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Microchip Technology 1N5342A/TR12
- Part No.:
- 1N5342A/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5342A/TR12.pdf
- Description:
- DIODE ZENER 6.8V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:7,493
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Product details
Overview
1N5342A/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 6.8 V, ±10% tolerance (A suffix), 175 mA maximum Zener test current (IZT), 700 Ω maximum dynamic impedance (ZZ), and 11.5 mA maximum reverse leakage current at 5.2 V. It operates across –65 °C to +150 °C and serves as a precision voltage reference in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the 1N5342A/TR12 datasheet, 1N5342A/TR12 pinout, 1N5342A/TR12 application, or 1N5342A/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (11.5 A), voltage regulation (ΔVZ = 0.15 V), and RoHS-compliant tape-and-reel packaging (TR12).
Technical Context
This discrete Zener diode functions exclusively in reverse-biased breakdown mode, with cathode indicated by a band and required to be held positive relative to the anode. Its regulation performance is specified at 25 °C lead temperature (TL), with voltage measured 40 ±10 ms after DC current application.
Thermal design relies on junction-to-lead thermal resistance of 25 °C/W at 10 mm lead length, enabling 5 W steady-state dissipation only with adequate heat sinking; mounted on FR4 PCB it derates to 1.47 W at 25 °C ambient. Dynamic impedance is measured using 1 kHz AC modulation at 10% of IZT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.8 V ±10% - defines stable regulation point under reverse bias at IZT = 175 mA |
| Power Dissipation | 5.0 W at TL = 25 °C - requires mechanical heat sinking for full-rated operation |
| Dynamic Impedance (ZZ) | 1.0 Ω max - low impedance ensures minimal voltage shift across operating current range |
| Reverse Leakage Current | 10 μA max at VR = 5.2 V - confirms tight cutoff below knee voltage |
| Surge Current (IZSM) | 11.5 A peak (8.3 ms half-sine) - supports transient overvoltage clamping |
| Voltage Regulation (ΔVZ) | 0.15 V - difference between VZ at 10% and 50% of IZM, indicating regulation linearity |
| Forward Voltage | 1.2 V max at 1.0 A - defines conduction drop when used as rectifier in fault conditions |
Pinout & Package
Package: Axial-leaded T-18 plastic case per JEDEC DO-204AL; void-free UL94V-0 epoxy body; tin-lead or RoHS-compliant matte-tin plating; cathode identified by color band; weight 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node in shunt regulator configuration | Connected to system ground or lower-potential rail; carries full load current when regulating |
| Cathode | Regulated output node | Banded end; held at precise VZ above anode; supplies reference voltage to error amplifier or clamp circuit |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Ensures standardized electrical behavior and interchangeability across qualified suppliers |
| 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 - withstands human-body-model discharges without parameter shift |
| High surge current capability | 11.5 A non-recurrent half-sine pulse - enables robust overvoltage protection without external crowbar |
| Low thermal resistance | 25 °C/W junction-to-lead - supports high-power operation with minimal heatsink mass when leads are thermally anchored |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 6.8 V threshold to TL431 or similar error amplifier. Use Value: Maintains ±1% output accuracy across line/load/temperature with minimal drift due to low ΔVZ and tight thermal coupling to PCB copper. |
Use Scenario: Supplies stable excitation voltage to resistive bridge sensors in process control transmitters. IC Role / Device Role / Timing Role: Precision analog reference source replacing higher-cost IC references where 10% tolerance is acceptable. Use Value: Delivers 6.8 V ±10% at <100 ppm/°C TC over –40 °C to +85 °C, reducing calibration burden in field-deployed instrumentation. |
| Overvoltage Clamp Circuit | Programmable Threshold Detector |
Use Scenario: Protects microcontroller I/O pins against 12 V rail transients in automotive body electronics. IC Role / Device Role / Timing Role: Fast-acting shunt clamp activated above 6.8 V, diverting surge energy to ground before damage occurs. Use Value: Withstands 11.5 A 8.3 ms surges without degradation, eliminating need for TVS diodes in cost-sensitive 12 V systems. |
Use Scenario: Sets trip point for comparator-based battery undervoltage lockout in portable medical devices. IC Role / Device Role / Timing Role: Fixed-voltage threshold element defining 6.8 V cutoff level for Li-ion battery monitoring. Use Value: Provides predictable turn-on hysteresis via series resistor, leveraging low ZZ to minimize threshold variation with supply ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5342B/TR13 | Same 6.8 V nominal VZ, but ±5% tolerance (B suffix) and 1.0 Ω max ZZ vs. 1.0 Ω for 1N5342A/TR12; identical IZM, IZSM, and thermal specs | Used where tighter voltage tolerance is required for feedback accuracy, e.g., in telecom power modules demanding ±0.5% output regulation | Select 1N5342B/TR13 when VZ stability across unit-to-unit variation is critical; same footprint and thermal profile |
| MMBZ5235B-TP | Surface-mount SOD-123 package; 6.8 V ±5%; 500 mW rating; 10 Ω ZZ; not rated for 5 W continuous dissipation | Intended for low-power signal-level clamping or biasing, not primary power regulation or surge suppression | Choose MMBZ5235B-TP only for space-constrained PCBs with <100 mA load currents; cannot replace 1N5342A/TR12 in 5 W applications |
Compared with 1N5342B/TR13, the 1N5342A/TR12 offers relaxed tolerance at lower cost for less critical regulation tasks; versus MMBZ5235B-TP, it delivers 10× higher power handling and 10× lower dynamic impedance, making it suitable for primary power rail stabilization rather than signal conditioning.
