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Microchip Technology SMAJ4755AE3/TR13
- Part No.:
- SMAJ4755AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4755AE3/TR13.pdf
- Description:
- DIODE ZENER 43V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,412
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Product details
Overview
SMAJ4755AE3/TR13 from Microsemi (now Microchip Technology) is a 2 W surface-mount silicon Zener diode with a nominal zener voltage of 43 V ±5%, 70 Ω dynamic impedance at 6 mA test current, and 110 mA peak surge current capability. It serves as a precision voltage regulator or overvoltage clamp in DC power rails and transient protection circuits for industrial power supplies.
For engineers reviewing the SMAJ4755AE3/TR13 datasheet, SMAJ4755AE3/TR13 pinout, SMAJ4755AE3/TR13 application, or SMAJ4755AE3/TR13 equivalent, key selection criteria include its DO-214AC package compatibility, 43 V regulation tolerance, thermal resistance of 25°C/W, and UL94V-0 flame-retardant epoxy construction for reliable surface-mount deployment.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across load variations and line transients. Its 43 V nominal zener voltage is specified at 6 mA test current (IZT), with 70 Ω dynamic impedance (ZZT) confirming low AC voltage variation under regulation.
Designed for surge immunity, it withstands 110 mA non-repetitive peak surge current (IS) per 1/120 s half-sine pulse and supports continuous operation from –55°C to +150°C junction temperature, enabled by 25°C/W junction-to-lead thermal resistance when mounted on 4.0 mm² copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V ±5% at IZT = 6 mA - defines regulated output voltage under nominal bias |
| Power Dissipation (PAV) | 2.0 W - maximum steady-state power at TL ≤ 100°C, derated linearly to zero at 150°C |
| Dynamic Impedance (ZZT) | 70 Ω @ IZT = 6 mA - indicates small-signal AC voltage stability during regulation |
| Peak Surge Current (IS) | 110 mA - maximum non-repetitive transient current for 1/120 s pulse, critical for ESD/surge clamping |
| Junction Temperature Range | –55°C to +150°C - enables use in automotive under-hood and industrial motor drive environments |
| Thermal Resistance (RθJL) | 25°C/W - quantifies heat transfer efficiency from junction to lead, dependent on PCB copper pad area |
Pinout & Package
Package: DO-214AC (SMAJ), surface-mount, cathode indicated by band. Dimensions conform to JEDEC standard with A = 1.98–2.92 mm length, G = 4.93–5.48 mm width, and H = 3.99–4.50 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage reference node | Connected to circuit ground or lower-potential rail during Zener operation |
| Cathode | Reverse-biased Zener terminal / regulated output node | Connected to protected node or voltage reference point; polarity marked by band |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount flat handling surface | Enables high-accuracy automated placement and reflow soldering on production lines |
| JEDEC 1N47xxA electrical equivalence | Direct functional replacement for legacy through-hole 1N4755A in redesigns requiring SMT conversion |
| UL94V-0 flame-retardant epoxy | Meets safety requirements for enclosed industrial and power supply enclosures |
| 260°C soldering tolerance | Supports standard lead-free reflow profiles without device degradation |
Applications
| Industrial Power Supply Regulation | Automotive ECU Voltage Reference |
|---|---|
Use Scenario: Stabilizing 43 V auxiliary rail in programmable logic controller (PLC) power modules. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp and regulate output voltage. Use Value: Maintains ±5% regulation accuracy across load currents up to 44 mA (IZM at TL = 100°C), ensuring downstream analog circuit integrity. | Use Scenario: Providing stable 43 V reference for sensor excitation in engine control units exposed to –40°C to +125°C ambient. IC Role / Device Role / Timing Role: Precision voltage reference element in analog front-end bias networks. Use Value: Delivers consistent regulation over full temperature range due to –55°C to +150°C operational rating and low ZZT. |
| DC-DC Converter Feedback Clamp | Transient Voltage Suppression (TVS) |
Use Scenario: Clamping feedback node voltage in isolated flyback converters to prevent controller latch-up. IC Role / Device Role / Timing Role: Overvoltage limiter protecting optocoupler input or error amplifier input. Use Value: Fast response to overvoltage events via 110 mA surge rating, limiting excursion within safe IC input thresholds. | Use Scenario: Secondary-stage surge suppression on 48 V telecom power distribution boards. IC Role / Device Role / Timing Role: Standby shunt protector absorbing induced transients before reaching sensitive loads. Use Value: Withstands repeated 1/120 s surges up to 110 mA without parameter shift, validated per MIL-STD-750 solderability. |
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; identical 43 V ±5% VZ, 2 W rating, and electrical specs | Requires PCB layout change from SMT to through-hole; not suitable for automated assembly | Select when legacy board repair or hand-soldered prototyping is required |
| MMSZ43ET1G | SOD-123 package; same 43 V ±5% VZ but lower 500 mW power rating and 100 mA IS | Lower power handling limits use to signal-level clamping, not power rail regulation | Select only for low-power bias/reference where 2 W dissipation is unnecessary |
Compared with SMAJ4755AE3/TR13, the 1N4755A offers identical regulation performance but requires manual assembly, while the MMSZ43ET1G reduces footprint and cost at the expense of power handling-making SMAJ4755AE3/TR13 optimal for 2 W SMT voltage regulation in industrial and automotive systems.
