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Microchip Technology 1N5368B/TR12
- Part No.:
- 1N5368B/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5368B/TR12.pdf
- Description:
- DIODE ZENER 47V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:7,905
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Product details
Overview
1N5368B/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 47 V, ±5% tolerance (B suffix), 25 Ω maximum dynamic impedance at 25 mA test current, and 210 mA maximum Zener current when adequately heat-sunk. It regulates voltage across wide current and temperature ranges in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N5368B/TR12 datasheet, 1N5368B/TR12 pinout, 1N5368B/TR12 application, or 1N5368B/TR12 equivalent, key selection criteria include its 47 V Zener voltage, 5 W steady-state power rating at 25 °C lead temperature, ±5% tolerance, low 25 Ω dynamic impedance, and axial T-18 package compatibility with through-hole PCB mounting.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown to maintain stable output voltage under varying load and line conditions. Its regulation performance is defined by ΔVZ = 2.7 V (difference between voltages at 10% and 50% of IZM) and ZZK = 0.80 Ω at 1 mA knee current.
Designed for high-reliability DC voltage stabilization, it supports operation from –65 °C to +150 °C, exhibits 0.5 μA maximum reverse leakage at VR = 35.8 V, and withstands non-recurrent 8.3 ms half-sine surge currents up to 210 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V nominal, ±5% tolerance - ensures stable reference within 44.65–49.35 V at 25 °C lead temperature |
| Test Current (IZT) | 25 mA - defines operating point where VZ and dynamic impedance are specified |
| Dynamic Impedance (ZZ) | 25 Ω max at IZT - limits voltage variation under changing load current |
| Max Zener Current (IZM) | 210 mA - maximum continuous reverse current before thermal failure, assuming adequate heat sinking |
| Power Dissipation | 5.0 W at TL = 25 °C (3/8″ lead length) - sets thermal design boundary for PCB layout and heatsinking |
| Reverse Leakage (IR) | 0.5 μA max at VR = 35.8 V - ensures minimal standby power loss in high-impedance bias networks |
| Voltage Regulation (ΔVZ) | 2.7 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
Pinout & Package
Package: Axial-leaded T-18 plastic case per JEDEC DO-204AL standard; cathode indicated by color band; RoHS-compliant matte-tin plating; 0.7 g weight; moisture sensitivity level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Reverse breakdown terminal / regulated output side | Banded end; connected to unregulated input; delivers stable 47 V reference to load |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Ensures standardized mechanical dimensions and electrical behavior across global suppliers |
| ±5% voltage tolerance (B suffix) | Provides tighter regulation than ±10% (A) or ±20% (no suffix) variants for precision references |
| Low 25 Ω dynamic impedance | Minimizes output voltage shift under load transients in feedback and sensing circuits |
| 210 A surge current rating | Withstands 8.3 ms half-sine surges without degradation-critical for transient suppression |
| Level 1 moisture sensitivity | Eliminates baking requirement prior to reflow, reducing assembly cost and process risk |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in the optocoupler feedback path of isolated DC-DC converters to regulate output voltage against line/load variations. IC Role / Device Role / Timing Role: Zener reference element providing precise 47 V threshold for TL431 or similar shunt regulator control. Use Value: Maintains ±1% output regulation accuracy over –40 °C to +125 °C due to tight 47 V ±5% tolerance and low ΔVZ. | Use Scenario: Placed across sensitive IC inputs or bus lines to clamp transient overvoltages exceeding 47 V. IC Role / Device Role / Timing Role: Two-terminal passive clamping device absorbing energy during ESD or lightning-induced surges. Use Value: Sustains 210 A peak surge current without failure, protecting downstream logic from >35.8 V transients per IEC 61000-4-5. |
| Programmable Voltage Reference | Industrial Sensor Excitation |
Use Scenario: Combined with resistive dividers to generate stable mid-rail or custom reference voltages for ADCs and DACs. IC Role / Device Role / Timing Role: Primary voltage reference source delivering 47 V with <2.7 V regulation spread across operating current range. Use Value: Enables 12-bit system accuracy by limiting reference drift to <0.1% FS over temperature and current variation. | Use Scenario: Supplies constant 47 V excitation to high-resistance strain gauges or RTDs in harsh industrial environments. IC Role / Device Role / Timing Role: Precision current-limiting reference node maintaining fixed voltage despite sensor resistance changes. Use Value: Delivers stable excitation with <0.5 μA leakage, preventing measurement offset errors in microamp-level bridge circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5368B (bulk) | Identical electrical specs; differs only in packaging-TR12 denotes tape-and-reel (EIA-296), while bulk lacks reel packaging | No functional difference; TR12 enables automated pick-and-place assembly, bulk requires manual or vibration-feed handling | Select 1N5368B/TR12 for SMT production lines requiring reel-fed placement; choose bulk for prototyping or low-volume hand assembly |
| MMBZ5268B (SOT-23) | Same 47 V ±5% rating but 0.35 W power rating, 30 Ω ZZ, and surface-mount SOT-23 package | Not suitable for 5 W dissipation; limited to low-power bias/reference roles where board space is constrained | Choose MMBZ5268B only when thermal budget and footprint prohibit axial devices; not a drop-in replacement for 1N5368B/TR12 |
Compared with 1N5368B/TR12, the bulk variant offers identical regulation performance but no tape-and-reel convenience, while MMBZ5268B trades power capability for miniaturization-making 1N5368B/TR12 the sole choice for robust 5 W through-hole Zener regulation.
