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Microchip Technology 1N5343/TR8
- Part No.:
- 1N5343/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5343/TR8.pdf
- Description:
- DIODE ZENER 7.5V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:8,914
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Product details
Overview
1N5343/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 7.5 V, ±5% tolerance (B-suffix implied by TR8 packaging context), 175 mA test current, and 1.5 Ω maximum dynamic impedance at IZT. 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 1N5343/TR8 datasheet, 1N5343/TR8 pinout, 1N5343/TR8 application, or 1N5343/TR8 equivalent, key selection criteria include Zener voltage stability under varying load current, thermal resistance (25 °C/W junction-to-lead), surge current rating (630 A), voltage regulation ΔVZ (0.15 V), 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, maintaining stable output across 10–50% of its maximum Zener current (IZM = 630 mA). Its low dynamic impedance (1.5 Ω) and tight voltage regulation (ΔVZ = 0.15 V) ensure minimal output drift with load variation.
The 1N5343/TR8 uses a void-free thermosetting epoxy T-18 package with cathode band marking, rated for 5.0 W steady-state dissipation at 25 °C lead temperature and 1.47 W on FR4 PCB. It withstands 8.3 ms half-sine surge currents up to 630 A and exhibits ESD insensitivity per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±5% - precise reference point for feedback loops and clamping circuits |
| Test Current (IZT) | 175 mA dc - defined operating point for guaranteed VZ and ZZ specification |
| Dynamic Impedance (ZZ) | 1.5 Ω max - low AC resistance ensures minimal voltage shift under dynamic load changes |
| Max Regulator Current (IZM) | 630 mA - maximum continuous DC current before thermal derating begins |
| Surge Current (IZSM) | 630 A peak (8.3 ms half-sine) - supports transient overvoltage suppression without failure |
| Voltage Regulation (ΔVZ) | 0.15 V - difference between VZ measured at 10% and 50% of IZM, indicating line regulation quality |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables high-power operation with minimal heatsinking at 3/8″ lead length |
Pinout & Package
T-18 axial-leaded plastic package with cathode indicated by color band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026. Weight: 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased reference terminal | Connected to circuit ground or lower potential node during regulation |
| Cathode | Zener breakdown terminal | Banded end; connected to regulated voltage rail; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Industry-standard footprint and electrical behavior for drop-in compatibility in legacy designs |
| Moisture sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out prior to assembly |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - robust against electrostatic discharge during handling and assembly |
| High surge current capability | 630 A peak (8.3 ms) - provides reliable transient suppression without derating or external crowbar |
| Low voltage regulation (ΔVZ) | 0.15 V - ensures stable reference under variable load conditions typical in feedback networks |
Applications
| DC Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
|
Use Scenario: Stabilizing output voltage in unregulated linear power supplies feeding analog instrumentation. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing fixed 7.5 V reference for error amplifier feedback. Use Value: Maintains ±0.15 V output variation across 63–315 mA load range, eliminating need for active regulation in cost-sensitive systems. |
Use Scenario: Clamping induced transients on 12 V automotive control bus lines exposed to load dump events. IC Role / Device Role / Timing Role: Passive voltage clamp limiting rail excursions to ≤7.5 V during surge events. Use Value: Absorbs 630 A surge energy without degradation, protecting downstream 5 V logic via series resistor and LDO. |
| Industrial Sensor Excitation | Calibration Reference Source |
|
Use Scenario: Providing stable excitation voltage to resistive bridge sensors in process control transmitters. IC Role / Device Role / Timing Role: Precision voltage source referenced to system ground, driving Wheatstone bridge arms. Use Value: Delivers 7.5 V ±0.375 V over –40 °C to +85 °C ambient, enabling <1% full-scale error in 4–20 mA loop outputs. |
Use Scenario: Serving as traceable voltage standard in portable multimeter calibration fixtures. IC Role / Device Role / Timing Role: Primary Zener reference in two-resistor divider network generating 2.500 V benchmark. Use Value: Achieves 0.15 V regulation delta and 1.5 Ω ZZ, supporting <0.01% accuracy when combined with 0.01% metal-film resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5343B | Same Zener voltage (7.5 V), ±5% tolerance, identical electrical specs; differs only in packaging - bulk vs. tape-and-reel (TR8) | No functional difference; TR8 variant optimized for automated pick-and-place, while 1N5343B is loose-packed | Select 1N5343/TR8 for SMT production; choose 1N5343B for manual prototyping or repair |
| MMSZ5231B-TP | Surface-mount SOD-123 package; same 7.5 V ±5%, but lower power rating (500 mW), higher ZZ (7 Ω), and IZM = 65 mA | Not suitable for 5 W thermal loads; limited to low-current biasing or signal-level clamping | Use MMSZ5231B-TP only where board space is constrained and power dissipation remains below 0.5 W |
Compared with 1N5343/TR8, the 1N5343B offers identical regulation performance in bulk form, while MMSZ5231B-TP trades power handling and impedance for miniaturization - making the TR8 version optimal for high-reliability 5 W applications requiring axial-lead mechanical robustness and thermal margin.
