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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Microchip Technology 1N5348CE3/TR8

Name: 1N5348CE3/TR8
Brand: Microchip Technology
SKU: 1N5348CE3/TR8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5348CE3/TR8

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: T-18, Axial

Datasheet:: 1N5348CE3/TR8.pdf

Description:: DIODE ZENER 11V 5W T18

Quantity:: RFQ Add To RFQ list

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Product details

Overview

1N5348CE3/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 11 V, ±2% tolerance (C suffix), 125 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 1N5348CE3/TR8 datasheet, 1N5348CE3/TR8 pinout, 1N5348CE3/TR8 application, or 1N5348CE3/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (8.0 A), moisture sensitivity level (Level 1), and RoHS compliance (e3 suffix).

Technical Context

This device operates as a two-terminal voltage regulator in reverse-biased mode, with cathode indicated by band and rated for continuous DC operation up to 125 mA when adequately heat-sunk at 25 °C lead temperature. Its low dynamic impedance (2.5 Ω) ensures stable regulation across varying load currents.

The 1N5348CE3/TR8 exhibits minimal voltage drift over temperature (−65 °C to +150 °C operating range) and withstands non-repetitive 8.3 ms half-sine surge currents up to 8.0 A. It is moisture-insensitive (IPC/JEDEC J-STD-020B Level 1) and requires no dry pack.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	11 V ±2% - precise reference for feedback networks requiring tight regulation stability.
Power Dissipation	5.0 W at T_L = 25 °C (3/8″ lead length) - supports high-current regulation with proper heatsinking.
Dynamic Impedance (Z_Z)	2.5 Ω - low AC impedance ensures minimal output voltage variation under changing load conditions.
Max Regulator Current (I_ZM)	125 mA - defines safe continuous reverse current limit before thermal runaway.
Voltage Regulation (ΔV_Z)	0.25 V - difference between V_Z measured at 10% and 50% of I_ZM, indicating line regulation quality.
Surge Current (I_ZSM)	8.0 A (8.3 ms half-sine) - enables transient overvoltage clamping without failure.
Thermal Resistance	25 °C/W junction-to-lead - allows direct thermal path to PCB copper or heatsink via axial leads.

Pinout & Package

Package: Axial-leaded T-18 plastic case (void-free thermosetting epoxy, UL94V-0), cathode identified by color band. Leads are annealed matte-tin plated per MIL-STD-750 Method 2026.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Reverse-bias reference node	Connected to lower-potential side of regulated circuit; forms return path for Zener current.
Cathode	Regulated output node	Banded end; connected to higher-potential side; provides stable 11 V reference relative to anode.

Key Features

Feature	Design Value
±2% Zener voltage tolerance	Enables tighter feedback loop control vs. ±5% (B) or ±10% (A) variants, reducing output error in precision supplies.
RoHS-compliant e3 suffix	Meets EU Directive 2011/65/EU with lead-free matte-tin plating and halogen-free epoxy body.
Level 1 moisture sensitivity	Eliminates dry-pack requirement and bake-out prior to assembly - reduces manufacturing cost and risk.
High surge current capability	Withstands 8.0 A transient surges (8.3 ms), enabling use in input-stage clamping without external TVS devices.
Nonsensitive to ESD	Qualified per MIL-STD-750 Method 1020 - survives >4 kV HBM without parameter shift or failure.

Applications

Switch-Mode Power Supply Feedback	Overvoltage Protection Clamp
Use Scenario: Used in TL431-based or discrete op-amp feedback circuits to regulate 12 V output rails in AC/DC adapters and DC/DC converters. IC Role / Device Role / Timing Role: Provides stable 11 V reference to comparator input, enabling accurate output voltage setpoint. Use Value: ±2% tolerance ensures output stays within ±1% of nominal 12 V under line/load transients.	Use Scenario: Placed across DC bus or IC supply rail to clamp voltage spikes during switching events or load dump. IC Role / Device Role / Timing Role: Acts as shunt limiter - conducts excess current above 11 V to protect downstream MOSFETs or controllers. Use Value: 8.0 A surge rating absorbs 60 J (½ × 8 A² × 0.0083 s) without degradation.
Programmable Voltage Reference	Industrial Sensor Excitation
Use Scenario: Paired with resistive dividers to generate adjustable reference voltages for ADCs or DACs in data acquisition modules. IC Role / Device Role / Timing Role: Serves as primary voltage source with low tempco and low dynamic impedance for ratiometric accuracy. Use Value: 2.5 Ω Z_Z minimizes loading error on divider networks driving high-impedance inputs.	Use Scenario: Supplies excitation voltage to strain gauges or RTDs in weigh scales and pressure transmitters. IC Role / Device Role / Timing Role: Delivers stable bias to bridge sensors while rejecting supply ripple and noise. Use Value: ΔV_Z = 0.25 V ensures sensor output drift remains below 0.1% FS over full current range.

Switch-Mode Power Supply Feedback

Overvoltage Protection Clamp

Use Scenario: Used in TL431-based or discrete op-amp feedback circuits to regulate 12 V output rails in AC/DC adapters and DC/DC converters.

IC Role / Device Role / Timing Role: Provides stable 11 V reference to comparator input, enabling accurate output voltage setpoint.

