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Microchip Technology 1N5349E3/TR8
- Part No.:
- 1N5349E3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5349E3/TR8.pdf
- Description:
- DIODE ZENER 12V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,458
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Product details
Overview
1N5349E3/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 12 V, ±5% tolerance (B-suffix equivalent), 100 mA maximum regulator current (IZM), 2.5 Ω maximum dynamic impedance (ZZ) at 100 mA test current, and operates from –65 °C to +150 °C. It delivers stable voltage reference in power supply feedback loops, overvoltage protection circuits, and precision biasing networks.
For engineers reviewing the 1N5349E3/TR8 datasheet, 1N5349E3/TR8 pinout, 1N5349E3/TR8 application, or 1N5349E3/TR8 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (18.7 A), voltage regulation (ΔVZ = 0.25 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage reference operating in reverse breakdown mode. Its regulation performance is defined at 100 mA test current (IZT), with low dynamic impedance (2.5 Ω) ensuring minimal voltage shift across load variations, and tight voltage regulation (ΔVZ = 0.25 V between 10% and 50% IZM) supporting stable reference behavior under dynamic conditions.
Thermal design relies on lead-mounted conduction: junction-to-lead thermal resistance is 25 °C/W at 10 mm lead length, enabling 5 W dissipation at TL ≤ 25 °C; when mounted on FR4 with 4 mm² copper pads, steady-state power drops to 1.47 W at TA = 25 °C due to higher 85 °C/W junction-to-ambient resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V nominal, ±5% tolerance - defines precise clamping threshold for regulation or protection |
| Test Current (IZT) | 100 mA - operating point where VZ and ZZ are specified; sets minimum bias for stable regulation |
| Dynamic Impedance (ZZ) | 2.5 Ω max at IZT - low impedance ensures <0.25 V output variation across 10–50% IZM range |
| Max Regulator Current (IZM) | 750 mA - maximum continuous reverse current before thermal runaway at TL = 25 °C |
| Surge Current (IZSM) | 18.7 A peak (8.3 ms half-sine) - supports transient overvoltage suppression without failure |
| Reverse Leakage (IR) | 2.0 µA max at VR = 9.1 V - ensures negligible standby current in high-impedance bias networks |
| Forward Voltage (VF) | 1.2 V max at IF = 1.0 A - defines forward conduction loss during polarity-reversal fault conditions |
Pinout & Package
Package: Axial-leaded T-18 plastic case (Void-free UL94V-0 epoxy), cathode indicated by band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026; weight 0.7 g; moisture sensitivity level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; reverse-biased operation requires cathode at higher potential |
| Cathode | Regulated output node | Banded end; supplies stable 12 V reference when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Ensures standardized mechanical dimensions, marking, and electrical test methodology across suppliers |
| RoHS-compliant e3 suffix | Meets EU Directive 2011/65/EU with matte-tin plating-no lead, cadmium, or hexavalent chromium |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and floor-life constraints-safe for standard SMT assembly handling |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Withstands human-body-model discharges up to ±2 kV without parameter shift or failure |
| High surge current capability | 18.7 A non-recurrent half-sine (8.3 ms) enables robust transient voltage suppression in industrial inputs |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference sets error amplifier threshold; provides stable 12 V reference independent of input line variation. Use Value: Low ΔVZ (0.25 V) and 2.5 Ω ZZ maintain <1% output regulation across 10–100% load steps. | Use Scenario: Placed across DC bus rails in motor drives to clamp transients exceeding 12 V. IC Role / Device Role / Timing Role: Acts as passive crowbar; conducts only during overvoltage events above 12.6 V (12 V × 1.05). Use Value: 18.7 A surge rating absorbs 100 mJ single-event transients without degradation. |
| Precision Bias Network | Industrial Sensor Excitation |
Use Scenario: Supplies regulated 12 V bias to op-amp input stages in analog signal conditioning modules. IC Role / Device Role / Timing Role: Provides low-noise, temperature-stable reference for high-gain amplifiers. Use Value: ±5% tolerance and –65 °C to +150 °C operation ensure drift <±15 mV over full industrial temperature range. | Use Scenario: Excites resistive temperature detectors (RTDs) in process control transmitters. IC Role / Device Role / Timing Role: Delivers constant-voltage excitation source with minimal self-heating effect. Use Value: 25 °C/W junction-to-lead thermal resistance allows mounting directly to heatsink for stable 12 V output at 100 mA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5349B | Same 12 V, ±5%, 5 W rating but with SnPb plating and no e3 RoHS designation | Not suitable for RoHS-compliant production; otherwise identical regulation performance and thermal specs | Select 1N5349B only for legacy repair or non-RoHS environments where leaded solder is used |
| SMBJ5349B | Surface-mount SMB package (JEDEC DO-214AA); same electrical specs but 85 °C/W junction-to-ambient vs. 25 °C/W junction-to-lead | Requires PCB copper area for thermal management; unsuitable for lead-mounted heat sinking | Choose SMBJ5349B for space-constrained designs where board-level thermal design replaces lead conduction |
Compared with 1N5349B and SMBJ5349B, the 1N5349E3/TR8 uniquely combines RoHS compliance, axial-leaded thermal efficiency (25 °C/W), and tape-and-reel packaging (TR8) for automated through-hole assembly-making it optimal for high-reliability industrial power supplies requiring both regulatory compliance and thermal headroom.
