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Microchip Technology 1N5368A/TR8
- Part No.:
- 1N5368A/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5368A/TR8.pdf
- Description:
- DIODE ZENER 47V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:3,637
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Product details
Overview
1N5368A/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 47 V, ±10% tolerance (A suffix), 25 Ω maximum dynamic impedance at 25 mA test current, and 210 mA maximum Zener current when adequately heat-sunk. It operates from –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in industrial power supplies.
For engineers reviewing the 1N5368A/TR8 datasheet, 1N5368A/TR8 pinout, 1N5368A/TR8 application, or 1N5368A/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (210 A), reverse leakage performance at 35.8 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. Its regulation stability relies on low dynamic impedance (25 Ω @ 25 mA) and tight voltage regulation (ΔVZ = 2.7 V between 10% and 50% of IZM), enabling stable reference generation across varying load currents.
The 1N5368A/TR8 uses a void-free thermosetting epoxy T-18 package with cathode band marking, rated for 5 W steady-state dissipation at 25 °C lead temperature (3/8″ from body), and exhibits 0.5 μA maximum reverse leakage at VR = 35.8 V - critical for low-power biasing and sensing circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V nominal, ±10% tolerance - defines regulated output voltage under specified test conditions |
| Test Current (IZT) | 25 mA - current at which VZ is measured; sets baseline operating point for regulation |
| Dynamic Impedance (ZZ) | 25 Ω max @ IZT - determines voltage deviation under load transients |
| Max Reverse Leakage (IR) | 0.5 μA @ 35.8 V - ensures minimal quiescent current in standby or high-impedance bias networks |
| Max Zener Current (IZM) | 210 mA @ TL = 25 °C - peak continuous DC current before thermal runaway with proper heatsinking |
| Surge Current (IZSM) | 210 A (8.3 ms half-sine) - withstands transient overvoltage events without failure |
| Voltage Regulation (ΔVZ) | 2.7 V - difference between VZ at 10% and 50% of IZM; quantifies regulation linearity |
Pinout & Package
Package: Axial-leaded T-18 plastic encapsulated case with cathode indicated by colored band; moisture sensitivity level 1 (no dry pack required); RoHS-compliant matte-tin plating; weight 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower-potential rail; forms return path during Zener operation |
| Cathode | Zener breakdown terminal / Regulated output node | Banded end; connected to unregulated input; maintains 47 V relative to anode under reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Ensures standardized electrical behavior and interchangeability across qualified suppliers |
| ±10% voltage tolerance (A suffix) | Provides cost-optimized regulation accuracy suitable for non-critical reference and clamping |
| 25 °C/W junction-to-lead thermal resistance | Enables 5 W power dissipation with modest heatsinking - e.g., 3/8″ lead length from body |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for special handling during assembly; improves manufacturing yield |
| RoHS-compliant (e3 suffix) | Meets global environmental compliance requirements without performance trade-offs |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing feedback reference in isolated DC-DC converter secondary-side error amplifiers. IC Role / Device Role / Timing Role: Voltage reference element providing fixed 47 V threshold for optocoupler-driven regulation loop. Use Value: Maintains ±10% output voltage accuracy across line/load variations and temperature drift up to +150 °C. | Use Scenario: Protecting microcontroller I/O pins from transient surges on 48 V bus interfaces. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage to 47 V + forward drop during ESD or inductive kick events. Use Value: Absorbs 210 A surge (8.3 ms) without degradation, preserving downstream logic integrity. |
| Programmable Current Source Bias | Temperature-Stable Reference Generator |
Use Scenario: Setting constant current in LED driver bias networks using 47 V Zener + series resistor. IC Role / Device Role / Timing Role: Precision voltage source establishing known voltage drop across sense resistor. Use Value: Delivers <1% current variation over –65 °C to +150 °C due to low ΔVZ (2.7 V) and stable ZZ. | Use Scenario: Generating stable analog reference for ADC front-end in harsh-environment sensor modules. IC Role / Device Role / Timing Role: Primary voltage reference with minimal drift under thermal cycling. Use Value: Achieves <0.5 μA leakage at 35.8 V, reducing reference loading error in high-impedance divider networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5368B/TR8 | ±5% tolerance (B suffix) vs. ±10% (A suffix); identical VZ, IZT, ZZ, and package | Higher regulation accuracy required for precision references; tighter tolerance increases cost | Select 1N5368B/TR8 when reference stability >±5% is mandatory; otherwise 1N5368A/TR8 offers cost advantage |
| MMBZ5268BS-7-F | Surface-mount SOD-123 package; 47 V, ±5%; 200 mW rating vs. 5 W; ZZ = 45 Ω @ 20 mA | Low-power, space-constrained PCBs where thermal mass and surge immunity are secondary | Choose MMBZ5268BS-7-F only for board-level signal conditioning; not suitable for power regulation or surge clamping |
Compared with 1N5368B/TR8, the 1N5368A/TR8 trades regulation accuracy for cost and remains compatible in non-critical clamping roles; versus MMBZ5268BS-7-F, it delivers 25× higher power handling and superior surge robustness but requires axial through-hole mounting.
