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Microchip Technology 1N5342B/TR8
- Part No.:
- 1N5342B/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5342B/TR8.pdf
- Description:
- DIODE ZENER 6.8V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:7,947
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Product details
Overview
1N5342B/TR8 from Microsemi is a 5.0 W axial-leaded silicon Zener diode with nominal regulation voltage of 6.8 V, ±5% tolerance (B suffix), 175 mA test current (IZT), 1.0 Ω maximum dynamic impedance (ZZ), and 700 mA maximum Zener current (IZM) when adequately heat-sunk. It regulates voltage in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N5342B/TR8 datasheet, 1N5342B/TR8 pinout, 1N5342B/TR8 application, or 1N5342B/TR8 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (11.5 A), low voltage regulation (ΔVZ = 0.15 V), and RoHS-compliant e3 packaging with tape-and-reel (TR8) delivery.
Technical Context
This device operates as a voltage reference by maintaining stable reverse-biased conduction at its specified Zener voltage (6.8 V) across a wide current range (10% to 50% of IZM). Its low dynamic impedance (1.0 Ω) ensures minimal voltage variation under load changes, while its 25 °C/W junction-to-lead thermal resistance enables reliable 5.0 W dissipation with 3/8″ lead length heat sinking.
The 1N5342B/TR8 features cathode band polarity marking, moisture sensitivity level 1 per J-STD-020B (no dry pack required), and compliance with MIL-PRF-19500 screening options when prefixed with MQ/MX/MV. It withstands 8.3 ms half-sine surge currents up to 11.5 A and exhibits <0.15 V voltage regulation between 10% and 50% of IZM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.8 V ±5% - precise DC reference for feedback loops and voltage clamping |
| Test Current (IZT) | 175 mA - operating point where VZ and ZZ are specified; defines stable regulation zone |
| Dynamic Impedance (ZZ) | 1.0 Ω max - low AC resistance ensures minimal output voltage ripple under varying load |
| Max Zener Current (IZM) | 700 mA - peak continuous reverse current sustainable at TL = 25°C with proper heatsinking |
| Power Dissipation | 5.0 W at TL = 25°C - requires 3/8″ (10 mm) lead length from body for full rating |
| Voltage Regulation (ΔVZ) | 0.15 V - difference between VZ measured at 10% and 50% of IZM; indicates regulation linearity |
| Surge Current (IZSM) | 11.5 A - non-repetitive 8.3 ms half-sine pulse handling capability for transient suppression |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free thermosetting epoxy, UL94V-0 rated), cathode indicated by colored band; leads plated with annealed matte tin (RoHS-compliant e3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit common or lower potential; reverse-biased operation requires cathode at higher potential |
| Cathode | Zener regulation output / voltage clamp node | Banded end; connected to regulated rail or protection point; must be held positive relative to anode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N53xxB series | Industry-standard footprint and electrical behavior enabling direct replacement in legacy designs |
| ±5% Zener voltage tolerance (B suffix) | Guarantees 6.46–7.14 V regulation window at 175 mA, suitable for mid-precision references |
| Low thermal resistance (25 °C/W) | Enables full 5.0 W power dissipation with simple lead-length heatsinking-no PCB copper pour required |
| Moisture sensitivity Level 1 | No dry-pack or baking needed before assembly; compatible with standard SMT/reflow processes |
| RoHS-compliant e3 marking | Meets EU Directive 2011/65/EU; tin-lead alternative available without e3 suffix |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Precision voltage reference for TL431-like error amplifier input or direct shunt regulator. Use Value: 6.8 V nominal Zener voltage matches common TL431 reference thresholds; ±5% tolerance ensures stable regulation across line/load transients. | Use Scenario: Clamping induced surges on 5–12 V DC rails in motor drive control boards. IC Role / Device Role / Timing Role: Passive overvoltage limiter protecting microcontroller I/O and analog front-end inputs. Use Value: 11.5 A surge rating absorbs 8.3 ms transients; 0.15 V ΔVZ ensures predictable clamping threshold under fast-rising events. |
| Industrial Sensor Excitation Reference | Programmable Logic Controller (PLC) Input Conditioning |
Use Scenario: Providing stable excitation voltage to resistive bridge sensors (e.g., strain gauges) in harsh environments. IC Role / Device Role / Timing Role: Low-drift DC reference source replacing more expensive precision voltage references. Use Value: 1.0 Ω dynamic impedance minimizes sensor output error due to supply current variation; -65°C to +150°C operating range supports extended industrial use. | Use Scenario: Level-shifting and voltage limiting for 24 V digital inputs in modular PLC backplanes. IC Role / Device Role / Timing Role: Input protection element that clips transients while maintaining logic-level compatibility. Use Value: Axial T-18 package allows through-hole mounting on high-vibration panels; 700 mA IZM supports sustained fault conditions without failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5342B (non-TR8) | Identical electrical specs and package; differs only in packaging-bulk vs. tape-and-reel | No functional difference; TR8 enables automated pick-and-place; bulk suits manual prototyping or low-volume repair | Select 1N5342B/TR8 for SMT production; choose bulk 1N5342B for bench testing or field replacement |
| MMBZ5235B (SOT-23) | Same 6.8 V ±5%, but 0.35 W rating, 100 mA IZM, surface-mount package | Limited to low-power signal-level regulation; unsuitable for >0.5 W dissipation or surge suppression | Use MMBZ5235B only in space-constrained, low-current applications; retain 1N5342B/TR8 for 5 W power handling |
Compared with 1N5342B (bulk) and MMBZ5235B (SOT-23), the 1N5342B/TR8 delivers full 5 W regulation in a robust axial package with tape-and-reel automation support-making it optimal for industrial power supply and protection designs requiring reliability and manufacturability.
