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Microchip Technology SMAJ4752E3/TR13
- Part No.:
- SMAJ4752E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4752E3/TR13.pdf
- Description:
- DIODE ZENER 33V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,900
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Product details
Overview
SMAJ4752E3/TR13 from Microsemi (now part of Microchip Technology) is a 33 V, 2 W surface-mount Zener diode in DO-214AC (SMA) package, rated for 7.5 mA test current, 45 Ω dynamic impedance at IZT, and 135 mA peak surge current; used for voltage regulation and overvoltage protection in DC power rails and interface circuits.
For engineers reviewing the SMAJ4752E3/TR13 datasheet, SMAJ4752E3/TR13 pinout, SMAJ4752E3/TR13 application, or SMAJ4752E3/TR13 equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (25 °C/W), steady-state power dissipation (2.0 W), and JEDEC DO-214AC mechanical compatibility.
Technical Context
This device operates as a precision shunt regulator with sharp breakdown knee (ZZK = 1000 Ω @ IZK = 0.25 mA), designed for stable DC voltage reference and transient suppression in low-power analog and digital supply domains. Its 33 V nominal zener voltage is specified at thermal equilibrium after 90 seconds of DC bias.
The SMAJ4752E3/TR13 complies with JEDEC DO-214AC outline and supports soldering per MIL-STD-750 Method 2026, with cathode band polarity marking and UL94V-0 flame-retardant epoxy encapsulation for surface-mount reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V ±5% at IZT = 7.5 mA - defines regulated output voltage under nominal bias |
| Power Dissipation (PAV) | 2.0 W - maximum continuous power at TL ≤ 100 °C on 4.0 mm² copper pads |
| Dynamic Impedance (ZZT) | 45 Ω @ IZT - indicates voltage stability under small-signal AC variation |
| Peak Surge Current (IS) | 135 mA - withstands ½-sine wave transients (1/120 s duration) without failure |
| Reverse Leakage (IR) | 5 µA @ VR = 25.1 V - ensures minimal quiescent current in standby regulation |
| Thermal Resistance (RθJL) | 25 °C/W - junction-to-lead thermal path determines derating above 100 °C |
| Operating Temperature | –55 °C to +150 °C - supports industrial and automotive under-hood environments |
Pinout & Package
DO-214AC (SMA) surface-mount package with molded plastic body, flat handling surface for accurate placement, and cathode band marking on one end. Terminals are solderable per MIL-STD-750 Method 2026; max solder temperature is 260 °C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential node in reverse-biased Zener operation |
| Cathode | Current exit terminal during forward conduction; marked by band | Connected to higher-potential node in Zener regulation; defines polarity for correct biasing |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC DO-214AC footprint | Enables drop-in replacement for legacy 1N4752A and compatible SMT assembly lines |
| 2 W steady-state power rating | Supports sustained regulation in 5–12 V rail clamp and feedback divider applications |
| Sharp breakdown knee (ZZK = 1000 Ω) | Ensures predictable turn-on behavior for precision reference and clamping |
| UL94V-0 epoxy encapsulation | Meets flammability requirements for safety-critical industrial PCBs |
| Tape-and-reel packaging (TR13) | Enables automated pick-and-place assembly with EIA-481 compliant carrier tape |
Applications
| Industrial Power Monitoring | Automotive Body Control Module |
|---|---|
Use Scenario: Voltage reference for ADC input scaling in 24 V battery-supplied sensor nodes. IC Role / Device Role / Timing Role: Shunt regulator providing stable 33 V reference to op-amp buffer driving SAR ADC. Use Value: Maintains <±0.5% reference accuracy across –40 °C to +125 °C due to tight 5% VZ tolerance and low ZZT. | Use Scenario: Overvoltage clamp on LIN bus transceiver VCC pin during load dump events. IC Role / Device Role / Timing Role: Transient suppressor limiting supply rail to 33 V during 40 V/100 ms surges. Use Value: Absorbs 135 mA surge pulses without degradation, protecting downstream 3.3 V LDO and MCU. |
| Telecom Line Interface | Medical Instrumentation Supply |
Use Scenario: Bias voltage generator for photodiode TIA in optical receiver front-end. IC Role / Device Role / Timing Role: Low-noise Zener source replacing active reference IC to reduce component count. Use Value: Delivers 33 V with 45 Ω ZZT and <5 µA leakage, minimizing TIA input offset drift. | Use Scenario: Secondary regulation stage in isolated 5 V → 33 V auxiliary supply for analog front-end. IC Role / Device Role / Timing Role: Precision shunt regulator stabilizing high-impedance feedback network. Use Value: Enables ±0.25% output regulation via 33 V reference with 1000 Ω knee impedance for clean settling. |
