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Microchip Technology 1N5367B/TR8
- Part No.:
- 1N5367B/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5367B/TR8.pdf
- Description:
- DIODE ZENER 43V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:3,299
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Product details
Overview
1N5367B/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 43 V, ±5% tolerance (B suffix), 30 mA test current (IZT), 20 Ω dynamic impedance (ZZ), and maximum reverse current of 0.5 μA at 32.7 V (VR). 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 1N5367B/TR8 datasheet, 1N5367B/TR8 pinout, 1N5367B/TR8 application, or 1N5367B/TR8 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (190 A), voltage regulation (ΔVZ = 2.8 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 Zener voltage is specified at 43 V ±5% under 30 mA DC test current (IZT) at TL = 25°C, with dynamic impedance measured at 1 kHz AC superimposed on IZT.
It exhibits low voltage regulation (ΔVZ = 2.8 V between 10% and 50% of IZM), minimal knee impedance (ZZK = 110 Ω at 1.0 mA), and withstands non-recurrent 8.3 ms half-sine surge currents up to 190 A - enabled by its 5 W steady-state power rating and 25 °C/W junction-to-lead thermal resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V ±5% - precise regulation point for feedback networks requiring stable reference under varying load |
| Test Current (IZT) | 30 mA - defined operating point where VZ and ZZ are guaranteed; sets minimum bias requirement |
| Dynamic Impedance (ZZ) | 20 Ω - low AC impedance ensures minimal output voltage variation with current transients |
| Max Reverse Current (IR) | 0.5 μA at VR = 32.7 V - confirms sharp knee and low leakage below regulation threshold |
| Power Dissipation | 5.0 W at TL < 25°C (3/8″ lead length) - requires heatsinking for sustained high-current operation |
| Thermal Resistance | 25 °C/W junction-to-lead - enables direct thermal path to PCB copper or chassis for thermal management |
| Voltage Regulation (ΔVZ) | 2.8 V - difference between VZ at 10% and 50% of IZM; quantifies regulation linearity across operating range |
| Surge Current (IZSM) | 190 A (8.3 ms half-sine) - supports transient overvoltage clamping without failure |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by band; leads plated with RoHS-compliant annealed matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to circuit ground or lower-potential node; reverse-biased operation requires cathode at higher potential |
| Cathode | Zener breakdown terminal | Banded end; must be held at higher voltage than anode to enter regulation; serves as stable voltage reference node |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N53xxB series | Industry-standard footprint and electrical behavior enabling drop-in replacement across multiple vendors |
| Moisture sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out before assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Robust handling in standard manufacturing environments without special ESD controls |
| RoHS-compliant (e3 suffix) | Lead-free matte-tin plating meets environmental compliance without sacrificing solderability |
| High surge current capability | 190 A peak (8.3 ms) enables reliable transient suppression in industrial power rails |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Provides stable 43 V reference to TL431-like shunt regulator or discrete error amplifier input. Use Value: Tight ±5% tolerance and low ΔVZ (2.8 V) ensure output accuracy within ±1.5% over line/load/temperature. | Use Scenario: Clamps transient spikes on 48 V telecom or industrial DC bus lines during load dump or inductive switching. IC Role / Device Role / Timing Role: Acts as passive crowbar element, conducting only when bus exceeds 43 V + margin. Use Value: 190 A surge rating and 5 W dissipation allow single-device protection without external current limiting. |
| Programmable Voltage Reference | DC Link Voltage Monitor |
Use Scenario: Sets threshold for comparator-based undervoltage lockout (UVLO) or brownout detection in battery-powered systems. IC Role / Device Role / Timing Role: Delivers fixed 43 V reference to comparator input; anode grounded, cathode tied to sensing node. Use Value: Low IR (0.5 μA) and stable VZ minimize quiescent current and drift in low-power monitoring circuits. | Use Scenario: Monitors DC link voltage in motor drives or inverters to trigger shutdown if >43 V is exceeded. IC Role / Device Role / Timing Role: Serves as analog threshold detector in conjunction with resistor divider and comparator. Use Value: 25 °C/W thermal resistance allows direct mounting to heatsink, maintaining accuracy during prolonged overvoltage events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5367BRLG (ON Semiconductor) | Same 43 V ±5%, 5 W rating, but TO-204AA (DO-41) package; thermal resistance 30 °C/W junction-to-ambient vs. 25 °C/W junction-to-lead for 1N5367B/TR8 | Less effective heat transfer in lead-mounted configurations; requires larger PCB copper area for equivalent power handling | Select 1N5367B/TR8 when lead-heat-sinking is preferred; choose 1N5367BRLG for legacy DO-41 board compatibility |
