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Microchip Technology 1N5346A/TR8
- Part No.:
- 1N5346A/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5346A/TR8.pdf
- Description:
- DIODE ZENER 9.1V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,742
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Product details
Overview
1N5346A/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 9.1 V, ±10% tolerance (A suffix), 150 mA maximum Zener current (IZM), 2.0 Ω dynamic impedance (ZZ) at 150 mA test current, and cathode band polarity marking. It delivers stable voltage reference in power supply feedback loops, overvoltage protection circuits, and precision biasing networks operating from -65°C to +150°C.
For engineers reviewing the 1N5346A/TR8 datasheet, 1N5346A/TR8 pinout, 1N5346A/TR8 application, or 1N5346A/TR8 equivalent, key selection criteria include its 9.1 V Zener voltage, ±10% tolerance, 5 W power rating at 25°C lead temperature, low 2.0 Ω dynamic impedance, and RoHS-compliant matte-tin plating - all critical for industrial power regulation and transient suppression designs.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-biased mode, with Zener voltage specified at 9.1 V measured at 150 mA (IZT) under TL = 25°C conditions. Its thermal resistance is 25°C/W junction-to-lead (3/8" lead length) and 85°C/W junction-to-ambient on FR4 board, enabling high-current operation when adequately heat-sunk.
The 1N5346A/TR8 exhibits 0.22 V voltage regulation (ΔVZ) between 10% and 50% of IZM, confirming tight regulation across load current variation. It withstands non-recurrent 8.3 ms half-sine surge currents up to 9.2 A and maintains ≤7.5 μA reverse leakage at 6.9 V (VR).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±10% - defines precise clamping threshold for voltage reference and overvoltage protection circuits |
| Power Dissipation | 5.0 W at TL = 25°C - supports robust regulation under sustained DC load without forced cooling |
| Test Current (IZT) | 150 mA - standard operating point where VZ and ZZ are guaranteed per JEDEC specification |
| Dynamic Impedance (ZZ) | 2.0 Ω max at IZT - ensures minimal output voltage shift under varying load current |
| Max Reverse Current (IR) | 7.5 μA at VR = 6.9 V - guarantees low leakage in standby and high-impedance bias networks |
| Surge Current (IZSM) | 9.2 A peak (8.3 ms half-sine) - enables reliable transient suppression without failure |
| Operating Temperature | -65°C to +150°C - validated for aerospace, automotive, and industrial environments |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), 0.7 g weight, cathode indicated by colored band. Leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side | Connected to circuit ground or lower potential node in reverse-bias regulation configuration |
| Cathode | Zener breakdown terminal / high-voltage side | Banded end; connected to input rail or regulated node - must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with industry-standard 1N53xxB family mechanical and electrical definitions for interchangeability |
| Moisture Sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out before PCB assembly |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - safe for manual handling and standard SMT lines without special precautions |
| High Surge Withstand | Rated for 9.2 A non-recurrent surge - protects downstream circuitry against lightning-induced transients and inductive kickback |
| Stable Regulation Over Temp | ΔVZ = 0.22 V across 10–50% IZM confirms minimal drift in feedback loops across operating range |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converter feedback path via optocoupler interface. IC Role / Device Role / Timing Role: Precision voltage reference establishing error amplifier setpoint. Use Value: 9.1 V ±10% tolerance and 2.0 Ω dynamic impedance ensure ±1.5% output regulation accuracy under line/load transients. |
Use Scenario: Clamps 12 V rail during load dump events in automotive ECUs. IC Role / Device Role / Timing Role: Shunt protector diverting excess energy to ground before IC damage occurs. Use Value: 9.2 A surge rating and 0.22 V ΔVZ enable reliable clamping without thermal runaway during 100 ms overvoltage spikes. |
| Industrial Sensor Biasing | Programmable Logic Controller Input Conditioning |
Use Scenario: Provides stable 9.1 V bias to bridge sensor amplifiers in factory-floor pressure transmitters. IC Role / Device Role / Timing Role: Low-drift voltage reference for analog front-end excitation. Use Value: -65°C to +150°C operating range and <7.5 μA IR at 6.9 V maintain signal integrity in unheated enclosures. |
Use Scenario: Limits input voltage to 24 V digital input modules exposed to field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp ahead of TVS and series resistor. Use Value: Axial T-18 package allows through-hole mounting with 3/8" lead length for optimal thermal dissipation on industrial PCBs. |
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 (vs. ±10% for 1N5346A/TR8); identical VZ, IZT, ZZ, and package | Higher precision required in closed-loop feedback where tighter voltage setpoint is critical | Select 1N5346B when regulation accuracy >±5% is mandated; otherwise 1N5346A/TR8 offers cost advantage |
| MMBZ5240BLT1G | Surface-mount SOT-23 package; 9.1 V ±5%, 200 mW rating (vs. 5 W axial) | Low-power portable electronics where board space and weight constrain axial components | Choose MMBZ5240BLT1G only for sub-100 mA applications; 1N5346A/TR8 remains preferred for >500 mW dissipation |
Compared with 1N5346B and MMBZ5240BLT1G, the 1N5346A/TR8 uniquely balances 5 W power handling, axial-mount thermal reliability, and ±10% cost-effective tolerance - making it optimal for industrial power supplies and ruggedized protection circuits where sustained dissipation and mechanical robustness are prioritized.
