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Microchip Technology 1N5343C/TR8
- Part No.:
- 1N5343C/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5343C/TR8.pdf
- Description:
- DIODE ZENER 7.5V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:3,474
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Product details
Overview
1N5343C/TR8 from Microsemi is a silicon 5 W axial-leaded Zener diode with nominal regulation voltage of 7.5 V, ±2% tolerance (C suffix), 175 mA test current (IZT), 1.5 Ω maximum dynamic impedance (ZZ), and 630 mA maximum Zener current (IZM) at 25 °C lead temperature. 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 1N5343C/TR8 datasheet, 1N5343C/TR8 pinout, 1N5343C/TR8 application, or 1N5343C/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (10.7 A), reverse leakage performance (10 µA @ 5.4 V), and RoHS-compliant e3 marking compatibility.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown mode. Its Zener voltage is specified at 7.5 V ±2% under 175 mA DC test current, with low dynamic impedance (≤1.5 Ω) ensuring stable regulation across load variations. The 25 °C/W thermal resistance enables reliable 5 W dissipation when leads are held at ≤25 °C (3/8″ from body).
It features a void-free thermosetting epoxy T-18 package with cathode band polarity marking, tin-lead or RoHS-compliant matte-tin plating, and moisture sensitivity level 1 (no dry pack required). Surge capability is defined per non-recurring 8.3 ms half-sine waveform (IZSM = 10.7 A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±2% - precise reference point for feedback networks requiring tight regulation stability. |
| Test Current (IZT) | 175 mA - operating point where VZ and ZZ are guaranteed; defines minimum bias for stable regulation. |
| Dynamic Impedance (ZZ) | 1.5 Ω max - low AC resistance ensures minimal output voltage variation under changing load current. |
| Max Zener Current (IZM) | 630 mA - maximum continuous DC current at TL = 25 °C; sets upper limit for safe power dissipation (5 W). |
| Reverse Leakage (IR) | 10 µA max @ 5.4 V - low off-state conduction preserves efficiency in standby or high-impedance sensing paths. |
| Surge Current (IZSM) | 10.7 A - peak non-repetitive current handling for transient overvoltage suppression (8.3 ms half-sine). |
| Thermal Resistance | 25 °C/W junction-to-lead - enables full 5 W rating with simple lead heatsinking; 85 °C/W junction-to-ambient on FR4. |
Pinout & Package
Package: Axial-leaded T-18 plastic case (JEDEC DO-204AL), void-free UL94V-0 epoxy body, 0.7 g weight, cathode indicated by colored band. Leads are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; reverse-biased operation requires cathode at higher potential. |
| Cathode | Regulated output node | Banded end; supplies stable 7.5 V reference when reverse-biased above breakdown threshold. |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables tighter feedback loop accuracy than ±5% (B) or ±10% (A) variants without trimming. |
| Low dynamic impedance (≤1.5 Ω) | Minimizes output voltage deviation under dynamic load steps in regulated power supply outputs. |
| High surge current rating (10.7 A) | Provides robust transient clamping for input-stage overvoltage protection without external TVS. |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints-ready for standard SMT/reflow or hand-solder processes. |
| e3 RoHS-compliant marking | Confirms lead-free plating and halogen-free packaging compliant with EU RoHS Directive 2011/65/EU. |
Applications
| Switching Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback path via optocoupler. IC Role / Device Role / Timing Role: Precision voltage reference establishing error amplifier setpoint. Use Value: ±2% tolerance ensures output stays within ±3% regulation window across line/load/temperature. |
Use Scenario: Provides stable excitation voltage for resistive bridge sensors (e.g., strain gauges, RTDs) in PLC analog input modules. IC Role / Device Role / Timing Role: Low-drift DC reference source for ratiometric measurement circuits. Use Value: 1.5 Ω dynamic impedance minimizes reference error induced by sensor current draw variations. |
| Overvoltage Clamp Circuit | Programmable Threshold Detector |
Use Scenario: Clamps transient spikes on 12 V rail in automotive body control module power inputs. IC Role / Device Role / Timing Role: Shunt protector diverting surge energy to ground during load dump events. Use Value: 10.7 A surge rating handles 8.3 ms transients per ISO 7637-2 without degradation. |
Use Scenario: Sets trip point for comparator-based undervoltage lockout (UVLO) in battery-powered IoT node power management. IC Role / Device Role / Timing Role: Stable threshold reference enabling repeatable activation at 7.5 V ±0.15 V. Use Value: Tight 2% tolerance eliminates need for external calibration; supports single-supply comparator operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5343B/TR8 | Same 7.5 V nominal VZ but ±5% tolerance (B suffix); otherwise identical electrical specs and package. | Acceptable where ±5% regulation window suffices (e.g., non-critical biasing), reducing cost vs. C-grade. | Select 1N5343B/TR8 for cost-sensitive designs where tighter tolerance is not required for functional safety or metrology. |
| MMSZ5235B-TP | Surface-mount SOD-123 package; same 7.5 V ±5%; lower IZM (200 mA); higher ZZ (7 Ω); RoHS only. | Used in space-constrained PCBs where axial leads are impractical; unsuitable for 5 W continuous dissipation. | Choose MMSZ5235B-TP only for low-power (<1 W), high-density layouts; not a thermal or surge-capability replacement for 1N5343C/TR8. |
Compared with 1N5343B/TR8 and MMSZ5235B-TP, the 1N5343C/TR8 delivers superior voltage accuracy and thermal robustness for 5 W-class regulation, making it optimal for industrial power supplies and ruggedized sensor interfaces where long-term stability and surge resilience are critical.