Use Value: ±2% tolerance ensures output stays within ±1% of nominal 12 V under line/load transients.

Use Scenario: Placed across DC bus or IC supply rail to clamp voltage spikes during switching events or load dump.

IC Role / Device Role / Timing Role: Acts as shunt limiter - conducts excess current above 11 V to protect downstream MOSFETs or controllers.

Use Value: 8.0 A surge rating absorbs 60 J (½ × 8 A² × 0.0083 s) without degradation.

Programmable Voltage Reference

Industrial Sensor Excitation

Use Scenario: Paired with resistive dividers to generate adjustable reference voltages for ADCs or DACs in data acquisition modules.

IC Role / Device Role / Timing Role: Serves as primary voltage source with low tempco and low dynamic impedance for ratiometric accuracy.

Use Value: 2.5 Ω Z_Z minimizes loading error on divider networks driving high-impedance inputs.

Use Scenario: Supplies excitation voltage to strain gauges or RTDs in weigh scales and pressure transmitters.

IC Role / Device Role / Timing Role: Delivers stable bias to bridge sensors while rejecting supply ripple and noise.

Use Value: ΔV_Z = 0.25 V ensures sensor output drift remains below 0.1% FS over full current range.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5348B	Same 11 V nominal voltage but ±5% tolerance (B suffix); otherwise identical electrical specs and package.	Suitable where tighter regulation not required; lower cost in high-volume industrial power supplies.	Select 1N5348B if system-level tolerance budget allows ±5% reference error.
MMBZ5242B	Surface-mount SOD-123 package; 11 V ±5%, 225 mW power rating - not a drop-in replacement.	Used in space-constrained PCBs where axial leads are impractical; limited to low-power biasing.	Choose MMBZ5242B only for compact designs accepting reduced power handling and looser tolerance.

Compared with 1N5348B and MMBZ5242B, the 1N5348CE3/TR8 delivers superior voltage accuracy (±2% vs. ±5%), higher power capability (5 W vs. 225 mW), and axial-mount flexibility - making it optimal for robust, precision-regulated power stages.

Availability

1N5348CE3/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and programmable voltage references requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for 1N5348CE3/TR8 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 1N53xx series was designed for ruggedized voltage regulation in harsh-environment power systems - emphasizing thermal robustness, surge immunity, and long-term parametric stability.

FAQ

What is the Zener voltage tolerance of the 1N5348CE3/TR8?

The 1N5348CE3/TR8 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in its part number. This means its actual regulation voltage falls within 10.78 V to 11.22 V at 25 °C when tested at the specified 125 mA test current (I_ZT). This tighter tolerance supports precision feedback and reference applications where ±5% variants like 1N5348B would introduce excessive error.

Is the 1N5348CE3/TR8 RoHS compliant?

Yes, the 1N5348CE3/TR8 is RoHS compliant, confirmed by the "e3" suffix in its full part number. It uses lead-free matte-tin plated leads and a halogen-free, void-free thermosetting epoxy body meeting UL94V-0 flammability requirements - fully compliant with EU Directive 2011/65/EU and subsequent amendments.

What is the maximum surge current rating for the 1N5348CE3/TR8?

The 1N5348CE3/TR8 is rated for a non-repetitive peak surge current (I_ZSM) of 8.0 A, defined as the maximum amplitude of an 8.3 ms half-sine waveform. This rating enables reliable transient clamping in power supply inputs and motor drive circuits without requiring additional TVS diodes - provided the surge energy does not exceed the device's single-pulse capability.

How is polarity marked on the 1N5348CE3/TR8?

The 1N5348CE3/TR8 uses a cathode band to indicate polarity: the banded end is the cathode and must be held at a higher potential than the anode to operate in Zener breakdown mode. When used as a shunt regulator, the cathode connects to the positive rail being regulated, and the anode connects to ground or the lower-potential reference point.

What is the thermal resistance specification for the 1N5348CE3/TR8?

The 1N5348CE3/TR8 has a junction-to-lead thermal resistance (R_θJL) of 25 °C/W when measured at 3/8″ (10 mm) lead length from the body. This low value enables effective heat transfer to PCB copper pours or external heatsinks - critical for sustaining its full 5 W power dissipation at elevated ambient temperatures.

1N5348CE3/TR8 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

1N5348CE3/TR8 FAQ

1.How can I place an order for 1N5348CE3/TR8 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5348CE3/TR8 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 1N5348CE3/TR8 reliable?

The price and inventory of 1N5348CE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5348CE3/TR8 is usually 5 days.

3.What payment methods are accepted for 1N5348CE3/TR8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5348CE3/TR8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5348CE3/TR8?

1N5348CE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5348CE3/TR8 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 1N5348CE3/TR8?

For technical support, including 1N5348CE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5348CE3/TR8 requirements.

6.How does Aetrix verify that 1N5348CE3/TR8 is sourced from the original manufacturer or authorized distributors?

All 1N5348CE3/TR8 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 1N5348CE3/TR8 meets industry standards.

7.What is the process for return or replacement of 1N5348CE3/TR8?

All 1N5348CE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5348CE3/TR8, 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 1N5348CE3/TR8 part is unused and in its original packaging.

Return procedure for 1N5348CE3/TR8:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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