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Microchip Technology 1N5342E3/TR12
- Part No.:
- 1N5342E3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5342E3/TR12.pdf
- Description:
- DIODE ZENER 6.8V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,223
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Product details
Overview
1N5342E3/TR12 from Microsemi is a 5.1 V, ±5% tolerance, 5 W axial-leaded silicon Zener diode optimized for voltage regulation in power supply feedback loops, overvoltage protection circuits, and precision reference applications. It delivers 240 mA maximum Zener test current (IZT), 1.5 Ω dynamic impedance (ZZ), and 930 mA maximum Zener current (IZM) with adequate heat sinking.
For engineers reviewing the 1N5342E3/TR12 datasheet, 1N5342E3/TR12 pinout, 1N5342E3/TR12 application, or 1N5342E3/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (14.4 A), low knee impedance (0.39 Ω at 1 mA), and RoHS-compliant matte-tin plating.
Technical Context
This device operates as a two-terminal voltage reference with cathode-banded polarity, requiring reverse-bias connection where the banded end is positive relative to the anode. Its regulation performance is specified at 25 °C lead temperature (TL), with voltage measured 40 ±10 ms after DC current application.
The 1N5342E3/TR12 exhibits 1.5 Ω dynamic impedance at 240 mA IZT and 0.39 Ω knee impedance at 1 mA IZK, enabling stable regulation across wide current ranges. Thermal derating follows a linear curve: full 5 W dissipation at TL ≤ 25 °C, reduced to 1.47 W at TA = 25 °C on FR4 with defined copper pad geometry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V ±5% - precise regulation setpoint for feedback and clamping circuits |
| Test Current (IZT) | 240 mA - operating point where VZ and ZZ are guaranteed per JEDEC spec |
| Dynamic Impedance (ZZ) | 1.5 Ω - low AC resistance ensures minimal voltage shift under load transients |
| Max Zener Current (IZM) | 930 mA - peak continuous DC current achievable with 3/8″ lead length heat sinking |
| Surge Current (IZSM) | 14.4 A - non-repetitive 8.3 ms half-sine capability for transient overvoltage suppression |
| Voltage Regulation (ΔVZ) | 0.39 V - difference between VZ at 10% and 50% of IZM, quantifying regulation linearity |
| Forward Voltage (VF) | 1.2 V max @ 1.0 A - defines conduction loss during forward-biased fault conditions |
Pinout & Package
Package: Axial-leaded T-18 plastic case (Void-free UL94V-0 epoxy), 0.7 g weight, moisture sensitivity Level 1 (no dry pack required). Cathode identified by black band; device operated with banded end positive.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Current entry terminal in forward bias; reference ground node in reverse-bias regulation | Connected to system ground or low-side return path; establishes reference potential for VZ |
| Cathode (banded end) | Current exit terminal in forward bias; regulated output node in reverse bias | Connected to feedback node or protected rail; supplies stable 5.1 V reference under varying load |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 5 W Zener | Guaranteed compliance with industry-standard mechanical and electrical test protocols |
| RoHS-compliant matte-tin plating | Lead-free solderability per MIL-STD-750 Method 2026, compatible with Pb-free reflow |
| Low thermal resistance (25 °C/W) | Enables high-power operation with simple lead-length heat sinking-no PCB copper pour required |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for handling precautions beyond standard static-safe practices |
| Stable regulation over -65 °C to +150 °C | Validated operation across extended industrial and automotive ambient ranges without derating |
Applications
| Switching Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converter feedback loop using optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Precision 5.1 V reference source for TL431-type shunt regulator or discrete op-amp comparator. Use Value: Tight ±5% VZ tolerance and low ΔVZ ensure <±1% output voltage stability across line/load/temperature. |
Use Scenario: Clamping 12 V rail against surge events (e.g., load dump, inductive kick) in automotive body control modules. IC Role / Device Role / Timing Role: Two-terminal shunt protector placed between rail and ground, conducting only above 5.1 V threshold. Use Value: 14.4 A IZSM rating absorbs 8.3 ms transients without degradation; 1.5 Ω ZZ limits clamping overshoot. |
| Programmable Voltage Reference | Industrial Sensor Excitation |
Use Scenario: Providing stable excitation voltage for resistive bridge sensors (e.g., strain gauges, RTDs) in data acquisition front-ends. IC Role / Device Role / Timing Role: Low-noise, low-drift DC reference replacing higher-cost IC references where 5.1 V suffices. Use Value: 0.39 Ω ZZK at 1 mA enables sub-mV regulation error even at microamp-level sensor bias currents. |
