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Microchip Technology 1N5343A/TR12
- Part No.:
- 1N5343A/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5343A/TR12.pdf
- Description:
- DIODE ZENER 7.5V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:2,802
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Product details
Overview
1N5343A/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal zener voltage of 7.5 V, ±10% tolerance (A suffix), 175 mA test current (IZT), 1.5 Ω maximum dynamic impedance (ZZ), and 630 mA maximum zener current (IZM). It regulates voltage in power supply feedback loops, overvoltage protection circuits, and reference voltage generation where stable 7.5 V clamping is required under varying load and temperature.
For engineers reviewing the 1N5343A/TR12 datasheet, 1N5343A/TR12 pinout, 1N5343A/TR12 application, or 1N5343A/TR12 equivalent, key selection criteria include its 7.5 V regulation point, ±10% tolerance, 5 W steady-state power rating at TL < 25°C, 25 °C/W junction-to-lead thermal resistance, 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 when reverse-biased above VZ. Its low dynamic impedance (1.5 Ω) ensures minimal voltage variation over operating current range (10–50% of IZM), and its 25 °C/W thermal resistance enables reliable 5 W dissipation with 3/8″ lead length heat sinking.
The device features a void-free thermosetting epoxy T-18 package rated for -65°C to +150°C operation, cathode band polarity marking, and compliance with IPC/JEDEC J-STD-020B Level 1 moisture sensitivity-no dry pack required. It withstands 10 A non-recurrent 8.3 ms surge current and exhibits ≤0.15 V voltage regulation (ΔVZ) between 10% and 50% of IZM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±10% - precise clamping threshold for 7.5 V reference or protection circuits |
| Test Current (IZT) | 175 mA - defined operating point for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 1.5 Ω max - low AC resistance ensures stable regulation under dynamic load changes |
| Max Zener Current (IZM) | 630 mA - maximum continuous DC current at TL < 25°C with adequate heatsinking |
| Power Dissipation | 5.0 W at TL < 25°C - usable full power only with proper lead-length thermal path |
| Voltage Regulation (ΔVZ) | 0.15 V max - difference between VZ measured at 10% and 50% of IZM, indicating tight regulation linearity |
| Surge Current (IZSM) | 10 A peak (8.3 ms half-sine) - transient overvoltage handling capability without failure |
Pinout & Package
Package: Axial-leaded T-18 plastic encapsulated case with void-free thermosetting epoxy body (UL94V-0), tin-lead or RoHS-compliant matte-tin plated leads, cathode indicated by color band. Weight: 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse bias reference node | Connected to lower-potential side in Zener regulation; defines forward voltage drop (≤1.2 V @ 1.0 A) |
| Cathode (banded end) | Zener breakdown terminal / Voltage reference output | Connected to higher-potential side; maintains 7.5 V relative to anode when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with industry-standard 1N53xx mechanical and electrical definitions for interchangeability |
| ±10% voltage tolerance (A suffix) | Cost-optimized tolerance grade suitable for non-critical regulation and clamping applications |
| Level 1 moisture sensitivity | No dry pack or baking required before PCB assembly-reduces manufacturing overhead |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020-robust handling in standard assembly environments |
| Tape-and-reel packaging (TR12) | Standard EIA-296 compliant reel format for automated SMT placement compatibility |
Applications
| Switching Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in flyback or buck converter feedback loop using optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Zener reference element providing stable 7.5 V threshold to set output regulation point. Use Value: Enables accurate ±5% output voltage control despite input line and load variations due to low ΔVZ (0.15 V) and stable VZ over temperature. |
Use Scenario: Placed across DC bus or IC supply rail to clamp transients exceeding safe operating voltage. IC Role / Device Role / Timing Role: Passive voltage clamp absorbing energy during surge events up to 10 A (8.3 ms). Use Value: Prevents damage to downstream logic or power devices by limiting voltage to ≤7.5 V + ΔVZ under fault conditions. |
| Fixed Reference Voltage Generator | Industrial Sensor Excitation |
Use Scenario: Provides stable excitation voltage for precision resistive sensors (e.g., RTDs, strain gauges) in analog front-ends. IC Role / Device Role / Timing Role: Low-noise, low-drift DC reference source replacing more complex IC references where cost and simplicity are prioritized. Use Value: Delivers 7.5 V reference with ≤0.15 V regulation error across 17.5–315 mA operating range-sufficient for 12-bit ADC systems. |
Use Scenario: Supplies constant voltage to bridge-based pressure or flow sensors in harsh industrial environments. IC Role / Device Role / Timing Role: Robust, high-surge-capable voltage limiter ensuring sensor excitation stays within specified range despite EMI or switching noise. Use Value: Maintains sensor accuracy by holding excitation at 7.5 V ±0.15 V while surviving repeated 10 A surges per MIL-STD-750. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5343B/TR12 | ±5% tolerance (B suffix) vs. ±10% (A); identical VZ, IZT, ZZ, IZM, and package | Higher precision required in closed-loop feedback or metrology-grade references | Select 1N5343B/TR12 when tighter regulation stability justifies premium tolerance cost |
| MMBZ5234BS-7-F | Surface-mount SOD-123 package; 7.5 V ±5%; 200 mW power rating; 100 mA IZM | Space-constrained PCBs where axial leads are impractical; low-power biasing only | Choose MMBZ5234BS-7-F only for low-current (<100 mA), space-limited designs-cannot replace 1N5343A/TR12 in 5 W applications |
Compared with 1N5343B/TR12, the 1N5343A/TR12 trades voltage precision for cost efficiency in non-critical clamping; versus MMBZ5234BS-7-F, it delivers 31.5× higher power handling but requires axial mounting and larger board area.
