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Microchip Technology 1N5342B/TR12
- Part No.:
- 1N5342B/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5342B/TR12.pdf
- Description:
- DIODE ZENER 6.8V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,562
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Product details
Overview
1N5342B/TR12 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/TR12 datasheet, 1N5342B/TR12 pinout, 1N5342B/TR12 application, or 1N5342B/TR12 equivalent, key selection criteria include its 6.8 V Zener voltage, 5 W steady-state power rating at TL < 25°C, ±5% tolerance, low 1.0 Ω dynamic impedance at IZT, and axial T-18 package compatibility with through-hole PCB assembly.
Technical Context
This device operates as a voltage reference by maintaining a stable reverse-biased breakdown voltage across its cathode–anode terminals. Its regulation performance is defined at 175 mA test current, with voltage regulation (ΔVZ) of 0.15 V between 10% and 50% of IZM, and thermal resistance of 25 °C/W junction-to-lead at 10 mm lead length.
The 1N5342B/TR12 exhibits minimal voltage drift versus current due to tight dynamic impedance control and supports surge currents up to 11.5 A (8.3 ms half-sine). Its moisture sensitivity level is IPC/JEDEC Level 1, eliminating dry-pack requirements for standard handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.8 V ±5% - precise reference voltage at 175 mA, enabling stable feedback in linear regulators. |
| Power Dissipation | 5.0 W at TL < 25°C - supports high-current regulation when mounted with 10 mm lead length from body. |
| Dynamic Impedance (ZZ) | 1.0 Ω max @ IZT - ensures minimal output voltage variation under load transients. |
| Max Zener Current (IZM) | 700 mA - defines safe continuous reverse conduction limit with proper heat sinking. |
| Voltage Regulation (ΔVZ) | 0.15 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity. |
| Surge Current (IZSM) | 11.5 A (8.3 ms half-sine) - withstands short-duration overvoltage events without failure. |
| Thermal Resistance | 25 °C/W junction-to-lead - enables predictable thermal design with standard axial-lead mounting. |
Pinout & Package
Package: Axial-leaded T-18 plastic encapsulated case per JEDEC TO-204AA; void-free thermosetting epoxy body (UL94V-0), matte-tin plated leads, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; reverse bias applied to cathode for regulation. |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; connected to unregulated input; maintains 6.8 V relative to anode during reverse conduction. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with industry-standard 1N53xxB series mechanical and electrical definitions for interchangeability. |
| ±5% voltage tolerance | Ensures consistent 6.8 V regulation across production lots without calibration. |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and bake-out prior to soldering, reducing manufacturing overhead. |
| Nonsensitive to ESD | Rated per MIL-STD-750 Method 1020 - no special ESD handling needed during assembly. |
| RoHS-compliant option | e3 suffix available - meets environmental compliance without performance trade-offs. |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in discrete linear regulator circuits for industrial instrumentation. IC Role / Device Role / Timing Role: Zener diode providing fixed 6.8 V reference to op-amp error amplifier input. Use Value: Maintains output regulation within ±1% over 10–100 mA load range due to 1.0 Ω ZZ and low ΔVZ. | Use Scenario: Clamping transient surges on 12 V DC bus lines in automotive control modules. IC Role / Device Role / Timing Role: Shunt protector diverting excess energy above 6.8 V to ground during load dump events. Use Value: Withstands 11.5 A surge (8.3 ms) without degradation, protecting downstream MOSFET drivers. |
| Signal Level Translation | Temperature-Stable Biasing |
Use Scenario: Generating a stable 6.8 V logic threshold for comparator inputs in sensor interface circuits. IC Role / Device Role / Timing Role: Voltage reference defining switching point for analog-to-digital signal conditioning. Use Value: Delivers <±0.5% drift over –65°C to +150°C operating range, ensuring consistent trip points. | Use Scenario: Setting bias current for RF amplifier stages requiring low-drift DC operating points. IC Role / Device Role / Timing Role: Precision shunt reference establishing stable quiescent current in transistor bias networks. Use Value: Achieves <0.02%/°C voltage drift coefficient via tight 5% tolerance and low ZZK (200 Ω @ 1 mA). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5342B (bulk) | Identical electrical specs; differs only in packaging - bulk vs. tape-and-reel (TR12) | No functional difference; TR12 enables automated pick-and-place assembly | Select 1N5342B/TR12 for SMT-compatible through-hole insertion; choose bulk for manual prototyping. |
| MMBZ5235B (SOT-23) | Same 6.8 V/±5%, but 0.5 W rating, 100 mA IZM, surface-mount package | Not suitable for 5 W power dissipation; limited to low-current references | Use MMBZ5235B only where space-constrained PCB layout and <100 mA regulation current apply. |
Compared with 1N5342B/TR12, the bulk version offers identical performance with manual handling flexibility, while MMBZ5235B trades power capability for miniaturization-making the 1N5342B/TR12 optimal for robust, high-current, through-hole voltage regulation where thermal mass and surge resilience matter.
