My Inquiry
My Account
Microchip Technology 1N5349CE3/TR8
- Part No.:
- 1N5349CE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5349CE3/TR8.pdf
- Description:
- DIODE ZENER 12V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,056
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5349CE3/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 12 V, ±2% tolerance (C suffix), 2.5 Ω maximum dynamic impedance at 100 mA test current, and 750 mA maximum Zener current when adequately heat-sunk. It operates across –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in industrial power supplies.
For engineers reviewing the 1N5349CE3/TR8 datasheet, 1N5349CE3/TR8 pinout, 1N5349CE3/TR8 application, or 1N5349CE3/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (18.7 A), reverse leakage at VR = 9.1 V, and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage regulator in reverse-biased mode, maintaining stable output voltage under varying load and line conditions. Its low dynamic impedance (2.5 Ω) and tight ±2% VZ tolerance ensure minimal voltage drift across operating current (100 mA IZT) and temperature.
The 1N5349CE3/TR8 uses a void-free thermosetting epoxy T-18 package with cathode band polarity marking and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity-no dry pack required. It withstands 8.3 ms half-sine surge currents up to 18.7 A and exhibits <0.25 V voltage regulation (ΔVZ) between 10% and 50% of IZM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±2% at 100 mA - ensures precise reference stability for feedback loops in regulated DC-DC converters |
| Power Dissipation | 5.0 W at TL = 25 °C (3/8″ lead length) - requires minimal heatsinking in medium-power applications |
| Dynamic Impedance (ZZ) | 2.5 Ω max at IZT = 100 mA - minimizes output voltage variation under dynamic load changes |
| Max Reverse Current (IR) | 2.0 µA max at VR = 9.1 V - guarantees low standby power loss in high-impedance bias networks |
| Thermal Resistance | 25 °C/W junction-to-lead - enables predictable thermal design with standard PCB copper pads |
| Surge Current (IZSM) | 18.7 A peak (8.3 ms half-sine) - provides robust transient overvoltage clamping without failure |
| Operating Temperature | –65 °C to +150 °C - supports deployment in automotive engine compartments and industrial motor drives |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by colored band. Leads are annealed matte-tin plated (RoHS-compliant, solderable per MIL-STD-750 Method 2026).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; reverse bias applied to cathode for regulation |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; connected to unregulated input rail; delivers stable 12 V to load or feedback network |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables tighter closed-loop regulation without external trimming in precision analog power supplies |
| RoHS-compliant e3 suffix | Meets global environmental compliance requirements without sacrificing electrical performance or reliability |
| Level 1 moisture sensitivity | Eliminates bake-out requirement before reflow, reducing manufacturing cost and handling risk |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces need for special ESD handling during assembly and field service |
| High surge current capability (18.7 A) | Provides single-device transient voltage suppression in 24 V industrial control inputs |
Applications
| Industrial Power Supply Reference | Overvoltage Clamp for PLC Inputs |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated 24 V DC-DC converter secondary side. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing error amplifier input reference. Use Value: ±2% VZ tolerance and 2.5 Ω ZZ maintain output regulation within ±1.5% across 10–100% load range. |
Use Scenario: Protecting 24 V digital input circuitry against induced transients on factory floor wiring. IC Role / Device Role / Timing Role: Passive clamp limiting voltage to 12 V during surge events. Use Value: 18.7 A 8.3 ms surge rating absorbs IEC 61000-4-5 Level 3 surges without degradation. |
| Automotive Engine Control Sensor Bias | Test Equipment Voltage Calibration Standard |
Use Scenario: Providing stable 12 V bias to pressure and temperature sensors in engine bay environments. IC Role / Device Role / Timing Role: Precision shunt regulator compensating for supply ripple and thermal drift. Use Value: Operation from –65 °C to +150 °C and <0.25 V ΔVZ ensure sensor accuracy across full automotive thermal range. |
Use Scenario: Serving as traceable 12 V reference in benchtop multimeter calibration fixtures. IC Role / Device Role / Timing Role: Primary voltage standard with metrology-grade repeatability. Use Value: Tight ±2% tolerance and low 2.5 Ω ZZ enable sub-0.1% measurement uncertainty in 4-wire Kelvin setups. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5349B | ±5% VZ tolerance (B suffix), same VZ, IZT, ZZ, and package | Lower precision; suitable where cost outweighs regulation accuracy | Select 1N5349B only if ±5% output tolerance is acceptable in the target feedback loop |
| MMSZ5242ET1G | Surface-mount SOD-123 package, 500 mW rating, ±5% VZ, 12 V nominal | Not drop-in; requires PCB redesign; limited surge capability (1.5 A) | Choose MMSZ5242ET1G only for space-constrained, low-power, automated assembly applications |
Compared with 1N5349B and MMSZ5242ET1G, the 1N5349CE3/TR8 delivers superior precision (±2% vs ±5%), higher power handling (5 W vs 0.5 W), and robust surge immunity (18.7 A vs 1.5 A), making it optimal for industrial and automotive systems demanding long-term stability and ruggedness.