Availability
1N5368B/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, programmable voltage references, and industrial sensor excitation requiring stable component supply and long-term obsolescence management.
Supply support for 1N5368B/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized 5 W axial Zener regulation in mission-critical power systems where thermal stability, surge resilience, and long-term parameter consistency are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N5368B/TR12?
The 1N5368B/TR12 has a ±5% Zener voltage tolerance, as indicated by the "B" suffix per Microsemi's documentation. This means its actual breakdown voltage falls between 44.65 V and 49.35 V when measured at 25 °C lead temperature and 25 mA test current. The tolerance is tighter than the ±10% "A" suffix or ±20% no-suffix variants, making the 1N5368B/TR12 suitable for applications demanding higher reference precision.
Can the 1N5368B/TR12 be used in surface-mount designs?
No, the 1N5368B/TR12 is an axial-leaded T-18 package device intended for through-hole mounting. It is not compatible with surface-mount assembly processes. For SMT equivalents, Microsemi offers the SMBJ5368B (DO-214AA) and SMBG5368B (DO-214AB) packages, which share identical electrical specifications but differ mechanically. The 1N5368B/TR12 itself requires hole drilling and wave or selective soldering.
What is the maximum surge current rating for the 1N5368B/TR12?
The 1N5368B/TR12 is rated for a maximum non-recurrent surge current (IZSM) of 210 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating reflects its ability to absorb transient energy without parametric shift or catastrophic failure. The surge capability is enabled by its 5 W power structure and low thermal resistance (25 °C/W junction-to-lead), making the 1N5368B/TR12 appropriate for clamping applications in industrial power systems.
How does the 1N5368B/TR12 perform at elevated temperatures?
The 1N5368B/TR12 is rated for operation from –65 °C to +150 °C, with Zener voltage exhibiting predictable positive temperature coefficient above ~5 V. At 100 °C ambient, its power derating reduces maximum dissipation to approximately 3.5 W (per Figure 1). Its regulation remains stable due to low ΔVZ = 2.7 V and minimal voltage drift-critical for automotive and industrial environments where the 1N5368B/TR12 maintains reference integrity across thermal cycling.
Is the 1N5368B/TR12 RoHS compliant?
Yes, the 1N5368B/TR12 is RoHS compliant, as confirmed by the "e3" designation in Microsemi's official documentation. The device uses annealed matte-tin plating on leads and void-free UL94V-0 epoxy encapsulation, meeting EU Directive 2011/65/EU requirements. No lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE substances exceed allowable thresholds, and the 1N5368B/TR12 carries full compliance documentation for export and industrial certification.
1N5368B/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:
- ±5%
- 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
1N5368B/TR12 FAQ
1.How can I place an order for 1N5368B/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5368B/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 1N5368B/TR12 reliable?
The price and inventory of 1N5368B/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5368B/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5368B/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5368B/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5368B/TR12?
1N5368B/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5368B/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 1N5368B/TR12?
For technical support, including 1N5368B/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5368B/TR12 requirements.
6.How does Aetrix verify that 1N5368B/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5368B/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 1N5368B/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5368B/TR12?
All 1N5368B/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5368B/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 1N5368B/TR12 part is unused and in its original packaging.
Return procedure for 1N5368B/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5368B/TR12 Tags
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