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Microchip Technology 1N5346B/TR8
- Part No.:
- 1N5346B/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5346B/TR8.pdf
- Description:
- DIODE ZENER 9.1V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,349
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Product details
Overview
1N5346B/TR8 from Microsemi is a 5.0 W axial-leaded silicon Zener diode with a nominal regulation voltage of 9.1 V ±5%, 2.0 Ω maximum dynamic impedance at 150 mA test current, 7.5 V minimum reverse breakdown voltage at 7.5 μA, and 520 mA maximum Zener current when adequately heat-sunk. It delivers stable voltage reference in power supply regulation circuits operating from -65°C to +150°C.
For engineers reviewing the 1N5346B/TR8 datasheet, 1N5346B/TR8 pinout, 1N5346B/TR8 application, or 1N5346B/TR8 equivalent, key selection criteria include its ±5% tolerance, low 2.0 Ω Zener impedance, 520 mA IZM rating at TL < 25°C, RoHS-compliant matte-tin plating, and T-18 axial package compatibility with manual or wave soldering per MIL-STD-750.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse bias above its specified Zener voltage (VZ = 9.1 V) with minimal voltage variation across its rated current range (IZT = 150 mA). Its regulation performance is characterized by ΔVZ = 0.22 V - the difference between voltages measured at 10% and 50% of IZM - and ZZK = 200 Ω at 1.0 mA knee current.
The 1N5346B/TR8 features a void-free thermosetting epoxy case (UL94V-0), cathode band polarity marking, and thermal resistance of 25 °C/W junction-to-lead (3/8" lead length) or 85 °C/W junction-to-ambient on FR4 board. It withstands 8.3 ms non-repetitive surge currents up to 9.2 A and exhibits ESD insensitivity per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±5% - precise DC reference for feedback loops in linear regulators and overvoltage clamping |
| Test Current (IZT) | 150 mA - standardized operating point for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 2.0 Ω max - ensures minimal output voltage shift under load transients in regulation circuits |
| Max Zener Current (IZM) | 520 mA - maximum continuous reverse current sustainable at TL < 25°C with proper heatsinking |
| Reverse Leakage (IR) | 7.5 μA max at VR = 6.9 V - guarantees low standby power loss in high-impedance bias networks |
| Surge Current (IZSM) | 9.2 A peak (8.3 ms half-sine) - enables transient overvoltage suppression without failure |
| Voltage Regulation (ΔVZ) | 0.22 V - quantifies stability across 10–50% of IZM, critical for precision reference applications |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case (UL94V-0), 0.7 g weight, cathode indicated by color 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 / Reference ground node | Connected to circuit common or lower-potential rail; defines polarity for Zener operation |
| Cathode | Reverse-biased regulation terminal / Output reference node | Banded end; connected to regulated voltage node; maintains 9.1 V relative to anode under reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with industry-standard 1N53xxB mechanical and electrical specifications for interchangeability |
| ±5% voltage tolerance (B suffix) | Reduces calibration overhead in production power supplies versus ±10% or ±20% variants |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and floor-life constraints during PCB assembly |
| RoHS-compliant (e3 suffix) | Meets EU Directive 2011/65/EU with annealed matte-tin plating and halogen-free epoxy |
| Nonsensitive to ESD | Withstands handling without special grounding protocols per MIL-STD-750 Method 1020 |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Provides stable 9.1 V reference to TL431-like shunt regulator IC or directly biases error amplifier input. Use Value: Maintains ±1% output regulation across line/load variations due to low ΔVZ (0.22 V) and tight ±5% VZ tolerance. | Use Scenario: Placed across sensitive IC supply rails (e.g., microcontroller VDD) to clamp transient spikes. IC Role / Device Role / Timing Role: Acts as passive crowbar element, conducting when rail exceeds 9.1 V + margin to divert surge current. Use Value: Absorbs 9.2 A surge (8.3 ms) without degradation, protecting downstream logic from >12 V transients. |
| Linear Regulator Reference | Industrial Sensor Excitation |
Use Scenario: Supplies reference voltage to adjustable LDOs (e.g., LM317) in battery-powered instrumentation. IC Role / Device Role / Timing Role: Sets output voltage via resistor divider; replaces more expensive precision references where ±5% is acceptable. Use Value: Delivers stable 9.1 V at 150 mA with only 2.0 Ω dynamic impedance, minimizing load-induced drift. | Use Scenario: Powers resistive bridge sensors (e.g., strain gauges) requiring low-noise, constant-voltage excitation. IC Role / Device Role / Timing Role: Serves as low-impedance voltage source; filters ripple via external capacitor to reduce excitation noise. Use Value: Achieves <1 mVpp ripple contribution due to low ZZ and high IZM headroom, improving sensor SNR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5346B (bulk) | Identical electrical specs; differs only in packaging - no tape-and-reel (TR) carrier | No automated pick-and-place support; suitable for hand-soldered prototypes or low-volume repair | Select 1N5346B/TR8 for SMT line integration; choose bulk 1N5346B for bench testing or field replacement |