Availability
1N5349CE3/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, PLC input protection circuits, and automotive sensor bias networks requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for 1N5349CE3/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 1N53xxB series was designed for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and long-term parametric stability under extended temperature cycling.
FAQ
What is the Zener voltage tolerance of the 1N5349CE3/TR8?
The 1N5349CE3/TR8 has a Zener voltage tolerance of ±2%, indicated by the "C" suffix in its part number. This means its measured VZ falls within 11.76 V to 12.24 V at 100 mA test current and 25 °C lead temperature. This tighter tolerance supports higher-accuracy voltage references compared to ±5% (B suffix) or ±10% (A suffix) variants in the same family.
Does the 1N5349CE3/TR8 require dry packing before reflow soldering?
No, the 1N5349CE3/TR8 has IPC/JEDEC J-STD-020B Level 1 moisture sensitivity, meaning it is not moisture-sensitive and does not require dry packing or baking prior to reflow. Its void-free epoxy T-18 package inherently prevents moisture ingress, simplifying manufacturing handling and reducing process risk.
What is the maximum surge current rating for the 1N5349CE3/TR8?
The 1N5349CE3/TR8 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 without parametric shift or failure, making it suitable for clamping inductive switch-off spikes in relay drivers and solenoid controls.
How does the thermal resistance of the 1N5349CE3/TR8 affect PCB layout?
The 1N5349CE3/TR8 has a junction-to-lead thermal resistance of 25 °C/W when mounted with 3/8″ (10 mm) lead length from body. To maintain safe junction temperature, PCB traces connected to its leads should use ≥1 mm width and connect to ≥4 mm² copper pads. No additional heatsink is needed for ≤5 W continuous dissipation under these conditions.
Is the 1N5349CE3/TR8 compatible with lead-free reflow processes?
Yes, the 1N5349CE3/TR8 features RoHS-compliant matte-tin plating (e3 suffix) and is qualified for lead-free reflow with peak temperatures up to 260 °C for 10 seconds, per MIL-STD-750 Method 2026. Its UL94V-0 epoxy body remains stable under standard JEDEC J-STD-020 profile conditions.
1N5349CE3/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):
- 12 V
- Tolerance:
- ±2%
- 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
1N5349CE3/TR8 FAQ
1.How can I place an order for 1N5349CE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5349CE3/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 1N5349CE3/TR8 reliable?
The price and inventory of 1N5349CE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5349CE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5349CE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5349CE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5349CE3/TR8?
1N5349CE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5349CE3/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 1N5349CE3/TR8?
For technical support, including 1N5349CE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5349CE3/TR8 requirements.
6.How does Aetrix verify that 1N5349CE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5349CE3/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 1N5349CE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5349CE3/TR8?
All 1N5349CE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5349CE3/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 1N5349CE3/TR8 part is unused and in its original packaging.
Return procedure for 1N5349CE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5349CE3/TR8 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
