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

Microchip Technology 1N5348E3/TR8

Name: 1N5348E3/TR8
Brand: Microchip Technology
SKU: 1N5348E3/TR8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5348E3/TR8

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: T-18, Axial

Datasheet:: 1N5348E3/TR8.pdf

Description:: DIODE ZENER 11V 5W T18

Quantity:: RFQ Add To RFQ list

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Inventory:2,638

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Product details

Overview

1N5348E3/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 11 V, ±5% tolerance (B-suffix equivalent), 125 mA maximum Zener current (IZM), 2.5 Ω dynamic impedance (ZZ), and 0.25 V voltage regulation (ΔVZ). It operates from −65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in power supply feedback loops.

For engineers reviewing the 1N5348E3/TR8 datasheet, 1N5348E3/TR8 pinout, 1N5348E3/TR8 application, or 1N5348E3/TR8 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (8.0 A), RoHS compliance (e3 suffix), and tape-and-reel packaging (TR8 suffix).

Technical Context

This device functions as a two-terminal voltage regulator in reverse-biased mode, maintaining stable output voltage across wide current variation (125 mA IZM at TL = 25 °C). Its low dynamic impedance (2.5 Ω) and tight voltage regulation (ΔVZ = 0.25 V) ensure minimal deviation between 10% and 50% of IZM.

The 1N5348E3/TR8 uses a void-free thermosetting epoxy T-18 package with tin-lead or RoHS-compliant matte-tin plating, rated for 260 °C soldering (10 s), and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity without dry pack requirement.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	11 V nominal, ±5% tolerance - defines precise clamping threshold in regulation circuits
Power Dissipation	5.0 W at 25 °C lead temperature - requires minimum 3/8″ (10 mm) lead length for full rating
Max Zener Current (I_ZM)	125 mA - maximum continuous DC current before thermal runaway under heatsink conditions
Dynamic Impedance (Z_Z)	2.5 Ω - low AC resistance ensures stable voltage under varying load currents
Voltage Regulation (ΔV_Z)	0.25 V - difference between V_Z measured at 10% and 50% of I_ZM, indicating regulation linearity
Surge Current (I_ZSM)	8.0 A peak (8.3 ms half-sine) - supports transient overvoltage suppression without failure
Thermal Resistance	25 °C/W junction-to-lead - enables predictable thermal design when leads serve as heat path

Pinout & Package

T-18 axial-leaded plastic package with cathode band marking; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026. Polarity: banded end is cathode (must be biased positive relative to anode for Zener operation).

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener reference ground node	Connected to circuit ground or lower-potential rail; carries forward current up to 1.0 A (V_F ≤ 1.2 V)
Cathode	Zener regulation terminal / voltage clamp output	Banded end; connected to regulated node; reverse-biased to maintain 11 V reference under load

Key Features

Feature	Design Value
RoHS-compliant construction	e3 suffix confirms lead-free matte-tin plating and halogen-free epoxy, compliant with EU Directive 2011/65/EU
JEDEC-registered Zener series	1N53xxB family qualification ensures standardized electrical behavior and interchangeability across manufacturers
Level 1 moisture sensitivity	No dry pack required prior to assembly - reduces handling cost and avoids bake-out delays in SMT lines
High surge current capability	8.0 A non-recurrent surge rating enables robust protection against line transients without external TVS stacking
Stable regulation over temperature	Operates from −65 °C to +150 °C with minimal V_Z drift - suitable for automotive under-hood and industrial environments

Applications

Switch-Mode Power Supply Feedback	Overvoltage Protection Circuit
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler feedback loop. IC Role / Device Role / Timing Role: Zener reference element providing stable 11 V threshold to error amplifier input. Use Value: Enables ±1% output regulation accuracy by minimizing ΔV_Z drift across 0–125 mA operating range.	Use Scenario: Clamps rail voltage during load dump or inductive kick events in 12 V automotive systems. IC Role / Device Role / Timing Role: Two-terminal shunt protector absorbing transient energy above 11 V. Use Value: Withstands 8.0 A surge (8.3 ms) without degradation, eliminating need for parallel Zener strings.
Programmable Voltage Reference	Industrial Sensor Excitation
Use Scenario: Provides fixed bias voltage for op-amp-based instrumentation amplifiers in data acquisition modules. IC Role / Device Role / Timing Role: Precision DC reference source with low dynamic impedance for noise-sensitive analog stages. Use Value: 2.5 Ω Z_Z and 0.25 V ΔV_Z reduce output ripple and improve ADC effective resolution.	Use Scenario: Supplies stable excitation voltage to resistive bridge sensors (e.g., strain gauges) in factory automation PLCs. IC Role / Device Role / Timing Role: Low-drift voltage source maintaining constant sensor bias despite supply fluctuations. Use Value: −65 °C to +150 °C operating range ensures reliability in uncontrolled industrial enclosures.

Switch-Mode Power Supply Feedback

Overvoltage Protection Circuit

Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler feedback loop.

IC Role / Device Role / Timing Role: Zener reference element providing stable 11 V threshold to error amplifier input.

Use Value: Enables ±1% output regulation accuracy by minimizing ΔV_Z drift across 0–125 mA operating range.

