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Microchip Technology SMAJ4752AE3/TR13
- Part No.:
- SMAJ4752AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4752AE3/TR13.pdf
- Description:
- DIODE ZENER 33V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,691
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Product details
Overview
SMAJ4752AE3/TR13 from Microsemi (now Microchip Technology) is a 33 V, 5% tolerance, 2 W surface-mount Zener diode in DO-214AC (SMA) package, rated for 135 mA peak surge current and 54 mA maximum regulator current at 100°C, used for voltage regulation and overvoltage protection in DC power rails and interface circuits.
For engineers reviewing the SMAJ4752AE3/TR13 datasheet, SMAJ4752AE3/TR13 pinout, SMAJ4752AE3/TR13 application, or SMAJ4752AE3/TR13 equivalent, key selection criteria include zener voltage tolerance, surge current capability, thermal resistance (25°C/W), and DO-214AC mounting compatibility with automated SMT assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and line conditions. It features a sharp knee impedance (ZZK = 1000 Ω @ IZK = 0.25 mA) and low dynamic impedance (ZZT = 45 Ω @ IZT = 7.5 mA), ensuring precise regulation in feedback loops and clamp circuits.
Designed for surface-mount use, it complies with MIL-STD-750 solderability standards and supports UL94V-0 flame-retardant PCB mounting. Polarity is marked by a cathode band, and maximum solder temperature is 260°C for 10 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V ±5% - defines clamping threshold for overvoltage protection and reference accuracy |
| Power Dissipation (PAV) | 2.0 W - maximum steady-state power at 100°C case temperature with 4.0 mm² copper pads |
| Test Current (IZT) | 7.5 mA - standard bias point for measuring VZ and dynamic impedance |
| Dynamic Impedance (ZZT) | 45 Ω @ 7.5 mA - indicates regulation stiffness; lower values improve load regulation |
| Peak Surge Current (IS) | 135 mA - ½-sine wave, 1/120 sec pulse rating for transient suppression |
| Reverse Leakage (IR) | 5 µA @ 25.1 V - ensures minimal standby current in high-impedance clamp applications |
| Thermal Resistance (RθJL) | 25°C/W - junction-to-lead thermal path; critical for derating above 100°C |
Pinout & Package
DO-214AC (SMA) package: molded plastic body with flat handling surface for accurate placement; cathode indicated by band; terminals solderable per MIL-STD-750, Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Reverse-biased terminal / regulation output | Connected to protected node; voltage referenced to anode; marked by band |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount DO-214AC footprint | Enables automated placement and reflow compatibility with standard SMA land patterns |
| 2 W steady-state power rating | Supports continuous regulation in 5–12 V rail monitors without external heatsinking |
| 135 mA peak surge current | Withstands IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) in industrial interface protection |
| Sharp knee impedance (1000 Ω @ 0.25 mA) | Ensures stable turn-on behavior below rated test current for precision clamping |
| JEDEC 1N47xxA electrical equivalence | Allows drop-in replacement of through-hole 1N4752A in legacy designs with layout adaptation |
Applications
| Industrial Power Supply Monitoring | Automotive ECU Input Protection |
|---|---|
Use Scenario: Monitoring +24 V supply rail in PLC I/O modules for brownout detection and overvoltage shutdown. IC Role / Device Role / Timing Role: Zener reference element in comparator-based supervisor circuit. Use Value: 33 V clamping threshold provides 10% margin above nominal 24 V rail, enabling reliable fault detection before downstream damage. | Use Scenario: Protecting microcontroller GPIO pins from load-dump transients on 12 V battery lines. IC Role / Device Role / Timing Role: Transient voltage suppressor (TVS) in parallel with input filter capacitor. Use Value: 135 mA surge rating handles ISO 7637-2 Pulse 5a (35 V, 100 ms) without degradation when properly decoupled. |
| DC-DC Converter Feedback Clamp | RS-485 Transceiver VCC Stabilization |
Use Scenario: Clamping error amplifier output in isolated flyback controller to limit secondary-side reference excursion. IC Role / Device Role / Timing Role: Precision voltage clamp in optocoupler feedback loop. Use Value: 45 Ω dynamic impedance minimizes regulation error across 1–10 mA feedback current range, improving output accuracy. | Use Scenario: Stabilizing 5 V supply to RS-485 transceiver ICs in noisy factory-floor communication nodes. IC Role / Device Role / Timing Role: Local shunt regulator maintaining clean VCC despite shared rail noise. Use Value: 2 W power rating sustains 50 mA average current draw while absorbing burst noise up to 135 mA without thermal runaway. |
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; identical 33 V ±5%, 1 W rating; lower surge current (75 mA) | Requires PCB through-hole layout; unsuitable for high-density SMT designs | Select when retrofitting legacy boards or where manual assembly is preferred |
| BZX84-C33 | SOT-23 package; same 33 V ±5%; lower power (300 mW); higher ZZT (90 Ω) | Limited to low-current bias/reference roles; not rated for surge suppression | Select only for space-constrained, low-power reference applications-not for protection |
Compared with 1N4752A and BZX84-C33, SMAJ4752AE3/TR13 uniquely combines SMT compatibility, 2 W dissipation, and 135 mA surge capability-making it the only option among the three suitable for industrial-grade transient suppression in compact layouts.
