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Microchip Technology 1N5349AE3/TR13
- Part No.:
- 1N5349AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5349AE3/TR13.pdf
- Description:
- DIODE ZENER 12V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,310
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Product details
Overview
1N5349AE3/TR13 from Microsemi is a 12 V, ±10% tolerance, 5 W axial-leaded silicon Zener diode optimized for voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation. It delivers stable regulation at 100 mA test current with 2.5 Ω dynamic impedance and supports surge currents up to 18.7 A (8.3 ms half-sine).
For engineers reviewing the 1N5349AE3/TR13 datasheet, 1N5349AE3/TR13 pinout, 1N5349AE3/TR13 application, or 1N5349AE3/TR13 equivalent, key selection criteria include its ±10% VZ tolerance (A suffix), RoHS-compliant matte-tin plating (e3), tape-and-reel packaging (TR13), and thermal resistance of 25 °C/W junction-to-lead at 3/8" lead length.
Technical Context
This device operates as a reverse-biased voltage reference with specified zener voltage (VZ = 12 V) measured at IZT = 100 mA and TL = 25 °C. Its regulation performance is defined by ΔVZ = 0.25 V (difference between voltages at 10% and 50% of IZM) and low knee impedance (ZZK ≤ 500 Ω @ 1 mA).
The 1N5349AE3/TR13 uses a void-free thermosetting epoxy case (UL94V-0), features cathode band polarity marking, and is rated for -65 °C to +150 °C operation. Its 5 W steady-state power rating applies at TL < 25 °C with 3/8" lead length; derating follows Figure 1 in the official datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±10% - defines regulated output voltage under nominal bias conditions |
| Test Current (IZT) | 100 mA - current at which VZ is guaranteed; sets minimum operating point for regulation |
| Dynamic Impedance (ZZ) | 2.5 Ω - low AC resistance ensures minimal voltage shift across load current changes |
| Max Regulator Current (IZM) | 7.5 A - maximum DC current before thermal runaway when adequately heat sunk |
| Surge Current (IZSM) | 18.7 A (8.3 ms half-sine) - peak non-repetitive current capability for transient suppression |
| Voltage Regulation (ΔVZ) | 0.25 V - difference between VZ at 10% and 50% of IZM; quantifies regulation linearity |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables thermal design with discrete lead heatsinking |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), 0.7 g weight, cathode indicated by colored band. Leads are annealed matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Current entry terminal in forward bias; reference ground node in reverse-bias regulation | Connected to circuit ground or lower-potential node during Zener operation |
| Cathode (banded end) | Current exit terminal in forward bias; regulated voltage output node in reverse bias | Provides stable 12 V reference relative to anode; must be held positive w.r.t. anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures standardized mechanical dimensions and electrical behavior across manufacturers |
| RoHS-compliant (e3 suffix) | Meets EU Directive 2011/65/EU; matte-tin plating eliminates lead-based solder compatibility issues |
| Tape-and-reel packaging (TR13) | Enables automated SMT placement despite axial form factor via carrier tape handling |
| MIL-PRF-19500 screening option | Supports high-reliability variants (e.g., JANTXV) via prefix addition without redesign |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and bake-out prior to assembly; simplifies manufacturing flow |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Provides precise 12 V reference for TL431-like comparator function in secondary-side regulation. Use Value: Maintains ±10% output accuracy across line/load transients due to low ΔVZ (0.25 V) and stable ZZ (2.5 Ω). | Use Scenario: Clamps rail voltage during load dump or inductive kick events in automotive ECUs. IC Role / Device Role / Timing Role: Acts as shunt protector by conducting excess energy above 12 V threshold into ground path. Use Value: Withstands 18.7 A surge (8.3 ms) without failure, preventing downstream IC damage during ISO 7637-2 pulse 5a events. |
| Programmable Reference Voltage Source | Industrial Sensor Excitation |
Use Scenario: Generates stable bias voltage for precision op-amp circuits requiring low-drift references. IC Role / Device Role / Timing Role: Supplies regulated 12 V excitation to instrumentation amplifier input stages. Use Value: Delivers consistent regulation over -65 °C to +150 °C, enabling operation in extended-temperature industrial enclosures. | Use Scenario: Powers resistive temperature detectors (RTDs) or strain gauges in process control transmitters. IC Role / Device Role / Timing Role: Functions as low-noise, low-impedance voltage source for ratiometric sensor bridges. Use Value: Low ZZ (2.5 Ω) minimizes voltage droop under bridge current variations, improving measurement resolution. |
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 | ±5% VZ tolerance (B suffix) vs. ±10% (A suffix); otherwise identical electrical specs and package | Higher precision required where tighter regulation stability is critical (e.g., calibration equipment) | Select 1N5349B when ±5% tolerance is needed; 1N5349AE3/TR13 remains optimal for cost-sensitive industrial clamping |
| MMBZ5242B (SOT-23) | Surface-mount package (SOT-23), 0.5 W rating, same 12 V nominal VZ, but lower IZM (200 mA) and higher ZZ (30 Ω) | Suitable only for low-power signal-level regulation; cannot replace 1N5349AE3/TR13 in 5 W power applications | Choose MMBZ5242B only for space-constrained PCBs with sub-500 mW dissipation; retain 1N5349AE3/TR13 for power regulation |
Compared with 1N5349B and MMBZ5242B, the 1N5349AE3/TR13 uniquely balances axial-leaded manufacturability, 5 W power handling, ±10% tolerance for cost-sensitive designs, and TR13 automation readiness-making it the preferred choice for mid-power industrial clamping and feedback circuits.
