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Microchip Technology 1N5349BE3/TR13
- Part No.:
- 1N5349BE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5349BE3/TR13.pdf
- Description:
- DIODE ZENER 12V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,764
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Product details
Overview
1N5349BE3/TR13 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 12 V, ±5% tolerance (B suffix), 100 mA maximum Zener current (IZM), 2.5 Ω dynamic impedance (ZZ), and 0.25 V voltage regulation (ΔVZ) - used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5349BE3/TR13 datasheet, 1N5349BE3/TR13 pinout, 1N5349BE3/TR13 application, or 1N5349BE3/TR13 equivalent, key selection criteria include Zener voltage stability under varying load currents, thermal resistance (25 °C/W junction-to-lead), surge current capability (18.7 A), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-biased mode, with cathode indicated by a band and requiring the banded end to be held positive relative to the anode. It delivers stable 12 V regulation across a wide operating current range (100 mA IZM) and temperature span (–65 °C to +150 °C).
Its low dynamic impedance (2.5 Ω at 100 mA test current) and tight voltage regulation (0.25 V ΔVZ between 10% and 50% of IZM) ensure minimal output variation under transient load changes. Thermal design relies on lead-length-dependent junction-to-lead resistance (25 °C/W at 3/8″ lead length) rather than board-mounted ambient dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V nominal, ±5% tolerance - defines precise regulation setpoint for feedback networks |
| Power Dissipation | 5.0 W at 25 °C lead temperature - requires mechanical heat sinking via leads for full rating |
| Zener Test Current (IZT) | 100 mA - operating point where VZ and dynamic impedance are specified |
| Dynamic Impedance (ZZ) | 2.5 Ω - low AC resistance ensures stable voltage under small-signal ripple or noise |
| Voltage Regulation (ΔVZ) | 0.25 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
| Surge Current (IZSM) | 18.7 A peak (8.3 ms half-sine) - supports transient overvoltage clamping without failure |
| Thermal Resistance | 25 °C/W junction-to-lead (3/8″ lead length) - dictates minimum lead thermal mass needed for safe 5 W operation |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode identified by color band; RoHS-compliant matte-tin plated leads solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-bias reference node | Connected to circuit ground or lower-potential rail; current flows into cathode during regulation |
| Cathode | Zener voltage output terminal | Banded end; held at regulated 12 V above anode; connects to feedback node or protected load |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 5 W Zener | Industry-standard footprint and reliability for high-power voltage reference applications |
| ±5% voltage tolerance (B suffix) | Guarantees VZ between 11.4 V and 12.6 V at 25 °C, enabling predictable loop gain in feedback designs |
| Moisture sensitivity Level 1 | No dry-pack required - simplifies handling and eliminates bake-out prior to assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Robust handling in manufacturing without special static control beyond standard practices |
| RoHS-compliant (e3 suffix) | Lead-free matte-tin plating meets environmental compliance without sacrificing solderability or reliability |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Primary-side Zener reference establishing precise 12 V threshold for TL431 or shunt regulator biasing. Use Value: Maintains ±5% output accuracy across line/load transients due to low ΔVZ (0.25 V) and stable ZZ (2.5 Ω). | Use Scenario: Clamping surge-induced voltage spikes on DC rails in industrial motor drives or telecom power systems. IC Role / Device Role / Timing Role: Two-terminal passive clamp absorbing transient energy up to 18.7 A (8.3 ms) without degradation. Use Value: Prevents downstream IC damage by limiting rail voltage to ≤12.6 V (max VZ + ΔVZ) during surges. |
| Programmable Voltage Reference | Temperature-Stable Bias Generator |
Use Scenario: Providing stable reference for analog sensor signal conditioning circuits in automotive engine control units. IC Role / Device Role / Timing Role: Precision 12 V source for op-amp biasing and ADC reference scaling in harsh-temperature environments. Use Value: Delivers <0.25 V drift over –40 °C to +125 °C due to low thermal resistance (25 °C/W) and wide operating range (–65 °C to +150 °C). | Use Scenario: Generating fixed bias voltages for RF amplifier stages in base station transceivers. IC Role / Device Role / Timing Role: Low-noise, low-impedance DC bias node decoupled from supply ripple via series resistor and local capacitance. Use Value: Achieves <2.5 Ω effective source impedance at 100 kHz, minimizing modulation of RF stage quiescent current. |
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 (non-e3, non-TR) | Same electrical specs, but SnPb-plated leads and bulk packaging - not RoHS-compliant or tape-and-reel ready | Requires reflow profile adjustment and dry-pack handling; unsuitable for automated SMT lines requiring lead-free compliance | Select only for legacy repair or non-RoHS programs where tape-and-reel is unnecessary |
| MMSZ5242B-TP (Micro Commercial Components) | Surface-mount SOD-123 package, 500 mW rating, 12 V ±5%, higher ZZ (9 Ω), lower IZM (41 mA) | Limited to low-power biasing; cannot replace 1N5349BE3/TR13 in 5 W applications without derating or parallel devices | Use only in space-constrained PCBs where thermal mass and power demand are <1 W |
Compared with 1N5349B and MMSZ5242B-TP, the 1N5349BE3/TR13 uniquely combines 5 W power handling, axial-leaded mechanical robustness, RoHS compliance, and tape-and-reel delivery - making it the sole option for high-reliability, high-power, automated-assembly Zener reference designs.
