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Microchip Technology 1N5349CE3/TR13
- Part No.:
- 1N5349CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5349CE3/TR13.pdf
- Description:
- DIODE ZENER 12V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:2,493
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Product details
Overview
1N5349CE3/TR13 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 12 V, ±2% tolerance (C suffix), 2.5 Ω maximum dynamic impedance at 100 mA test current, and 750 mA maximum Zener current when adequately heat-sunk. It operates across –65°C to +150°C and is used for precision voltage reference and overvoltage protection in DC power supplies.
For engineers reviewing the 1N5349CE3/TR13 datasheet, 1N5349CE3/TR13 pinout, 1N5349CE3/TR13 application, or 1N5349CE3/TR13 equivalent, key selection criteria include Zener voltage tolerance, 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 regulator operating in reverse-biased breakdown mode. Its 12 V nominal Zener voltage is specified at 100 mA test current (IZT), with dynamic impedance measured at 1 kHz AC superimposed on DC bias - not at DC-only conditions.
The 1N5349CE3/TR13 exhibits low voltage regulation (ΔVZ = 0.25 V between 10% and 50% of IZM), tight ±2% tolerance, and high surge current capability (18.7 A, 8.3 ms half-sine). Its thermal resistance of 25 °C/W (junction-to-lead, 10 mm lead length) enables stable operation under sustained 5 W dissipation with minimal heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±2% at 100 mA - ensures stable reference within ±0.24 V across production lot |
| Power Dissipation | 5.0 W at TL ≤ 25°C - supports continuous regulation in compact power supply designs |
| Dynamic Impedance (ZZ) | 2.5 Ω max at 100 mA - minimizes output voltage variation under load transients |
| Max Zener Current (IZM) | 750 mA - defines safe DC current limit with adequate heatsinking |
| Voltage Regulation (ΔVZ) | 0.25 V - difference between VZ at 10% and 50% of IZM, indicating line regulation fidelity |
| Surge Current (IZSM) | 18.7 A (8.3 ms half-sine) - withstands common transient overloads without degradation |
| Thermal Resistance | 25 °C/W junction-to-lead - enables predictable temperature rise with standard lead mounting |
Pinout & Package
Package: T-18 axial-leaded plastic case (void-free UL94V-0 epoxy), cathode indicated by band; leads are RoHS-compliant annealed matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-bias reference node | Connected to lower-potential side of regulated circuit; forward voltage ≤1.2 V @1 A |
| Cathode | Regulated output node | Banded end; connected to higher-potential side; maintains 12 V relative to anode during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tighter regulation than ±5% (B) or ±10% (A) variants, reducing need for post-regulation trimming |
| RoHS-compliant e3 suffix | Meets EU Directive 2011/65/EU with matte-tin plating; no lead content in terminations |
| Level 1 moisture sensitivity | No dry pack required per IPC/JEDEC J-STD-020B - simplifies SMT handling and storage |
| High surge current rating | 18.7 A peak (8.3 ms) allows use in unfiltered input stages without external TVS devices |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for ESD handling controls in assembly |
Applications
| Industrial Power Supply Reference | Automotive ECU Voltage Clamp |
|---|---|
Use Scenario: Providing stable 12 V reference for feedback loop in isolated DC-DC converter. IC Role / Device Role / Timing Role: Two-terminal shunt regulator maintaining precise output voltage despite input ripple and load variation. Use Value: ±2% tolerance and 0.25 V ΔVZ ensure <±0.5% total output variation across line/load/temperature - eliminating need for trimmer potentiometers. | Use Scenario: Clamping 12 V battery rail against load-dump transients in engine control unit. IC Role / Device Role / Timing Role: Passive overvoltage protector absorbing energy spikes up to 18.7 A (8.3 ms). Use Value: Withstands ISO 7637-2 Pulse 5a without derating; eliminates need for parallel TVS diodes in cost-sensitive modules. |
| Test Equipment Calibration Source | Telecom Line Card Bias Generator |
Use Scenario: Generating traceable 12 V reference in portable multimeter calibration fixture. IC Role / Device Role / Timing Role: Precision voltage source referenced to NIST-traceable standards via fixed Zener characteristic. Use Value: Low 2.5 Ω dynamic impedance ensures <1 mV error under 10 mA sourcing - meeting ANSI C12.1 Class 0.1 accuracy requirements. | Use Scenario: Establishing stable bias point for op-amp front-end in DSL line interface card. IC Role / Device Role / Timing Role: Shunt regulator stabilizing local 12 V rail amid high-frequency noise coupling from twisted-pair lines. Use Value: 1.2 V forward voltage and Level 1 moisture rating allow direct integration into humid-environment telecom chassis without conformal coating. |
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 nominal voltage but ±5% tolerance (B suffix); otherwise identical electrical specs and package | Acceptable where ±5% regulation suffices; lower cost due to relaxed tolerance screening | Select 1N5349B if system-level testing confirms ±5% VZ meets design margin; saves ~12% BOM cost |
| MMBZ5242B (SOT-23) | Surface-mount 12 V Zener, 0.35 W rating, ±5% tolerance, 30 Ω dynamic impedance - not pin-compatible | Used in space-constrained PCBs where axial leads are impractical; requires layout change and derating for power | Choose MMBZ5242B only for new SMT-only designs; avoid retrofitting due to 7× lower power rating and different thermal path |
Compared with 1N5349B and MMBZ5242B, the 1N5349CE3/TR13 delivers tighter ±2% regulation and full 5 W capability in an axial package - making it optimal for legacy through-hole power supplies requiring high-reliability reference stability without redesign.