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%, 2 W rating, but higher RθJA (65 °C/W) | Requires PCB through-hole layout; unsuitable for high-density SMT designs | Select SMAJ4752E3/TR13 for automated assembly and thermal performance in compact layouts |
| BZX84-C33 | SOT-23 package; 33 V ±5%, 300 mW PAV; ZZT = 95 Ω @ 5 mA | Lower power handling limits use to signal-level clamping, not rail regulation | Choose SMAJ4752E3/TR13 where 2 W dissipation and 135 mA surge capability are required |
Compared with 1N4752A and BZX84-C33, SMAJ4752E3/TR13 delivers superior thermal management (25 °C/W vs. 65 °C/W), higher surge robustness (135 mA vs. ~50 mA), and SMT manufacturability-making it optimal for space-constrained, high-reliability power regulation.
Availability
SMAJ4752E3/TR13 is available at Aetrix Electronics and suitable for industrial power monitoring, automotive body control modules, telecom line interfaces, and medical instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ4752E3/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, mixed-signal, and radiation-hardened components.
The SMAJ series was developed for ruggedized surface-mount voltage regulation and transient suppression in harsh-environment applications including aerospace, defense, and industrial automation.
FAQ
What is the zener voltage tolerance for SMAJ4752E3/TR13?
The SMAJ4752E3/TR13 has a nominal zener voltage of 33 V with a tolerance of ±5%, as confirmed in the Electrical Characteristics table. This tolerance applies at thermal equilibrium (90 seconds after DC current application) and is standard for parts without suffix letters; no "C" (2%) or "D" (1%) suffix is present in this variant.
Can SMAJ4752E3/TR13 replace 1N4752A in existing designs?
Yes, SMAJ4752E3/TR13 is electrically equivalent to 1N4752A per the datasheet note, sharing identical zener voltage, test current, and dynamic impedance. However, its DO-214AC package requires PCB footprint revision from DO-41, and its lower thermal resistance (25 °C/W vs. 65 °C/W) improves power handling in thermally constrained layouts.
What is the maximum surge current rating for SMAJ4752E3/TR13?
The SMAJ4752E3/TR13 is rated for a peak surge current (IS) of 135 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating enables reliable transient suppression in automotive load-dump and industrial switching-noise scenarios.
How is polarity indicated on SMAJ4752E3/TR13?
Polarity on SMAJ4752E3/TR13 is indicated by a visible cathode band on the package body, consistent with JEDEC DO-214AC mechanical specifications. During circuit design, the banded end must connect to the higher-potential node to ensure proper reverse-bias operation in Zener regulation mode.
What is the recommended pad layout for SMAJ4752E3/TR13?
The datasheet specifies mounting on 4.0 mm² copper pads per terminal to achieve the rated 2.0 W power dissipation and 25 °C/W thermal resistance. Pad dimensions should follow the DO-214AC outline drawing: terminal width 1.32–1.47 mm (B), length 4.93–5.48 mm (G), and center-to-center pitch ~5.0 mm.
SMAJ4752E3/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:
- ±10%
- 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
SMAJ4752E3/TR13 FAQ
1.How can I place an order for SMAJ4752E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4752E3/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 SMAJ4752E3/TR13 reliable?
The price and inventory of SMAJ4752E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4752E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4752E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4752E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4752E3/TR13?
SMAJ4752E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4752E3/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 SMAJ4752E3/TR13?
For technical support, including SMAJ4752E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4752E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4752E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4752E3/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 SMAJ4752E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4752E3/TR13?
All SMAJ4752E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4752E3/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 SMAJ4752E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4752E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4752E3/TR13 Tags
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