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Microchip Technology 1N5343E3/TR12
- Part No.:
- 1N5343E3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5343E3/TR12.pdf
- Description:
- DIODE ZENER 7.5V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,234
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Product details
Overview
1N5343E3/TR12 from Microsemi is a 5.0 W axial-leaded silicon Zener diode with a nominal regulation voltage of 7.5 V ±5%, test current of 175 mA, dynamic impedance of 1.5 Ω at IZT, and maximum surge current of 20 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 DC power supplies.
For engineers reviewing the 1N5343E3/TR12 datasheet, 1N5343E3/TR12 pinout, 1N5343E3/TR12 application, or 1N5343E3/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), steady-state power rating at lead temperature, reverse leakage at specified test voltage, and RoHS-compliant matte-tin plating per MIL-STD-750.
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 with ±5% tolerance (B-suffix equivalent), measured at 175 mA dc test current and 25 °C lead temperature, with dynamic impedance of 1.5 Ω under those conditions.
The 1N5343E3/TR12 exhibits low voltage regulation drift (ΔVZ = 0.15 V between 10% and 50% of IZM) and supports high surge capability (20 A peak, 8.3 ms) due to its 5.0 W rated power dissipation and thermally optimized T-18 package with 3/8″ lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±5% - stable regulation point for reference and clamp circuits |
| Test Current (IZT) | 175 mA dc - defines nominal operating point for VZ and ZZ measurement |
| Dynamic Impedance (ZZ) | 1.5 Ω at IZT - low AC impedance ensures minimal output voltage variation under load transients |
| Max Surge Current (IZSM) | 20 A (8.3 ms half-sine) - withstands short-duration overvoltage events without failure |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables 5.0 W power dissipation with adequate heat sinking at 3/8″ lead length |
| Reverse Leakage (IR) | 10 µA max at 5.4 V - ensures low standby power loss in high-impedance bias networks |
| Operating Temperature | −65 °C to +150 °C - suitable for automotive under-hood and industrial control environments |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC DO-41 outline; void-free UL94V-0 epoxy body; cathode indicated by band; leads plated with RoHS-compliant annealed matte tin 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; held at stable 7.5 V relative to anode when reverse current ≥175 mA |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant construction | e3 suffix confirms lead-free matte-tin plating and UL94V-0 epoxy, meeting environmental compliance without derating |
| Tight voltage tolerance | ±5% (B-suffix equivalent) enables accurate reference generation without post-calibration in mid-precision analog circuits |
| Low voltage regulation drift | ΔVZ = 0.15 V across 10–50% of IZM ensures stable clamping during varying load currents |
| High surge survivability | 20 A non-recurrent surge rating allows use in transient-prone power rails without external TVS supplementation |
| Moisture sensitivity level | Level 1 per J-STD-020B - no dry pack required, simplifying handling and assembly logistics |
Applications
| Power Supply Voltage Reference | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Providing stable 7.5 V reference for linear regulator feedback or ADC reference buffer in industrial PLC power modules. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference element operating in reverse breakdown. Use Value: Delivers ±5% accuracy and 1.5 Ω dynamic impedance to maintain <10 mV output variation under 50–200 mA load steps. | Use Scenario: Protecting 8 V-rated op-amp inputs from ESD-induced transients in sensor signal conditioning front-ends. IC Role / Device Role / Timing Role: Shunt overvoltage protector clamping reverse voltage to ≤7.65 V (max VZ + ΔVZ). Use Value: Absorbs 20 A surge (8.3 ms) without degradation, preserving downstream IC integrity per IEC 61000-4-2 Level 4. |
| DC-DC Converter Feedback Divider | Temperature-Stable Bias Network |
Use Scenario: Setting output voltage in isolated flyback converters where primary-side sensing uses optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Precision Zener element in resistive divider network defining regulated output setpoint. Use Value: Maintains regulation within ±0.15 V across −40 °C to +85 °C ambient due to low ΔVZ and specified thermal coefficient. | Use Scenario: Generating stable bias current for differential pair amplifiers in telecom line drivers requiring low thermal drift. IC Role / Device Role / Timing Role: Fixed-voltage reference establishing base-emitter voltage drop across series resistor. Use Value: Enables <0.5% bias current variation over full operating temperature range using matched transistor pairs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5343B | Same 7.5 V ±5%, identical electrical specs, but SnPb lead finish (non-RoHS) | Not suitable for RoHS-compliant production; otherwise functionally interchangeable | Select 1N5343E3/TR12 for lead-free manufacturing; choose 1N5343B only for legacy repair or exempt applications |
| MMSZ5234B-TP | Surface-mount SOD-123 package; 7.5 V ±5%; lower power (500 mW); ZZ = 7 Ω at 20 mA | Not suitable for 5 W dissipation; limited to low-current bias/reference roles | Use MMSZ5234B-TP only in space-constrained, low-power designs where thermal mass is insufficient for axial-leaded mounting |
Compared with 1N5343B and MMSZ5234B-TP, the 1N5343E3/TR12 uniquely combines RoHS compliance, 5 W power handling, and axial-leaded mechanical robustness-making it optimal for industrial power supply and surge protection where thermal management and regulatory conformance are both critical.