Availability
1N5349CE3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, test equipment calibration fixtures, and telecom line cards requiring stable component supply and long-term obsolescence management.
Supply support for 1N5349CE3/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 for ruggedized voltage regulation in harsh-environment power systems - emphasizing wide temperature range (–65°C to +150°C), high surge immunity, and MIL-qualified screening options.
FAQ
What is the Zener voltage tolerance of the 1N5349CE3/TR13?
The 1N5349CE3/TR13 has a Zener voltage tolerance of ±2%, indicated by the "C" suffix in its part number. This means its nominal 12 V regulation voltage falls within 11.76 V to 12.24 V at 100 mA test current and 25°C lead temperature. The tighter tolerance reduces calibration drift in precision reference circuits compared to ±5% (B) or ±10% (A) variants.
Does the 1N5349CE3/TR13 require dry packing before PCB assembly?
No, the 1N5349CE3/TR13 does not require dry packing. It carries IPC/JEDEC J-STD-020B moisture sensitivity level 1 rating, meaning it can be stored and assembled without baking or humidity-controlled packaging. This simplifies logistics and eliminates reflow-related delamination risk in standard FR4 board assembly.
What is the maximum surge current rating for the 1N5349CE3/TR13?
The 1N5349CE3/TR13 is rated for a maximum non-recurrent surge current (IZSM) of 18.7 A, defined as the peak of an 8.3 ms half-sine waveform. This rating enables reliable operation during automotive load-dump events or power supply turn-on surges without degradation - provided the device is mounted with ≥10 mm lead length for thermal conduction.
How does the thermal resistance of the 1N5349CE3/TR13 affect its power handling?
The 1N5349CE3/TR13 has a junction-to-lead thermal resistance of 25 °C/W at 10 mm lead length. At 5 W dissipation, this results in a 125°C temperature rise above lead temperature - requiring lead temperatures ≤25°C to stay within the +150°C max junction limit. On FR4 boards, its junction-to-ambient resistance rises to 85 °C/W, limiting usable power to ~1.47 W without copper pour enhancements.
Is the 1N5349CE3/TR13 compatible with lead-free reflow soldering?
Yes, the 1N5349CE3/TR13 supports lead-free reflow soldering with a maximum solder temperature of 260°C for 10 seconds, per MIL-STD-750 Method 2026. Its RoHS-compliant matte-tin plating ensures wetting compatibility with SAC305 and other lead-free pastes, and its UL94V-0 epoxy body withstands repeated thermal cycling without cracking or delamination.
1N5349CE3/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:
- ±2%
- 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
1N5349CE3/TR13 FAQ
1.How can I place an order for 1N5349CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5349CE3/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 1N5349CE3/TR13 reliable?
The price and inventory of 1N5349CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5349CE3/TR13 is usually 5 days.
3.What payment methods are accepted for 1N5349CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5349CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5349CE3/TR13?
1N5349CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5349CE3/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 1N5349CE3/TR13?
For technical support, including 1N5349CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5349CE3/TR13 requirements.
6.How does Aetrix verify that 1N5349CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1N5349CE3/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 1N5349CE3/TR13 meets industry standards.
7.What is the process for return or replacement of 1N5349CE3/TR13?
All 1N5349CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5349CE3/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 1N5349CE3/TR13 part is unused and in its original packaging.
Return procedure for 1N5349CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5349CE3/TR13 Tags
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