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Microchip Technology 1N5344/TR8
- Part No.:
- 1N5344/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5344/TR8.pdf
- Description:
- DIODE ZENER 8.2V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,871
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Product details
Overview
1N5344/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 8.2 V, ±5% tolerance (B-suffix), 150 mA maximum Zener current (IZM), 1.5 Ω dynamic impedance (ZZ) at 150 mA test current, and operates from –65 °C to +150 °C - used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5344/TR8 datasheet, 1N5344/TR8 pinout, 1N5344/TR8 application, or 1N5344/TR8 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (10 A), low voltage regulation drift (ΔVZ = 0.20 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This discrete Zener diode functions as a two-terminal shunt voltage regulator, maintaining stable output voltage across wide operating current (150 mA max) and temperature ranges (–65 °C to +150 °C). Its low 25 °C/W thermal resistance enables high-power operation with minimal lead-length heat sinking (3/8″ from body).
It exhibits tight voltage regulation (ΔVZ = 0.20 V between 10% and 50% IZM), low dynamic impedance (1.5 Ω at IZT = 150 mA), and robust surge capability (10 A peak, 8.3 ms half-sine), making it suitable for transient suppression and reference stability in industrial DC-DC converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2 V ±5% - defines precise clamping threshold for feedback or protection circuits |
| Power Dissipation | 5.0 W at TL = 25 °C - supports high-current regulation when lead-heatsinked |
| Zener Test Current (IZT) | 150 mA - operating point where VZ and ZZ are specified; sets bias design point |
| Dynamic Impedance (ZZ) | 1.5 Ω - low AC resistance ensures minimal voltage shift under load transients |
| Max Surge Current (IZSM) | 10 A (8.3 ms half-sine) - withstands common line surges without degradation |
| Voltage Regulation (ΔVZ) | 0.20 V - difference between VZ at 10% and 50% of IZM; indicates regulation linearity |
| Junction-to-Lead Thermal Resistance | 25 °C/W - enables reliable 5 W operation with only 3/8″ lead length as heatsink |
Pinout & Package
Package: Axial-leaded T-18 plastic case (Void-free UL94V-0 epoxy), cathode indicated by band; leads plated with annealed matte tin (RoHS compliant, solderable per MIL-STD-750 Method 2026); weight: 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias; grounded or low-side reference node in shunt regulator | Connected to circuit ground or return path; reverse-biased operation requires anode at lower potential than cathode |
| Cathode | Current exit terminal during reverse breakdown; regulated voltage node | Banded end; connected to voltage rail being regulated; establishes stable 8.2 V reference relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with industry-standard 1N53xxB mechanical and electrical specifications for interchangeability |
| Moisture Sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out before assembly |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - safe for standard handling without special ESD controls |
| High surge current rating | 10 A peak (8.3 ms) - protects downstream circuitry against common-mode transients in industrial environments |
| Stable regulation over temperature | Operates continuously from –65 °C to +150 °C - suitable for under-hood automotive and outdoor power systems |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converter feedback loop via optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 8.2 V threshold to control PWM duty cycle. Use Value: Maintains ±1.5% output regulation across line/load/temperature with ΔVZ = 0.20 V and low ZZ = 1.5 Ω. |
Use Scenario: Clamps 12 V rail against load-dump transients in automotive ECUs. IC Role / Device Role / Timing Role: Two-terminal shunt protector diverting surge current above 8.2 V to ground. Use Value: Withstands 10 A (8.3 ms) surge without failure and recovers regulation within 100 ns after transient. |
| Industrial Sensor Reference | Programmable Logic Controller Input Conditioning |
Use Scenario: Provides stable excitation voltage for 4–20 mA current-loop pressure transducers. IC Role / Device Role / Timing Role: Precision voltage reference sourcing constant current through sensor bridge. Use Value: Delivers 8.2 V ±5% with <0.20 V regulation drift over –40 °C to +85 °C ambient. |