Availability
1N5346A/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECU protection circuits, and sensor biasing networks requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for 1N5346A/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xxA/B series was engineered for ruggedized voltage regulation in mission-critical power systems - emphasizing thermal stability, surge resilience, and long-term parametric consistency under extreme environmental stress.
FAQ
What is the Zener voltage tolerance of the 1N5346A/TR8?
The 1N5346A/TR8 has a nominal Zener voltage of 9.1 V with ±10% tolerance, as designated by the "A" suffix per Microsemi's documentation. This means the actual measured VZ falls between 8.19 V and 10.01 V at 150 mA test current and TL = 25°C. The tolerance directly impacts regulation accuracy in feedback and protection circuits - users requiring tighter control should consider the 1N5346B (±5%) variant instead of the 1N5346A/TR8.
Can the 1N5346A/TR8 be used in surface-mount designs?
No, the 1N5346A/TR8 is an axial-leaded T-18 package and is not compatible with surface-mount assembly. It requires through-hole mounting with 3/8" (10 mm) lead length from body for proper thermal performance. For SMT equivalents, Microsemi offers the SMBJ5346B or SMBG5346B - but these are distinct part numbers with different packaging, ratings, and thermal characteristics than the 1N5346A/TR8.
What is the maximum surge current rating for the 1N5346A/TR8?
The 1N5346A/TR8 is rated for a maximum non-recurrent surge current (IZSM) of 9.2 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating is confirmed in the official Microsemi datasheet and reflects the device's ability to absorb transient energy without failure - a key parameter for overvoltage protection applications where the 1N5346A/TR8 serves as the first line of defense against inductive switching spikes or load dump events.
How does the thermal resistance of the 1N5346A/TR8 affect its power handling?
The 1N5346A/TR8 has a junction-to-lead thermal resistance of 25°C/W when mounted with 3/8" lead length, enabling full 5 W dissipation at TL = 25°C. On FR4 PCBs, its junction-to-ambient resistance rises to 85°C/W - limiting steady-state power to ~1.47 W at TA = 25°C. Therefore, effective heat sinking via lead length or copper pour is essential to sustain high-current operation; this thermal behavior is intrinsic to the 1N5346A/TR8's axial construction and must be modeled in layout.
Is the 1N5346A/TR8 RoHS compliant?
Yes, the 1N5346A/TR8 is RoHS compliant, as indicated by the "e3" designation in Microsemi's official documentation. Its leads feature annealed matte-tin plating meeting RoHS requirements, and the void-free thermosetting epoxy case complies with UL94V-0 flammability standards. The "TR8" suffix denotes tape-and-reel packaging per EIA-296, which is fully compatible with RoHS-constrained manufacturing processes - no exemptions or lead-containing materials are used in the 1N5346A/TR8.
1N5346A/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):
- 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/TR8 FAQ
1.How can I place an order for 1N5346A/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5346A/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 1N5346A/TR8 reliable?
The price and inventory of 1N5346A/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5346A/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5346A/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5346A/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5346A/TR8?
1N5346A/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5346A/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 1N5346A/TR8?
For technical support, including 1N5346A/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5346A/TR8 requirements.
6.How does Aetrix verify that 1N5346A/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5346A/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 1N5346A/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5346A/TR8?
All 1N5346A/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5346A/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 1N5346A/TR8 part is unused and in its original packaging.
Return procedure for 1N5346A/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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