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Microchip Technology 1N5342C/TR12
- Part No.:
- 1N5342C/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5342C/TR12.pdf
- Description:
- DIODE ZENER 6.8V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:9,251
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Product details
Overview
1N5342C/TR12 from Microsemi is a 5 W, 6.8 V ±2% tolerance axial-leaded silicon Zener diode designed for precision voltage regulation in power supply reference and overvoltage protection circuits. It delivers stable regulation at 175 mA test current (IZT), with 1.0 Ω maximum dynamic impedance (ZZ), 11.5 V maximum regulator current (IZM), and operates across –65 °C to +150 °C.
For engineers reviewing the 1N5342C/TR12 datasheet, 1N5342C/TR12 pinout, 1N5342C/TR12 application, or 1N5342C/TR12 equivalent, this page provides verified electrical parameters, thermal derating behavior, JEDEC T-18 package details, RoHS-compliant plating, and validated alternative options for industrial power management designs.
Technical Context
This Zener operates in reverse breakdown mode with cathode-banded polarity, requiring the banded end to be held positive relative to the anode. Its low 1.0 Ω dynamic impedance ensures minimal voltage variation under load changes up to 11.5 mA DC regulation current.
Thermal resistance is specified as 25 °C/W junction-to-lead (at 10 mm lead length) and 85 °C/W junction-to-ambient on FR4 PCB - enabling reliable 5 W dissipation only with appropriate heat sinking or board copper area per Figure 1 derating curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.8 V ±2% - precise reference voltage at 175 mA test current, suitable for ±136 mV stability in feedback loops. |
| Power Dissipation (Pd) | 5.0 W at TL = 25 °C - requires thermal management beyond 25 °C ambient or lead temperature per derating curve. |
| Dynamic Impedance (ZZ) | 1.0 Ω max - ensures <10 mV output shift per 10 mA load change near IZT, critical for low-noise references. |
| Max Regulator Current (IZM) | 11.5 mA - maximum continuous DC current before exceeding 5 W at upper-tolerance VZ (7.07 V). |
| Reverse Leakage (IR) | 10 μA max at VR = 5.2 V - confirms sharp knee and low quiescent loss in standby regulation. |
| Surge Current (IZSM) | 14.4 A peak (8.3 ms half-sine) - supports transient overvoltage clamping without failure. |
| Operating Temp Range | –65 °C to +150 °C - qualified for automotive under-hood and industrial control environments. |
Pinout & Package
Package: JEDEC T-18 axial-leaded plastic case (void-free UL94V-0 epoxy), 0.7 g weight, cathode indicated by color band. Leads are annealed matte-tin (RoHS compliant) per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to system ground or lower-potential rail; must remain negative relative to cathode during regulation. |
| Cathode (banded end) | Regulated output node | Provides stable 6.8 V when reverse-biased; supplies reference current to error amplifier or shunt controller. |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener tolerance (C suffix) | Enables tighter output voltage accuracy than standard ±5% (B) or ±10% (A) variants, reducing calibration overhead. |
| Moisture sensitivity Level 1 | No dry pack required - simplifies SMT reflow prep and eliminates bake step for tape-and-reel (TR12) delivery. |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for handling precautions in assembly lines, lowering manufacturing risk. |
| Tape-and-reel packaging (TR12) | 12,000 pcs/reel per EIA-296 - optimized for high-volume automated placement in power supply production. |
| High surge current rating | 14.4 A peak withstand capability allows use in input-stage transient suppression without external crowbar devices. |
Applications
| Switching Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback or forward converter feedback loop via optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Precision voltage reference providing 6.8 V threshold to TL431-like shunt regulator or discrete op-amp comparator. Use Value: ±2% tolerance ensures ≤±136 mV reference drift, directly improving output regulation to ±1.5% over line/load/temperature. |
Use Scenario: Clamping 12 V rail against transients from relay switching or motor commutation in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Shunt protector diverting excess energy to ground when rail exceeds 6.8 V + margin. Use Value: 14.4 A surge rating absorbs 8.3 ms transients without degradation, extending system MTBF vs. standard 1 W Zeners. |
| DC-DC Converter Reference | Temperature-Stable Bias Network |
Use Scenario: Generating fixed bias voltage for gate drivers or analog front-end circuitry in 5–12 V intermediate bus converters. IC Role / Device Role / Timing Role: Low-impedance voltage source replacing resistive divider where stability over –40 °C to +85 °C is required. Use Value: 1.0 Ω ZZ minimizes load-induced droop; 150 °C max operating temp enables use in sealed enclosures without derating. |