Availability
1N5343E3/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, telecom DC-DC converters, and sensor interface protection circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N5343E3/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 discrete components for aerospace, defense, and industrial markets.
The 1N53xx series was designed specifically for ruggedized 5 W voltage regulation in harsh-environment power systems-emphasizing thermal stability, surge resilience, and extended temperature operation.
FAQ
What is the Zener voltage tolerance of the 1N5343E3/TR12?
The 1N5343E3/TR12 has a Zener voltage tolerance of ±5%, consistent with the B-suffix variant in the 1N5333B–1N5388B family. This is confirmed in the Electrical Characteristics table where the "TYPE NUMBER" row for 1N5343B lists VZ = 7.5 V and the footnote states that B-suffix devices carry ±5% tolerance. The e3 suffix denotes RoHS compliance but does not alter voltage tolerance.
Does the 1N5343E3/TR12 require dry packing before PCB assembly?
No, the 1N5343E3/TR12 does not require dry packing. Its moisture sensitivity level is rated Level 1 per IPC/JEDEC J-STD-020B, meaning it may be stored and assembled indefinitely at standard factory conditions without baking or humidity-controlled packaging. This simplifies handling and reduces manufacturing overhead.
What is the maximum steady-state power dissipation of the 1N5343E3/TR12 at 25 °C ambient?
The 1N5343E3/TR12 delivers 5.0 W steady-state power dissipation only when mounted with 3/8″ (10 mm) lead length from the body and lead temperature (TL) maintained at ≤25 °C. When mounted on FR4 with 1 oz copper, its usable power drops to 1.47 W at 25 °C ambient due to higher junction-to-ambient thermal resistance (85 °C/W).
Can the 1N5343E3/TR12 be used as a direct replacement for the 1N5343B?
Yes, the 1N5343E3/TR12 is electrically and mechanically identical to the 1N5343B except for its RoHS-compliant matte-tin plating (e3 vs. SnPb). All electrical parameters-including VZ, IZT, ZZ, IZM, and thermal resistance-are identical. No PCB layout or schematic changes are needed for substitution in new designs.
What is the reverse leakage current specification for the 1N5343E3/TR12?
The reverse leakage current (IR) for the 1N5343E3/TR12 is specified as 10 µA maximum at a reverse test voltage (VR) of 5.4 V. This value appears in the Electrical Characteristics table under the "MAXIMUM REVERSE CURRENT (IR)" column for type number 1N5343B, and applies identically to the e3 variant since the semiconductor die and process are unchanged.
1N5343E3/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:
- ±20%
- 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
1N5343E3/TR12 FAQ
1.How can I place an order for 1N5343E3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5343E3/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 1N5343E3/TR12 reliable?
The price and inventory of 1N5343E3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5343E3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5343E3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5343E3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5343E3/TR12?
1N5343E3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5343E3/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 1N5343E3/TR12?
For technical support, including 1N5343E3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5343E3/TR12 requirements.
6.How does Aetrix verify that 1N5343E3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5343E3/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 1N5343E3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5343E3/TR12?
All 1N5343E3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5343E3/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 1N5343E3/TR12 part is unused and in its original packaging.
Return procedure for 1N5343E3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5343E3/TR12 Tags
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