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Microchip Technology SMAJ4752CE3/TR13
- Part No.:
- SMAJ4752CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4752CE3/TR13.pdf
- Description:
- DIODE ZENER 33V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,594
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Product details
Overview
SMAJ4752CE3/TR13 from Microsemi (now Microchip) is a 33 V, ±2% tolerance, 2 W surface-mount Zener diode in DO-214AC (SMA) package, rated for 135 mA maximum surge current and 54 mA maximum regulator current at 100°C, used for precision voltage regulation and overvoltage protection in DC power rails.
For engineers reviewing the SMAJ4752CE3/TR13 datasheet, SMAJ4752CE3/TR13 pinout, SMAJ4752CE3/TR13 application, or SMAJ4752CE3/TR13 equivalent, key selection factors include its tight 2% Zener voltage tolerance, 45 Ω dynamic impedance at 7.5 mA test current, cathode-band polarity marking, and UL94V-0 flame-retardant epoxy compatibility for industrial PCBs.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. It features a sharp knee characteristic verified by dual-point Zener impedance measurement (ZZT and ZZK) per Note 2, ensuring reliable regulation onset.
Designed for surface-mount assembly with flat handling surfaces and MIL-STD-2026 solderability, it supports reflow profiles up to 260°C for 10 seconds. Its thermal resistance of 25°C/W (junction-to-lead) enables 2 W steady-state dissipation when mounted on 4.0 mm² copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V ±2% - precise reference for 3.3 V–5 V logic supply clamping and feedback sensing |
| Test Current (IZT) | 7.5 mA - standard bias point for specifying regulation accuracy and dynamic impedance |
| Dynamic Impedance (ZZT) | 45 Ω @ IZT - low AC resistance ensures minimal output voltage variation under load transients |
| Max Regulator Current (IZM) | 54 mA @ TL = 100°C - defines safe continuous DC current limit with thermal derating |
| Surge Current (IS) | 135 mA - withstands short-duration overvoltage events (½-sine, 1/120 s) without failure |
| Power Dissipation (PAV) | 2.0 W - requires 4.0 mm² copper pad per lead for full rating; derates linearly above 100°C |
| Reverse Leakage (IR) | 5 µA @ 25.1 V - low leakage preserves efficiency in high-impedance bias networks |
Pinout & Package
DO-214AC (SMA) package: molded plastic body with cathode band marking; anode and cathode terminals aligned along axial centerline; compliant with JEDEC outline except for slightly larger dimension 'A' (max 2.92 mm vs. standard 2.66 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system GND or lower-potential rail; forms return path during Zener conduction |
| Cathode | Regulated output node | Connected to protected node (e.g., IC supply pin); voltage clamped to 33 V ±2% when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables tighter regulation than standard 5% parts (e.g., SMAJ4752A), reducing margin requirements in feedback loops |
| 135 mA peak surge current rating | Supports transient suppression per IEC 61000-4-5 Level 3 (1 kV/2 kV) without external series limiting |
| UL94V-0 flame-retardant epoxy | Meets safety standards for enclosed industrial and automotive control modules requiring non-propagating combustion |
| Cathode band polarity marking | Ensures unambiguous orientation during automated placement and visual inspection on high-density PCBs |
Applications
| Industrial Power Supply Monitoring | Automotive ECU Voltage Reference |
|---|---|
Use Scenario: Monitoring 3.3 V or 5 V microcontroller supply rails in programmable logic controllers. IC Role / Device Role / Timing Role: Zener diode provides stable 33 V reference for comparator-based overvoltage detection circuitry. Use Value: ±2% tolerance ensures trip threshold remains within 0.66 V window, minimizing false alarms during brownout recovery. | Use Scenario: Generating precise bias voltage for analog sensor signal conditioning in engine control units. IC Role / Device Role / Timing Role: Acts as shunt regulator supplying clean 33 V to op-amp input stages driving oxygen sensors. Use Value: 45 Ω dynamic impedance limits output variation to <15 mV across 1–10 mA load changes, preserving ADC accuracy. |
| Telecom Line Card Protection | Medical Infusion Pump Feedback Loop |
Use Scenario: Clamping induced surges on 48 V DC distribution lines feeding base station RF modules. IC Role / Device Role / Timing Role: Shunt protector placed across DC input to absorb 135 mA surge pulses without latch-up. Use Value: 2 W steady-state rating and 135 mA surge capability meet GR-1089-CORE Level 3 telecom surge immunity requirements. | Use Scenario: Stabilizing reference voltage for DAC-controlled motor driver in Class II medical devices. IC Role / Device Role / Timing Role: Provides isolated 33 V reference to voltage-controlled current source regulating stepper motor phase current. Use Value: UL94V-0 epoxy and -55°C to +150°C operating range support sterilization cycles and long-term reliability in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4752A | Through-hole DO-41 package; same 33 V ±5% nominal, but no C-suffix 2% option; higher ZZT (50 Ω) | Requires PCB through-hole mounting; less suitable for high-density SMT layouts | Select when legacy through-hole design or manual prototyping is required |
| MMSZ4708ET1G | SOD-123 package; 33 V ±5%; lower power (500 mW); ZZT = 50 Ω; IS = 30 mA | Not rated for 2 W continuous or 135 mA surge; limited to low-power signal-level clamping | Select only for space-constrained, low-energy circuits where 2 W rating is unnecessary |
Compared with 1N4752A and MMSZ4708ET1G, SMAJ4752CE3/TR13 delivers superior surge robustness and tighter voltage tolerance in a surface-mount form factor-critical for industrial power monitoring and automotive voltage references where layout density and regulation stability are prioritized.
