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Microchip Technology 1N5344B/TR8
- Part No.:
- 1N5344B/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5344B/TR8.pdf
- Description:
- DIODE ZENER 8.2V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:7,945
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Product details
Overview
1N5344B/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 8.2 V ±5%, 150 mA test current (IZT), 1.5 Ω dynamic impedance (ZZ), 10 μA reverse leakage at 5.9 V, and maximum surge current of 10 A (8.3 ms half-sine). 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 1N5344B/TR8 datasheet, 1N5344B/TR8 pinout, 1N5344B/TR8 application, or 1N5344B/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), steady-state power rating (5 W at TL < 25°C), reverse leakage at VR = 5.9 V, and surge current capability under transient conditions.
Technical Context
This Zener diode functions as a two-terminal voltage regulator in reverse-biased mode, maintaining stable output voltage across wide operating current ranges (10 mA to 150 mA) and temperature extremes (–65°C to +150°C). Its low dynamic impedance (1.5 Ω) ensures minimal voltage variation under load changes.
The device uses void-free thermosetting epoxy encapsulation (UL94V-0), tin-lead or RoHS-compliant matte-tin plating, and features cathode band polarity marking. Thermal performance is specified for 3/8″ (10 mm) lead length from body (25 °C/W) and FR4 PCB mounting (85 °C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2 V ±5% - precise regulation point for feedback networks requiring tight voltage stability |
| Test Current (IZT) | 150 mA - standardized bias point where VZ and ZZ are measured; defines typical operating current |
| Dynamic Impedance (ZZ) | 1.5 Ω - low AC resistance ensures minimal ΔVZ under varying load currents |
| Reverse Leakage (IR) | 10 μA @ 5.9 V - low off-state current preserves efficiency in high-impedance bias circuits |
| Max Surge Current (IZSM) | 10 A (8.3 ms half-sine) - withstands short-duration transients without degradation |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables 5 W dissipation with modest heatsinking at lead termination |
| Operating Temperature | –65°C to +150°C - supports industrial, automotive, and aerospace environments |
Pinout & Package
Package: Axial-leaded T-18 plastic case (JEDEC DO-204AL), void-free UL94V-0 epoxy body, cathode indicated by color band. Leads are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower potential node; reverse bias applied between cathode and anode for regulation |
| Cathode | Zener regulation terminal | Banded end; connected to higher potential node; voltage referenced to anode during reverse operation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures industry-standard mechanical and electrical interchangeability across manufacturers |
| ±5% voltage tolerance (B suffix) | Reduces calibration overhead in mid-precision voltage references and clamping circuits |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints for SMT assembly prep |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables handling without special ESD controls in production and field repair |
| RoHS compliant (e3 suffix) | Meets global environmental compliance requirements without derating or performance trade-offs |
Applications
| Switching Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback paths using optocoupler-coupled error amplifiers. IC Role / Device Role / Timing Role: Precision voltage reference establishing stable setpoint for error amplifier comparison. Use Value: 8.2 V ±5% regulation with 1.5 Ω dynamic impedance maintains ±0.5% output accuracy across line/load/temperature variations. |
Use Scenario: Clamps transient overvoltage on DC bus lines (e.g., 12 V rail) during load dump or inductive switching events. IC Role / Device Role / Timing Role: Two-terminal shunt protector diverting excess energy to ground when voltage exceeds 8.2 V threshold. Use Value: 10 A surge rating (8.3 ms) absorbs IEC 61000-4-5 Level 3 surges without failure; low ZZ minimizes clamping overshoot. |
| Industrial Sensor Excitation | Reference Voltage for ADC Bias |
Use Scenario: Provides stable excitation voltage for resistive bridge sensors (e.g., strain gauges, RTDs) in harsh factory environments. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage source replacing more complex IC references where cost and reliability are critical. Use Value: –65°C to +150°C operating range and 10 μA IR at 5.9 V ensure stable bias under thermal cycling and high-impedance loading. |
Use Scenario: Supplies reference voltage to 12-bit SAR ADCs in programmable logic controllers and data acquisition modules. IC Role / Device Role / Timing Role: Passive voltage reference with predictable temperature coefficient and low dynamic impedance. Use Value: 150 mA IZT and 1.5 Ω ZZ support clean, low-noise reference generation even with moderate ADC input capacitance and switching currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5344B (bulk) | Identical electrical specs; differs only in packaging (bulk vs. tape-and-reel TR8) | No functional difference; TR8 enables automated pick-and-place; bulk suits manual prototyping or low-volume hand-solder | Select 1N5344B/TR8 for SMT production; choose bulk for evaluation or repair spares |
| MMBZ5231B (SOT-23) | Surface-mount package; same 8.2 V ±5%, but lower 0.5 W rating and 100 mA IZT | Not suitable for 5 W continuous dissipation; limited to low-power bias/reference roles | Use MMBZ5231B only where board space is constrained and power < 0.5 W; retain 1N5344B/TR8 for full 5 W capability |
Compared with 1N5344B/TR8, the bulk version offers identical performance with different logistics handling, while MMBZ5231B trades power capability for miniaturization-making 1N5344B/TR8 the sole choice for robust 5 W axial Zener regulation in industrial power systems.
