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Microchip Technology 1N5344A/TR8
- Part No.:
- 1N5344A/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5344A/TR8.pdf
- Description:
- DIODE ZENER 8.2V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:2,958
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Product details
Overview
1N5344A/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 14 V, ±10% tolerance (A suffix), 75 mA maximum Zener current (IZM), 2.5 Ω maximum dynamic impedance (ZZ), and 5.0 μA reverse leakage at 11.2 V. It delivers stable voltage reference in power supply feedback loops, overvoltage clamping circuits, and precision biasing networks.
For engineers reviewing the 1N5344A/TR8 datasheet, 1N5344A/TR8 pinout, 1N5344A/TR8 application, or 1N5344A/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (6.3 A), steady-state power derating profile, and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain a stable voltage across its terminals under varying load and temperature conditions. Its 25 °C/W junction-to-lead thermal resistance enables reliable 5 W dissipation with 3/8″ lead length heat sinking, while the 85 °C/W junction-to-ambient rating applies to FR4 PCB mounting with defined copper pad geometry.
The device exhibits 2.5 Ω dynamic impedance at 100 mA test current and 0.25 V voltage regulation (ΔVZ) between 10% and 50% of IZM - confirming tight regulation performance within its ±10% VZ tolerance band. Reverse leakage remains ≤5.0 μA at VR = 11.2 V, supporting low-power standby operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14 V nominal, ±10% tolerance - defines regulated output voltage range (12.6–15.4 V) for feedback or clamp applications |
| Power Dissipation (Pd) | 5.0 W at TL = 25 °C - requires minimum 3/8″ lead length heat sinking for full-rated operation |
| Max Zener Current (IZM) | 75 mA - maximum continuous DC current before thermal runaway under specified mounting conditions |
| Dynamic Impedance (ZZ) | 2.5 Ω max at IZT = 100 mA - low AC impedance ensures minimal voltage variation under dynamic load changes |
| Reverse Leakage (IR) | 5.0 μA max at VR = 11.2 V - enables low-quiescent-current designs in battery-backed or standby circuits |
| Surge Current (IZSM) | 6.3 A peak (8.3 ms half-sine) - withstands transient overvoltage events without degradation |
| Thermal Resistance | 25 °C/W junction-to-lead - supports thermal design with discrete heatsinking via leads |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC DO-204AL; void-free UL94V-0 epoxy body; cathode indicated by band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026; weight 0.7 g.
| 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; connected to regulated voltage node or error amplifier input; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures standardized mechanical dimensions, marking, and reliability testing across global supply chain |
| Moisture sensitivity Level 1 | No dry pack required - simplifies handling, storage, and assembly logistics |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD controls during board assembly |
| High surge current capability | 6.3 A non-recurrent half-sine (8.3 ms) - protects downstream circuitry from line transients without external TVS |
| Stable voltage regulation over temperature | Operating range −65 °C to +150 °C with ΔVZ ≤ 0.25 V - maintains accuracy in automotive and industrial environments |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback loop using optocoupler-coupled error signal. IC Role / Device Role / Timing Role: Precision voltage reference for TL431-like comparator function; sets upper bound of output regulation window. Use Value: Maintains ±1% output stability over line/load/temperature with 14 V ±10% tolerance and 2.5 Ω dynamic impedance. |
Use Scenario: Clamps transient voltage spikes on 12 V rail caused by inductive switching or ESD events. IC Role / Device Role / Timing Role: Shunt protection element that conducts above 14 V threshold to limit rail excursion. Use Value: Absorbs 6.3 A surge (8.3 ms) without failure, preventing damage to downstream 12 V logic or sensors. |
| Programmable Voltage Reference | DC Bias Generator |
Use Scenario: Provides stable reference for analog-to-digital converter (ADC) input scaling or sensor excitation circuit. IC Role / Device Role / Timing Role: Low-drift, low-noise DC reference source replacing more expensive IC references where ±10% accuracy suffices. Use Value: Delivers 14 V reference with ≤5 μA leakage at 11.2 V, minimizing loading on high-impedance bias networks. |