| MMBZ5240B (SOT-23) | Same 9.1 V ±5%, but 0.5 W rating, 20 Ω ZZ, and surface-mount package | Limited to low-power biasing; cannot replace 1N5346B/TR8 in 5 W regulation or surge-clamp roles | Use MMBZ5240B only in space-constrained, low-current applications where thermal mass is not required |
Compared with 1N5346B (bulk) and MMBZ5240B, the 1N5346B/TR8 uniquely combines JEDEC-standard axial form factor, 5 W power handling, tape-and-reel automation readiness, and industrial temperature range (-65°C to +150°C) - making it optimal for high-reliability power supply and protection designs requiring proven legacy compatibility.
Availability
1N5346B/TR8 is available at Aetrix Electronics and suitable for switch-mode power supply feedback, overvoltage protection clamp, and linear regulator reference applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N5346B/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 1N53xxB series was designed as a ruggedized, JEDEC-standard 5 W Zener platform for mission-critical voltage regulation and transient suppression in harsh-environment power systems.
FAQ
What is the Zener voltage tolerance of the 1N5346B/TR8?
The 1N5346B/TR8 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix in its part number. This means its nominal 9.1 V regulation voltage falls within 8.65 V to 9.55 V at 25°C under 150 mA test current. The tolerance is guaranteed per JEDEC specification and applies across the full operating temperature range of -65°C to +150°C.
Can the 1N5346B/TR8 be used in surface-mount designs?
No, the 1N5346B/TR8 is an axial-leaded T-18 package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5346B (DO-214AA) and SMBG5346B (DO-214AB) variants. The 1N5346B/TR8 requires through-hole mounting with 3/8" lead length for thermal derating compliance and must be soldered using wave or selective processes per MIL-STD-750.
What is the maximum surge current rating for the 1N5346B/TR8?
The 1N5346B/TR8 is rated for a maximum non-repetitive surge current (IZSM) of 9.2 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating assumes proper PCB layout with adequate copper pour and is validated per Microsemi's test methodology. Exceeding this value risks irreversible junction damage, even if average power remains within 5 W limits.
Does the 1N5346B/TR8 require dry packing before PCB assembly?
No, the 1N5346B/TR8 has IPC/JEDEC J-STD-020B moisture sensitivity level (MSL) 1, meaning it is not moisture-sensitive and does not require dry packing, baking, or floor-life tracking prior to reflow or wave soldering. Its void-free thermosetting epoxy body inherently prevents moisture ingress, simplifying manufacturing logistics.
How does the dynamic impedance of the 1N5346B/TR8 affect regulation accuracy?
The 1N5346B/TR8 has a maximum dynamic impedance (ZZ) of 2.0 Ω at 150 mA, which directly determines how much its Zener voltage shifts under changing load current. For example, a 100 mA load step causes ≤0.2 V deviation (100 mA × 2.0 Ω), enabling tighter regulation than higher-ZZ alternatives. This low impedance supports stable feedback in switching regulators and low-drift references where current varies dynamically.
1N5346B/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:
- ±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/TR8 FAQ
1.How can I place an order for 1N5346B/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5346B/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 1N5346B/TR8 reliable?
The price and inventory of 1N5346B/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5346B/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5346B/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5346B/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5346B/TR8?
1N5346B/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5346B/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 1N5346B/TR8?
For technical support, including 1N5346B/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5346B/TR8 requirements.
6.How does Aetrix verify that 1N5346B/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5346B/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 1N5346B/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5346B/TR8?
All 1N5346B/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5346B/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 1N5346B/TR8 part is unused and in its original packaging.
Return procedure for 1N5346B/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5346B/TR8 Tags
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MM5Z5V1ST1G
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