (TL) of 75 °C, or 1.56 W at ambient temperature (TA) of 25 °C when mounted on a standard FR4 PCB with 1 oz copper and Microsemi's recommended footprint. This defines its safe DC power handling-not to be confused with its 500 W peak pulse rating.
Does SMAJ33CAE3/TR13 have polarity markings on the package?
No-SMAJ33CAE3/TR13 is a bidirectional TVS and carries no cathode band or polarity indicator. Its terminals are functionally identical and interchangeable. Marking on the device reads "33CAe3", confirming both bidirectionality and RoHS compliance without directional orientation requirements during placement.
SMAJ33CAE3/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:
- 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)
SMAJ33CAE3/TR13 FAQ
1.How can I place an order for SMAJ33CAE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33CAE3/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 SMAJ33CAE3/TR13 reliable?
The price and inventory of SMAJ33CAE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33CAE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ33CAE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33CAE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33CAE3/TR13?
SMAJ33CAE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33CAE3/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 SMAJ33CAE3/TR13?
For technical support, including SMAJ33CAE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33CAE3/TR13 requirements.
6.How does Aetrix verify that SMAJ33CAE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ33CAE3/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 SMAJ33CAE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ33CAE3/TR13?
All SMAJ33CAE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33CAE3/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 SMAJ33CAE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ33CAE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ33CAE3/TR13 Tags
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onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
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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