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Microchip Technology 1N5343CE3/TR12
- Part No.:
- 1N5343CE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5343CE3/TR12.pdf
- Description:
- DIODE ZENER 7.5V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:8,953
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Product details
Overview
1N5343CE3/TR12 from Microsemi is a 5 W, 7.5 V ±2% tolerance axial-leaded silicon Zener diode designed for precision voltage regulation in power supply reference and overvoltage protection circuits. It delivers stable regulation at 175 mA test current, with 1.5 Ω dynamic impedance, 630 mA maximum Zener current (IZM), and operates across –65°C to +150°C.
For engineers reviewing the 1N5343CE3/TR12 datasheet, 1N5343CE3/TR12 pinout, 1N5343CE3/TR12 application, or 1N5343CE3/TR12 equivalent, key selection criteria include tight ±2% voltage tolerance (C suffix), RoHS-compliant matte-tin plating (e3), tape-and-reel packaging (TR12), and thermal resistance of 25 °C/W junction-to-lead at 10 mm lead length.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 7.5 V measured at 175 mA (IZT) and 25 °C. Its low dynamic impedance (1.5 Ω) ensures minimal voltage variation under load changes, while its 630 mA IZM supports robust regulation in high-current reference paths when adequately heat-sunk.
The device uses a void-free thermosetting epoxy T-18 package with cathode band polarity marking, rated for 5 W steady-state dissipation at TL < 25 °C (3/8″ lead length), and exhibits 0.15 V voltage regulation (ΔVZ) between 10% and 50% of IZM - confirming high stability across operating current range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±2% - precise reference voltage for feedback loops and clamp thresholds |
| Test Current (IZT) | 175 mA - defined operating point for VZ specification and impedance measurement |
| Dynamic Impedance (ZZ) | 1.5 Ω - low AC resistance ensures minimal output voltage drift with current transients |
| Max Zener Current (IZM) | 630 mA - maximum continuous DC current before thermal runaway under proper heatsinking |
| Power Dissipation | 5.0 W at TL < 25 °C - requires 10 mm lead length from body for full rating; derates linearly above 25 °C |
| Thermal Resistance | 25 °C/W junction-to-lead - enables predictable temperature rise in lead-mounted designs |
| Reverse Leakage (IR) | 10 µA max at 5.4 V - ensures low standby power loss in high-impedance bias networks |
Pinout & Package
Package: Axial-leaded T-18 plastic case (JEDEC DO-201AD), void-free UL94V-0 epoxy body, cathode indicated by colored band. Leads are annealed matte-tin plated per MIL-STD-750 Method 2026 for RoHS compliance (e3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; reverse-biased operation requires cathode at higher potential |
| Cathode | Zener voltage output node | Banded end; supplies regulated 7.5 V when reverse-biased and current ≥ IZT |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables accurate voltage references without post-calibration in industrial power supplies |
| RoHS-compliant matte-tin plating (e3) | Supports lead-free reflow soldering up to 260 °C for 10 s without degradation |
| Tape-and-reel packaging (TR12) | Facilitates automated SMT placement despite axial form factor via carrier tape handling |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints for assembly logistics |
| 25 °C/W junction-to-lead thermal resistance | Allows direct lead-mounting on chassis or heatsink without PCB copper pour for thermal management |
Applications
| Industrial Power Supply Reference | Overvoltage Clamp in DC-DC Converters |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback converters with optocoupler-based regulation. IC Role / Device Role / Timing Role: Zener diode provides precise 7.5 V reference to TL431 shunt regulator input or directly biases optocoupler LED. Use Value: ±2% tolerance ensures output voltage accuracy within ±1.5% over line/load/temperature, reducing need for trim pots. |
Use Scenario: Protecting MOSFET gate drivers from transient overvoltage during switching transitions. IC Role / Device Role / Timing Role: Clamps gate-source voltage to 7.5 V during dv/dt-induced coupling or shoot-through events. Use Value: 630 mA IZM and 5 W rating absorb repetitive 100 ns–1 µs surges without degradation, extending driver lifetime. |
| Programmable Voltage Monitor Threshold | Low-Cost Analog Sensor Biasing |
Use Scenario: Setting trip point for comparator-based brown-out detection in microcontroller power domains. IC Role / Device Role / Timing Role: Supplies stable 7.5 V reference to comparator non-inverting input; system resets when supply drops below threshold. Use Value: Low ΔVZ (0.15 V) ensures consistent trip point across operating current range, minimizing false triggers. |
