My Inquiry
My Account
Microchip Technology 1N5349BE3/TR8
- Part No.:
- 1N5349BE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5349BE3/TR8.pdf
- Description:
- DIODE ZENER 12V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,187
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5349BE3/TR8 from Microsemi is a 12 V, ±5% tolerance, 5 W axial-leaded silicon Zener diode optimized for voltage regulation in power supply feedback loops, overvoltage protection circuits, and precision reference applications. It delivers 100 mA maximum Zener current (IZM), exhibits 2.5 Ω dynamic impedance (ZZ) at 100 mA test current, and operates across –65°C to +150°C.
For engineers reviewing the 1N5349BE3/TR8 datasheet, 1N5349BE3/TR8 pinout, 1N5349BE3/TR8 application, or 1N5349BE3/TR8 equivalent, key selection criteria include its 12 V nominal Zener voltage, 5 W steady-state power rating at 25°C lead temperature, low 2.5 Ω dynamic impedance, RoHS-compliant matte-tin plating, and T-18 axial package with cathode band polarity marking.
Technical Context
This device functions as a two-terminal voltage reference by operating in reverse breakdown, maintaining stable output voltage across a wide current range (1 mA to 100 mA). Its 2.5 Ω dynamic impedance ensures minimal voltage deviation under load transients, while the 25 °C/W junction-to-lead thermal resistance enables reliable 5 W dissipation with standard 3/8″ lead length heat sinking.
The 1N5349BE3/TR8 is rated for 2.0 μA maximum reverse leakage at 9.1 V (VR), exhibits 0.25 V voltage regulation (ΔVZ) between 10% and 50% of IZM, and withstands 18.7 A non-repetitive surge current (8.3 ms half-sine) - confirming suitability for transient suppression in DC power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12.0 V ±5% at 100 mA test current - defines precise regulation point for feedback or clamping |
| Power Dissipation | 5.0 W at TL = 25°C (3/8″ lead length) - sets maximum continuous DC power handling with basic heatsinking |
| Dynamic Impedance (ZZ) | 2.5 Ω at IZT = 100 mA - determines output voltage stability under varying load current |
| Max Reverse Leakage (IR) | 2.0 μA at VR = 9.1 V - ensures low standby power loss in high-impedance bias networks |
| Thermal Resistance | 25 °C/W junction-to-lead - enables thermal design using standard axial-lead PCB mounting |
| Surge Current (IZSM) | 18.7 A (8.3 ms half-sine) - supports transient overvoltage suppression without failure |
| Operating Temperature | –65°C to +150°C - validated for industrial, automotive under-hood, and aerospace environments |
Pinout & Package
Package: T-18 axial-leaded plastic case (Void-free UL94V-0 epoxy), 0.7 g weight, cathode indicated by colored band. Leads are RoHS-compliant annealed matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased reference terminal | Connected to lower-potential node in Zener configuration; carries full regulated current |
| Cathode | Reference output terminal | Banded end; held at stable VZ above anode; used for feedback sensing or clamping node |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 5 W Zener | Industry-standard compliance ensures interchangeability and qualification traceability |
| ±5% voltage tolerance (B suffix) | Reduces calibration overhead in mid-precision power supply designs |
| RoHS-compliant (e3 suffix) | Meets global environmental directives without performance trade-offs |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints for SMT assembly prep |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables handling without special static control in production and repair environments |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converters via optocoupler feedback network. IC Role / Device Role / Timing Role: Primary-side voltage reference establishing error amplifier setpoint. Use Value: 12 V nominal Zener voltage and 2.5 Ω dynamic impedance ensure tight output regulation (<±1%) across line/load variations. |
Use Scenario: Clamping 12 V rail against transient spikes exceeding 15 V during load dump or inductive switching. IC Role / Device Role / Timing Role: Two-terminal shunt protector diverting excess energy to ground when voltage exceeds VZ. Use Value: 18.7 A surge rating and 5 W steady-state dissipation enable single-device protection without external current limiting. |
| Precision Reference for Analog Circuits | Industrial Sensor Excitation |
Use Scenario: Providing stable 12 V excitation for bridge-based pressure or strain sensors in data acquisition modules. IC Role / Device Role / Timing Role: Low-drift DC reference source replacing higher-cost IC references where ±5% tolerance is acceptable. Use Value: 0.25 V voltage regulation (ΔVZ) and <2.0 μA leakage minimize sensor offset drift and power consumption. |
Use Scenario: Biasing 4–20 mA transmitter front-ends requiring stable supply in harsh factory environments. IC Role / Device Role / Timing Role: Local regulation stage isolating sensitive analog circuitry from noisy 24 V plant bus. Use Value: –65°C to +150°C operating range and MIL-qualified screening options support deployment in uncontrolled enclosures. |
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 | No e3/RoHS suffix; tin-lead plating; same electrical specs and T-18 package | Not compliant with EU RoHS Directive 2011/65/EU or China RoHS II | Select when legacy tin-lead assembly or exemption-based compliance is required |
| MMSZ5242B-TP | Surface-mount SOD-123 package; 12 V ±5%; 500 mW power rating; 10 Ω Zz | Limited to low-power bias/reference use; unsuitable for 5 W dissipation or surge clamping | Choose only for space-constrained PCBs where thermal and surge requirements are relaxed |
Compared with 1N5349BE3/TR8, the 1N5349B offers identical regulation performance but lacks RoHS compliance, while MMSZ5242B-TP provides footprint reduction at the cost of 90% lower power handling and degraded dynamic impedance - making the 1N5349BE3/TR8 the sole option for robust 5 W axial Zener applications.
