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Microchip Technology 1N5346B/TR12
- Part No.:
- 1N5346B/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5346B/TR12.pdf
- Description:
- DIODE ZENER 9.1V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:9,209
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Product details
Overview
1N5346B/TR12 from Microsemi is a 5.0 W axial-leaded silicon Zener diode with nominal regulation voltage of 9.1 V ±5%, 150 mA test current (IZT), 2.0 Ω maximum dynamic impedance (ZZ), and 7.5 μA maximum reverse leakage at 6.9 V. 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 1N5346B/TR12 datasheet, 1N5346B/TR12 pinout, 1N5346B/TR12 application, or 1N5346B/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (520 A), voltage regulation (ΔVZ = 0.22 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This discrete Zener diode functions as a two-terminal voltage regulator in reverse-biased mode, maintaining stable output voltage across wide operating current (150 mA IZT up to 520 A non-repetitive surge) and temperature ranges. Its low dynamic impedance (2.0 Ω) and tight ±5% tolerance ensure minimal voltage drift under load variation.
The device uses a void-free thermosetting epoxy T-18 package with cathode band marking, rated for 5.0 W steady-state dissipation at 25°C lead temperature (3/8″ from body), and exhibits 0.22 V voltage regulation (ΔVZ) between 10% and 50% of IZM - confirming high regulation fidelity for analog reference applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±5% - defines precise clamping threshold for feedback or protection circuits |
| Test Current (IZT) | 150 mA - operating point where VZ and ZZ are specified; sets minimum bias requirement |
| Dynamic Impedance (ZZ) | 2.0 Ω max - ensures low AC voltage variation under changing load currents |
| Max Reverse Leakage (IR) | 7.5 μA at VR = 6.9 V - guarantees low standby power loss in high-impedance bias networks |
| Power Dissipation (Pd) | 5.0 W at TL = 25°C - supports robust regulation in compact, heatsink-limited designs |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables thermal design using lead length as primary heat path |
| Voltage Regulation (ΔVZ) | 0.22 V - difference between VZ measured at 10% and 50% of IZM; quantifies line regulation performance |
Pinout & Package
Package: Axial-leaded T-18 plastic encapsulated case with cathode indicated by color band; moisture sensitivity level 1 (no dry pack required); RoHS-compliant matte-tin plating; weight 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower-potential node; carries forward current up to 1.0 A (VF ≤ 1.2 V) |
| Cathode | Zener regulation terminal / Voltage clamp node | Banded end; connected to regulated rail; reverse-biased to maintain 9.1 V reference under load |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures industry-standard mechanical and electrical interchangeability across manufacturers |
| ±5% voltage tolerance (B suffix) | Reduces calibration overhead in mid-precision analog references versus ±10% or ±20% variants |
| Low dynamic impedance (2.0 Ω) | Minimizes output voltage deviation during transient load changes in feedback paths |
| High surge current rating (520 A) | Withstands 8.3 ms half-sine transients without degradation-critical for input-stage protection |
| MIL-STD-750 ESD robustness | Nonsensitive to electrostatic discharge, eliminating need for external ESD protection in handling |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Provides stable 9.1 V reference for optocoupler-based feedback in isolated DC-DC converters. IC Role / Device Role / Timing Role: Zener diode acting as precision shunt reference in secondary-side regulation loop. Use Value: Tight ±5% tolerance and low ΔVZ (0.22 V) ensure consistent output voltage regulation across line/load variations. | Use Scenario: Supplies excitation voltage to bridge-based pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Stable shunt reference establishing known bias point for ratiometric sensor signal conditioning. Use Value: Low IR (7.5 μA) prevents loading error in high-impedance sensor bridges; 150°C max operating temp supports harsh environments. |
| Overvoltage Clamp Protection | Programmable Logic Controller Input Protection |
Use Scenario: Clamps transient spikes on 12 V rail in automotive body control modules. IC Role / Device Role / Timing Role: Shunt protector diverting surge energy above 9.1 V to ground before downstream ICs are damaged. Use Value: 520 A peak surge rating handles ISO 7637-2 pulse 5a; 25 °C/W RθJL allows direct PCB lead conduction cooling. | Use Scenario: Protects 24 V digital input channels in PLC backplanes against field-wiring faults. IC Role / Device Role / Timing Role: Primary overvoltage limiter placed ahead of opto-isolator input stage. Use Value: Axial T-18 package enables through-hole mounting with mechanical strain relief; RoHS-compliant plating meets industrial compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5346B (bulk) | Identical electrical specs; differs only in packaging (TR12 = tape-and-reel, bulk has no reel) | No functional difference; TR12 enables automated SMT placement; bulk suits manual prototyping or repair | Select 1N5346B/TR12 for production lines requiring pick-and-place compatibility |
| MMBZ5240B (SOT-23) | Same 9.1 V ±5% rating but 0.35 W power; surface-mount; higher ZZ (15 Ω); lower IZM (65 mA) | Not suitable for 5 W regulation; limited to low-power bias/reference; requires PCB real estate optimization | Choose MMBZ5240B only when board space constraints prohibit axial leads and power demand is ≤350 mW |
Compared with 1N5346B/TR12, the bulk variant offers identical performance with manual handling flexibility, while MMBZ5240B trades power capability and thermal robustness for miniaturization - making 1N5346B/TR12 optimal for high-reliability 5 W regulation where leaded mounting and surge resilience are required.
