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Microchip Technology 1N5349AE3/TR12
- Part No.:
- 1N5349AE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5349AE3/TR12.pdf
- Description:
- DIODE ZENER 12V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,564
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Product details
Overview
1N5349AE3/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 12 V, ±10% tolerance (A suffix), 100 mA maximum Zener current (IZM), and 2.5 Ω maximum dynamic impedance (ZZ) at 100 mA test current. It operates from –65 °C to +150 °C and is used for voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5349AE3/TR12 datasheet, 1N5349AE3/TR12 pinout, 1N5349AE3/TR12 application, or 1N5349AE3/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (18.7 A), reverse leakage behavior at 9.1 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 breakdown, maintaining stable output voltage across wide current (100 mA to 1.0 mA) and temperature (–65 °C to +150 °C) ranges. Its 25 °C/W junction-to-lead thermal resistance enables high steady-state power dissipation (5 W) when leads are mounted with 3/8″ (10 mm) length from body.
It exhibits 2.5 Ω dynamic impedance at IZT = 100 mA and 0.25 V voltage regulation (ΔVZ) between 10% and 50% of IZM - critical for precision reference stability. The cathode band marking and tin-lead or RoHS-compliant annealed matte-tin terminals ensure unambiguous polarity and solderability per MIL-STD-750 Method 2026.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±10% - defines nominal regulation point under 100 mA test current at 25 °C lead temperature |
| Power Dissipation | 5.0 W at TL < 25 °C with 3/8″ lead length - sets maximum continuous DC power with adequate heat sinking |
| Dynamic Impedance (ZZ) | 2.5 Ω max at IZT = 100 mA - determines small-signal AC voltage variation under load transients |
| Max Reverse Current (IR) | 2.0 μA at VR = 9.1 V - specifies leakage level below knee, critical for low-power bias networks |
| Surge Current (IZSM) | 18.7 A peak (8.3 ms half-sine) - defines transient overvoltage clamping capability |
| Thermal Resistance | 25 °C/W junction-to-lead - enables thermal design with discrete lead-mounting; 85 °C/W junction-to-ambient on FR4 |
| Operating Temperature | –65 °C to +150 °C - supports industrial, aerospace, and under-hood automotive environments |
Pinout & Package
Package: Axial-leaded T-18 plastic encapsulated case per JEDEC DO-204AL. Void-free UL94V-0 epoxy body; cathode indicated by colored band; RoHS-compliant matte-tin plating on leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or lower-potential rail; reverse-biased operation requires cathode at higher potential |
| Cathode | Regulated output node | Banded end; connected to feedback node or protected circuit input; maintains 12 V relative to anode during conduction |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures standardized mechanical dimensions, marking, and test methodology across 1N5333B–1N5388B series |
| 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 | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling in production |
| RoHS-compliant (e3 suffix) | Meets EU Directive 2011/65/EU with annealed matte-tin plating - supports green manufacturing requirements |
| Tape-and-reel packaging (TR12) | EIA-296 compliant carrier tape - enables automated SMT placement despite axial-leaded form factor |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback path using optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Precision voltage reference providing stable 12 V threshold for error amplifier comparison. Use Value: Maintains ±10% output regulation across line/load/temperature with 2.5 Ω dynamic impedance limiting feedback loop gain variation. | Use Scenario: Shunts transient energy from sensitive analog inputs or microcontroller I/O lines during ESD or inductive switching events. IC Role / Device Role / Timing Role: Fast-acting voltage clamp activated above 12 V, diverting surge current away from downstream ICs. Use Value: Withstands 18.7 A non-recurrent surge (8.3 ms) while holding clamped voltage within 0.25 V window (ΔVZ). |
| Industrial Sensor Excitation | Programmable Logic Controller Input Conditioning |
Use Scenario: Provides stable 12 V excitation for resistive bridge sensors (e.g., strain gauges) in harsh factory environments. IC Role / Device Role / Timing Role: Low-drift voltage source referenced to system ground, operating continuously at 1–5 mA bias current. Use Value: Delivers consistent excitation across –65 °C to +150 °C with minimal ΔVZ drift, improving measurement repeatability. | Use Scenario: Conditions 24 V DC field signals into safe logic-level inputs for PLC digital input modules. IC Role / Device Role / Timing Role: Zener-based voltage divider element establishing 12 V reference for comparator thresholds. Use Value: Enables robust signal detection with 2.0 μA leakage at 9.1 V, minimizing false triggering in noisy industrial settings. |