Use Scenario: Limits input voltage to PLC digital input stage exposed to 24 V field wiring. IC Role / Device Role / Timing Role: Front-end clamp protecting Schmitt-trigger input from overvoltage faults. Use Value: Activates at 8.2 V with fast turn-on (tens of ns), limiting input to safe levels before IC damage occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5344B | Same 8.2 V ±5%, but in bulk (non-tape-and-reel) packaging; no TR8 suffix | Requires manual loading; unsuitable for automated SMT placement | Select 1N5344/TR8 for reel-fed pick-and-place; choose 1N5344B for prototyping or low-volume hand assembly |
| MMBZ5231BS | Surface-mount SOD-123 package; same 8.2 V ±5%, but lower 0.5 W rating and higher ZZ (7 Ω) | Limited to low-power signal-level clamping; cannot replace 1N5344/TR8 in 5 W power regulation | Use MMBZ5231BS only in space-constrained, low-current applications; retain 1N5344/TR8 for power-stage regulation |
Compared with 1N5344B and MMBZ5231BS, the 1N5344/TR8 uniquely combines 5 W power handling, axial-leaded manufacturability, JEDEC-standardized form factor, and proven surge robustness - making it the preferred choice for industrial power supply and protection designs requiring reliability and traceable sourcing.
Availability
1N5344/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, automotive control units, and programmable logic controller input protection requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for 1N5344/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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized voltage regulation in harsh-environment power systems - emphasizing thermal stability, surge resilience, and JEDEC-standardized interchangeability across military and commercial applications.
FAQ
What is the Zener voltage tolerance of the 1N5344/TR8?
The 1N5344/TR8 has a nominal Zener voltage of 8.2 V with ±5% tolerance, as indicated by the "B" suffix in its full designation. This means the actual measured VZ falls between 7.79 V and 8.61 V at 150 mA test current and 25 °C lead temperature. The tolerance is guaranteed per JEDEC specification and verified during 100% production testing.
Can the 1N5344/TR8 be used in surface-mount designs?
No - the 1N5344/TR8 is an axial-leaded T-18 package device intended for through-hole mounting. For surface-mount equivalents, Microsemi offers the SMBJ5344B (DO-214AA) and SMBG5344B (DO-214AB), which share identical electrical specs but require different PCB layout and reflow profiles.
What is the maximum steady-state power dissipation of the 1N5344/TR8 on a standard FR4 board?
When mounted on a standard FR4 PCB (1 oz copper, 4 mm² pads, 1 mm track width, 25 mm length), the 1N5344/TR8 delivers 1.47 W steady-state power at 25 °C ambient. This derates linearly above 25 °C per the 85 °C/W junction-to-ambient thermal resistance shown in Figure 1 of the datasheet.
Does the 1N5344/TR8 meet RoHS requirements?
Yes - the "e3" suffix in the full part marking (as documented in Microsemi's REV D datasheet) confirms RoHS compliance. The device uses annealed matte-tin plating on leads and halogen-free UL94V-0 epoxy encapsulation, satisfying EU Directive 2011/65/EU and related exemptions.
How is polarity identified on the 1N5344/TR8?
The cathode of the 1N5344/TR8 is marked by a distinct color band on the body - the banded end must be held at a more positive potential than the anode to achieve Zener breakdown. Reverse connection (band to ground) results in forward conduction (~1.2 V drop), not regulation.
1N5344/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):
- 8.2 V
- Tolerance:
- ±20%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 1.5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 5.9 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
1N5344/TR8 FAQ
1.How can I place an order for 1N5344/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5344/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 1N5344/TR8 reliable?
The price and inventory of 1N5344/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5344/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5344/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5344/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5344/TR8?
1N5344/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5344/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 1N5344/TR8?
For technical support, including 1N5344/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5344/TR8 requirements.
6.How does Aetrix verify that 1N5344/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5344/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 1N5344/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5344/TR8?
All 1N5344/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5344/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 1N5344/TR8 part is unused and in its original packaging.
Return procedure for 1N5344/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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