Availability
1N5344B/TR8 is available at Aetrix Electronics and suitable for switching power supplies, overvoltage protection circuits, industrial sensor excitation, and precision reference voltage generation requiring stable component supply across extended temperature ranges and high-reliability manufacturing.
Supply support for 1N5344B/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 as a ruggedized, JEDEC-standard 5 W Zener platform for mission-critical voltage regulation where thermal stability, surge resilience, and long-term parametric consistency are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N5344B/TR8?
The 1N5344B/TR8 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix in its part number. This means its nominal 8.2 V regulation voltage falls within 7.79 V to 8.61 V at 25°C with 150 mA test current. The tolerance remains valid across the full operating temperature range (–65°C to +150°C), supporting designs requiring predictable voltage limits without active trimming.
Can the 1N5344B/TR8 be used in surface-mount designs?
No-the 1N5344B/TR8 is an axial-leaded T-18 package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5344B (DO-214AA) and SMBG5344B (DO-214AB), which share identical electrical specifications but require different footprint and reflow profiles. The TR8 tape-and-reel format supports automated axial insertion, not SMT placement.
What is the maximum continuous power dissipation for the 1N5344B/TR8?
The 1N5344B/TR8 is rated for 5.0 W continuous power dissipation at a lead temperature (TL) of 25°C with 3/8″ (10 mm) lead length from the body. Derating is required above 25°C-approximately 40 mW/°C reduction beyond that point. On FR4 PCB with 1 oz copper, steady-state power drops to 1.47 W at 25°C ambient due to higher thermal resistance (85 °C/W junction-to-ambient).
How does the 1N5344B/TR8 handle transient overvoltage events?
The 1N5344B/TR8 supports a maximum non-recurrent surge current (IZSM) of 10 A for an 8.3 ms half-sine waveform, per JEDEC standard. This allows it to absorb common power-line transients (e.g., IEC 61000-4-5 Level 3) without parametric shift or failure. Its low dynamic impedance (1.5 Ω) also minimizes clamping voltage overshoot during fast-rising events.
Is the 1N5344B/TR8 RoHS compliant?
Yes-the "e3" designation in the full part number (1N5344B/TR8 e3) confirms RoHS compliance per EU Directive 2011/65/EU. The device uses RoHS-compliant matte-tin plating on leads and halogen-free epoxy encapsulation meeting UL94V-0. No exemptions are applied; all six restricted substances are below threshold limits.
1N5344B/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:
- ±5%
- 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
1N5344B/TR8 FAQ
1.How can I place an order for 1N5344B/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5344B/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 1N5344B/TR8 reliable?
The price and inventory of 1N5344B/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5344B/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5344B/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5344B/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5344B/TR8?
1N5344B/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5344B/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 1N5344B/TR8?
For technical support, including 1N5344B/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5344B/TR8 requirements.
6.How does Aetrix verify that 1N5344B/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5344B/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 1N5344B/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5344B/TR8?
All 1N5344B/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5344B/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 1N5344B/TR8 part is unused and in its original packaging.
Return procedure for 1N5344B/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5344B/TR8 Tags
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