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 12 V nominal VZ but ±5% tolerance (B suffix) and 2.5 Ω ZZ at 100 mA - tighter regulation than 1N5349AE3/TR12's ±10% | Preferred where tighter voltage accuracy is required, e.g., precision reference circuits | Select 1N5349B if ±5% tolerance is acceptable and improved regulation outweighs cost or availability trade-offs |
| 1N4742A | 12 V Zener, ±5%, 1 W power rating, TO-204AA package - lower power, higher thermal resistance (50 °C/W) | Suitable for low-current biasing only; not rated for 5 W continuous dissipation or 18.7 A surge | Choose 1N4742A only for space-constrained or low-power designs where 5 W capability is unnecessary |
Compared with 1N5349B and 1N4742A, the 1N5349AE3/TR12 uniquely balances 5 W power handling, ±10% tolerance, RoHS compliance, and tape-and-reel automation support - making it optimal for industrial power supplies requiring robustness and manufacturability.
Availability
1N5349AE3/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and industrial sensor excitation systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N5349AE3/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xx series was designed specifically for ruggedized 5 W voltage regulation in mission-critical power systems - emphasizing thermal robustness, surge resilience, and extended temperature operation.
FAQ
What is the Zener voltage tolerance for 1N5349AE3/TR12?
The 1N5349AE3/TR12 has a Zener voltage tolerance of ±10%, indicated by the "A" suffix in its part number. This means its actual regulation voltage falls between 10.8 V and 13.2 V at 100 mA test current and 25 °C lead temperature, per Microsemi's published electrical characteristics table.
Does 1N5349AE3/TR12 require dry packing before PCB assembly?
No, the 1N5349AE3/TR12 has moisture sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it does not require dry packing or baking prior to reflow soldering. Its void-free UL94V-0 epoxy encapsulation ensures inherent moisture resistance.
What is the maximum surge current rating for 1N5349AE3/TR12?
The 1N5349AE3/TR12 is rated for a maximum non-recurrent surge current (IZSM) of 18.7 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating enables reliable transient suppression in power supply and protection circuits.
How is polarity marked on the 1N5349AE3/TR12 package?
The 1N5349AE3/TR12 uses a cathode band marking on the plastic body to indicate polarity. During normal Zener operation, the banded end (cathode) must be held at a higher potential than the unbanded end (anode) to achieve reverse-bias breakdown regulation at 12 V.
Is 1N5349AE3/TR12 compatible with lead-free reflow processes?
Yes, the 1N5349AE3/TR12 features RoHS-compliant annealed matte-tin plating on its leads and is qualified for soldering at 260 °C for up to 10 seconds - fully compatible with standard lead-free reflow profiles per MIL-STD-750 Method 2026.
1N5349AE3/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:
- ±10%
- 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
1N5349AE3/TR12 FAQ
1.How can I place an order for 1N5349AE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5349AE3/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 1N5349AE3/TR12 reliable?
The price and inventory of 1N5349AE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5349AE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5349AE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5349AE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5349AE3/TR12?
1N5349AE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5349AE3/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 1N5349AE3/TR12?
For technical support, including 1N5349AE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5349AE3/TR12 requirements.
6.How does Aetrix verify that 1N5349AE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5349AE3/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 1N5349AE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5349AE3/TR12?
All 1N5349AE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5349AE3/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 1N5349AE3/TR12 part is unused and in its original packaging.
Return procedure for 1N5349AE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5349AE3/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
Diodes Incorporated
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Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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Diodes Incorporated
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MM5Z5V1ST1G
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Micro Commercial Co
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Diodes Incorporated
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