Availability
1N5368A/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, programmable current sources, and temperature-stable reference generators requiring stable component supply and long-term obsolescence management.
Supply support for 1N5368A/TR8 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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xxA/B series was designed for ruggedized voltage regulation in demanding environments - emphasizing wide temperature range (–65 °C to +150 °C), high surge survivability, and JEDEC-standardized performance.
FAQ
What is the Zener voltage tolerance of the 1N5368A/TR8?
The 1N5368A/TR8 has a nominal Zener voltage of 47 V with a tolerance of ±10%, as indicated by the "A" suffix per Microsemi's documentation. This tolerance applies across the full operating temperature range of –65 °C to +150 °C and is verified at 25 °C lead temperature with 25 mA test current. The 1N5368A/TR8 is not rated for tighter tolerances unless re-screened.
Can the 1N5368A/TR8 be used in surface-mount designs?
No - the 1N5368A/TR8 is an axial-leaded T-18 package device intended for through-hole mounting. For surface-mount equivalents, Microsemi offers the SMBJ5368B or SMBG5368B in DO-214AA (SMB) packages. These share the same 47 V rating and ±5% tolerance but differ in thermal performance, surge rating, and footprint - the 1N5368A/TR8 cannot be substituted without PCB redesign.
What is the maximum power dissipation of the 1N5368A/TR8 at 75 °C ambient?
At 75 °C ambient temperature on an FR4 board (1 oz Cu, 4 mm² pads), the 1N5368A/TR8 derates to approximately 2.8 W based on its 85 °C/W junction-to-ambient thermal resistance and 5 W rating at 25 °C. Derating follows linear interpolation per Figure 1 in the datasheet; exceeding this limit risks thermal runaway. For full 5 W operation, lead temperature must remain ≤25 °C via heatsinking.
Does the 1N5368A/TR8 meet RoHS requirements?
Yes - the 1N5368A/TR8 carries the "e3" suffix in its full ordering designation (e.g., 1N5368A/TR8 e3), confirming RoHS compliance per EU Directive 2011/65/EU. Its terminals feature annealed matte-tin plating compliant with MIL-STD-750 Method 2026, and the void-free epoxy body meets UL94V-0 flammability standards.
How does the 1N5368A/TR8 compare to the 1N4747A in terms of performance?
The 1N5368A/TR8 and 1N4747A both regulate at 47 V, but the 1N5368A/TR8 delivers 5 W power handling (vs. 1 W for 1N4747A), 210 mA IZM (vs. 41 mA), and 210 A surge rating (vs. 12 A). Its dynamic impedance is 25 Ω vs. 15 Ω for the 1N4747A, reflecting different optimization priorities - the 1N5368A/TR8 prioritizes robustness, while the 1N4747A favors low-Z reference use.
1N5368A/TR8 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:
- ±10%
- 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
1N5368A/TR8 FAQ
1.How can I place an order for 1N5368A/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5368A/TR8 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 1N5368A/TR8 reliable?
The price and inventory of 1N5368A/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5368A/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5368A/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5368A/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5368A/TR8?
1N5368A/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5368A/TR8 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 1N5368A/TR8?
For technical support, including 1N5368A/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5368A/TR8 requirements.
6.How does Aetrix verify that 1N5368A/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5368A/TR8 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 1N5368A/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5368A/TR8?
All 1N5368A/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5368A/TR8, 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 1N5368A/TR8 part is unused and in its original packaging.
Return procedure for 1N5368A/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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