Availability
1N5349BE3/TR13 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and programmable voltage references requiring stable component supply across automotive, industrial, and telecom production programs.
Supply support for 1N5349BE3/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 1N53xxB series was engineered for ruggedized, high-power voltage regulation in mission-critical power systems - emphasizing thermal stability, surge resilience, and long-term parametric consistency under extreme environmental stress.
FAQ
What is the Zener voltage tolerance of the 1N5349BE3/TR13?
The 1N5349BE3/TR13 has a ±5% Zener voltage tolerance, confirmed by the "B" suffix in its part number per Microsemi's official documentation. This means its regulated voltage falls between 11.4 V and 12.6 V at 25 °C with 100 mA test current. The e3 suffix indicates RoHS compliance, and TR13 denotes tape-and-reel packaging - none of which affect the voltage tolerance specification of the 1N5349BE3/TR13.
Can the 1N5349BE3/TR13 be used in surface-mount designs?
No, the 1N5349BE3/TR13 is an axial-leaded T-18 package device and is not compatible with surface-mount assembly processes. Its mechanical form factor requires through-hole mounting with 3/8″ lead length for rated 5 W operation. For SMT alternatives, consider the SMBJ5349B or SMBG5349B - surface-mount equivalents explicitly listed in Microsemi's documentation for the 1N53xxB family, not the 1N5349BE3/TR13 itself.
What is the maximum surge current rating for the 1N5349BE3/TR13?
The 1N5349BE3/TR13 has 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 is validated under JEDEC conditions and enables reliable transient clamping in power supply input stages. Exceeding this value, even briefly, risks irreversible junction damage - so system-level fusing or current-limiting must be designed around the 18.7 A limit of the 1N5349BE3/TR13.
How does thermal resistance impact the 1N5349BE3/TR13's power rating?
The 1N5349BE3/TR13 has a junction-to-lead thermal resistance of 25 °C/W when mounted with 3/8″ (10 mm) lead length from the body. This means each watt dissipated raises the junction temperature 25 °C above lead temperature. At 25 °C lead temperature, full 5 W is allowed; above that, power must be linearly derated. Ambient-mounted ratings (1.47 W on FR4) do not apply to the 1N5349BE3/TR13 unless leads are shortened - its design intent is lead-conducted cooling, not board conduction.
Is the 1N5349BE3/TR13 suitable for precision voltage reference applications?
Yes, the 1N5349BE3/TR13 supports precision reference use via its low voltage regulation (ΔVZ = 0.25 V) and tight ±5% tolerance, but requires stable thermal management and clean current sourcing. Its 2.5 Ω dynamic impedance ensures minimal AC variation, and its –65 °C to +150 °C operating range allows deployment in extended-temperature systems. However, for sub-1% absolute accuracy, external calibration or trimming is still recommended - the 1N5349BE3/TR13 provides high-stability foundation, not metrology-grade precision.
1N5349BE3/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:
- ±5%
- 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
1N5349BE3/TR13 FAQ
1.How can I place an order for 1N5349BE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5349BE3/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 1N5349BE3/TR13 reliable?
The price and inventory of 1N5349BE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5349BE3/TR13 is usually 5 days.
3.What payment methods are accepted for 1N5349BE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5349BE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5349BE3/TR13?
1N5349BE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5349BE3/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 1N5349BE3/TR13?
For technical support, including 1N5349BE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5349BE3/TR13 requirements.
6.How does Aetrix verify that 1N5349BE3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1N5349BE3/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 1N5349BE3/TR13 meets industry standards.
7.What is the process for return or replacement of 1N5349BE3/TR13?
All 1N5349BE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5349BE3/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 1N5349BE3/TR13 part is unused and in its original packaging.
Return procedure for 1N5349BE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5349BE3/TR13 Tags
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