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Microchip Technology 1N5348C/TR12
- Part No.:
- 1N5348C/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5348C/TR12.pdf
- Description:
- DIODE ZENER 11V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:9,944
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Product details
Overview
1N5348C/TR12 from Microsemi is a 5 W, 11 V ±2% axial-leaded silicon Zener diode optimized for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation. It delivers stable regulation across 10–100 mA operating current with 2.5 Ω dynamic impedance at 125 mA test current and supports operation from –65°C to +150°C.
For engineers reviewing the 1N5348C/TR12 datasheet, 1N5348C/TR12 pinout, 1N5348C/TR12 application, or 1N5348C/TR12 equivalent, key selection criteria include its ±2% tolerance (C suffix), 5 W steady-state power rating at 25°C lead temperature, low 2.5 Ω Zener impedance, 8.0 V maximum reverse current test voltage, and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining a stable 11 V reference by conducting reverse current above its breakdown threshold. Its low thermal resistance (25 °C/W junction-to-lead at 10 mm lead length) enables high-current regulation when mounted with adequate heat sinking.
It exhibits minimal voltage variation (ΔVZ = 0.25 V) between 10% and 50% of maximum Zener current (IZM = 8.0 A), and maintains tight regulation under transient surge conditions up to 18.7 A (8.3 ms half-sine). The cathode band identifies polarity, requiring the banded end to be biased positive relative to the anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11 V ±2% - precise reference for feedback networks requiring tight tolerance |
| Test Current (IZT) | 125 mA - defined operating point for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 2.5 Ω at IZT - ensures minimal output voltage shift under load current changes |
| Max Reverse Current (IR) | 5.0 µA at 8.0 V - guarantees low leakage in standby or high-impedance bias networks |
| Max Regulator Current (IZM) | 8.0 A - peak DC current capability with proper heat sinking at TL = 25°C |
| Voltage Regulation (ΔVZ) | 0.25 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
| Power Dissipation (PD) | 5.0 W at TL = 25°C - defines continuous power handling with 3/8″ lead length heat path |
Pinout & Package
Package: Axial-leaded T-18 plastic case (Void-free UL94V-0 epoxy), 0.7 g weight, moisture sensitivity Level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; reverse-biased operation requires cathode at higher potential |
| Cathode | Regulated output node | Banded end; connected to regulated rail or error amplifier input; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables accurate voltage references without post-calibration in industrial power supplies |
| JEDEC-registered 1N53xxB series | Ensures standardized mechanical dimensions and electrical behavior across qualified suppliers |
| RoHS-compliant matte-tin plating (e3 suffix) | Supports lead-free reflow soldering per JEDEC J-STD-020B without tin whisker risk |
| Low 25 °C/W junction-to-lead thermal resistance | Allows 5 W dissipation with minimal temperature rise using PCB copper as heatsink |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for handling precautions during manual assembly or prototyping |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in the optocoupler feedback path of isolated DC-DC converters to regulate output voltage within ±2%. IC Role / Device Role / Timing Role: Shunt reference providing stable 11 V threshold to drive optocoupler LED current. Use Value: Tight 2.5 Ω dynamic impedance minimizes output voltage drift across line/load transients. |
Use Scenario: Placed across sensitive IC inputs to clamp transient overvoltages exceeding 11 V. IC Role / Device Role / Timing Role: Fast-acting shunt clamp absorbing surge energy before downstream components are stressed. Use Value: Withstands 18.7 A non-recurrent surges (8.3 ms half-sine), protecting logic interfaces from ESD or inductive kickback. |
| Programmable Voltage Reference | Industrial Sensor Excitation |
Use Scenario: Paired with precision resistors to generate stable 11 V excitation for analog sensor bridges. IC Role / Device Role / Timing Role: Primary voltage reference source for ratiometric measurement systems. Use Value: ±2% initial tolerance and <0.25 V regulation delta ensure repeatable bridge output scaling. |
Use Scenario: Supplies regulated bias to RTD or strain gauge signal conditioning circuits in PLC modules. IC Role / Device Role / Timing Role: Low-drift shunt regulator maintaining constant excitation despite supply ripple. Use Value: Stable 11 V output over –65°C to +150°C enables reliable operation in harsh industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5348B/TR12 | ±5% tolerance (B suffix); otherwise identical electrical specs and package | Acceptable where ±5% regulation accuracy suffices (e.g., non-critical biasing) | Select 1N5348B/TR12 for cost-sensitive designs where tighter tolerance is unnecessary |
| 1N5348D/TR12 | ±1% tolerance (D suffix); higher test cost and longer lead time | Required for metrology-grade references or calibration equipment demanding highest initial accuracy | Choose 1N5348D/TR12 only when system-level accuracy mandates ±1% VZ stability |
Compared with 1N5348B/TR12, the 1N5348C/TR12 offers twice the voltage accuracy at modest cost premium; versus 1N5348D/TR12, it provides sufficient precision for most industrial feedback loops while avoiding the yield penalty and extended sourcing of ±1% units.
