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Microchip Technology 1N5346A/TR12
- Part No.:
- 1N5346A/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5346A/TR12.pdf
- Description:
- DIODE ZENER 9.1V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:2,717
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Product details
Overview
1N5346A/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 9.1 V, ±10% tolerance (A suffix), 150 mA maximum Zener current (IZM), and 2.0 Ω maximum dynamic impedance (ZZ) at 150 mA test current. 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 1N5346A/TR12 datasheet, 1N5346A/TR12 pinout, 1N5346A/TR12 application, or 1N5346A/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (520 A), reverse leakage (7.5 µA @ 7.2 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 max) and temperature (–65 °C to +150 °C) ranges. Its low 25 °C/W thermal resistance enables high-power operation with minimal lead-length heat sinking (3/8″ from body).
It exhibits 0.22 V voltage regulation (ΔVZ) between 10% and 50% of IZM, confirming tight regulation stability. The device uses void-free UL94V-0 epoxy encapsulation with cathode band polarity marking and supports tape-and-reel packaging (TR12 suffix).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±10% - defines regulated output voltage under nominal bias; actual range: 8.19 V to 10.01 V |
| Test Current (IZT) | 150 mA - standard DC current at which VZ is measured; sets baseline operating point |
| Dynamic Impedance (ZZ) | 2.0 Ω max - low AC resistance ensures minimal voltage shift with load current changes |
| Max Reverse Leakage (IR) | 7.5 µA @ 7.2 V - confirms low off-state power loss in voltage-sensing circuits |
| Max Zener Current (IZM) | 520 mA - peak continuous DC current before thermal failure; requires adequate heatsinking |
| Surge Current (IZSM) | 520 A (8.3 ms half-sine) - withstands transient overvoltage events without degradation |
| Voltage Regulation (ΔVZ) | 0.22 V - difference between VZ at 10% and 50% of IZM; quantifies regulation linearity |
Pinout & Package
Package: Axial-leaded T-18 plastic case (JEDEC DO-201AD), void-free UL94V-0 epoxy body, matte-tin plated leads, cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower-potential rail; carries forward current up to 1.0 A |
| Cathode (banded end) | Zener regulation terminal / Output reference node | Connected to regulated voltage node; reverse-biased to maintain 9.1 V reference; polarity critical for function |
Key Features
| Feature | Design Value |
|---|---|
| ±10% Zener voltage tolerance (A suffix) | Enables cost-optimized voltage reference where tighter regulation is not required |
| 5.0 W steady-state power at 25 °C (3/8″ lead length) | Supports high-current regulation without external heatsink in compact layouts |
| Moisture sensitivity Level 1 (IPC/JEDEC J-STD-020B) | Eliminates dry-pack requirement and bake-out prior to assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for ESD-protected workstations |
| Tape-and-reel packaging (TR12 suffix) | Enables automated SMT placement compatibility despite axial-leaded form factor |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converter feedback path using optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Provides stable 9.1 V reference for TL431-like comparator input; replaces higher-cost IC references. Use Value: Maintains ±10% output accuracy across line/load/temperature with no active components or trimming. | Use Scenario: Supplies excitation voltage to bridge-based pressure transducers in factory automation systems. IC Role / Device Role / Timing Role: Acts as low-drift, low-noise voltage source for ratiometric sensor signal conditioning. Use Value: Delivers stable 9.1 V reference with <0.22 V regulation shift across 15–260 mA load range. |
| Overvoltage Clamp Protection | Programmable Threshold Detector |
Use Scenario: Clamps transient spikes on 12 V automotive control bus during load-dump events. IC Role / Device Role / Timing Role: Shunts excess energy to ground when reverse voltage exceeds 9.1 V; works with series resistor. Use Value: Withstands 520 A surge (8.3 ms) without failure, protecting downstream CAN transceivers. | Use Scenario: Sets trip threshold for comparator-based battery undervoltage lockout in portable medical devices. IC Role / Device Role / Timing Role: Defines precise 9.1 V switching point for LM393 comparator input via resistive divider. Use Value: Enables repeatable 10% tolerance threshold with zero quiescent current in standby mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5346B | ±5% tolerance (B suffix); same VZ, IZT, ZZ, and package | Higher precision needed for feedback loops requiring tighter output regulation | Select 1N5346B when ±5% VZ stability is mandatory; otherwise 1N5346A/TR12 offers cost advantage |