Availability
SMAJ4752CE3/TR13 is available at Aetrix Electronics and suitable for industrial power supply monitoring, automotive ECU voltage reference, and telecom line card protection requiring stable component supply across extended temperature ranges and high-reliability production programs.
Supply support for SMAJ4752CE3/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 (acquired by Microchip Technology in 2018) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The SMAJ47xx series was designed specifically for surface-mount Zener regulation in harsh-environment power systems, emphasizing surge resilience, tight tolerance variants, and UL-certified packaging for mission-critical applications.
FAQ
What is the Zener voltage tolerance of SMAJ4752CE3/TR13?
The 'C' suffix in SMAJ4752CE3/TR13 denotes a ±2% Zener voltage tolerance at 33 V nominal, verified per manufacturer test conditions. This tighter tolerance compared to standard 5% parts (e.g., SMAJ4752A) enables more accurate voltage clamping in feedback networks and reduces design margin overhead in precision regulation circuits using SMAJ4752CE3/TR13.
Can SMAJ4752CE3/TR13 replace SMAJ4752A in existing designs?
Yes, SMAJ4752CE3/TR13 is a direct functional replacement for SMAJ4752A with identical DO-214AC package, pinout, and thermal characteristics-but offers improved ±2% voltage tolerance versus SMAJ4752A's ±5%. No PCB changes are required; however, verify that the tighter tolerance aligns with system-level regulation margins before deployment in SMAJ4752CE3/TR13-based revisions.
What is the maximum surge current rating for SMAJ4752CE3/TR13?
SMAJ4752CE3/TR13 is rated for 135 mA peak surge current (IS) under standardized ½-sine wave conditions (1/120 second duration) at 25°C ambient. This rating reflects its ability to absorb transient energy without degradation, making SMAJ4752CE3/TR13 suitable for IEC 61000-4-5-compliant surge protection in industrial and telecom power interfaces.
How does the thermal resistance of SMAJ4752CE3/TR13 affect its power handling?
SMAJ4752CE3/TR13 has a junction-to-lead thermal resistance (RθJL) of 25°C/W. When mounted on 4.0 mm² copper pads per terminal, it achieves full 2.0 W steady-state dissipation. Above 100°C lead temperature, power must be linearly derated to zero at 150°C-so proper copper area and airflow are essential to sustain rated performance in SMAJ4752CE3/TR13 applications.
Is SMAJ4752CE3/TR13 RoHS compliant and halogen-free?
Yes, SMAJ4752CE3/TR13 complies with RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The device uses lead-free matte tin plating on terminations and conforms to JEDEC J-STD-020 moisture sensitivity level (MSL) 1, supporting standard reflow profiles without preconditioning-key for high-volume manufacturing using SMAJ4752CE3/TR13.
SMAJ4752CE3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±2%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 25.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC
SMAJ4752CE3/TR13 FAQ
1.How can I place an order for SMAJ4752CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4752CE3/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 SMAJ4752CE3/TR13 reliable?
The price and inventory of SMAJ4752CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4752CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4752CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4752CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4752CE3/TR13?
SMAJ4752CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4752CE3/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 SMAJ4752CE3/TR13?
For technical support, including SMAJ4752CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4752CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4752CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4752CE3/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 SMAJ4752CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4752CE3/TR13?
All SMAJ4752CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4752CE3/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 SMAJ4752CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4752CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4752CE3/TR13 Tags
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