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Microchip Technology 1N5368E3/TR12
- Part No.:
- 1N5368E3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5368E3/TR12.pdf
- Description:
- DIODE ZENER 47V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,391
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Product details
Overview
1N5368E3/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 47 V, ±5% tolerance (B-suffix equivalent), 25 Ω dynamic impedance at 25 mA test current, and maximum reverse current of 0.5 μA at 35.8 V. It operates from –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5368E3/TR12 datasheet, 1N5368E3/TR12 pinout, 1N5368E3/TR12 application, or 1N5368E3/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (210 A), voltage regulation (ΔVZ = 2.7 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown mode. Its Zener voltage is specified at 25 °C with 40 ±10 ms DC current application, and its dynamic impedance is measured using 1 kHz AC modulation at 10% of IZT.
Thermal performance is defined for two mounting conditions: junction-to-lead (25 °C/W at 10 mm lead length) and junction-to-ambient (85 °C/W on FR4 with 4 mm² copper pads). The cathode is marked by a band, requiring the banded end to be biased positive relative to the anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V ±5% - stable regulation point for feedback networks requiring tight voltage setpoint accuracy |
| Test Current (IZT) | 25 mA - standard bias condition for measuring VZ and ZZ, enabling repeatable validation across production lots |
| Dynamic Impedance (ZZ) | 25 Ω - low AC impedance ensures minimal output voltage variation under changing load currents |
| Max Reverse Current (IR) | 0.5 μA at 35.8 V - confirms sharp knee and low leakage below regulation threshold |
| Power Dissipation (PD) | 5.0 W at TL = 25 °C - supports high-current regulation when mounted with adequate heat sinking |
| Voltage Regulation (ΔVZ) | 2.7 V - difference between VZ measured at 10% and 50% of IZM, indicating line regulation capability |
| Surge Current (IZSM) | 210 A (8.3 ms half-sine) - withstands transient overvoltage events without degradation |
Pinout & Package
Package: Axial-leaded T-18 molded epoxy case (UL94V-0), moisture sensitivity level 1, no dry pack required. Cathode identified by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased current sink terminal | Connected to lower-potential node in shunt regulator configuration; carries full load current during regulation |
| Cathode | Regulated output reference terminal | Banded end; held at precise 47 V above anode; serves as stable voltage reference for error amplifiers or comparators |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant matte-tin plating | Solderable per MIL-STD-750 Method 2026, compatible with lead-free reflow up to 260 °C for 10 s |
| Low thermal resistance (25 °C/W) | Enables 5 W operation with minimal temperature rise when leads are heat-sunk at 10 mm from body |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for special handling or grounding protocols during board assembly |
| Stable voltage regulation over –65 °C to +150 °C | Validated for use in automotive engine compartments and industrial motor drives without derating |
| JEDEC-registered 1N53xx series | Guarantees mechanical and electrical interchangeability across qualified manufacturers |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Shunt reference providing precise 47 V threshold to TL431-like control ICs or discrete transistor comparators. Use Value: Maintains ±1% output regulation across line/load/temperature with ΔVZ = 2.7 V and ZZ = 25 Ω. | Use Scenario: Clamps transient spikes on 48 V DC bus lines in telecom rectifier modules. IC Role / Device Role / Timing Role: Two-terminal crowbar element absorbing surge energy before downstream MOSFETs or controllers fail. Use Value: Withstands 210 A (8.3 ms) surges while holding clamp voltage ≤49.7 V (VZ + ΔVZ). |
| Programmable Voltage Reference | Industrial Sensor Excitation |
Use Scenario: Sets reference voltage for DAC output buffers in programmable logic controller (PLC) analog outputs. IC Role / Device Role / Timing Role: Precision shunt reference replacing higher-cost bandgap ICs where 47 V excitation is required. Use Value: Delivers 47 V ±5% with <0.5 μA leakage at 35.8 V, minimizing current-source loading error. | Use Scenario: Supplies stable excitation voltage to 4–20 mA current-loop pressure transmitters in oil & gas field instruments. IC Role / Device Role / Timing Role: Primary voltage source for Wheatstone bridge biasing in harsh-environment sensors. Use Value: Operates continuously from –65 °C to +150 °C with no parameter drift beyond spec, ensuring calibration integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5368B | Same 47 V ±5%, identical electrical specs, but SnPb plating instead of RoHS-compliant matte tin | Not suitable for lead-free assembly; requires different solder profile and flux chemistry | Select 1N5368B only if legacy SnPb process is mandated and RoHS exemption applies |
| MMBZ5270B (ON Semiconductor) | Surface-mount SOD-123 package, 47 V ±5%, 0.5 W rating, ZZ = 35 Ω at 10 mA | Lower power and higher impedance limit use to low-current references; not interchangeable in 5 W designs | Choose MMBZ5270B only for space-constrained PCBs where 500 mW max dissipation suffices |
Compared with 1N5368B and MMBZ5270B, the 1N5368E3/TR12 uniquely combines 5 W power handling, axial-leaded through-hole mounting, RoHS compliance, and JEDEC-standardized T-18 package-making it optimal for industrial power supplies requiring field-replaceable, high-surge-capable Zeners.