Availability
1N5343A/TR12 is available at Aetrix Electronics and suitable for switching power supplies, overvoltage protection circuits, and fixed reference voltage generators requiring stable component supply across industrial, telecom, and embedded control programs.
Supply support for 1N5343A/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, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N53xx series was designed as a JEDEC-standardized, high-power axial Zener family delivering robust voltage regulation from 3.3 V to 200 V with scalable screening and RoHS compliance for mission-critical power and protection functions.
FAQ
What is the zener voltage tolerance of the 1N5343A/TR12?
The 1N5343A/TR12 has a nominal zener voltage of 7.5 V with ±10% tolerance, as indicated by the "A" suffix per Microsemi's documentation. This means the actual VZ falls between 6.75 V and 8.25 V at 175 mA test current and 25°C lead temperature. The tolerance is confirmed in the Electrical Characteristics table on page 1 of the official datasheet.
Can the 1N5343A/TR12 be used in surface-mount designs?
No-the 1N5343A/TR12 is an axial-leaded T-18 package device intended for through-hole mounting. For surface-mount equivalents, Microsemi offers the SMBJ5343A series in DO-214AA (SMB) package. The 1N5343A/TR12 itself requires hole drilling and wave or hand soldering; its 0.7 g weight and lead geometry are incompatible with pick-and-place SMT processes.
What is the maximum continuous power dissipation for the 1N5343A/TR12?
The 1N5343A/TR12 is rated for 5.0 W steady-state power dissipation when lead temperature (TL) is maintained below 25°C, typically achieved with ≥3/8″ (10 mm) lead length acting as a thermal path. On FR4 PCB with 1 oz copper, its derated power drops to 1.47 W at 25°C ambient-this thermal limit must be respected to avoid junction overheating and parametric shift.
Does the 1N5343A/TR12 require dry packing before reflow?
No. The 1N5343A/TR12 has IPC/JEDEC J-STD-020B moisture sensitivity level 1, meaning it may be stored indefinitely at ≤30°C/60% RH without dry pack or baking. This eliminates pre-reflow baking steps and reduces handling risk-confirmed in the Features section of the Microsemi datasheet.
How does the voltage regulation (ΔVZ) specification impact circuit performance?
The 1N5343A/TR12 specifies ΔVZ ≤ 0.15 V-the difference between VZ measured at 10% and 50% of IZM (63 mA and 315 mA). This low value indicates excellent line regulation, meaning output voltage remains stable across wide current swings, critical for feedback loops and reference circuits where load-dependent drift must be minimized.
1N5343A/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):
- 7.5 V
- Tolerance:
- ±10%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 1.5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 5.4 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
1N5343A/TR12 FAQ
1.How can I place an order for 1N5343A/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5343A/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 1N5343A/TR12 reliable?
The price and inventory of 1N5343A/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5343A/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5343A/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5343A/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5343A/TR12?
1N5343A/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5343A/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 1N5343A/TR12?
For technical support, including 1N5343A/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5343A/TR12 requirements.
6.How does Aetrix verify that 1N5343A/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5343A/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 1N5343A/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5343A/TR12?
All 1N5343A/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5343A/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 1N5343A/TR12 part is unused and in its original packaging.
Return procedure for 1N5343A/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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