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Microchip Technology 1N5346BE3/TR12
- Part No.:
- 1N5346BE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5346BE3/TR12.pdf
- Description:
- DIODE ZENER 9.1V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,341
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Product details
Overview
1N5346BE3/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 9.1 V ±5%, dynamic impedance of 2.0 Ω at 150 mA test current, maximum reverse current of 7.5 μA at 6.9 V, and thermal resistance of 25 °C/W (junction-to-lead). It regulates voltage in power supply feedback loops, overvoltage protection circuits, and reference voltage generation for industrial power converters.
For engineers reviewing the 1N5346BE3/TR12 datasheet, 1N5346BE3/TR12 pinout, 1N5346BE3/TR12 application, or 1N5346BE3/TR12 equivalent, key selection criteria include Zener voltage tolerance, surge current rating (IZSM = 9.2 A), power derating behavior above 25 °C, and RoHS-compliant matte-tin lead plating per MIL-STD-750.
Technical Context
This device operates as a voltage reference by maintaining a stable reverse-biased breakdown voltage across its cathode–anode terminals under controlled current conditions. Its 9.1 V nominal Zener voltage is specified at 150 mA (IZT), with voltage regulation (ΔVZ) of 0.22 V between 10% and 50% of IZM.
The 1N5346BE3/TR12 exhibits low dynamic impedance (2.0 Ω) and tight ±5% tolerance (B suffix), enabling precise regulation in analog feedback paths. Its 25 °C/W junction-to-lead thermal resistance supports stable operation up to 150 °C when mounted with ≥10 mm lead length from body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±5% at 150 mA - defines stable regulation point for feedback networks |
| Power Dissipation | 5.0 W at TL = 25 °C - requires heat sinking above ambient for full-power operation |
| Dynamic Impedance (ZZ) | 2.0 Ω at IZT = 150 mA - ensures minimal output voltage variation under load transients |
| Max Reverse Current (IR) | 7.5 μA at VR = 6.9 V - guarantees low leakage in high-impedance reference nodes |
| Surge Current (IZSM) | 9.2 A (8.3 ms half-sine) - withstands transient overvoltage events without failure |
| Thermal Resistance | 25 °C/W junction-to-lead - enables predictable temperature rise with defined lead length |
| Operating Temperature | −65 °C to +150 °C - suitable for industrial and automotive under-hood environments |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by band. Leads are annealed matte-tin plated per MIL-STD-750, solderable at 260 °C for 10 s.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Current entry terminal in forward bias; reference ground node in Zener mode | Connected to system ground or low-side return path in shunt regulator topologies |
| Cathode (banded end) | Current exit terminal in forward bias; regulated voltage node in reverse bias | Provides stable 9.1 V output referenced to anode; polarity must be observed to avoid forward conduction |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance (B suffix) | Enables accurate voltage setting without post-calibration in fixed-output supplies |
| RoHS-compliant e3 marking | Meets EU Directive 2011/65/EU with matte-tin lead finish and halogen-free epoxy |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints during assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for ESD-protected workstations |
| High surge current capability (9.2 A) | Protects downstream circuitry against line transients without external crowbar devices |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converter feedback loop via optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 9.1 V threshold for error signal generation. Use Value: Maintains ±1% output regulation across line/load/temperature with <0.22 V ΔVZ drift. |
Use Scenario: Clamps 12 V rail during load dump or inductive kickback in automotive control modules. IC Role / Device Role / Timing Role: Passive overvoltage protector diverting excess energy to ground before IC damage occurs. Use Value: Absorbs 9.2 A surge (8.3 ms) without degradation, preserving downstream MCU and sensor interfaces. |
| Precision Reference Generator | Industrial Sensor Excitation |
Use Scenario: Generates stable excitation voltage for 4–20 mA transmitter bridge sensors in process instrumentation. IC Role / Device Role / Timing Role: Low-drift Zener reference replacing higher-cost IC references where 5% tolerance suffices. Use Value: Delivers 9.1 V ±5% with 2.0 Ω dynamic impedance, minimizing sensor output error from supply ripple. |
Use Scenario: Supplies regulated bias voltage to RTD or thermistor measurement circuits in PLC analog input modules. IC Role / Device Role / Timing Role: Fixed-voltage source stabilizing Wheatstone bridge excitation under varying ambient temperatures. Use Value: Operates reliably from −65 °C to +150 °C with <7.5 μA leakage at 6.9 V, ensuring low offset drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5346B (non-e3, non-TR) | Same electrical specs; lead finish is tin-lead (not RoHS-compliant); supplied in bulk, not tape-and-reel | Not suitable for RoHS-compliant production; requires different packaging logistics | Select 1N5346BE3/TR12 for automated SMT placement and environmental compliance. |
| MMSZ5240B-TP (Micro Commercial Components) | Surface-mount SOD-123 package; 10 V ±5%; 500 mW rating; 17 Ω dynamic impedance at 20 mA | Limited to low-power applications; unsuitable for 5 W dissipation or surge clamping | Choose MMSZ5240B-TP only for space-constrained PCBs where power and surge requirements are ≤0.5 W. |
Compared with 1N5346B and MMSZ5240B-TP, the 1N5346BE3/TR12 uniquely combines 5 W power handling, 9.2 A surge capability, RoHS compliance, and tape-and-reel packaging-making it optimal for high-reliability industrial power regulation where axial mounting and thermal robustness are required.
