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Microchip Technology 1N5349CE3/TR12
- Part No.:
- 1N5349CE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5349CE3/TR12.pdf
- Description:
- DIODE ZENER 12V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:9,585
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Product details
Overview
1N5349CE3/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 12 V, ±2% tolerance (C suffix), 100 mA maximum Zener test current (IZT), 7.5 Ω maximum dynamic impedance (ZZ) at IZT, and 7.5 A maximum surge current (IZSM). It regulates voltage in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N5349CE3/TR12 datasheet, 1N5349CE3/TR12 pinout, 1N5349CE3/TR12 application, or 1N5349CE3/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), steady-state power rating (5 W at TL < 25 °C), reverse leakage (≤2.0 µA at VR = 8.6 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown to maintain stable output voltage under varying load and line conditions. Its low dynamic impedance (7.5 Ω) ensures minimal voltage deviation across 10–50% of IZM, and its 25 °C/W thermal resistance enables reliable operation up to 150 °C junction temperature when mounted with 3/8″ lead length from body.
The 1N5349CE3/TR12 uses void-free thermosetting epoxy encapsulation (UL94V-0), cathode band polarity marking, and is rated for 260 °C soldering (10 s max). It meets JEDEC registration requirements for 1N53xxB series and supports tape-and-reel packaging (TR12 suffix).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±2% - precise reference voltage at 100 mA test current, enabling accurate regulation in feedback loops. |
| Power Dissipation | 5.0 W at TL < 25 °C - supports high-current regulation without active cooling when leads are heat-sunk. |
| Dynamic Impedance (ZZ) | 7.5 Ω max at IZT = 100 mA - limits output voltage variation under load transients. |
| Reverse Leakage (IR) | ≤2.0 µA at VR = 8.6 V - ensures low quiescent current in standby or precision bias networks. |
| Surge Current (IZSM) | 7.5 A peak (8.3 ms half-sine) - withstands short-duration overvoltage events in protection circuits. |
| Thermal Resistance | 25 °C/W junction-to-lead - allows direct thermal path to PCB copper or chassis for sustained 5 W operation. |
| Operating Temperature | −65 °C to +150 °C - suitable for automotive under-hood, industrial control, and aerospace environments. |
Pinout & Package
Package: Axial-leaded T-18 plastic case (JEDEC DO-201AD), void-free UL94V-0 epoxy body, tin-lead or RoHS-compliant matte-tin plated leads, cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side | Connected to circuit ground or lower potential node during Zener operation. |
| Cathode | Reverse breakdown terminal / regulated output side | Banded end; connected to unregulated input; delivers stable 12 V to load when reverse-biased. |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables tighter regulation accuracy than standard ±5% (B) or ±10% (A) parts, reducing need for post-regulation trimming. |
| RoHS-compliant e3 suffix | Meets EU RoHS Directive 2011/65/EU with matte-tin plating, eliminating lead-based solder compatibility concerns. |
| Moisture sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - simplifies handling and eliminates bake-out prior to assembly. |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Withstands electrostatic discharge without parameter shift or failure - reduces handling precautions in production. |
| High surge current rating (7.5 A) | Provides robust transient overvoltage clamping in DC power rails without external TVS devices. |
Applications
| Industrial Power Supply Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback or forward converter secondary-side regulation. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing precise 12 V reference to optocoupler or error amplifier. Use Value: Maintains ±2% output voltage accuracy across line/load variations and −40 °C to +85 °C ambient, reducing need for digital compensation. |
Use Scenario: Clamping 12 V rail against load dump or inductive kick in motor drive control boards. IC Role / Device Role / Timing Role: Passive voltage clamp absorbing transient energy before it reaches downstream logic or gate drivers. Use Value: Withstands 7.5 A surge (8.3 ms) without degradation, protecting 3.3 V/5 V logic supplies without adding response delay. |
| Automotive Sensor Bias Network | Test Equipment Calibration Reference |
Use Scenario: Providing stable excitation voltage to resistive temperature sensors (RTDs) in engine control units. IC Role / Device Role / Timing Role: Low-drift voltage source delivering constant current through sensor bridge, referenced to chassis ground. Use Value: Delivers 12 V ±2% over −40 °C to +125 °C operating range, minimizing temperature-induced measurement error in analog front ends. |
Use Scenario: Serving as traceable voltage reference in portable multimeter or benchtop power supply calibration routines. IC Role / Device Role / Timing Role: Primary shunt reference in self-calibrating circuitry, monitored against metrology-grade standards. Use Value: Achieves ≤0.44 V voltage regulation (ΔVZ) between 10% and 50% of IZM, ensuring repeatable 12 V setpoints across instrument lifetime. |