Use Scenario: Clamps rail voltage during load dump or inductive kick events in 12 V automotive systems.

IC Role / Device Role / Timing Role: Two-terminal shunt protector absorbing transient energy above 11 V.

Use Value: Withstands 8.0 A surge (8.3 ms) without degradation, eliminating need for parallel Zener strings.

Programmable Voltage Reference

Industrial Sensor Excitation

Use Scenario: Provides fixed bias voltage for op-amp-based instrumentation amplifiers in data acquisition modules.

IC Role / Device Role / Timing Role: Precision DC reference source with low dynamic impedance for noise-sensitive analog stages.

Use Value: 2.5 Ω Z_Z and 0.25 V ΔV_Z reduce output ripple and improve ADC effective resolution.

Use Scenario: Supplies stable excitation voltage to resistive bridge sensors (e.g., strain gauges) in factory automation PLCs.

IC Role / Device Role / Timing Role: Low-drift voltage source maintaining constant sensor bias despite supply fluctuations.

Use Value: −65 °C to +150 °C operating range ensures reliability in uncontrolled industrial enclosures.

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, ±5%, 5 W rating but with tin-lead plating (non-RoHS); no TR8 tape-and-reel packaging	Not suitable for RoHS-compliant production; requires manual loading or different reel specification	Select 1N5348B only for legacy repair or non-RoHS programs where e3 compliance is not mandated
MMSZ5242B-TP	Surface-mount SOD-123 package; same 11 V, ±5%, but lower 500 mW power rating and 10 mA I_ZM	Limited to low-power signal-level regulation; cannot replace 1N5348E3/TR8 in 5 W power-stage roles	Choose MMSZ5242B-TP only for space-constrained PCBs where thermal dissipation < 0.5 W is sufficient

Compared with 1N5348B and MMSZ5242B-TP, the 1N5348E3/TR8 uniquely combines RoHS compliance, 5 W power handling, axial-leaded through-hole mounting, and tape-and-reel delivery-making it optimal for high-reliability industrial power supply manufacturing.

Availability

1N5348E3/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 1N5348E3/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, RF, and timing solutions for aerospace, defense, and industrial markets.

The 1N53xxB Zener series was designed for ruggedized voltage regulation in harsh-environment power systems-emphasizing thermal stability, surge resilience, and JEDEC-standardized interchangeability.

FAQ

What is the Zener voltage tolerance of the 1N5348E3/TR8?

The 1N5348E3/TR8 has a nominal Zener voltage of 11 V with ±5% tolerance, consistent with the B-suffix designation in the 1N53xxB family. This tolerance is confirmed in the Electrical Characteristics table on page 1 of the Microsemi datasheet, where 1N5348B (identical electrical spec) is listed with ±5% and the e3/TR8 variant retains that specification while adding RoHS compliance and tape-and-reel packaging.

Does the 1N5348E3/TR8 require dry packing before PCB assembly?

No, the 1N5348E3/TR8 does not require dry packing. Its moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1, meaning it can be stored indefinitely at ambient conditions without desiccant or baking. This is explicitly stated in the Features section of the Microsemi datasheet and applies to all 1N53xxB devices including the e3 variant.

What is the maximum surge current rating for the 1N5348E3/TR8?

The 1N5348E3/TR8 has a maximum non-recurrent surge current (I_ZSM) of 8.0 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating is specified in the Electrical Characteristics table and reflects the device's ability to absorb transient energy without parametric shift or catastrophic failure-critical for automotive and industrial overvoltage protection.

Can the 1N5348E3/TR8 be used in place of the 1N5348B in existing designs?

Yes, the 1N5348E3/TR8 is a direct functional replacement for the 1N5348B in most cases: identical Zener voltage (11 V), tolerance (±5%), power rating (5 W), and thermal characteristics. The e3 suffix adds RoHS compliance and TR8 tape-and-reel packaging; no PCB layout changes are needed, though solder profile must accommodate RoHS reflow temperatures.

What is the forward voltage drop of the 1N5348E3/TR8 at 1.0 A?

The forward voltage (V_F) of the 1N5348E3/TR8 is guaranteed ≤ 1.2 V at 1.0 A DC forward current, as specified in the Maximum Ratings table. This low V_F ensures minimal conduction loss when used in polarity-protection or crowbar configurations requiring forward conduction capability.

1N5348E3/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:: ±20%

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

1N5348E3/TR8 FAQ

1.How can I place an order for 1N5348E3/TR8 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5348E3/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 1N5348E3/TR8 reliable?

The price and inventory of 1N5348E3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5348E3/TR8 is usually 5 days.

3.What payment methods are accepted for 1N5348E3/TR8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5348E3/TR8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5348E3/TR8?

1N5348E3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5348E3/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 1N5348E3/TR8?

For technical support, including 1N5348E3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5348E3/TR8 requirements.

6.How does Aetrix verify that 1N5348E3/TR8 is sourced from the original manufacturer or authorized distributors?

All 1N5348E3/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 1N5348E3/TR8 meets industry standards.

7.What is the process for return or replacement of 1N5348E3/TR8?

All 1N5348E3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5348E3/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 1N5348E3/TR8 part is unused and in its original packaging.

Return procedure for 1N5348E3/TR8:

1.Submit a request within 90 days.

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

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