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Microchip Technology SMAJ4758E3/TR13
- Part No.:
- SMAJ4758E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4758E3/TR13.pdf
- Description:
- DIODE ZENER 56V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,974
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Product details
Overview
SMAJ4758E3/TR13 from Microsemi (now Microchip Technology) is a 2 W surface-mount silicon Zener diode with a nominal zener voltage of 56 V ±5%, 110 Ω dynamic impedance at 4.5 mA test current, and 80 A peak surge current capability; used for overvoltage protection in DC power rails and voltage regulation in industrial control modules.
For engineers reviewing the SMAJ4758E3/TR13 datasheet, SMAJ4758E3/TR13 pinout, SMAJ4758E3/TR13 application, or SMAJ4758E3/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 operates as a precision voltage reference and transient suppressor in unidirectional configurations, leveraging a sharp breakdown knee (ZZK = 2000 Ω at IZK = 0.25 mA) and low leakage (<5 µA at 42.6 V). Its thermal design assumes mounting on 4.0 mm² copper pads per terminal, with linear derating above 100 °C to zero power at 150 °C.
The SMAJ4758E3/TR13 complies with JEDEC DO-214AC mechanical standards (with minor dimensional variance noted), features cathode band polarity marking, and supports soldering at 260 °C for 10 seconds per MIL-STD-750 Method 2026.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V ±5% - defines clamping threshold for overvoltage protection circuits |
| Test Current (IZT) | 4.5 mA - operating point for specified zener voltage and impedance |
| Dynamic Impedance (ZZT) | 110 Ω - indicates voltage regulation stability under small-signal AC variation |
| Peak Surge Current (IS) | 80 A - maximum non-repetitive 1/120 s pulse handling capacity |
| Steady-State Power (PAV) | 2.0 W - continuous dissipation limit with specified PCB copper pad area |
| Thermal Resistance (RθJL) | 25 °C/W - junction-to-lead thermal path efficiency under defined mounting conditions |
| Operating Temperature | –55 °C to +150 °C - qualified range for industrial and automotive under-hood environments |
Pinout & Package
Package: DO-214AC (SMAJ), surface-mount, cathode-indicated by band; compliant with JEDEC outline with max dimension A = 2.92 mm (vs. standard 2.66 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward bias | Connected to lower-potential node in reverse-biased zener operation |
| Cathode | Current exit during forward bias; zener breakdown terminal | Marked by band; connected to higher-potential node for voltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount flat handling surface | Enables accurate pick-and-place placement and consistent reflow alignment |
| JEDEC 1N47xxA electrical equivalence | Direct functional replacement for legacy through-hole 1N4758A in redesigns |
| High surge current rating (80 A) | Withstands repetitive ESD and lightning-induced transients in industrial interfaces |
| UL94V-0 flame-retardant epoxy housing | Meets safety requirements for enclosed power supply and motor drive enclosures |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Clamping induced transients on 48 V battery-fed DC-DC converter input rails. IC Role / Device Role / Timing Role: Unidirectional voltage clamp protecting downstream regulators and microcontrollers. Use Value: 56 V zener voltage aligns with ISO 7637-2 Pulse 1/2b thresholds; 80 A surge rating handles load-dump energy without degradation. | Use Scenario: Regulating reference voltage for analog sensor signal conditioning in BCM subassemblies. IC Role / Device Role / Timing Role: Stable 56 V reference source for precision op-amp bias networks. Use Value: ±5% tolerance and 110 Ω dynamic impedance ensure <±100 mV drift across temperature and load variations. |
| Telecom Line Card Protection | Renewable Energy Inverter Control |
Use Scenario: Secondary overvoltage suppression on -48 V telecom backplane distribution lines. IC Role / Device Role / Timing Role: Standby shunt regulator absorbing line surges before primary TVS activation. Use Value: 2.0 W steady-state power enables sustained clamping during prolonged overvoltage events without thermal runaway. | Use Scenario: Voltage stabilization for gate driver IC bias rails in solar inverter half-bridge stacks. IC Role / Device Role / Timing Role: Zener reference maintaining stable VCC for isolated gate drivers under high dv/dt noise. Use Value: –55 °C to +150 °C operating range supports outdoor-rated inverters exposed to desert or arctic ambient extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4758A | Through-hole DO-41 package; identical electrical specs (56 V, ±5%, 2 W) | Requires PCB redesign for through-hole mounting; no SMT compatibility | Select when legacy board repair or prototyping with breadboard-friendly leads is required |
| SMBJ56A | 600 W peak power rating; same 56 V nominal voltage but higher surge capacity (100 A) | Designed for primary-level surge suppression; larger SMB package increases board area | Select when system-level IEC 61000-4-5 compliance requires higher single-pulse energy absorption |
Compared with SMAJ4758E3/TR13, 1N4758A offers identical regulation performance but lacks SMT manufacturability, while SMBJ56A trades compact size for greater surge robustness-making SMAJ4758E3/TR13 optimal for space-constrained secondary protection where 2 W steady-state and 80 A surge meet design margins.
