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Microchip Technology SMAJ4755CE3/TR13
- Part No.:
- SMAJ4755CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4755CE3/TR13.pdf
- Description:
- DIODE ZENER 43V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,591
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Product details
Overview
SMAJ4755CE3/TR13 from Microsemi (now Microchip) is a 2 W surface-mount Zener diode with a nominal zener voltage of 43 V ±2%, 70 Ω dynamic impedance at 6 mA test current, and 110 mA peak surge current capability; used for precision voltage regulation and overvoltage protection in DC power rails and analog reference circuits.
For engineers reviewing the SMAJ4755CE3/TR13 datasheet, SMAJ4755CE3/TR13 pinout, SMAJ4755CE3/TR13 application, or SMAJ4755CE3/TR13 equivalent, key selection criteria include zener tolerance (±2%), thermal resistance (25°C/W), steady-state power rating (2.0 W), and DO-214AC package compatibility with automated SMT assembly.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to clamp voltage at 43 V with sharp knee characteristics verified by dual-point ZZK and ZZT measurement per Note 2. It maintains regulation under transient surges up to 110 mA (½-sine, 1/120 s) and supports continuous dissipation of 2.0 W when mounted on 4.0 mm² copper pads.
The SMAJ4755CE3/TR13 exhibits a maximum reverse current of 5 µA at 32.7 V test voltage and a forward voltage of 1.2 V at 200 mA, enabling bidirectional protection and low-loss forward conduction where needed. Its -55°C to +150°C operating range and UL94V-0 flame-retardant epoxy housing suit industrial and automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V ±2% - precise clamping threshold for 42–44 V rail protection |
| Test Current (IZT) | 6.0 mA - standard bias point for specifying regulation accuracy and impedance |
| Dynamic Impedance (ZZT) | 70 Ω @ 6 mA - low AC impedance ensures stable regulation under small-signal ripple |
| Peak Surge Current (IS) | 110 mA - withstands short-duration transients without degradation |
| Steady-State Power (PAV) | 2.0 W - requires 4.0 mm² copper pad per terminal for full rating |
| Thermal Resistance (RθJL) | 25°C/W - enables thermal design with known junction-to-lead delta under load |
| Reverse Current (IR) | 5 µA @ 32.7 V - minimal leakage below knee voltage preserves system efficiency |
Pinout & Package
DO-214AC (SMAJ) surface-mount package with cathode band marking; 2-terminal unidirectional configuration; polarity indicated by single black band at cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side | Connects to lower-potential node during normal operation; carries forward current up to 200 mA |
| Cathode | Reverse breakdown terminal / high-voltage side | Connected to protected node; sinks current when voltage exceeds 43 V, clamping transient energy |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener Tolerance (C suffix) | Enables tighter voltage margin control vs. standard ±5% parts, reducing design guardbanding |
| 2 W Steady-State Rating | Supports higher continuous power handling than 1 W Zeners, extending reliability in sustained overvoltage events |
| DO-214AC Surface-Mount Package | Provides flat handling surface for accurate pick-and-place placement and reflow compatibility |
| 110 mA Peak Surge Current | Meets IEC 61000-4-5 Level 3 surge immunity requirements for industrial interfaces |
| UL94V-0 Flame-Retardant Epoxy | Ensures compliance with safety standards for enclosed power supply and control modules |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Clamping transient spikes on 48 V auxiliary rails during load dump or relay switching. IC Role / Device Role / Timing Role: Voltage regulator and overvoltage protector for microcontroller power input. Use Value: Prevents damage to downstream 3.3 V LDOs and MCU cores by limiting rail voltage to ≤44 V. | Use Scenario: Stabilizing reference voltage for analog sensor signal conditioning in cabin temperature sensors. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 43 V bias for op-amp gain-setting networks. Use Value: Maintains <±0.86 V regulation error across temperature, improving sensor linearity by >0.5% FS. |
| Telecom DC-DC Converter Feedback | Medical Equipment ESD Clamp |
Use Scenario: Setting output voltage in isolated flyback converters via optocoupler feedback loop. IC Role / Device Role / Timing Role: Secondary-side voltage reference for closed-loop regulation. Use Value: Enables ±2% output accuracy over line/load/temperature with minimal drift (<0.05%/°C typical). | Use Scenario: Protecting front-end ADC inputs from human-body-model (HBM) ESD events up to ±8 kV. IC Role / Device Role / Timing Role: Fast-acting transient voltage suppressor placed directly at connector interface. Use Value: Limits clamping voltage to 44 V within 1 ns, preventing latch-up in 12-bit SAR ADCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4755A | Through-hole DO-41 package; ±5% tolerance; same 43 V nominal rating | Requires manual or wave soldering; unsuitable for high-density SMT layouts | Select when legacy through-hole assembly or prototyping on breadboard/perfboard is required |
| BZX84-C43 | SOT-23 package; ±5% tolerance; 300 mW power rating; 43 V nominal | Limited to low-energy transients; not rated for 2 W continuous or 110 mA surge | Select only for space-constrained, low-power signal-level clamping-not for power rail protection |
Compared with 1N4755A and BZX84-C43, the SMAJ4755CE3/TR13 delivers superior surge robustness (110 mA vs. ~50 mA), tighter tolerance (±2% vs. ±5%), and SMT scalability-making it optimal for production-grade 48 V industrial systems requiring long-term reliability and automated assembly.