Availability
1N5342B/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and industrial sensor reference systems requiring stable component supply across long product lifecycles.
Supply support for 1N5342B/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 as a JEDEC-standardized, high-power Zener family delivering stable voltage regulation from 3.3 V to 200 V with industry-leading surge resilience and thermal performance for mission-critical power systems.
FAQ
What is the Zener voltage tolerance of the 1N5342B/TR8?
The 1N5342B/TR8 has a ±5% Zener voltage tolerance, confirmed by the "B" suffix per Microsemi documentation. This means its regulated voltage falls within 6.46 V to 7.14 V at 175 mA test current and 25°C lead temperature. The tolerance applies across the full operating temperature range (-65°C to +150°C), with voltage drift characterized in the manufacturer's thermal coefficient data.
Can the 1N5342B/TR8 be used without a heatsink?
The 1N5342B/TR8 can dissipate up to 1.47 W at 25°C ambient when mounted on a standard FR4 PCB with 4 mm² copper pads, per its thermal resistance specification (85°C/W junction-to-ambient). For full 5.0 W operation, a 3/8″ (10 mm) lead length from the body is required to achieve 25°C/W junction-to-lead resistance-effectively using the lead as a heatsink. No external heatsink is mandatory if these mechanical conditions are met.
What does the "TR8" suffix mean in 1N5342B/TR8?
The "TR8" suffix in 1N5342B/TR8 indicates tape-and-reel packaging per EIA-296 standard, with 8 mm tape width and component orientation optimized for automated pick-and-place equipment. This differs from the bulk version (1N5342B) and ensures consistent feeding, reduced handling damage, and traceability in high-volume manufacturing-critical for repeatable SMT assembly of the 1N5342B/TR8.
Is the 1N5342B/TR8 RoHS compliant?
Yes, the 1N5342B/TR8 is RoHS compliant, as indicated by the "e3" designation in Microsemi's official documentation and part marking. Its leads feature annealed matte-tin plating meeting RoHS Directive 2011/65/EU requirements, with no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE substances above threshold limits. Compliance is verified per JEDEC J-STD-609A standard.
How does the 1N5342B/TR8 handle surge events?
The 1N5342B/TR8 is rated for a maximum non-repetitive surge current (IZSM) of 11.5 A, defined as a single 8.3 ms half-sine waveform. This capability enables robust transient voltage suppression in industrial power rails. Its ability to absorb such surges without degradation relies on its 5.0 W power rating, low thermal resistance, and rugged T-18 epoxy package-key design attributes validated in Microsemi's surge testing per MIL-STD-750 Method 3013.
1N5342B/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:
- ±5%
- 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
1N5342B/TR8 FAQ
1.How can I place an order for 1N5342B/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5342B/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 1N5342B/TR8 reliable?
The price and inventory of 1N5342B/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5342B/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5342B/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5342B/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5342B/TR8?
1N5342B/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5342B/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 1N5342B/TR8?
For technical support, including 1N5342B/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5342B/TR8 requirements.
6.How does Aetrix verify that 1N5342B/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5342B/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 1N5342B/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5342B/TR8?
All 1N5342B/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5342B/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 1N5342B/TR8 part is unused and in its original packaging.
Return procedure for 1N5342B/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5342B/TR8 Tags
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MM5Z5V1ST1G
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