Availability
1N5349AE3/TR13 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and programmable reference voltage sources requiring stable component supply and RoHS-compliant packaging.
Supply support for 1N5349AE3/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 designed specifically for robust, high-power voltage regulation in harsh-environment power systems where thermal stability, surge resilience, and JEDEC-standardized form factor are essential.
FAQ
What is the Zener voltage tolerance for 1N5349AE3/TR13?
The 1N5349AE3/TR13 has a Zener voltage tolerance of ±10%, indicated by the "A" suffix in its part number. This means its regulated voltage falls within 10.8 V to 13.2 V at 100 mA test current and 25 °C lead temperature. The e3 suffix confirms RoHS compliance, and TR13 denotes tape-and-reel packaging-none of which affect the ±10% tolerance specification of the 1N5349AE3/TR13.
How does thermal resistance impact heatsinking requirements for 1N5349AE3/TR13?
The 1N5349AE3/TR13 has a junction-to-lead thermal resistance of 25 °C/W at 3/8" lead length, meaning each watt dissipated raises the junction temperature 25 °C above lead temperature. To sustain its full 5 W rating, leads must be kept below 25 °C-typically achieved using copper traces or chassis mounting. At ambient temperatures, FR4 board mounting reduces max power to 1.47 W due to higher RθJA (85 °C/W), so the 1N5349AE3/TR13 requires careful thermal layout in high-power use cases.
Can 1N5349AE3/TR13 be used in surface-mount assemblies?
Although the 1N5349AE3/TR13 is an axial-leaded device, its TR13 tape-and-reel packaging enables automated handling in pick-and-place machines equipped with axial component feeders. It is not a surface-mount device itself, but Microsemi offers surface-mount equivalents like SMBJ5349B for true SMT applications. The 1N5349AE3/TR13 remains ideal for through-hole or hybrid assembly where 5 W power handling and axial mounting flexibility are required.
What is the maximum surge current rating for 1N5349AE3/TR13?
The 1N5349AE3/TR13 is rated for a maximum non-repetitive surge current (IZSM) of 18.7 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating allows the 1N5349AE3/TR13 to absorb transient energy in overvoltage protection circuits without degradation, provided the surge interval allows sufficient cooling between events. Exceeding this value risks permanent parametric shift or catastrophic failure of the 1N5349AE3/TR13.
How does the "e3" suffix affect soldering and reliability of 1N5349AE3/TR13?
The "e3" suffix on 1N5349AE3/TR13 indicates RoHS-compliant matte-tin plating on leads, qualified to MIL-STD-750 Method 2026. It supports standard SnPb and lead-free soldering profiles, including 260 °C for 10 seconds maximum. Unlike legacy tin-lead finishes, e3 plating eliminates intermetallic growth concerns and ensures long-term solder joint integrity-critical for field-reliable deployments of the 1N5349AE3/TR13 in industrial and automotive environments.
1N5349AE3/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:
- ±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/TR13 FAQ
1.How can I place an order for 1N5349AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5349AE3/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 1N5349AE3/TR13 reliable?
The price and inventory of 1N5349AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5349AE3/TR13 is usually 5 days.
3.What payment methods are accepted for 1N5349AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5349AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5349AE3/TR13?
1N5349AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5349AE3/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 1N5349AE3/TR13?
For technical support, including 1N5349AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5349AE3/TR13 requirements.
6.How does Aetrix verify that 1N5349AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1N5349AE3/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 1N5349AE3/TR13 meets industry standards.
7.What is the process for return or replacement of 1N5349AE3/TR13?
All 1N5349AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5349AE3/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 1N5349AE3/TR13 part is unused and in its original packaging.
Return procedure for 1N5349AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5349AE3/TR13 Tags
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