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Microchip Technology 1N5343E3/TR13
- Part No.:
- 1N5343E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5343E3/TR13.pdf
- Description:
- DIODE ZENER 7.5V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:2,344
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Product details
Overview
1N5343E3/TR13 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 7.5 V, ±5% tolerance (B-suffix equivalent), 175 mA test current (IZT), 1.5 Ω dynamic impedance (ZZ), and 630 mA maximum Zener current (IZM) at 25°C. It operates across –65°C to +150°C and is used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5343E3/TR13 datasheet, 1N5343E3/TR13 pinout, 1N5343E3/TR13 application, or 1N5343E3/TR13 equivalent, key selection criteria include its 7.5 V regulation stability under varying load currents, low 1.5 Ω dynamic impedance, RoHS-compliant matte-tin plating, and T-18 axial package compatibility with manual and wave soldering per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage regulator, maintaining stable reverse-biased conduction above its 7.5 V breakdown threshold. Its thermal resistance is 25 °C/W junction-to-lead (at 10 mm lead length) and 85 °C/W junction-to-ambient on FR4 PCB, enabling reliable 5 W dissipation with minimal heatsinking.
It exhibits 0.15 V voltage regulation (ΔVZ) between 10% and 50% of IZM, confirming tight regulation across operating current range. The cathode band identifies polarity, and forward voltage is ≤1.2 V at 1.0 A - consistent with standard silicon PN-junction behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±5% - defines precise regulation point for feedback and clamping circuits |
| Test Current (IZT) | 175 mA - current at which VZ is specified; sets minimum stable operating point |
| Dynamic Impedance (ZZ) | 1.5 Ω - low impedance ensures minimal output voltage shift under load transients |
| Max Zener Current (IZM) | 630 mA - maximum continuous DC current before thermal runaway at TL = 25°C |
| Power Dissipation | 5.0 W at TL < 25°C - requires ≥10 mm lead length or heatsink for full rating |
| Operating Temp Range | –65°C to +150°C - supports industrial and automotive under-hood environments |
| Reverse Leakage (IR) | 10 μA max at VR = 5.4 V - ensures low standby power loss in high-impedance bias networks |
Pinout & Package
Package: T-18 axial-leaded plastic case (void-free UL94V-0 epoxy), 0.7 g weight, cathode indicated by colored band. Leads are annealed matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; reverse voltage applied across anode–cathode |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; supplies regulated 7.5 V when reverse-biased; connects to feedback node or clamp rail |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant e3 suffix | Matte-tin plating meets EU RoHS Directive 2011/65/EU without lead or hazardous substances |
| Moisture sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - simplifies SMT handling and storage |
| ESD robustness | Nonsensitive per MIL-STD-750 Method 1020 - withstands >4 kV HBM without parameter shift |
| Surge current rating | 200 A peak (8.3 ms half-sine) - protects against transient overvoltages in power rails |
| Low voltage regulation ΔVZ | 0.15 V - ensures ≤2% variation across 10–50% of IZM, critical for precision references |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp for 5 V Rail |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler feedback network. IC Role / Device Role / Timing Role: Zener reference providing stable 7.5 V threshold to TL431 or optocoupler LED drive circuit. Use Value: Enables ±1% output regulation accuracy by stabilizing reference voltage despite input line and load variations. |
Use Scenario: Clamps transient spikes on a 5 V logic rail caused by inductive switching or ESD events. IC Role / Device Role / Timing Role: Shunt protector diverting excess energy to ground when rail exceeds 7.5 V. Use Value: Limits voltage excursion to safe levels below IC absolute maximum ratings (e.g., 6.5 V for many 5 V logic families). |
| Industrial Sensor Excitation Reference | Programmable Current Source Bias |
Use Scenario: Supplies stable excitation voltage to resistive temperature detectors (RTDs) in PLC analog input modules. IC Role / Device Role / Timing Role: Precision voltage reference establishing known current through RTD via series resistor. Use Value: Reduces measurement error to <0.1% due to low ΔVZ and stable VZ over –40°C to +85°C ambient. |
Use Scenario: Sets bias point for op-amp-based constant-current source driving LED arrays or laser diodes. IC Role / Device Role / Timing Role: Stable reference defining current-setting resistor voltage drop in Howland or improved Howland topology. Use Value: Maintains current accuracy within ±2% over 10:1 load range thanks to low ZZ and high IZM headroom. |
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, ±5%, but non-RoHS tin-lead plating; no e3 suffix | Not compliant with RoHS or REACH; unsuitable for new EU-market designs | Select 1N5343B only for legacy repair or non-regulated markets where leaded finish is acceptable |
| MMSZ5235B-TP | Surface-mount SOD-123 package; 7.5 V ±5%; 200 mW rating; 10x lower power | Limited to low-power biasing; cannot replace 1N5343E3/TR13 in 5 W applications | Choose MMSZ5235B-TP only for space-constrained PCBs with <20 mA regulation current needs |
Compared with 1N5343B and MMSZ5235B-TP, the 1N5343E3/TR13 uniquely combines RoHS compliance, 5 W power handling, axial T-18 mounting flexibility, and industrial temperature range - making it the sole option for high-reliability, through-hole, medium-power Zener regulation.