Availability
SMAJ4755CE3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom DC-DC converters, and medical equipment ESD protection requiring stable component supply and traceable sourcing.
Supply support for SMAJ4755CE3/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 designed specifically for surface-mount voltage regulation and transient suppression in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and tight parametric control.
FAQ
What is the zener voltage tolerance of SMAJ4755CE3/TR13?
The 'C' suffix in SMAJ4755CE3/TR13 denotes a ±2% zener voltage tolerance at 25°C, meaning the actual breakdown voltage falls between 42.14 V and 43.86 V under specified test conditions. This tighter tolerance improves regulation accuracy compared to standard ±5% Zeners like the SMAJ4755A, making SMAJ4755CE3/TR13 suitable for applications demanding precise voltage clamping without additional trimming circuitry.
Can SMAJ4755CE3/TR13 replace SMAJ4755A in existing designs?
Yes, SMAJ4755CE3/TR13 is a direct functional replacement for SMAJ4755A with identical DO-214AC package, pinout, and thermal profile-but offers improved ±2% voltage tolerance versus ±5%. No PCB layout changes are required. However, designers should verify that the tighter tolerance does not cause unintended interaction with adjacent regulation thresholds in multi-Zener schemes.
What is the maximum steady-state power dissipation for SMAJ4755CE3/TR13?
The SMAJ4755CE3/TR13 has a rated steady-state power dissipation of 2.0 W at 25°C ambient, derating linearly to zero at 150°C junction temperature. Full power operation requires mounting on 4.0 mm² copper pads per terminal per the datasheet; using smaller pads reduces allowable power and increases thermal resistance beyond the specified 25°C/W.
How is polarity marked on SMAJ4755CE3/TR13?
Polarity on SMAJ4755CE3/TR13 is indicated by a single black cathode band located near one end of the DO-214AC package. The terminal adjacent to the band is the cathode; the opposite end is the anode. This marking aligns with JEDEC DO-214AC standards and is visible under standard optical inspection during SMT placement verification.
Does SMAJ4755CE3/TR13 meet any safety certifications?
Yes, SMAJ4755CE3/TR13 uses UL94V-0 rated flame-retardant epoxy encapsulation, satisfying flammability requirements for end equipment in industrial and medical applications. It also complies with MIL-STD-750 Method 2026 for solderability and supports lead-free reflow profiles up to 260°C for 10 seconds-enabling RoHS-compliant manufacturing without derating.
SMAJ4755CE3/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):
- 43 V
- Tolerance:
- ±2%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 32.7 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
SMAJ4755CE3/TR13 FAQ
1.How can I place an order for SMAJ4755CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4755CE3/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 SMAJ4755CE3/TR13 reliable?
The price and inventory of SMAJ4755CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4755CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4755CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4755CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4755CE3/TR13?
SMAJ4755CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4755CE3/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 SMAJ4755CE3/TR13?
For technical support, including SMAJ4755CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4755CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4755CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4755CE3/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 SMAJ4755CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4755CE3/TR13?
All SMAJ4755CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4755CE3/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 SMAJ4755CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4755CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4755CE3/TR13 Tags
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MM5Z5V1ST1G
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