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 VZ, but ±5% tolerance (B suffix) vs. ±2% (C); higher IR (≤10 µA at VR = 8.6 V). | Acceptable where tighter regulation not required; lower cost for non-critical references. | Select 1N5349B if system-level tolerance budget allows ≥±5% output variation and cost sensitivity outweighs accuracy needs. |
| MMBZ5242B (SOT-23) | Surface-mount package (SOT-23), 500 mW rating, same 12 V nominal VZ, ±5% tolerance; lower IZM (20 mA), no TR12 tape-and-reel option. | Suitable for space-constrained PCBs but cannot replace 1N5349CE3/TR12 in 5 W power applications without derating or parallel use. | Choose MMBZ5242B only for low-power signal-level referencing; avoid in primary power rail regulation due to 500 mW limit. |
Compared with 1N5349B and MMBZ5242B, the 1N5349CE3/TR12 uniquely combines ±2% tolerance, 5 W dissipation, axial-leaded mechanical robustness, and TR12 tape-and-reel compatibility-making it optimal for high-reliability, medium-power industrial and automotive voltage reference designs requiring long-term stability and manufacturability.
Availability
1N5349CE3/TR12 is available at Aetrix Electronics and suitable for industrial power supply reference, overvoltage protection clamp, and automotive sensor bias network applications requiring stable component supply, full RoHS compliance, and JEDEC-registered performance consistency.
Supply support for 1N5349CE3/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 1N53xxB series was designed specifically for ruggedized, high-stability Zener regulation in harsh-environment power systems-emphasizing thermal robustness, surge resilience, and long-term parametric stability over commercial-grade alternatives.
FAQ
What is the Zener voltage tolerance of the 1N5349CE3/TR12?
The 1N5349CE3/TR12 has a Zener voltage tolerance of ±2%, designated by the "C" suffix in the part number. This means its measured VZ at 100 mA test current falls within 11.76 V to 12.24 V at 25 °C. The tighter tolerance improves regulation accuracy in feedback networks compared to ±5% (B suffix) or ±10% (A suffix) variants of the same 12 V family.
Does the 1N5349CE3/TR12 require dry packing before reflow soldering?
No, the 1N5349CE3/TR12 does not require dry packing. It carries moisture sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored and assembled without baking or humidity-controlled handling. This simplifies manufacturing logistics and eliminates risk of popcorning during reflow.
What is the maximum surge current rating for the 1N5349CE3/TR12?
The 1N5349CE3/TR12 is rated for a maximum non-recurrent surge current (IZSM) of 7.5 A, defined as the peak of an 8.3 ms half-sine waveform. This rating reflects its ability to absorb transient energy in overvoltage protection applications without parameter shift or catastrophic failure, provided the surge occurs infrequently and within specified thermal limits.
How is polarity marked on the 1N5349CE3/TR12?
The 1N5349CE3/TR12 uses a cathode band marking: a single colored band near one end of the axial body identifies the cathode terminal. During Zener operation, this banded end must be held at a higher potential than the anode (unbanded end) to achieve reverse breakdown and voltage regulation.
Is the 1N5349CE3/TR12 RoHS compliant?
Yes, the 1N5349CE3/TR12 is RoHS compliant, as confirmed by the "e3" suffix in its full part number. It features RoHS-compliant annealed matte-tin plating on leads and meets EU Directive 2011/65/EU requirements, including restrictions on lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE.
1N5349CE3/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):
- 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/TR12 FAQ
1.How can I place an order for 1N5349CE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5349CE3/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 1N5349CE3/TR12 reliable?
The price and inventory of 1N5349CE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5349CE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5349CE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5349CE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5349CE3/TR12?
1N5349CE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5349CE3/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 1N5349CE3/TR12?
For technical support, including 1N5349CE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5349CE3/TR12 requirements.
6.How does Aetrix verify that 1N5349CE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5349CE3/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 1N5349CE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5349CE3/TR12?
All 1N5349CE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5349CE3/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 1N5349CE3/TR12 part is unused and in its original packaging.
Return procedure for 1N5349CE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5349CE3/TR12 Tags
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