Availability
1N5346BE3/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and programmable logic controller (PLC) analog input stages requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N5346BE3/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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was designed as a ruggedized, high-power Zener family for voltage regulation and transient suppression in harsh-environment power systems where thermal stability and surge resilience are critical.
FAQ
What is the Zener voltage tolerance of the 1N5346BE3/TR12?
The 1N5346BE3/TR12 has a Zener voltage tolerance of ±5%, indicated by the "B" suffix in its part number. This means its measured breakdown voltage falls within 8.65 V to 9.55 V at 150 mA test current and 25 °C lead temperature. The tolerance is guaranteed across the full operating temperature range of −65 °C to +150 °C, making the 1N5346BE3/TR12 suitable for precision regulation where moderate accuracy suffices without trimming.
Does the 1N5346BE3/TR12 require dry packing before PCB assembly?
No, the 1N5346BE3/TR12 does not require dry packing. It carries IPC/JEDEC J-STD-020B moisture sensitivity Level 1 classification, meaning it can be stored indefinitely at ambient conditions without desiccant or dry cabinet. This eliminates floor-life tracking and baking steps prior to reflow, simplifying manufacturing for high-volume industrial PCB assembly lines using the 1N5346BE3/TR12.
What is the maximum steady-state power dissipation of the 1N5346BE3/TR12 on a standard FR4 board?
The 1N5346BE3/TR12 delivers 1.47 W steady-state power dissipation when mounted on a standard FR4 PCB (1 oz copper) with 4 mm² copper pads and 1 mm track width over 25 mm length. This value derives from its 85 °C/W junction-to-ambient thermal resistance under those conditions. For full 5 W operation, the 1N5346BE3/TR12 must be used with ≥10 mm lead length from body to achieve the rated 25 °C/W junction-to-lead thermal resistance.
Can the 1N5346BE3/TR12 be used as a direct replacement for the legacy 1N5346B?
Yes, the 1N5346BE3/TR12 is functionally and electrically identical to the 1N5346B, with identical Zener voltage, dynamic impedance, and thermal characteristics. The "e3" suffix denotes RoHS-compliant matte-tin plating, and "TR12" indicates EIA-296 tape-and-reel packaging. No PCB layout changes are needed-only process validation for lead-free soldering is required when migrating from tin-lead 1N5346B to 1N5346BE3/TR12.
What is the surge current rating of the 1N5346BE3/TR12 and how is it defined?
The 1N5346BE3/TR12 has a peak non-recurrent surge current (IZSM) rating of 9.2 A, defined as the maximum amplitude of an 8.3 ms half-sine waveform. This rating reflects its ability to absorb transient energy without parametric shift or catastrophic failure. The surge capability is validated per JEDEC standards and makes the 1N5346BE3/TR12 appropriate for clamping inductive switch-off spikes and automotive load-dump events where short-duration overcurrents occur.
1N5346BE3/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):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 6.6 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
1N5346BE3/TR12 FAQ
1.How can I place an order for 1N5346BE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5346BE3/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 1N5346BE3/TR12 reliable?
The price and inventory of 1N5346BE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5346BE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5346BE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5346BE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5346BE3/TR12?
1N5346BE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5346BE3/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 1N5346BE3/TR12?
For technical support, including 1N5346BE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5346BE3/TR12 requirements.
6.How does Aetrix verify that 1N5346BE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5346BE3/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 1N5346BE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5346BE3/TR12?
All 1N5346BE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5346BE3/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 1N5346BE3/TR12 part is unused and in its original packaging.
Return procedure for 1N5346BE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5346BE3/TR12 Tags
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BZX84C3V3LT1G
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MM5Z5V1ST1G
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