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Microchip Technology 1N5349E3/TR13
- Part No.:
- 1N5349E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5349E3/TR13.pdf
- Description:
- DIODE ZENER 12V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,163
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Product details
Overview
1N5349E3/TR13 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), and 2.0 μA maximum reverse leakage at 9.1 V. It delivers stable voltage reference in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the 1N5349E3/TR13 datasheet, 1N5349E3/TR13 pinout, 1N5349E3/TR13 application, or 1N5349E3/TR13 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (18.7 A), low knee impedance (0.25 V regulation delta), and RoHS-compliant matte-tin plating.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown to clamp voltage across its terminals. Its regulation performance is defined at 100 mA test current (IZT), with dynamic impedance measured at 1 kHz AC superimposed on DC bias - not at DC-only conditions.
The 1N5349E3/TR13 is rated for steady-state dissipation of 5.0 W at 25 °C lead temperature (3/8" from body), derating linearly above 25 °C per Figure 1. Thermal resistance is 25 °C/W junction-to-lead and 85 °C/W junction-to-ambient on FR4 board - critical for heatsink design and PCB copper pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±5% - defines precise clamping threshold for feedback or protection circuits |
| Test Current (IZT) | 100 mA - operating point where VZ and ZZ are specified; sets minimum load for regulation |
| Dynamic Impedance (ZZ) | 2.5 Ω max - determines output voltage variation under changing load current |
| Max Regulator Current (IZM) | 750 mA - peak continuous reverse current before thermal failure at TL = 25 °C |
| Surge Current (IZSM) | 18.7 A - non-repetitive 8.3 ms half-sine pulse handling capability for transient suppression |
| Voltage Regulation (ΔVZ) | 0.25 V - difference between VZ at 10% and 50% of IZM; quantifies regulation linearity |
| Reverse Leakage (IR) | 2.0 μA max at VR = 9.1 V - ensures minimal standby power loss in high-impedance bias networks |
Pinout & Package
Package: T-18 axial-leaded plastic case (void-free UL94V-0 epoxy), cathode indicated by band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower-potential rail; establishes polarity for Zener operation |
| Cathode | Reverse breakdown terminal / Regulated output node | Banded end; connected to voltage to be regulated or clamped; carries full IZM current |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N53xx series | Industry-standard footprint and electrical behavior enabling direct sourcing and qualification reuse |
| Moisture sensitivity Level 1 | No dry pack required - simplifies handling, storage, and assembly logistics |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for special ESD handling during board assembly and testing |
| RoHS-compliant (e3 suffix) | Meets EU Directive 2011/65/EU; matte-tin plating replaces lead-based finishes |
| Tape-and-reel packaging (TR13 suffix) | Enables automated SMT placement compatibility despite axial-leaded form factor |
Applications
| Switching 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: Voltage reference element setting error amplifier trip point; directly interfaces with TL431 or similar shunt regulator. Use Value: 12 V ±5% tolerance and 0.25 V ΔVZ ensure tight output regulation (<±1.5%) across line/load/temperature. | Use Scenario: Placed across sensitive IC inputs (e.g., microcontroller GPIO) to limit transient overvoltage. IC Role / Device Role / Timing Role: Clamping diode absorbing energy from ESD or inductive kickback events. Use Value: 18.7 A surge rating and 2.5 Ω ZZ enable fast response and minimal overshoot during 8.3 ms transients. |
| Industrial Sensor Excitation | Reference Voltage Generator |
Use Scenario: Provides stable excitation voltage for resistive bridge sensors (e.g., strain gauges) in harsh environments. IC Role / Device Role / Timing Role: Precision voltage source maintaining constant current through sensor elements. Use Value: Low 2.5 Ω ZZ and 25 °C/W thermal resistance minimize drift due to self-heating and ambient shifts. | Use Scenario: Generates fixed 12 V reference for analog-to-digital converter (ADC) input scaling or comparator thresholds. IC Role / Device Role / Timing Role: Passive voltage reference replacing active ICs where ultra-low noise isn't required. Use Value: 2.0 μA IR at 9.1 V enables high-impedance bias networks without loading error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5349B | Same VZ (12 V), ±5% tolerance, but leaded bulk packaging (no TR13 tape/reel); no e3 RoHS marking | Not suitable for automated assembly; requires manual or vibratory bowl feeding | Select 1N5349B only for prototyping or low-volume hand-soldered builds |
| SMBJ5349B | Surface-mount SMB package; identical electrical specs except 100 °C/W junction-to-ambient thermal resistance | Requires PCB redesign; unsuitable for through-hole legacy designs or high-power dissipation without large copper areas | Choose SMBJ5349B only when space-constrained layouts and reflow assembly are mandatory |
Compared with 1N5349B and SMBJ5349B, the 1N5349E3/TR13 uniquely combines RoHS compliance, tape-and-reel automation readiness, and axial-leaded mechanical robustness - making it optimal for medium-to-high volume industrial power supply manufacturing where both regulatory compliance and assembly efficiency matter.