Availability
1N5343C/TR8 is available at Aetrix Electronics and suitable for switching power supply feedback, industrial sensor reference, and overvoltage clamp circuits requiring stable component supply, extended temperature operation (–65 °C to +150 °C), and RoHS compliance.
Supply support for 1N5343C/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 1N53xx series was designed for precision voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge immunity, and long-term parametric stability under extended temperature cycling.
FAQ
What is the Zener voltage tolerance of the 1N5343C/TR8?
The 1N5343C/TR8 has a Zener voltage tolerance of ±2%, as indicated by the "C" suffix per Microsemi's documentation. This means its measured VZ at 175 mA test current falls between 7.35 V and 7.65 V at 25 °C lead temperature. This tighter tolerance supports applications demanding higher reference accuracy than the ±5% 1N5343B/TR8 variant.
Can the 1N5343C/TR8 be used in surface-mount designs?
No - the 1N5343C/TR8 uses an axial-leaded T-18 (DO-204AL) package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5343B series in SMB package, or consider MMSZ5235B-TP in SOD-123 - though these differ in power rating, surge capability, and tolerance. The 1N5343C/TR8 requires through-hole mounting with adequate lead heatsinking.
What is the maximum power dissipation of the 1N5343C/TR8 at ambient temperature?
The 1N5343C/TR8 dissipates up to 5.0 W only when lead temperature (TL) is maintained at ≤25 °C (measured 3/8″ from body). On a standard FR4 PCB (1 oz Cu, 4 mm² pads), its steady-state power drops to 1.47 W at 25 °C ambient due to higher junction-to-ambient thermal resistance (85 °C/W). Derating curves in the datasheet must be applied for elevated ambient conditions.
Does the 1N5343C/TR8 meet RoHS requirements?
Yes - the "e3" suffix in the full part number (1N5343C/TR8 e3) confirms RoHS compliance per EU Directive 2011/65/EU. This includes lead-free matte-tin plating on leads and halogen-free epoxy encapsulation. The device is moisture sensitivity Level 1 and requires no dry-packaging or floor-life controls prior to soldering.
How does the 1N5343C/TR8 compare to the 1N4733A in terms of regulation performance?
The 1N5343C/TR8 offers tighter tolerance (±2% vs. ±5%), lower dynamic impedance (1.5 Ω vs. ~6 Ω), higher surge current (10.7 A vs. ~3.5 A), and higher power rating (5 W vs. 1 W) than the 1N4733A. While both regulate at ~7.5 V, the 1N5343C/TR8 is engineered for industrial-grade reliability, thermal stability, and transient resilience - not a drop-in replacement due to package and thermal design differences.
1N5343C/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):
- 7.5 V
- Tolerance:
- ±2%
- 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
1N5343C/TR8 FAQ
1.How can I place an order for 1N5343C/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5343C/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 1N5343C/TR8 reliable?
The price and inventory of 1N5343C/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5343C/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5343C/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5343C/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5343C/TR8?
1N5343C/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5343C/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 1N5343C/TR8?
For technical support, including 1N5343C/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5343C/TR8 requirements.
6.How does Aetrix verify that 1N5343C/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5343C/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 1N5343C/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5343C/TR8?
All 1N5343C/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5343C/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 1N5343C/TR8 part is unused and in its original packaging.
Return procedure for 1N5343C/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5343C/TR8 Tags
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