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Microchip Technology SMAJ4754E3/TR13
- Part No.:
- SMAJ4754E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4754E3/TR13.pdf
- Description:
- DIODE ZENER 39V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,823
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Product details
Overview
SMAJ4754E3/TR13 from Microsemi (now Microchip Technology) is a 2 W surface-mount silicon Zener diode with a nominal zener voltage of 39 V ±5%, 60 Ω dynamic impedance at 6.5 mA test current, and 115 mA peak surge current rating. It operates from –55°C to +150°C and is used for voltage regulation and overvoltage protection in DC power rails of industrial control modules.
For engineers reviewing the SMAJ4754E3/TR13 datasheet, SMAJ4754E3/TR13 pinout, SMAJ4754E3/TR13 application, or SMAJ4754E3/TR13 equivalent, key selection criteria include zener tolerance (±5%), thermal resistance (25°C/W), steady-state power dissipation (2.0 W), and DO-214AC package compatibility with automated SMT assembly.
Technical Context
This device functions as a precision shunt regulator by maintaining a stable 39 V reference across its terminals when reverse-biased above its breakdown threshold. Its 60 Ω dynamic impedance at 6.5 mA ensures low output voltage variation under load changes, and its 115 mA surge rating supports transient suppression per IEC 61000-4-5 Level 3.
The SMAJ4754E3/TR13 uses a planar-diffused junction structure in a DO-214AC (SMAJ) package with cathode band polarity marking. It meets MIL-STD-750 solderability requirements and is rated for 260°C/10 s reflow, making it suitable for high-reliability PCB assembly without derating below 100°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V ±5% - stable regulation point at 6.5 mA, usable for 3.3–48 V system rail clamping |
| Power Dissipation (PAV) | 2.0 W - requires 4.0 mm² copper pads per terminal for full thermal rating |
| Dynamic Impedance (ZZT) | 60 Ω @ 6.5 mA - limits output voltage shift to ≤390 mV for ±10 mA load change |
| Peak Surge Current (IS) | 115 mA - withstands 1/120 sec half-sine transients up to 115 A·s charge |
| Operating Temperature | –55°C to +150°C - qualified for under-hood automotive and industrial ambient environments |
| Thermal Resistance (RθJL) | 25°C/W - enables 2 W operation with ≤50°C junction-to-lead temperature rise |
Pinout & Package
DO-214AC (SMAJ) surface-mount package with molded epoxy body, flat handling surface, and cathode band indicating the cathode terminal. Dimensions: 4.93–5.48 mm length (G), 3.99–4.50 mm width (H), 2.57–2.79 mm height (J). Polarity marked by single black band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink during forward bias; reference ground node in shunt regulator configuration | Connected to system ground or lower-potential rail; must handle 200 mA forward current at ≤1.2 V drop |
| Cathode | Regulated output node during reverse breakdown | Connected to protected voltage rail; carries full surge current and steady-state zener current |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered electrical equivalence | Electrically identical to 1N4754A - enables legacy design reuse without circuit modification |
| High surge current capability | 115 mA peak (½-sine, 1/120 s) - protects against ESD and lightning-induced transients |
| Surface-mount flat handling surface | Accurate placement on pick-and-place machines; eliminates tombstoning risk in reflow |
| UL94V-0 flame-retardant epoxy | Meets flammability safety requirement for enclosed industrial enclosures and power supplies |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protects 24 V sensor input circuits from load dump and inductive switching transients. IC Role / Device Role / Timing Role: Shunt clamp regulating voltage at 39 V to prevent damage to downstream op-amps and ADC inputs. Use Value: Withstands 115 mA surge pulses while holding rail voltage within 5% of nominal, preserving signal integrity. | Use Scenario: Guards LIN bus transceiver supply rail against battery voltage spikes during alternator load dump. IC Role / Device Role / Timing Role: Standby overvoltage protector that activates only during >39 V excursions, drawing no quiescent current. Use Value: Enables compliance with ISO 7637-2 Pulse 5a without adding series resistance or active circuitry. |
| DC-DC Converter Feedback Clamp | Medical Power Supply Overvoltage Limiter |
Use Scenario: Limits feedback node voltage in isolated flyback converters to prevent controller latch-up during startup faults. IC Role / Device Role / Timing Role: Precision voltage clamp referenced to optocoupler LED anode, stabilizing regulation loop. Use Value: 60 Ω dynamic impedance ensures <100 mV deviation across 5–10 mA feedback current range. | Use Scenario: Safeguards 48 V auxiliary rail in Class II medical power supplies against internal fault overvoltage. IC Role / Device Role / Timing Role: Secondary-side passive overvoltage limiter meeting IEC 60601-1 creepage and reliability requirements. Use Value: UL94V-0 package and –55°C to +150°C rating support double-insulation and long-term stability in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4754A | Same 39 V ±5% zener voltage and 2 W rating, but in DO-41 through-hole package | Requires PCB redesign for through-hole mounting; not suitable for high-density SMT layouts | Select when legacy through-hole assembly or manual prototyping is required |
| MMSZ5245B-TP | 39 V ±5%, but 500 mW power rating and SOD-123 package; 100 Ω ZZT vs. 60 Ω | Limited to low-energy clamping; insufficient for 115 mA surge events | Select only for space-constrained, low-power bias/reference use - not for transient suppression |
Compared with 1N4754A and MMSZ5245B-TP, the SMAJ4754E3/TR13 uniquely delivers 2 W SMT-compatible Zener regulation with verified 115 mA surge capacity and DO-214AC mechanical robustness - critical for industrial and automotive power rail protection where thermal margin and board-level reliability are non-negotiable.