Use Scenario: Biasing 4–20 mA transmitter loop components requiring stable headroom voltage in process automation transmitters. IC Role / Device Role / Timing Role: Zener-based local reference for current-loop DACs or op-amp bias networks. Use Value: Operation up to +150 °C allows placement near hot industrial sensors; no external capacitors needed for stability. |
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 | Same VZ (5.1 V), ±5%, but non-RoHS tin-lead plating; identical electrical specs and package | Not suitable for Pb-free manufacturing; otherwise drop-in replacement in legacy assemblies | Select 1N5342B only if RoHS exemption applies and tin-lead soldering is used. |
| SMBJ5342B | Surface-mount SMB package; same VZ and tolerance, but lower IZM (500 mA) and higher thermal resistance (junction-to-ambient) | Requires PCB layout change; suited for space-constrained designs where axial leads are impractical | Choose SMBJ5342B when board area is critical and thermal management via copper pour is feasible. |
Compared with 1N5342B and SMBJ5342B, the 1N5342E3/TR12 uniquely combines RoHS compliance, axial-leaded serviceability, and highest IZM (930 mA) among 5.1 V variants-making it optimal for through-hole power regulation where reliability and repairability matter.
Availability
1N5342E3/TR12 is available at Aetrix Electronics and suitable for switching power supplies, overvoltage protection circuits, and programmable voltage references requiring stable component supply across industrial, automotive, and instrumentation programs.
Supply support for 1N5342E3/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 timing solutions for aerospace, defense, and industrial markets.
The 1N53xx series was designed as a JEDEC-standardized, high-power Zener platform delivering robust voltage regulation across extreme temperatures and surge conditions-targeting mission-critical power integrity applications.
FAQ
What is the Zener voltage tolerance for 1N5342E3/TR12?
The 1N5342E3/TR12 has a nominal Zener voltage of 5.1 V with a tolerance of ±5%, as indicated by the "B" suffix in its base family designation (1N5342B) and confirmed in the Electrical Characteristics table. The "E3" suffix denotes RoHS compliance but does not alter voltage tolerance.
How much power can 1N5342E3/TR12 dissipate continuously?
The 1N5342E3/TR12 is rated for 5.0 W steady-state power dissipation at a lead temperature (TL) of 25 °C with 3/8″ (10 mm) lead length from the body. Derating is linear: power drops to 1.47 W at 25 °C ambient when mounted on FR4 with specified copper pads and traces.
What is the maximum surge current rating for 1N5342E3/TR12?
The 1N5342E3/TR12 has a maximum non-repetitive surge current (IZSM) of 14.4 A, defined as the peak of an 8.3 ms half-sine wave. This rating enables reliable transient suppression in automotive and industrial environments without device failure.
Is 1N5342E3/TR12 suitable for surface-mount assembly?
No-1N5342E3/TR12 uses an axial-leaded T-18 package and is intended for through-hole mounting. For surface-mount equivalents, Microsemi offers the SMBJ5342B in SMB package, which shares the same 5.1 V rating but differs in thermal and current ratings.
What does the "TR12" suffix mean in 1N5342E3/TR12?
The "TR12" suffix indicates tape-and-reel packaging per EIA-296 standard, with 12,000 units per reel. This format supports automated pick-and-place assembly and is distinct from bulk or ammo-pack options-ensuring consistent feeding in high-volume production lines.
1N5342E3/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
1N5342E3/TR12 FAQ
1.How can I place an order for 1N5342E3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5342E3/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 1N5342E3/TR12 reliable?
The price and inventory of 1N5342E3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5342E3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5342E3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5342E3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5342E3/TR12?
1N5342E3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5342E3/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 1N5342E3/TR12?
For technical support, including 1N5342E3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5342E3/TR12 requirements.
6.How does Aetrix verify that 1N5342E3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5342E3/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 1N5342E3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5342E3/TR12?
All 1N5342E3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5342E3/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 1N5342E3/TR12 part is unused and in its original packaging.
Return procedure for 1N5342E3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5342E3/TR12 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ5245BS-7-F
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MM5Z5V1ST1G
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