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Microchip Technology 1N5349E3/TR12
- Part No.:
- 1N5349E3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5349E3/TR12.pdf
- Description:
- DIODE ZENER 12V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:8,937
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Product details
Overview
1N5349E3/TR12 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 0.25 V maximum voltage regulation (ΔVZ). It operates across –65°C to +150°C and is used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5349E3/TR12 datasheet, 1N5349E3/TR12 pinout, 1N5349E3/TR12 application, or 1N5349E3/TR12 equivalent, key selection criteria include Zener voltage stability under varying load current, thermal resistance (25 °C/W junction-to-lead), surge current rating (7.5 A), RoHS compliance (e3 suffix), and tape-and-reel packaging (TR12).
Technical Context
This device functions as a two-terminal voltage reference where reverse-biased operation maintains stable output voltage across wide current ranges (100 mA IZM at TL = 25°C). Its low dynamic impedance (2.5 Ω) ensures minimal voltage deviation with load changes, while the 25 °C/W thermal resistance enables reliable 5 W dissipation with standard lead-length heat sinking.
The 1N5349E3/TR12 exhibits tight voltage regulation (ΔVZ ≤ 0.25 V between 10% and 50% of IZM), supports high surge currents (7.5 A, 8.3 ms half-sine), and features moisture sensitivity level 1 per J-STD-020B-no dry pack required. Cathode polarity is marked by a band; operation requires cathode-positive biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V nominal, ±5% tolerance - defines precise regulation point for feedback or clamping circuits |
| Power Dissipation | 5.0 W at TL < 25°C (3/8″ lead length) - sets maximum continuous DC power handling with adequate heatsinking |
| Max Regulator Current (IZM) | 100 mA - maximum steady-state reverse current before thermal runaway at rated power |
| Dynamic Impedance (ZZ) | 2.5 Ω max at IZT = 100 mA - determines voltage variation under load transients |
| Voltage Regulation (ΔVZ) | 0.25 V max - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
| Surge Current (IZSM) | 7.5 A peak (8.3 ms half-sine) - defines transient overvoltage absorption capability without failure |
| Thermal Resistance | 25 °C/W junction-to-lead - enables thermal design using lead conduction, not PCB pads alone |
| Operating Temperature | –65°C to +150°C - supports industrial and automotive under-hood environments |
Pinout & Package
Package: T-18 axial-leaded plastic case (void-free UL94V-0 epoxy), 0.7 g weight, cathode indicated by band. Leads are tin-lead or RoHS-compliant matte-tin plated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node in shunt regulator | Connected to system ground or lower-potential rail; reverse voltage applied between cathode and anode |
| Cathode | Zener regulation terminal / Input node in shunt regulator | Banded end; connected to regulated voltage node; must be held positive relative to anode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures standardized mechanical dimensions, test methods, and interchangeability across qualified suppliers |
| RoHS-compliant (e3 suffix) | Meets EU Directive 2011/65/EU with lead-free terminations and compliant materials |
| Tape-and-reel packaging (TR12) | Enables automated SMT placement compatibility despite axial-leaded form factor via carrier tape |
| Level 1 moisture sensitivity | Eliminates baking requirement prior to assembly-reduces manufacturing cost and risk of damage |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Withstands human-body-model ESD events without parameter shift or failure-simplifies handling |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback or forward converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 12 V reference to TL431 or similar error amplifier. Use Value: Enables ±1% output regulation accuracy with low ΔVZ and stable VZ over temperature and line/load variations. | Use Scenario: Protecting downstream ICs from transient overvoltage on 12 V rail during load dump or inductive switching. IC Role / Device Role / Timing Role: Clamping element that conducts above 12.6 V (VZ + tolerance), diverting excess energy to ground. Use Value: Absorbs 7.5 A surge (8.3 ms) without degradation, preventing latch-up or burnout of sensitive logic or analog circuitry. |
| Industrial Sensor Excitation | Programmable Voltage Reference |
Use Scenario: Providing stable excitation voltage to bridge-based pressure or strain sensors in harsh factory environments. IC Role / Device Role / Timing Role: Low-drift, high-current-capable reference source replacing less robust IC references. Use Value: Maintains 12 V ±0.6 V across –40°C to +85°C ambient, supporting 0.1% sensor measurement accuracy. | Use Scenario: Setting precise thresholds in comparator circuits for battery monitoring or fault detection. IC Role / Device Role / Timing Role: Fixed-voltage reference node with low dynamic impedance for fast response to input transients. Use Value: Delivers 12 V reference with only 0.25 V variation from 10–50 mA load change-critical for hysteresis control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5349B | No e3 RoHS marking; tin-lead plating; same VZ, IZM, ZZ, and package | Not suitable for lead-free assembly processes requiring RoHS compliance | Select 1N5349B only for legacy tin-lead reflow or non-RoHS programs |
| MMSZ5242B-TP | Surface-mount SOD-123 package; 500 mW rating; 12 V ±5%; higher ZZ (9 Ω) | Limited to low-power applications; unsuitable for 5 W continuous dissipation or surge clamping | Choose MMSZ5242B-TP only when board space constraints prohibit axial leads and power demand is < 0.5 W |
Compared with 1N5349B and MMSZ5242B-TP, the 1N5349E3/TR12 uniquely combines full 5 W power handling, RoHS compliance, tape-and-reel automation support, and JEDEC-standardized axial form factor-making it optimal for industrial power supplies requiring reliability, service life, and process compatibility.