Availability
1N5368E3/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and programmable voltage references requiring stable component supply across extended temperature ranges and high-reliability manufacturing.
Supply support for 1N5368E3/TR12 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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N53xx series was designed specifically for robust, high-power voltage regulation in mission-critical power systems where thermal stability, surge immunity, and long-term parametric consistency are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N5368E3/TR12?
The 1N5368E3/TR12 has a Zener voltage tolerance of ±5%, consistent with the "B" suffix in the 1N53xx family. This is confirmed in the Electrical Characteristics table where 1N5368B (identical electrical specs) is listed with VZ = 47 V and tolerance noted as ±5%. The "E3" suffix denotes RoHS compliance but does not alter voltage tolerance.
Does the 1N5368E3/TR12 require dry packing per J-STD-020?
No, the 1N5368E3/TR12 has moisture sensitivity level 1 per IPC/JEDEC J-STD-020B, meaning it is not moisture-sensitive and does not require dry packing or baking prior to assembly. This is explicitly stated in the Features section of the datasheet.
What is the maximum steady-state power dissipation for the 1N5368E3/TR12 on a standard FR4 PCB?
When mounted on FR4 with 1 oz copper, 4 mm² pads, and 1 mm × 25 mm traces, the 1N5368E3/TR12 has a steady-state power rating of 1.47 W at TA = 25 °C. This is derived from its 85 °C/W junction-to-ambient thermal resistance and is documented in the Maximum Ratings section.
Can the 1N5368E3/TR12 be used in place of the 1N5368B in existing designs?
Yes, the 1N5368E3/TR12 is a direct replacement for 1N5368B in terms of electrical specifications, thermal performance, and mechanical dimensions. The only difference is RoHS-compliant matte-tin plating versus SnPb plating-requiring verification of solder process compatibility but no PCB layout change.
What is the forward voltage specification for the 1N5368E3/TR12?
The forward voltage of the 1N5368E3/TR12 is specified as ≤1.2 V at 1.0 A forward current. This value is listed in the Maximum Ratings table and applies to conduction in forward bias-relevant for polarity protection or reverse-connection fault analysis.
1N5368E3/TR12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 47 V
- Tolerance:
- ±20%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 33.8 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 1 A
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- T-18
1N5368E3/TR12 FAQ
1.How can I place an order for 1N5368E3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5368E3/TR12 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 1N5368E3/TR12 reliable?
The price and inventory of 1N5368E3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5368E3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5368E3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5368E3/TR12 transactions.
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4.How is shipping managed for 1N5368E3/TR12?
1N5368E3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5368E3/TR12 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 1N5368E3/TR12?
For technical support, including 1N5368E3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5368E3/TR12 requirements.
6.How does Aetrix verify that 1N5368E3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5368E3/TR12 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 1N5368E3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5368E3/TR12?
All 1N5368E3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5368E3/TR12, 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 1N5368E3/TR12 part is unused and in its original packaging.
Return procedure for 1N5368E3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5368E3/TR12 Tags
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