Availability
SMAJ4758E3/TR13 is available at Aetrix Electronics and suitable for industrial power supply protection, automotive body control modules, and telecom line card protection requiring stable component supply and full traceability.
Supply support for SMAJ4758E3/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 semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components.
The SMAJ47xx series was designed for surface-mount voltage regulation and transient suppression in harsh-environment power systems, emphasizing thermal robustness and JEDEC-compliant packaging.
FAQ
What is the zener voltage tolerance for SMAJ4758E3/TR13?
The SMAJ4758E3/TR13 has a nominal zener voltage of 56 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 measured at thermal equilibrium or 90 seconds after applying DC test current, per the manufacturer's datasheet MSC0284A.
Is SMAJ4758E3/TR13 compatible with automated SMT assembly processes?
Yes, SMAJ4758E3/TR13 uses the DO-214AC (SMAJ) package with a flat handling surface optimized for accurate pick-and-place placement. It supports reflow soldering at 260 °C for 10 seconds and meets MIL-STD-750 Method 2026 solderability requirements, making it fully compatible with high-volume SMT lines.
What is the maximum steady-state power dissipation for SMAJ4758E3/TR13?
The SMAJ4758E3/TR13 has a steady-state power dissipation rating of 2.0 W when mounted on 4.0 mm² copper pads per terminal. Power must be linearly derated above 100 °C ambient, reaching zero at 150 °C, as defined in Note 3 of the datasheet MSC0284A.
How does the knee impedance of SMAJ4758E3/TR13 affect its regulation performance?
The SMAJ4758E3/TR13 has a maximum knee impedance (ZZK) of 2000 Ω at IZK = 0.25 mA, indicating a well-defined breakdown transition. This ensures stable low-current regulation and minimizes output voltage drift during light-load conditions in reference or bias applications.
Can SMAJ4758E3/TR13 replace 1N4758A in existing designs?
Yes, SMAJ4758E3/TR13 is electrically equivalent to 1N4758A per the datasheet, sharing identical zener voltage (56 V ±5%), test current (4.5 mA), and power rating (2 W). However, the DO-214AC surface-mount package requires PCB layout changes versus the DO-41 through-hole footprint of 1N4758A.
SMAJ4758E3/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):
- 56 V
- Tolerance:
- ±10%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 110 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 42.6 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
SMAJ4758E3/TR13 FAQ
1.How can I place an order for SMAJ4758E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4758E3/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 SMAJ4758E3/TR13 reliable?
The price and inventory of SMAJ4758E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4758E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4758E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4758E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4758E3/TR13?
SMAJ4758E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4758E3/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 SMAJ4758E3/TR13?
For technical support, including SMAJ4758E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4758E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4758E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4758E3/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 SMAJ4758E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4758E3/TR13?
All SMAJ4758E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4758E3/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 SMAJ4758E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4758E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4758E3/TR13 Tags
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