Availability
1N5349E3/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-lifecycle availability, and RoHS-compliant sourcing.
Supply support for 1N5349E3/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 as a JEDEC-standardized, high-power Zener platform for ruggedized voltage regulation-emphasizing thermal robustness, surge resilience, and long-term parametric stability in mission-critical power systems.
FAQ
What is the Zener voltage tolerance of the 1N5349E3/TR12?
The 1N5349E3/TR12 has a nominal Zener voltage of 12 V with ±5% tolerance, consistent with the "B" suffix designation in the 1N53xxB family. This means its actual VZ falls between 11.4 V and 12.6 V at 100 mA test current and 25°C lead temperature. The e3 suffix confirms RoHS compliance but does not alter voltage tolerance specifications.
Can the 1N5349E3/TR12 be used in surface-mount designs?
The 1N5349E3/TR12 is an axial-leaded T-18 package and is not a surface-mount device. However, it is supplied in EIA-296 tape-and-reel format (TR12 suffix) for automated pick-and-place insertion into through-hole pads. For true SMT implementation, consider Microsemi's SMBJ5349B or ON Semiconductor's 1N5349BRLG-but note their lower power ratings (1.5 W vs. 5 W).
What is the maximum surge current rating for the 1N5349E3/TR12?
The 1N5349E3/TR12 is rated for a maximum non-recurrent surge current (IZSM) of 7.5 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating assumes proper mounting (3/8″ lead length) and allows the device to absorb transient overvoltages-such as load dump spikes-without parametric shift or catastrophic failure.
How does thermal resistance affect the 1N5349E3/TR12's power handling?
The 1N5349E3/TR12 has a junction-to-lead thermal resistance of 25 °C/W. At 25°C lead temperature, it delivers full 5 W; above that, power must be derated linearly-e.g., at TL = 75°C, max power drops to 3.75 W. Unlike surface-mount Zeners, its thermal path relies primarily on lead conduction, not PCB copper area, making lead length and board layout critical.
Is the 1N5349E3/TR12 suitable for automotive under-hood applications?
Yes-the 1N5349E3/TR12 is rated for –65°C to +150°C operating and storage temperatures, meets MIL-STD-750 ESD testing (Method 1020), and has Level 1 moisture sensitivity-eliminating bake requirements. Its 5 W power rating, 7.5 A surge capability, and stable ΔVZ make it appropriate for engine control unit (ECU) power rails and sensor interfaces where thermal and electrical stress are severe.
1N5349E3/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:
- ±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/TR12 FAQ
1.How can I place an order for 1N5349E3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5349E3/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 1N5349E3/TR12 reliable?
The price and inventory of 1N5349E3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5349E3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5349E3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5349E3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5349E3/TR12?
1N5349E3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5349E3/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 1N5349E3/TR12?
For technical support, including 1N5349E3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5349E3/TR12 requirements.
6.How does Aetrix verify that 1N5349E3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5349E3/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 1N5349E3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5349E3/TR12?
All 1N5349E3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5349E3/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 1N5349E3/TR12 part is unused and in its original packaging.
Return procedure for 1N5349E3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5349E3/TR12 Tags
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