Availability
1N5349E3/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and precision bias networks requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.
Supply support for 1N5349E3/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 specifically for ruggedized 5 W voltage regulation in harsh-environment power systems-emphasizing wide temperature operation, surge resilience, and JEDEC-standardized mechanical reliability.
FAQ
What is the Zener voltage tolerance of the 1N5349E3/TR8?
The 1N5349E3/TR8 has a nominal Zener voltage of 12 V with ±5% tolerance, consistent with the "B" suffix in the 1N53xxB family. This tolerance is confirmed in the Electrical Characteristics table on page 1 of the Microsemi datasheet, where 1N5349B (identical electrical spec) is listed with VZ = 12 V and IZT = 100 mA. The e3 suffix denotes RoHS compliance but does not alter voltage tolerance.
Does the 1N5349E3/TR8 require dry packing before use?
No, the 1N5349E3/TR8 does not require dry packing. Its moisture sensitivity level is Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored and handled indefinitely in ambient conditions without baking or humidity-controlled packaging-confirmed in the Features section of the Microsemi datasheet.
What is the maximum power dissipation of the 1N5349E3/TR8 at 25 °C ambient?
When mounted on an FR4 PCB with 4 mm² copper pads and 1 mm trace width (per datasheet thermal test condition), the 1N5349E3/TR8 delivers 1.47 W steady-state power at TA = 25 °C. At TL = 25 °C (3/8″ lead length from body), it achieves full 5.0 W-verified in the Maximum Ratings section under "Steady-State Power."
How is polarity marked on the 1N5349E3/TR8?
The 1N5349E3/TR8 uses a cathode band for polarity identification: the banded end is the cathode and must be held at a higher potential than the anode to operate in reverse breakdown. This marking convention is explicitly stated in the Mechanical and Packaging section and applies uniformly across the 1N53xxB series.
What does the "TR8" suffix indicate in 1N5349E3/TR8?
The "TR8" suffix indicates tape-and-reel packaging per EIA-296 standard, with 8 mm tape width and component orientation optimized for automated through-hole insertion equipment. This is documented in the Mechanical and Packaging section, which states "TAPE & REEL option: Standard per EIA-296 (add 'TR' suffix to part number)."
1N5349E3/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):
- 12 V
- Tolerance:
- ±20%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2.5 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 8.6 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
1N5349E3/TR8 FAQ
1.How can I place an order for 1N5349E3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5349E3/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 1N5349E3/TR8 reliable?
The price and inventory of 1N5349E3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5349E3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5349E3/TR8?
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1N5349E3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5349E3/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 1N5349E3/TR8?
For technical support, including 1N5349E3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5349E3/TR8 requirements.
6.How does Aetrix verify that 1N5349E3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5349E3/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 1N5349E3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5349E3/TR8?
All 1N5349E3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5349E3/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 1N5349E3/TR8 part is unused and in its original packaging.
Return procedure for 1N5349E3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5349E3/TR8 Tags
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