Availability
1N5343E3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and test equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N5343E3/TR13 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 designed specifically for ruggedized, high-power voltage regulation in harsh-environment power systems - emphasizing thermal robustness, surge immunity, and long-term parametric stability.
FAQ
What is the Zener voltage tolerance of 1N5343E3/TR13?
The 1N5343E3/TR13 has a nominal Zener voltage of 7.5 V with a tolerance of ±5%, as confirmed by the "B"-equivalent specification in Microsemi's official datasheet and the e3 RoHS-compliant variant of the 1N5343B family. This tolerance applies across the full operating temperature range of –65°C to +150°C and is verified at 175 mA test current.
Can 1N5343E3/TR13 be used in surface-mount designs?
No - the 1N5343E3/TR13 uses a T-18 axial-leaded package and is not surface-mount compatible. For SMT equivalents, Microsemi offers the SMBJ5343B (DO-214AA) and SMBG5343B (DO-214AB), both rated for 5 W but requiring different PCB footprints and reflow profiles than the 1N5343E3/TR13.
What is the maximum surge current rating for 1N5343E3/TR13?
The 1N5343E3/TR13 has a maximum non-recurrent surge current (IZSM) of 200 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating enables reliable transient suppression in power supply inputs and motor drive circuits without degradation when operated within specified thermal limits.
How does the thermal resistance of 1N5343E3/TR13 affect its power handling?
The 1N5343E3/TR13 has a junction-to-lead thermal resistance of 25 °C/W at 10 mm lead length. To sustain full 5 W dissipation, leads must extend ≥10 mm from the body and be mounted to copper pours or heatsinks; otherwise, derating to 1.47 W is required when mounted on standard FR4 with 4 mm² pads per Microsemi's Figure 1 derating curve.
Is 1N5343E3/TR13 suitable for precision voltage reference applications?
Yes - the 1N5343E3/TR13 delivers 0.15 V voltage regulation (ΔVZ) between 10% and 50% of IZM, and its 1.5 Ω dynamic impedance ensures minimal output variation under dynamic load changes. While not a temperature-compensated reference like a bandgap IC, it provides adequate stability for cost-sensitive industrial references where ±2% total error is acceptable.
1N5343E3/TR13 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/TR13 FAQ
1.How can I place an order for 1N5343E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5343E3/TR13 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/TR13 reliable?
The price and inventory of 1N5343E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5343E3/TR13 is usually 5 days.
3.What payment methods are accepted for 1N5343E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5343E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5343E3/TR13?
1N5343E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5343E3/TR13 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/TR13?
For technical support, including 1N5343E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5343E3/TR13 requirements.
6.How does Aetrix verify that 1N5343E3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1N5343E3/TR13 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/TR13 meets industry standards.
7.What is the process for return or replacement of 1N5343E3/TR13?
All 1N5343E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5343E3/TR13, 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/TR13 part is unused and in its original packaging.
Return procedure for 1N5343E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5343E3/TR13 Tags
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