| MMBZ5267BS (Diodes Inc.) | Surface-mount SOD-123 package; same 43 V ±5%, but rated at 500 mW - not a power-equivalent replacement | Only suitable for low-current reference or signal-level clamping; cannot replace 1N5367B/TR8 in 5 W applications | Use MMBZ5267BS only in space-constrained, low-power designs; 1N5367B/TR8 remains required for full 5 W regulation duty |
Compared with 1N5367BRLG and MMBZ5267BS, the 1N5367B/TR8 offers superior thermal performance in axial-lead mounting, verified 5 W continuous dissipation, and JEDEC-standardized mechanical interface - making it the preferred choice for industrial power supply and protection circuits demanding reliability and thermal headroom.
Availability
1N5367B/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and programmable voltage references requiring stable component supply and long-term manufacturability.
Supply support for 1N5367B/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 1N53xxB series was designed for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and JEDEC-standardized interchangeability.
FAQ
What is the Zener voltage tolerance of the 1N5367B/TR8?
The 1N5367B/TR8 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix in its part number. This means its regulated voltage falls within 40.85 V to 45.15 V at 30 mA test current and 25°C lead temperature. The tolerance is guaranteed across the full operating temperature range of –65°C to +150°C, and applies to all units in the production lot without binning.
Can the 1N5367B/TR8 be used in surface-mount designs?
No, the 1N5367B/TR8 is an axial-leaded T-18 package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5367B or SMBG5367B in DO-214AA (SMB) packages. These share identical electrical specifications (43 V ±5%, 5 W) but require requalification of thermal layout and solder profile due to different package geometry and thermal paths.
What is the maximum surge current rating for the 1N5367B/TR8?
The 1N5367B/TR8 is rated for a maximum non-recurrent surge current (IZSM) of 190 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating assumes proper lead mounting and adequate PCB copper area for heat spreading. Exceeding this value, even briefly, risks irreversible junction damage due to localized thermal runaway.
How does the thermal resistance of the 1N5367B/TR8 affect PCB layout?
The 1N5367B/TR8 has a junction-to-lead thermal resistance of 25 °C/W when leads are trimmed to 10 mm (3/8″) from the body. To maintain safe junction temperature, PCB traces connected to its leads must provide low-thermal-resistance paths - typically achieved using ≥4 mm² copper pads and ≥1 mm wide, 25 mm long traces. Mounting directly to a metal chassis further improves heat dissipation.
Is the 1N5367B/TR8 RoHS compliant?
Yes, the 1N5367B/TR8 is RoHS compliant, as confirmed by the "e3" designation in its full manufacturer part number (1N5367B/TR8 e3). Its leads feature annealed matte-tin plating per MIL-STD-750 Method 2026, and its void-free epoxy body meets UL94V-0 flammability requirements - satisfying both environmental and safety standards for modern electronics manufacturing.
1N5367B/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):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 31 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
1N5367B/TR8 FAQ
1.How can I place an order for 1N5367B/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5367B/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 1N5367B/TR8 reliable?
The price and inventory of 1N5367B/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5367B/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5367B/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5367B/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5367B/TR8?
1N5367B/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5367B/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 1N5367B/TR8?
For technical support, including 1N5367B/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5367B/TR8 requirements.
6.How does Aetrix verify that 1N5367B/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5367B/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 1N5367B/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5367B/TR8?
All 1N5367B/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5367B/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 1N5367B/TR8 part is unused and in its original packaging.
Return procedure for 1N5367B/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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