Use Scenario: Setting stable bias point for differential amplifiers or sensor signal conditioning in automotive engine control units. IC Role / Device Role / Timing Role: Temperature-compensated reference element in two-diode bias string configurations. Use Value: Tight ±2% tolerance and low ΔVZ (0.15 V) ensure <0.3% total bias drift over full industrial temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5342B/TR13 | ±5% tolerance (vs. ±2%), same VZ nominal, identical package and IZM. | Acceptable where reference accuracy <±340 mV is sufficient; lower cost. | Select when budget constraints outweigh need for tight regulation in non-critical rails. |
| MMSZ5234ET1G | Surface-mount SOD-123 package, 500 mW rating, ±5% tolerance, 6.8 V nominal. | Limited to low-power logic-level clamping; cannot replace 1N5342C/TR12 in 5 W applications. | Choose only for space-constrained PCBs where power dissipation ≤0.5 W is confirmed. |
Compared with 1N5342B/TR13 and MMSZ5234ET1G, the 1N5342C/TR12 uniquely combines ±2% accuracy, 5 W power handling, and axial-leaded T-18 packaging - making it irreplaceable in high-reliability, medium-power analog reference and clamp roles where both precision and robustness are mandatory.
Availability
1N5342C/TR12 is available at Aetrix Electronics and suitable for switching power supply feedback, overvoltage protection clamp, and DC-DC converter reference applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N5342C/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, RF, and power management components for aerospace, defense, and industrial markets.
The 1N53xx series was engineered for ruggedized voltage regulation in harsh-environment power systems - emphasizing wide temperature operation, surge resilience, and JEDEC-standardized axial packaging for through-hole reliability.
FAQ
What is the Zener voltage tolerance of the 1N5342C/TR12?
The 1N5342C/TR12 has a ±2% Zener voltage tolerance, meaning its regulated voltage falls between 6.664 V and 6.936 V at 175 mA test current and 25 °C lead temperature. This tighter tolerance is designated by the "C" suffix and distinguishes it from ±5% (B suffix) or ±10% (A suffix) variants in the same family.
Can the 1N5342C/TR12 be used in surface-mount designs?
No - the 1N5342C/TR12 uses a JEDEC T-18 axial-leaded package and is not compatible with SMT assembly. For surface-mount equivalents, Microsemi offers the SMBJ5342B series; however, those parts differ in power rating, thermal path, and footprint, and are not drop-in replacements for the 1N5342C/TR12.
What is the maximum steady-state power dissipation for the 1N5342C/TR12 on a standard PCB?
When mounted on a 1 oz copper FR4 PCB with 4 mm² pads and 1 mm × 25 mm trace, the 1N5342C/TR12 is rated for 1.47 W steady-state power at 25 °C ambient - significantly less than its 5 W rating at 25 °C lead temperature. Derating is required above 25 °C per Figure 1 in the official datasheet.
Does the 1N5342C/TR12 require moisture preconditioning before reflow?
No - the 1N5342C/TR12 has IPC/JEDEC J-STD-020B moisture sensitivity Level 1, meaning it is not hygroscopic and does not require dry packing or baking prior to soldering, even in tape-and-reel (TR12) format.
How is polarity marked on the 1N5342C/TR12?
The 1N5342C/TR12 uses a cathode band (typically black or dark stripe) on the body to identify the cathode terminal. During operation, the banded end must be held positive relative to the unbanded (anode) end to achieve reverse-bias Zener conduction and voltage regulation.
1N5342C/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:
- ±2%
- 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
1N5342C/TR12 FAQ
1.How can I place an order for 1N5342C/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5342C/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 1N5342C/TR12 reliable?
The price and inventory of 1N5342C/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5342C/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5342C/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5342C/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5342C/TR12?
1N5342C/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5342C/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 1N5342C/TR12?
For technical support, including 1N5342C/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5342C/TR12 requirements.
6.How does Aetrix verify that 1N5342C/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5342C/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 1N5342C/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5342C/TR12?
All 1N5342C/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5342C/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 1N5342C/TR12 part is unused and in its original packaging.
Return procedure for 1N5342C/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5342C/TR12 Tags
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