Availability
1N5348C/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and programmable voltage reference designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N5348C/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N53xxB series was engineered for ruggedized voltage regulation in mission-critical power systems, emphasizing thermal robustness, surge resilience, and long-term parametric stability under extreme temperature cycling.
FAQ
What is the Zener voltage tolerance of the 1N5348C/TR12?
The 1N5348C/TR12 has a Zener voltage tolerance of ±2%, indicated by the "C" suffix per Microsemi's documentation. This means its nominal 11 V breakdown voltage falls within 10.78 V to 11.22 V at 125 mA test current and 25°C lead temperature. This tolerance is tighter than the ±5% of the 1N5348B/TR12 variant and supports precision regulation without trimming.
What is the maximum continuous power dissipation for the 1N5348C/TR12?
The 1N5348C/TR12 is rated for 5.0 W steady-state power dissipation at a lead temperature (TL) of 25°C with 3/8″ (10 mm) lead length from the body. Derating is required above 25°C - approximately 40 mW/°C - per the published power derating curve. On FR4 PCB with 1 oz copper, its usable power drops to 1.47 W at 25°C ambient due to higher junction-to-ambient thermal resistance.
How is polarity marked on the 1N5348C/TR12?
The 1N5348C/TR12 uses a cathode band to indicate polarity: the banded end is the cathode and must be held at a more positive potential than the unmarked (anode) end during normal Zener operation. This marking complies with JEDEC standards and is visible on the black epoxy T-18 case. Incorrect polarity results in forward conduction (~1.2 V drop) rather than regulation.
What does the "TR12" suffix mean in 1N5348C/TR12?
The "TR12" suffix indicates tape-and-reel packaging per EIA-296 standard, with 12,000 units per reel. This format supports automated SMT placement despite the device's axial-leaded construction - the leads are straightened and oriented for pick-and-place compatibility. The "e3" RoHS compliance marker is also included in the full part number per Microsemi's revision D datasheet.
What is the surge current rating of the 1N5348C/TR12?
The 1N5348C/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 reflects its ability to absorb transient energy - such as ESD events or inductive switching spikes - without degradation. Surge capability is maintained across the full operating temperature range and is independent of steady-state power limits.
1N5348C/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):
- 11 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2.5 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 8 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
1N5348C/TR12 FAQ
1.How can I place an order for 1N5348C/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5348C/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 1N5348C/TR12 reliable?
The price and inventory of 1N5348C/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5348C/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5348C/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5348C/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5348C/TR12?
1N5348C/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5348C/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 1N5348C/TR12?
For technical support, including 1N5348C/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5348C/TR12 requirements.
6.How does Aetrix verify that 1N5348C/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5348C/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 1N5348C/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5348C/TR12?
All 1N5348C/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5348C/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 1N5348C/TR12 part is unused and in its original packaging.
Return procedure for 1N5348C/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5348C/TR12 Tags
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