Availability
1N5343/TR8 is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection circuits, and industrial sensor excitation requiring stable component supply with consistent parametric performance and JEDEC-standard reliability.
Supply support for 1N5343/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 radiation-hardened components for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized 5 W voltage regulation in harsh-environment power systems where thermal stability, surge immunity, and long-term parametric consistency are critical.
FAQ
What is the Zener voltage tolerance of 1N5343/TR8?
The 1N5343/TR8 carries a B suffix by JEDEC convention when supplied in TR8 tape-and-reel packaging, indicating a ±5% Zener voltage tolerance. Its nominal VZ is 7.5 V, so the actual regulation range is 7.125 V to 7.875 V at 175 mA test current and 25 °C lead temperature. This tolerance is confirmed in the manufacturer's electrical characteristics table for 1N5343B devices.
Can 1N5343/TR8 be used in surface-mount designs?
No, the 1N5343/TR8 is an axial-leaded T-18 package and is not compatible with surface-mount assembly processes. For SMT equivalents, Microsemi offers the SMBJ5343B (DO-214AA) and SMBG5343B (DO-215AB) families. The 1N5343/TR8 requires through-hole mounting with 3/8″ (10 mm) lead length from body for rated 5 W dissipation.
What is the maximum surge current rating for 1N5343/TR8?
The 1N5343/TR8 has a maximum non-recurrent surge current (IZSM) of 630 A, specified for an 8.3 ms half-sine waveform. This rating is validated under JEDEC test conditions and reflects the device's ability to absorb transient energy without parametric shift or catastrophic failure, making it suitable for automotive load-dump and industrial switching-spike protection.
Is 1N5343/TR8 RoHS compliant?
Yes, the 1N5343/TR8 is RoHS compliant, as indicated by the "e3" suffix in Microsemi's official documentation. Its terminals use annealed matte-tin plating per MIL-STD-750, and the void-free epoxy case meets UL94V-0 flammability requirements - satisfying EU Directive 2011/65/EU and related exemptions.
How does thermal resistance affect 1N5343/TR8 power handling?
The 1N5343/TR8 has a junction-to-lead thermal resistance (RθJL) of 25 °C/W. At 3/8″ lead length, this allows full 5.0 W dissipation at 25 °C lead temperature. On FR4 PCB with 1 oz copper, RθJA rises to 85 °C/W, limiting steady-state power to 1.47 W at 25 °C ambient - underscoring the need for proper heatsinking or lead-length optimization in high-power use of the 1N5343/TR8.
1N5343/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:
- ±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
1N5343/TR8 FAQ
1.How can I place an order for 1N5343/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5343/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 1N5343/TR8 reliable?
The price and inventory of 1N5343/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5343/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5343/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5343/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5343/TR8?
1N5343/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5343/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 1N5343/TR8?
For technical support, including 1N5343/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5343/TR8 requirements.
6.How does Aetrix verify that 1N5343/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5343/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 1N5343/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5343/TR8?
All 1N5343/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5343/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 1N5343/TR8 part is unused and in its original packaging.
Return procedure for 1N5343/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5343/TR8 Tags
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