Availability
SMAJ4755AE3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, DC-DC converter feedback networks, and telecom transient suppression requiring stable component supply and long-term manufacturability.
Supply support for SMAJ4755AE3/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 surface-mount voltage regulation and transient suppression in harsh-environment power systems, emphasizing thermal robustness, JEDEC compatibility, and UL-certified packaging.
FAQ
What is the zener voltage tolerance of SMAJ4755AE3/TR13?
The SMAJ4755AE3/TR13 has a nominal zener voltage of 43 V with a tolerance of ±5%, as confirmed in the Electrical Characteristics table. This tolerance applies at 25°C with 6 mA test current (IZT) and thermal equilibrium conditions. The "A" suffix in the part number explicitly denotes the 5% tolerance grade per manufacturer documentation.
Does SMAJ4755AE3/TR13 support lead-free reflow soldering?
Yes, SMAJ4755AE3/TR13 supports lead-free reflow soldering with a maximum soldering temperature of 260°C for 10 seconds, per MIL-STD-750 Method 2026. Its DO-214AC package and UL94V-0 epoxy ensure reliability under standard Pb-free thermal profiles used in modern SMT assembly lines.
What is the maximum continuous zener current for SMAJ4755AE3/TR13 at 100°C lead temperature?
The maximum regulator current (IZM) for SMAJ4755AE3/TR13 is 44 mA when lead temperature (TL) is maintained at 100°C, as specified in the Electrical Characteristics table. This value decreases linearly to zero at 150°C, based on the 25°C/W thermal resistance and 2.0 W power rating.
Is SMAJ4755AE3/TR13 electrically equivalent to any through-hole Zener diodes?
Yes, SMAJ4755AE3/TR13 is electrically equivalent to the through-hole 1N4755A per manufacturer documentation, sharing identical zener voltage (43 V ±5%), dynamic impedance (70 Ω), power rating (2 W), and thermal specifications. This equivalence enables drop-in functional replacement in redesigns transitioning from through-hole to surface-mount layouts.
What is the peak surge current rating of SMAJ4755AE3/TR13 and how is it measured?
The peak surge current (IS) of SMAJ4755AE3/TR13 is 110 mA, measured using a 1/120 second duration half-sine wave or equivalent pulse at 25°C ambient. This rating reflects non-repetitive transient energy absorption capability and is validated per the test method described in Note 3 of the datasheet.
SMAJ4755AE3/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:
- ±5%
- 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
SMAJ4755AE3/TR13 FAQ
1.How can I place an order for SMAJ4755AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4755AE3/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 SMAJ4755AE3/TR13 reliable?
The price and inventory of SMAJ4755AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4755AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4755AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4755AE3/TR13 transactions.
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4.How is shipping managed for SMAJ4755AE3/TR13?
SMAJ4755AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4755AE3/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 SMAJ4755AE3/TR13?
For technical support, including SMAJ4755AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4755AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4755AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4755AE3/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 SMAJ4755AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4755AE3/TR13?
All SMAJ4755AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4755AE3/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 SMAJ4755AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4755AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4755AE3/TR13 Tags
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