Availability
1N5342A/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and test equipment requiring stable component supply with RoHS-compliant tape-and-reel packaging.
Supply support for 1N5342A/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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N53xxA/B series targets cost-effective, high-stability voltage regulation in harsh environments, emphasizing wide temperature range (–65 °C to +150 °C), surge resilience, and JEDEC-standardized performance.
FAQ
What is the Zener voltage tolerance of the 1N5342A/TR12?
The 1N5342A/TR12 has a Zener voltage tolerance of ±10%, indicated by the "A" suffix in its part number. This means its actual regulation voltage falls within 6.12 V to 7.48 V at 175 mA test current and 25 °C lead temperature. The tolerance is confirmed in Microsemi's official datasheet revision D (2008), Table "ELECTRICAL CHARACTERISTICS @ 25oC".
Can the 1N5342A/TR12 be used without a heatsink?
The 1N5342A/TR12 can dissipate up to 5.0 W only when lead temperature (TL) is maintained at 25 °C - which requires direct thermal anchoring of leads to large copper areas or external heatsinks. On standard FR4 PCB with 4 mm² pads, its steady-state rating drops to 1.47 W at 25 °C ambient; exceeding this without heatsinking risks thermal runaway and permanent failure.
What does the "TR12" suffix mean in 1N5342A/TR12?
The "TR12" suffix indicates tape-and-reel packaging per EIA-296 standard, with 12,000 units per reel. This format supports automated SMT placement despite the device's axial-leaded construction, and is RoHS-compliant per the "e3" designation in the full family documentation. The TR option is explicitly listed in the "MECHANICAL AND PACKAGING" section of the datasheet.
How does the 1N5342A/TR12 handle surge events?
The 1N5342A/TR12 is rated for 11.5 A peak non-recurrent surge current (IZSM) in an 8.3 ms half-sine waveform, verified per JEDEC test conditions. This enables reliable clamping of automotive load-dump transients or power-supply overshoot without degradation, provided the average power remains within 5 W derated limits and the device is not subjected to repeated surges.
Is the 1N5342A/TR12 compatible with lead-free soldering processes?
Yes - the 1N5342A/TR12 features RoHS-compliant matte-tin plating qualified for soldering at 260 °C for 10 seconds maximum, matching IPC/JEDEC J-STD-020B Level 1 moisture sensitivity. Its UL94V-0 epoxy body withstands lead-free reflow profiles without cracking or delamination, and no pre-bake is required due to its Level 1 classification.
1N5342A/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):
- 6.8 V
- Tolerance:
- ±10%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 1 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 4.9 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
1N5342A/TR12 FAQ
1.How can I place an order for 1N5342A/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5342A/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 1N5342A/TR12 reliable?
The price and inventory of 1N5342A/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5342A/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5342A/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5342A/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5342A/TR12?
1N5342A/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5342A/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 1N5342A/TR12?
For technical support, including 1N5342A/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5342A/TR12 requirements.
6.How does Aetrix verify that 1N5342A/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5342A/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 1N5342A/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5342A/TR12?
All 1N5342A/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5342A/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 1N5342A/TR12 part is unused and in its original packaging.
Return procedure for 1N5342A/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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