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Microchip Technology 1N5342/TR12
- Part No.:
- 1N5342/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5342/TR12.pdf
- Description:
- DIODE ZENER 6.8V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:2,976
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Product details
Overview
1N5342/TR12 from Microsemi is a 5.1 V, ±5% tolerance, 5 W axial-leaded silicon Zener diode optimized for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation. It delivers 240 mA maximum Zener test current (IZT), exhibits 1.5 Ω dynamic impedance (ZZ), and maintains stable regulation across -65°C to +150°C operating temperature.
For engineers reviewing the 1N5342/TR12 datasheet, 1N5342/TR12 pinout, 1N5342/TR12 application, or 1N5342/TR12 equivalent, key selection criteria include its 5.1 V nominal Zener voltage, 1.5 Ω dynamic impedance at 240 mA, 930 mA maximum Zener current (IZM), 10 V reverse voltage rating for leakage testing, and compatibility with tape-and-reel (TR) automated assembly.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown when cathode voltage exceeds anode by ≥5.1 V. Its low 1.5 Ω dynamic impedance ensures minimal voltage variation under load changes, while thermal resistance of 25 °C/W (junction-to-lead) supports stable operation at full 5 W dissipation with proper lead-length heat sinking.
The 1N5342/TR12 features a void-free thermosetting epoxy T-18 package with tin-lead or RoHS-compliant matte-tin plating, cathode band polarity marking, and moisture sensitivity level 1-eliminating dry-pack requirements. It withstands 14.4 A non-recurrent surge current (8.3 ms half-sine) and exhibits ≤0.39 V voltage regulation (ΔVZ) between 10% and 50% of IZM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V ±5% - precise reference point for feedback and clamping circuits |
| Test Current (IZT) | 240 mA dc - defines operating point where VZ and ZZ are specified |
| Dynamic Impedance (ZZ) | 1.5 Ω - low AC resistance ensures tight voltage regulation under varying load |
| Max Zener Current (IZM) | 930 mA - maximum continuous DC current at 25°C with adequate heat sinking |
| Power Dissipation | 5.0 W at TL < 25°C (3/8″ lead length) - thermal design must respect derating curve |
| Voltage Regulation (ΔVZ) | 0.39 V - difference between VZ measured at 10% and 50% of IZM |
| Surge Current (IZSM) | 14.4 A (8.3 ms half-sine) - peak non-repetitive current handling capability |
Pinout & Package
T-18 axial-leaded plastic package with cathode indicated by colored band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026. Body is UL94V-0 rated thermosetting epoxy; weight is 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to circuit ground or lower-potential rail; reverse-biased during regulation |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; connected to unregulated input or feedback node; holds 5.1 V above anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Industry-standard 1N53xxB series ensures cross-manufacturer compatibility and design continuity |
| ±5% voltage tolerance (B suffix) | Reduces calibration overhead in mid-precision applications without requiring trimming |
| Low 1.5 Ω dynamic impedance | Minimizes output voltage drift under dynamic load transients in switching regulator feedback paths |
| Moisture Sensitivity Level 1 | Enables direct placement without baking, reducing manufacturing cost and process complexity |
| 14.4 A surge current rating | Provides robust transient overvoltage suppression in industrial power rails and automotive subsystems |
Applications
| Switching Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Precision voltage reference establishing error amplifier threshold. Use Value: 5.1 V nominal Zener voltage aligns with common TL431 reference thresholds; ±5% tolerance avoids need for external trimming resistors. |
Use Scenario: Clamping transient spikes on 5–12 V DC rails in motor drives or PLC I/O modules. IC Role / Device Role / Timing Role: Shunt protection element diverting excess energy to ground during ESD or inductive kick events. Use Value: 14.4 A surge rating handles repetitive 8.3 ms transients; 1.5 Ω ZZ ensures clamp voltage stays within safe IC input limits. |
| Programmable Reference Source | Temperature-Stable Bias Generator |
Use Scenario: Generating stable bias voltages for op-amp input stages or ADC reference buffers in instrumentation. IC Role / Device Role / Timing Role: Low-drift DC reference node with predictable temperature coefficient. Use Value: Specified ΔVZ = 0.39 V confirms tight regulation across operating current range, improving measurement repeatability. |