Availability
1N5346B/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, overvoltage protection circuits, and programmable logic controller input stages requiring stable component supply and JEDEC-standard interchangeability.
Supply support for 1N5346B/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 platform for mission-critical voltage regulation and transient suppression where thermal stability, surge immunity, and long-term parametric consistency are essential.
FAQ
What is the Zener voltage tolerance for 1N5346B/TR12?
The 1N5346B/TR12 has a nominal Zener voltage of 9.1 V with a tolerance of ±5%, as indicated by the "B" suffix per Microsemi's documentation. This tolerance applies at 25°C lead temperature with 150 mA test current and ensures predictable clamping behavior in production-grade power regulation circuits without requiring post-manufacture trimming.
Does 1N5346B/TR12 require dry-pack moisture protection?
No, the 1N5346B/TR12 has a moisture sensitivity level (MSL) of 1 per IPC/JEDEC J-STD-020B, meaning it is not moisture-sensitive and does not require dry-packaging or baking prior to assembly. Its void-free thermosetting epoxy T-18 package provides inherent humidity resistance for standard storage and reflow conditions.
What is the maximum surge current rating for 1N5346B/TR12?
The 1N5346B/TR12 is rated for a maximum non-repetitive surge current (IZSM) of 520 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating reflects its ability to absorb transient energy in overvoltage protection applications without parametric shift or failure, provided the device is properly mounted with adequate lead thermal conduction.
How does the thermal resistance of 1N5346B/TR12 affect PCB layout?
The 1N5346B/TR12 has a junction-to-lead thermal resistance (RθJL) of 25 °C/W at 3/8″ (10 mm) lead length from the body. For optimal thermal performance, PCB traces connected to its leads should be wide and short, and copper pour near solder joints improves heat spreading. Mounting directly to a metal chassis via leads further enhances dissipation beyond the 5.0 W rating.
Is 1N5346B/TR12 RoHS compliant?
Yes, the 1N5346B/TR12 is RoHS compliant, as confirmed by the "e3" suffix in Microsemi's official documentation. Its terminals feature annealed matte-tin plating that meets RoHS Directive 2011/65/EU requirements, and the void-free epoxy body complies with UL94V-0 flammability standards - supporting environmentally regulated industrial and commercial deployments.
1N5346B/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
1N5346B/TR12 FAQ
1.How can I place an order for 1N5346B/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5346B/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 1N5346B/TR12 reliable?
The price and inventory of 1N5346B/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5346B/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5346B/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5346B/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5346B/TR12?
1N5346B/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5346B/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 1N5346B/TR12?
For technical support, including 1N5346B/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5346B/TR12 requirements.
6.How does Aetrix verify that 1N5346B/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5346B/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 1N5346B/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5346B/TR12?
All 1N5346B/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5346B/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 1N5346B/TR12 part is unused and in its original packaging.
Return procedure for 1N5346B/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5346B/TR12 Tags
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MM5Z5V1ST1G
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