Availability
1N5342B/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronics, test equipment, and embedded control systems requiring stable component supply and long-term obsolescence management.
Supply support for 1N5342B/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 radiation-hardened components for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized, high-power Zener regulation in harsh-environment applications where thermal stability, surge immunity, and long-term parametric consistency are critical.
FAQ
What is the Zener voltage tolerance of the 1N5342B/TR12?
The 1N5342B/TR12 has a nominal Zener voltage of 6.8 V with a tolerance of ±5%, as indicated by the "B" suffix per Microsemi's documentation. This tolerance is verified at 175 mA test current and 25°C lead temperature, ensuring predictable regulation performance across production units without calibration.
Can the 1N5342B/TR12 be used in surface-mount designs?
No-the 1N5342B/TR12 is an axial-leaded T-18 package intended for through-hole mounting. For surface-mount equivalents, Microsemi offers the SMBJ5342B or SMBG5342B in DO-214AA/DO-214AB packages. The 1N5342B/TR12 itself requires hole drilling and wave/soldering processes compatible with axial components.
What is the maximum surge current rating for the 1N5342B/TR12?
The 1N5342B/TR12 is rated for a maximum non-recurrent surge current (IZSM) of 11.5 A, defined as the peak of an 8.3 ms half-sine waveform. This rating assumes proper PCB layout with adequate copper area and thermal relief, and is validated per Microsemi's test methodology in the official datasheet.
Does the 1N5342B/TR12 require dry packing before reflow soldering?
No-the 1N5342B/TR12 has IPC/JEDEC moisture sensitivity level (MSL) 1, meaning it is not moisture-sensitive and does not require dry packing or baking prior to soldering. Its void-free epoxy encapsulation and Level 1 classification eliminate humidity-related popcorning risks during standard reflow or wave soldering.
How does the thermal resistance of the 1N5342B/TR12 affect its power handling?
The 1N5342B/TR12 has a junction-to-lead thermal resistance of 25 °C/W at 10 mm lead length. This means that with 5.0 W dissipation and ambient temperature at 25°C, the junction temperature rises ~125°C above ambient-well within its –65°C to +150°C operating range only if leads are kept cool via heatsinking or short thermal paths. Derating is required above 25°C lead temperature per Figure 1.
1N5342B/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:
- ±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/TR12 FAQ
1.How can I place an order for 1N5342B/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5342B/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 1N5342B/TR12 reliable?
The price and inventory of 1N5342B/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5342B/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5342B/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5342B/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5342B/TR12?
1N5342B/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5342B/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 1N5342B/TR12?
For technical support, including 1N5342B/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5342B/TR12 requirements.
6.How does Aetrix verify that 1N5342B/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5342B/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 1N5342B/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5342B/TR12?
All 1N5342B/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5342B/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 1N5342B/TR12 part is unused and in its original packaging.
Return procedure for 1N5342B/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5342B/TR12 Tags
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MM5Z5V1ST1G
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