| MMBZ5240BS-7-F | Surface-mount SOD-123 package; 9.1 V ±5%; 200 mW rating; 30 Ω ZZ | Space-constrained PCBs where axial leads are incompatible with layout or automated assembly | Choose MMBZ5240BS-7-F only for footprint-limited designs; derate power significantly vs. 5 W capability of 1N5346A/TR12 |
Compared with 1N5346B and MMBZ5240BS-7-F, the 1N5346A/TR12 delivers highest power handling (5 W) and lowest dynamic impedance (2.0 Ω) in axial-leaded form, making it optimal for high-current regulation and robust transient clamping where ±10% tolerance is acceptable.
Availability
1N5346A/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive control modules, sensor interface circuits, and medical device voltage references requiring stable component supply and long-term obsolescence management.
Supply support for 1N5346A/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 1N53xxA/B series was designed for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and extended temperature operation.
FAQ
What is the Zener voltage tolerance of the 1N5346A/TR12?
The 1N5346A/TR12 has a nominal Zener voltage of 9.1 V with ±10% tolerance, as indicated by the "A" suffix per Microsemi's documentation. This means its actual regulation voltage falls between 8.19 V and 10.01 V at 150 mA test current and 25 °C lead temperature. The tolerance is confirmed in the Electrical Characteristics table on page 1 of the official datasheet.
Does the 1N5346A/TR12 require dry packing before reflow soldering?
No, the 1N5346A/TR12 does not require dry packing. Its moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1, meaning it can be stored and processed without baking or humidity-controlled packaging. This simplifies manufacturing logistics and reduces assembly risk compared to higher-level moisture-sensitive devices.
What is the maximum surge current rating for the 1N5346A/TR12?
The 1N5346A/TR12 is rated for a maximum non-recurrent surge current (IZSM) of 520 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 permanent damage when properly mounted with adequate thermal mass.
How is polarity marked on the 1N5346A/TR12?
The 1N5346A/TR12 uses a cathode band to indicate polarity: the banded end is the cathode and must be connected to the higher-potential node (e.g., regulated output rail) when used in reverse-bias regulation mode. The anode (unbanded end) connects to ground or lower potential. This marking is consistent across all 1N53xx devices per Microsemi's mechanical drawings.
What is the thermal resistance of the 1N5346A/TR12, and how does it affect layout?
The 1N5346A/TR12 has a junction-to-lead thermal resistance of 25 °C/W when measured at 3/8″ (10 mm) lead length from the body. This low value allows dissipation of its full 5 W rating with simple lead-length heatsinking-no PCB copper pour or external heatsink is required if leads are trimmed to ≥10 mm. Layout must preserve this lead length for rated performance.
1N5346A/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:
- ±10%
- 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
1N5346A/TR12 FAQ
1.How can I place an order for 1N5346A/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5346A/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 1N5346A/TR12 reliable?
The price and inventory of 1N5346A/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5346A/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5346A/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5346A/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5346A/TR12?
1N5346A/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5346A/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 1N5346A/TR12?
For technical support, including 1N5346A/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5346A/TR12 requirements.
6.How does Aetrix verify that 1N5346A/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5346A/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 1N5346A/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5346A/TR12?
All 1N5346A/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5346A/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 1N5346A/TR12 part is unused and in its original packaging.
Return procedure for 1N5346A/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5346A/TR12 Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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