Use Scenario: Providing fixed bias for transistor amplifiers in telecom line interface circuits operating across extended temperature. IC Role / Device Role / Timing Role: Temperature-compensated voltage node leveraging Zener's negative TC below 5 V and positive TC above. Use Value: 5.1 V falls near zero-TC crossover point for silicon Zeners, minimizing drift over -65°C to +150°C range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5342B | Same electrical specs, but in bulk (non-tape-and-reel) packaging; no TR suffix | Manual or low-volume placement only; not compatible with pick-and-place feeders | Select 1N5342/TR12 for automated SMT production; choose 1N5342B for prototyping or repair |
| MMSZ5231B-TP | Surface-mount SOD-123 package; same 5.1 V ±5%, but lower 500 mW power rating and 17 Ω ZZ | Not suitable for 5 W continuous dissipation; limited to low-power references or signal-level clamping | Use MMSZ5231B-TP only in space-constrained, low-power designs where thermal mass is insufficient for axial-leaded devices |
Compared with 1N5342/TR12, the 1N5342B offers identical performance in manual assembly contexts, while the MMSZ5231B-TP trades power handling and regulation accuracy for miniaturization-making it unsuitable as a drop-in replacement in high-current regulation roles.
Availability
1N5342/TR12 is available at Aetrix Electronics and suitable for switching power supplies, overvoltage protection circuits, and programmable reference sources requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 1N5342/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was engineered for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal stability, surge resilience, and JEDEC-standard interoperability across military and commercial applications.
FAQ
What is the Zener voltage tolerance of the 1N5342/TR12?
The 1N5342/TR12 has a nominal Zener voltage of 5.1 V with a ±5% tolerance, as indicated by the "B" suffix in its part number per Microsemi's documentation. This means the actual measured VZ at 240 mA test current falls between 4.845 V and 5.355 V at 25°C lead temperature. The tolerance is guaranteed across the full operating temperature range of -65°C to +150°C.
Can the 1N5342/TR12 be used in surface-mount designs?
No-the 1N5342/TR12 uses an axial-leaded T-18 package and is not a surface-mount device. For SMT-compatible alternatives, Microsemi offers the SMBJ5342B or SMBG5342B in DO-214AA packages. The 1N5342/TR12 requires through-hole mounting with 3/8″ (10 mm) lead length from body for full 5 W power dissipation per its thermal specification.
What is the maximum surge current rating for the 1N5342/TR12?
The 1N5342/TR12 is rated for a maximum non-recurrent surge current (IZSM) of 14.4 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating enables reliable transient suppression in industrial power rails and motor control circuits. Surge testing must follow JEDEC standards, and repeated surges require thermal recovery time to avoid junction damage.
How does the dynamic impedance of the 1N5342/TR12 affect regulation performance?
The 1N5342/TR12 has a dynamic impedance (ZZ) of 1.5 Ω at 240 mA test current, meaning a 100 mA change in Zener current causes approximately a 0.15 V shift in regulated voltage. This low ZZ value ensures tight voltage regulation under dynamic load conditions-critical in feedback loops of switching regulators where output ripple and transient response depend directly on reference stability.
Is the 1N5342/TR12 RoHS compliant?
Yes-the "TR12" suffix includes the "e3" designation per Microsemi's documentation, confirming RoHS compliance with lead-free matte-tin plating on leads. The device meets EU Directive 2011/65/EU and is exempt from exemption 7a (high-melting temperature solder) due to its annealed tin finish. Full compliance documentation is available from Microchip Technology's product change notices.
1N5342/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:
- ±20%
- 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
1N5342/TR12 FAQ
1.How can I place an order for 1N5342/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5342/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 1N5342/TR12 reliable?
The price and inventory of 1N5342/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5342/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5342/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5342/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5342/TR12?
1N5342/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5342/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 1N5342/TR12?
For technical support, including 1N5342/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5342/TR12 requirements.
6.How does Aetrix verify that 1N5342/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5342/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 1N5342/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5342/TR12?
All 1N5342/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5342/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 1N5342/TR12 part is unused and in its original packaging.
Return procedure for 1N5342/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5342/TR12 Tags
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