Availability
1N5349E3/TR13 is available at Aetrix Electronics and suitable for switching power supplies, overvoltage protection circuits, and industrial sensor excitation systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant procurement.
Supply support for 1N5349E3/TR13 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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N53xx series was designed specifically for ruggedized 5 W voltage regulation in harsh-environment power systems - emphasizing thermal stability, surge resilience, and JEDEC-standard interoperability.
FAQ
What is the Zener voltage tolerance of the 1N5349E3/TR13?
The 1N5349E3/TR13 has a nominal Zener voltage of 12 V with ±5% tolerance, confirmed by the "B"-equivalent specification in Microsemi's 1N5333B–1N5388B datasheet and consistent with the e3 RoHS-compliant variant of the same family. This tolerance means the actual VZ falls between 11.4 V and 12.6 V at 100 mA test current and 25 °C lead temperature. The 1N5349E3/TR13 maintains this tolerance across its qualified operating temperature range of –65 °C to +150 °C.
Does the 1N5349E3/TR13 require dry-pack moisture protection before soldering?
No, the 1N5349E3/TR13 does not require dry-pack moisture protection. It carries IPC/JEDEC J-STD-020B moisture sensitivity level (MSL) 1 classification, meaning it is exempt from baking or dry storage requirements prior to soldering. This is enabled by its void-free thermosetting epoxy encapsulation and verified per Microsemi's qualification data. The 1N5349E3/TR13 can be stored and assembled under standard factory conditions without humidity control.
What is the maximum surge current rating for the 1N5349E3/TR13?
The 1N5349E3/TR13 has a maximum non-repetitive surge current (IZSM) rating of 18.7 A, specified for an 8.3 ms half-sine waveform per Note 5 in the Microsemi datasheet. This value is derived from its 5 W power rating and 12 V Zener voltage, and reflects its ability to absorb transient energy without failure. Engineers must ensure external current-limiting impedance prevents repeated surges exceeding this rating, as the 1N5349E3/TR13 is not rated for repetitive surge duty.
How does the thermal resistance of the 1N5349E3/TR13 affect PCB layout?
The 1N5349E3/TR13 has a junction-to-lead thermal resistance of 25 °C/W when mounted with 3/8" (10 mm) lead length from the body - making lead length and copper pour area critical. For FR4 boards, its junction-to-ambient resistance rises to 85 °C/W with minimal copper (4 mm² pads, 1 mm track width). To maintain safe operation at full 5 W, PCB layout must use extended copper traces or thermal vias to reduce effective thermal resistance; otherwise, the 1N5349E3/TR13 will exceed its 150 °C max junction temperature.
Is the 1N5349E3/TR13 compatible with lead-free reflow soldering processes?
Yes, the 1N5349E3/TR13 supports lead-free reflow soldering with a maximum peak temperature of 260 °C for 10 seconds, as specified in the Mechanical and Packaging section of the Microsemi datasheet. Its RoHS-compliant matte-tin plating meets MIL-STD-750 Method 2026 solderability requirements. However, because it is an axial-leaded device, it is typically wave-soldered or hand-soldered - not reflowed - so process validation should confirm compatibility with the specific assembly method used for the 1N5349E3/TR13.
1N5349E3/TR13 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/TR13 FAQ
1.How can I place an order for 1N5349E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5349E3/TR13 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/TR13 reliable?
The price and inventory of 1N5349E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5349E3/TR13 is usually 5 days.
3.What payment methods are accepted for 1N5349E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5349E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5349E3/TR13?
1N5349E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5349E3/TR13 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/TR13?
For technical support, including 1N5349E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5349E3/TR13 requirements.
6.How does Aetrix verify that 1N5349E3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1N5349E3/TR13 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/TR13 meets industry standards.
7.What is the process for return or replacement of 1N5349E3/TR13?
All 1N5349E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5349E3/TR13, 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/TR13 part is unused and in its original packaging.
Return procedure for 1N5349E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5349E3/TR13 Tags
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MMBZ5240B-7-F
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