Use Scenario: Sets gate bias point for linear-mode MOSFETs in constant-current LED drivers or analog amplifiers. IC Role / Device Role / Timing Role: Fixed-voltage bias node ensuring predictable transistor operating point across temperature. Use Value: Stable 14 V regulation with 0.25 V ΔVZ ensures consistent bias current despite supply ripple or thermal drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5344B/TR8 | ±5% VZ tolerance (13.3–14.7 V) vs. ±10% (12.6–15.4 V); identical package, power, and thermal specs | Narrower regulation window suits tighter feedback loops; higher cost due to tighter binning | Select when system-level voltage accuracy requirements exceed ±10% and budget allows premium tolerance grade |
| MMBZ5242BS-7-F | Surface-mount SOD-123 package; 14 V ±5%; 225 mW power rating; 100 Ω dynamic impedance | Not suitable for 5 W dissipation; intended for low-power signal-level clamping or biasing only | Choose only for space-constrained PCBs where thermal load is <250 mW; not a functional replacement for 1N5344A/TR8's power capability |
Compared with 1N5344B/TR8 and MMBZ5242BS-7-F, the 1N5344A/TR8 provides optimal balance of cost, axial-lead serviceability, and 5 W power handling - making it preferred for industrial power supplies and ruggedized clamping where ±10% regulation tolerance is acceptable.
Availability
1N5344A/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, programmable voltage references, and DC bias generators requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N5344A/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 1N53xx series was engineered for robust voltage regulation in harsh-environment power systems, emphasizing thermal resilience, surge survivability, and JEDEC-standardized manufacturability across military and commercial grades.
FAQ
What is the Zener voltage tolerance of the 1N5344A/TR8?
The 1N5344A/TR8 has a nominal Zener voltage of 14 V with ±10% tolerance, meaning its actual regulation voltage falls between 12.6 V and 15.4 V at 25 °C. This tolerance is designated by the "A" suffix per Microsemi documentation and applies across the full operating temperature range of −65 °C to +150 °C.
Can the 1N5344A/TR8 be used in surface-mount designs?
No - the 1N5344A/TR8 uses a T-18 axial-leaded package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5344B series in DO-214AA (SMB) package, which shares the same electrical characteristics but requires reflow-compatible layout and thermal management.
What is the maximum surge current rating for the 1N5344A/TR8?
The 1N5344A/TR8 is rated for a non-recurrent peak surge current (IZSM) of 6.3 A, defined as the maximum amplitude of an 8.3 ms half-sine waveform. This rating assumes proper lead heat sinking and is validated per Microsemi test methodology, enabling use in transient suppression without additional TVS devices.
How does the thermal resistance of the 1N5344A/TR8 affect PCB layout?
The 1N5344A/TR8 has 25 °C/W junction-to-lead thermal resistance when mounted with 3/8″ (10 mm) lead length from the body - so PCB layout must provide adequate copper pour or heatsink attachment to the leads. On FR4 with standard pads, its junction-to-ambient resistance rises to 85 °C/W, limiting usable power to ~1.47 W unless enhanced cooling is implemented.
Is the 1N5344A/TR8 RoHS compliant?
Yes - the 1N5344A/TR8 is RoHS compliant, as confirmed by the "e3" suffix in Microsemi's official documentation. Its leads feature annealed matte-tin plating per MIL-STD-750 Method 2026, and the void-free epoxy body meets UL94V-0 flammability standards, satisfying EU Directive 2011/65/EU requirements.
1N5344A/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:
- ±10%
- 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
1N5344A/TR8 FAQ
1.How can I place an order for 1N5344A/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5344A/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 1N5344A/TR8 reliable?
The price and inventory of 1N5344A/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5344A/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5344A/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5344A/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5344A/TR8?
1N5344A/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5344A/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 1N5344A/TR8?
For technical support, including 1N5344A/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5344A/TR8 requirements.
6.How does Aetrix verify that 1N5344A/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5344A/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 1N5344A/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5344A/TR8?
All 1N5344A/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5344A/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 1N5344A/TR8 part is unused and in its original packaging.
Return procedure for 1N5344A/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5344A/TR8 Tags
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