Availability
1N5349BE3/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and industrial sensor excitation systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N5349BE3/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 series was designed as a JEDEC-standardized, high-power axial Zener platform delivering stable voltage regulation from 3.3 V to 200 V with military-grade screening options and broad thermal capability.
FAQ
What is the Zener voltage tolerance of the 1N5349BE3/TR8?
The 1N5349BE3/TR8 has a nominal Zener voltage of 12.0 V with a tolerance of ±5%, as indicated by the "B" suffix in the part number. This tolerance is specified at 25°C lead temperature with 100 mA test current (IZT), and applies across the full operating temperature range of –65°C to +150°C per Microsemi's published electrical characteristics table.
Can the 1N5349BE3/TR8 be used in surface-mount designs?
No - the 1N5349BE3/TR8 uses a T-18 axial-leaded package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5349B (DO-214AA) and SMBG5349B (DO-214AB) variants, which share the same 12 V ±5% regulation but differ in thermal performance and surge capability.
What is the maximum steady-state current the 1N5349BE3/TR8 can handle?
The 1N5349BE3/TR8 supports a maximum Zener current (IZM) of 100 mA at 25°C lead temperature, corresponding to its 5.0 W power rating. At ambient temperature on FR4 board (1 oz Cu, 4 mm² pad), its derated steady-state power drops to 1.47 W, limiting usable current to approximately 122 mA at 12 V - but thermal design must verify junction temperature remains within –65°C to +150°C limits.
Does the 1N5349BE3/TR8 require dry packing before reflow soldering?
No - the 1N5349BE3/TR8 has IPC/JEDEC J-STD-020B moisture sensitivity level (MSL) 1, meaning it is not hygroscopic and requires no dry pack, baking, or floor-life controls prior to soldering. It withstands standard 260°C for 10 s reflow profiles per MIL-STD-750 Method 2026.
How does the dynamic impedance of the 1N5349BE3/TR8 affect regulation accuracy?
The 1N5349BE3/TR8 specifies 2.5 Ω dynamic impedance (ZZ) at 100 mA test current. This value directly determines how much the Zener voltage shifts with load current changes: a 10 mA change causes ~25 mV shift. Combined with its 0.25 V voltage regulation (ΔVZ) between 10% and 50% of IZM, this ensures predictable, low-drift behavior in feedback and reference applications.
1N5349BE3/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:
- ±5%
- 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
1N5349BE3/TR8 FAQ
1.How can I place an order for 1N5349BE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5349BE3/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 1N5349BE3/TR8 reliable?
The price and inventory of 1N5349BE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5349BE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5349BE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5349BE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5349BE3/TR8?
1N5349BE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5349BE3/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 1N5349BE3/TR8?
For technical support, including 1N5349BE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5349BE3/TR8 requirements.
6.How does Aetrix verify that 1N5349BE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5349BE3/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 1N5349BE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5349BE3/TR8?
All 1N5349BE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5349BE3/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 1N5349BE3/TR8 part is unused and in its original packaging.
Return procedure for 1N5349BE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5349BE3/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…