Availability
SMAJ4754E3/TR13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and medical power supply overvoltage limiting requiring stable component supply, traceable sourcing, and long-lifecycle availability.
Supply support for SMAJ4754E3/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 specifically for surface-mount voltage regulation and transient suppression in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and JEDEC-compatibility.
FAQ
What is the zener voltage tolerance of SMAJ4754E3/TR13?
The SMAJ4754E3/TR13 has a nominal zener voltage of 39 V with a tolerance of ±5%, as indicated by the absence of a tolerance suffix (e.g., 'C' for ±2% or 'D' for ±1%). This tolerance is specified at thermal equilibrium after 90 seconds of dc current application and applies across the full operating temperature range of –55°C to +150°C. The SMAJ4754E3/TR13 maintains this tolerance without requiring external trimming or calibration.
Can SMAJ4754E3/TR13 replace 1N4754A in existing designs?
Yes, the SMAJ4754E3/TR13 is electrically equivalent to the 1N4754A per manufacturer documentation, sharing identical zener voltage (39 V ±5%), test current (6.5 mA), dynamic impedance (60 Ω), and power rating (2 W). However, the SMAJ4754E3/TR13 uses a DO-214AC surface-mount package versus the DO-41 through-hole package of the 1N4754A, so PCB layout and assembly process must be updated accordingly.
What is the maximum surge current rating for SMAJ4754E3/TR13?
The SMAJ4754E3/TR13 is rated for a peak surge current (IS) of 115 mA, measured using a ½-sine wave or equivalent sine wave pulse with 1/120 second duration at 25°C ambient. This rating assumes proper PCB thermal design - specifically, mounting on 4.0 mm² copper pads per terminal - and is validated per industry-standard transient testing methods defined in the datasheet.
Is SMAJ4754E3/TR13 RoHS compliant and halogen-free?
Yes, the SMAJ4754E3/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 terminals and UL94V-0 flame-retardant epoxy encapsulation. Full compliance documentation, including material declarations and test reports, is available upon request from Aetrix Electronics for qualifying customers.
What is the thermal resistance from junction to lead (RθJL) for SMAJ4754E3/TR13?
The SMAJ4754E3/TR13 has a thermal resistance of 25°C/W from junction to lead (RθJL), measured under standard conditions with 4.0 mm² copper pads per terminal. This value enables full 2.0 W power dissipation up to 100°C lead temperature, with linear derating to zero power at 150°C. Exceeding the recommended pad area or using thinner copper will increase RθJL and reduce safe operating power.
SMAJ4754E3/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):
- 39 V
- Tolerance:
- ±10%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 60 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 29.7 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
SMAJ4754E3/TR13 FAQ
1.How can I place an order for SMAJ4754E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4754E3/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 SMAJ4754E3/TR13 reliable?
The price and inventory of SMAJ4754E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4754E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4754E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4754E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4754E3/TR13?
SMAJ4754E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4754E3/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 SMAJ4754E3/TR13?
For technical support, including SMAJ4754E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4754E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4754E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4754E3/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 SMAJ4754E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4754E3/TR13?
All SMAJ4754E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4754E3/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 SMAJ4754E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4754E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4754E3/TR13 Tags
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