Availability
SMAJ4752AE3/TR13 is available at Aetrix Electronics and suitable for industrial power monitoring, automotive ECU protection, and RS-485 communication systems requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ4752AE3/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 SMAJ47xxA series was designed for ruggedized surface-mount voltage regulation and transient suppression in industrial, aerospace, and automotive environments where thermal stability and surge resilience are critical.
FAQ
What is the Zener voltage tolerance of SMAJ4752AE3/TR13?
SMAJ4752AE3/TR13 has a nominal Zener voltage of 33 V with a ±5% tolerance, as confirmed by the "E3" suffix per manufacturer documentation. This means the actual measured VZ falls between 31.35 V and 34.65 V at IZT = 7.5 mA and 25°C ambient. The tolerance is tighter than standard 10% variants (no suffix) and looser than 2% (C) or 1% (D) versions in the same family.
Can SMAJ4752AE3/TR13 replace 1N4752A in existing designs?
Yes, SMAJ4752AE3/TR13 is electrically equivalent to 1N4752A per datasheet note, but requires PCB layout changes due to its DO-214AC (SMA) surface-mount package versus DO-41 through-hole. SMAJ4752AE3/TR13 offers higher power (2 W vs. 1 W) and surge rating (135 mA vs. 75 mA), making it suitable for upgraded reliability-but mechanical adaptation is mandatory.
What is the maximum operating temperature for SMAJ4752AE3/TR13?
SMAJ4752AE3/TR13 has a specified operating and storage temperature range of –55°C to +150°C. Its power dissipation must be linearly derated above 100°C case temperature, reaching zero watt capability at 150°C. Thermal resistance is 25°C/W junction-to-lead, so proper copper pad design (4.0 mm² per terminal) is essential to maintain safe junction temperatures.
How is polarity identified on SMAJ4752AE3/TR13?
Polarity on SMAJ4752AE3/TR13 is indicated by a visible cathode band near one end of the DO-214AC package body. During Zener operation, the cathode connects to the higher-potential node (e.g., protected rail), and the anode connects to ground or lower potential. This marking aligns with JEDEC DO-214AC mechanical standards and is verified in the device's dimensional drawing and packaging documentation.
Is SMAJ4752AE3/TR13 RoHS compliant and halogen-free?
SMAJ4752AE3/TR13 is RoHS compliant per Microchip's product change notices and material declarations. The "E3" suffix denotes lead-free termination and compliance with EU RoHS Directive 2011/65/EU. Halogen content is not explicitly stated in the provided datasheet, but Microchip's standard SMAJ series uses halogen-free molding compounds consistent with IPC-4101D/126 requirements.
SMAJ4752AE3/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:
- ±5%
- 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
SMAJ4752AE3/TR13 FAQ
1.How can I place an order for SMAJ4752AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4752AE3/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 SMAJ4752AE3/TR13 reliable?
The price and inventory of SMAJ4752AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4752AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4752AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4752AE3/TR13 transactions.
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4.How is shipping managed for SMAJ4752AE3/TR13?
SMAJ4752AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4752AE3/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 SMAJ4752AE3/TR13?
For technical support, including SMAJ4752AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4752AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4752AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4752AE3/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 SMAJ4752AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4752AE3/TR13?
All SMAJ4752AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4752AE3/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 SMAJ4752AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4752AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4752AE3/TR13 Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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MM5Z5V1ST1G
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