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Microchip Technology 1N5342/TR8
- Part No.:
- 1N5342/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5342/TR8.pdf
- Description:
- DIODE ZENER 6.8V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,379
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Product details
Overview
1N5342/TR8 from Microsemi is a 5.0 W axial-leaded silicon Zener diode with a nominal regulation voltage of 6.8 V ±5%, 175 mA test current, 1.0 Ω maximum dynamic impedance at IZT, and 700 mA maximum Zener current (IZM) when adequately heat-sunk. 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 1N5342/TR8 datasheet, 1N5342/TR8 pinout, 1N5342/TR8 application, or 1N5342/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (11.5 A), reverse leakage performance at VR = 5.2 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. Its Zener voltage is specified at 25°C with 175 mA test current (IZT), and it maintains regulation across a wide current range (10%–50% of IZM) with ≤0.15 V voltage regulation (ΔVZ).
It features low dynamic impedance (1.0 Ω max at IZT), high surge current capability (11.5 A peak, 8.3 ms half-sine), and moisture sensitivity level 1 per J-STD-020B-no dry pack required. Polarity is marked by cathode band; operation requires banded end positive relative to anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.8 V ±5% at 175 mA - defines stable regulation point under nominal bias |
| Power Dissipation | 5.0 W at TL = 25°C, 3/8″ lead length - sets maximum continuous thermal load with proper heatsinking |
| Dynamic Impedance (ZZ) | 1.0 Ω max at IZT - ensures minimal output voltage variation under changing load current |
| Max Reverse Current (IR) | 10 μA at VR = 5.2 V - confirms low leakage below knee voltage, critical for standby power integrity |
| Thermal Resistance | 25 °C/W junction-to-lead - enables predictable temperature rise with known lead-mount thermal path |
| Surge Current (IZSM) | 11.5 A (8.3 ms half-sine) - supports transient overvoltage clamping without failure |
| Operating Temperature | –65°C to +150°C - validated for industrial and automotive under-hood environments |
Pinout & Package
Package: Axial-leaded T-18 plastic encapsulated case per JEDEC DO-201AD; void-free UL94V-0 epoxy body; cathode indicated by colored band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node; reverse-biased during regulation |
| Cathode | Zener breakdown terminal / regulation output | Banded end; connected to higher-potential node; delivers stable 6.8 V reference |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with industry-standard DO-201AD mechanical and electrical definitions |
| ±5% voltage tolerance (B suffix) | Reduces calibration overhead in fixed-voltage reference designs |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and bake-out prior to assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables handling without special static control in standard production lines |
| High IZM (700 mA) with low thermal resistance | Supports robust regulation in high-current shunt applications with minimal heatsink area |
Applications
| DC Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing unregulated 12 V rail in industrial PLC power module. IC Role / Device Role / Timing Role: Shunt voltage regulator maintaining 6.8 V reference for feedback loop comparator. Use Value: Delivers stable regulation with <0.15 V ΔVZ across 70–350 mA load current swing. | Use Scenario: Clamping transient spikes on 5 V microcontroller I/O line. IC Role / Device Role / Timing Role: Bidirectional transient suppressor (with series resistor) limiting voltage to 6.8 V. Use Value: Withstands 11.5 A surge (8.3 ms) without degradation, preserving downstream logic integrity. |
| Programmable Reference Source | Temperature-Stable Bias Generator |
Use Scenario: Setting threshold in analog window comparator for battery charge termination. IC Role / Device Role / Timing Role: Precision voltage reference for op-amp input stage. Use Value: ±5% tolerance and low ZZ ensure repeatable trip points across –40°C to +85°C ambient. | Use Scenario: Generating stable bias current for RF amplifier transistor. IC Role / Device Role / Timing Role: Zener-based current source with thermal compensation network. Use Value: Low 25 °C/W junction-to-lead thermal resistance minimizes drift due to self-heating at 200 mA bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5342B | Same Zener voltage (6.8 V), same ±5% tolerance, identical electrical specs - differs only in packaging (bulk vs. tape-and-reel) | No functional difference; TR8 denotes 8 mm tape-and-reel; B suffix already included in 1N5342/TR8 per datasheet | Select 1N5342/TR8 for automated SMT placement; select 1N5342B for manual or bulk-handling assembly |
| MMBZ5235B-TP | Surface-mount SOD-123 package; 6.8 V ±5%; lower power (500 mW); higher ZZ (10 Ω); different thermal profile | Not suitable for 5 W dissipation; limited to low-power bias/reference where board space is constrained | Choose MMBZ5235B-TP only when footprint reduction outweighs power and thermal requirements |
Compared with 1N5342/TR8, the 1N5342B offers identical regulation performance but lacks tape-and-reel packaging for pick-and-place, while MMBZ5235B-TP trades 90% lower power rating and higher impedance for miniaturization-neither is a drop-in replacement without thermal and layout revalidation.
Availability
1N5342/TR8 is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection circuits, and programmable reference sources requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for 1N5342/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was designed as a JEDEC-registered family of 5 W axial Zeners to deliver stable voltage regulation across harsh environments, with emphasis on thermal robustness, ESD immunity, and military-grade screening options.
FAQ
What is the Zener voltage tolerance for 1N5342/TR8?
The 1N5342/TR8 has a Zener voltage tolerance of ±5%, indicated by the "B" suffix in its full designation. This means its regulated voltage falls within 6.46 V to 7.14 V at 175 mA test current and 25°C lead temperature, as confirmed in the Microsemi datasheet Table "ELECTRICAL CHARACTERISTICS @ 25°C".
Can 1N5342/TR8 be used without a heatsink?
1N5342/TR8 can operate without an external heatsink only at significantly derated power levels. At ambient temperature (TA = 25°C) on FR4 board with 4 mm² copper pads, its steady-state power drops to 1.47 W. Full 5.0 W operation requires mounting with 3/8″ (10 mm) lead length and thermal resistance of 25 °C/W junction-to-lead - implying adequate PCB copper or chassis conduction, not zero heatsinking.
Is 1N5342/TR8 RoHS compliant?
Yes, 1N5342/TR8 is RoHS compliant. The "e3" marking in the Microsemi documentation confirms matte-tin plating per JEDEC standards, and the part uses lead-free terminations compliant with Directive 2011/65/EU. No exemption codes apply, and no dry pack is required due to Level 1 moisture sensitivity.
What does the "TR8" suffix mean in 1N5342/TR8?
The "TR8" suffix indicates tape-and-reel packaging per EIA-296 standard, with 8 mm carrier tape width. This format supports automated surface-mount assembly equipment. The base device remains electrically and mechanically identical to 1N5342B; TR8 adds packaging logistics-not functional change-to the JEDEC-registered 5 W Zener.
How does 1N5342/TR8 perform under surge conditions?
1N5342/TR8 is rated for 11.5 A peak non-recurrent surge current (IZSM) in an 8.3 ms half-sine waveform, as specified in the Microsemi datasheet. This capability enables reliable transient clamping in power rails and interface lines, provided series impedance limits average power dissipation during the event and thermal mass prevents junction overheating.
1N5342/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):
- 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/TR8 FAQ
1.How can I place an order for 1N5342/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5342/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 1N5342/TR8 reliable?
The price and inventory of 1N5342/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5342/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5342/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5342/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5342/TR8?
1N5342/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5342/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 1N5342/TR8?
For technical support, including 1N5342/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5342/TR8 requirements.
6.How does Aetrix verify that 1N5342/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5342/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 1N5342/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5342/TR8?
All 1N5342/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5342/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 1N5342/TR8 part is unused and in its original packaging.
Return procedure for 1N5342/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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