Use Scenario: Providing excitation voltage for resistive temperature detectors (RTDs) or strain gauges in data acquisition front-ends. IC Role / Device Role / Timing Role: Acts as low-noise, low-drift voltage source for Wheatstone bridge excitation. Use Value: 1.5 Ω ZZ minimizes current-dependent offset error, improving measurement resolution by >12-bit effective accuracy. |
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 | Same 7.5 V nominal VZ but ±5% tolerance (B suffix); no e3 RoHS marking; bulk packaging | Acceptable where tighter tolerance not required; unsuitable for lead-free assembly without re-plating | Select when cost sensitivity outweighs precision and RoHS compliance requirements |
| MMSZ5234B-TP | Surface-mount SOD-123 package; 7.5 V ±5%; 500 mW rating; 30 Ω ZZ; 100 mA IZM | Limited to low-power biasing; cannot replace 1N5343CE3/TR12 in 5 W regulation roles due to power/thermal limits | Choose only for space-constrained PCBs where power demand ≤ 0.5 W and thermal design precludes axial leads |
Compared with 1N5343B and MMSZ5234B-TP, the 1N5343CE3/TR12 uniquely combines ±2% tolerance, 5 W power handling, RoHS-compliant plating, and tape-and-reel delivery - making it optimal for high-reliability industrial power references requiring both precision and manufacturability.
Availability
1N5343CE3/TR12 is available at Aetrix Electronics and suitable for industrial power supply reference, overvoltage clamping, and programmable voltage monitoring applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for 1N5343CE3/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N53xx series was engineered for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal robustness, wide temperature operation, and military-grade screening compatibility.
FAQ
What is the Zener voltage tolerance of the 1N5343CE3/TR12?
The 1N5343CE3/TR12 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in its part number. This means its actual breakdown voltage falls within 7.35 V to 7.65 V at 175 mA and 25 °C. The tight tolerance supports high-accuracy voltage references without trimming, unlike the ±5% 1N5343B variant.
Does the 1N5343CE3/TR12 meet RoHS requirements?
Yes, the 1N5343CE3/TR12 complies with RoHS Directive 2011/65/EU, confirmed by the "e3" suffix indicating matte-tin lead plating and halogen-free epoxy encapsulation. It supports lead-free reflow soldering up to 260 °C for 10 seconds per JEDEC J-STD-020.
What is the maximum continuous Zener current for the 1N5343CE3/TR12?
The 1N5343CE3/TR12 supports a maximum continuous Zener current (IZM) of 630 mA when operated at lead temperature (TL) below 25 °C with 10 mm lead length from the body. At ambient temperature on FR4 board, derating applies - delivering ~1.47 W at TA = 25 °C.
How is polarity marked on the 1N5343CE3/TR12?
The 1N5343CE3/TR12 uses a cathode band - a single colored ring near one end of the axial package - to indicate the cathode terminal. For correct reverse-bias operation, the banded end must be held at a higher potential than the anode (unbanded) end to achieve Zener conduction and voltage regulation.
What packaging format does the 1N5343CE3/TR12 use?
The 1N5343CE3/TR12 ships in EIA-296 standard tape-and-reel format, indicated by the "TR12" suffix. Each reel contains 1,200 units, enabling automated pick-and-place insertion despite its axial-leaded T-18 package - a key advantage over bulk-packaged variants like 1N5343B.
1N5343CE3/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:
- ±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
1N5343CE3/TR12 FAQ
1.How can I place an order for 1N5343CE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5343CE3/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 1N5343CE3/TR12 reliable?
The price and inventory of 1N5343CE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5343CE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5343CE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5343CE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5343CE3/TR12?
1N5343CE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5343CE3/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 1N5343CE3/TR12?
For technical support, including 1N5343CE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5343CE3/TR12 requirements.
6.How does Aetrix verify that 1N5343CE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5343CE3/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 1N5343CE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5343CE3/TR12?
All 1N5343CE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5343CE3/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 1N5343CE3/TR12 part is unused and in its original packaging.
Return procedure for 1N5343CE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5343CE3/TR12 Tags
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