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Microchip Technology 1N5346/TR8
- Part No.:
- 1N5346/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5346/TR8.pdf
- Description:
- DIODE ZENER 9.1V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:2,881
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Product details
Overview
1N5346/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 9.1 V ±5% (B-suffix), 150 mA test current, 2.0 Ω maximum dynamic impedance at IZT, and 520 Ω maximum knee impedance at 1.0 mA - used for precision voltage reference and overvoltage protection in DC power supplies and analog circuits.
For engineers reviewing the 1N5346/TR8 datasheet, 1N5346/TR8 pinout, 1N5346/TR8 application, or 1N5346/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (9.2 A), voltage regulation (ΔVZ = 0.22 V), and RoHS-compliant e3 marking compatibility.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-biased mode, with cathode indicated by a band and rated for continuous DC operation up to 150 °C junction temperature. Its low 25 °C/W thermal resistance enables stable 5 W dissipation when leads are mounted 3/8″ (10 mm) from body.
The 1N5346/TR8 exhibits minimal voltage drift across operating current (ΔVZ = 0.22 V between 10% and 50% of IZM) and maintains tight regulation under transient surges (8.3 ms half-sine, 9.2 A peak), making it suitable for industrial power rail stabilization where thermal and surge robustness are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±5% at 150 mA - defines precise regulation point for feedback loops and reference circuits. |
| Power Dissipation | 5.0 W at TL = 25 °C - supports high-current shunt regulation with adequate heatsinking. |
| Dynamic Impedance (ZZ) | 2.0 Ω max at 150 mA - ensures minimal output voltage variation under load current changes. |
| Max Surge Current (IZSM) | 9.2 A (8.3 ms half-sine) - withstands common AC line transients and inductive switching spikes. |
| Thermal Resistance | 25 °C/W junction-to-lead (3/8″ lead length) - enables predictable thermal design without PCB copper area dependency. |
| Reverse Leakage (IR) | 7.5 μA max at 6.6 V - guarantees low standby power loss in high-impedance bias networks. |
| Voltage Regulation (ΔVZ) | 0.22 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity. |
Pinout & Package
Package: Axial-leaded T-18 plastic case per JEDEC DO-201AD; moisture sensitivity level 1 (no dry pack required); RoHS-compliant e3 marking; cathode identified by color 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 during fault conditions. |
| Cathode | Zener regulation terminal / Voltage reference output | Banded end; connected to regulated node; maintains 9.1 V relative to anode under reverse bias. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures standardized mechanical dimensions, electrical behavior, and cross-manufacturer interchangeability. |
| ±5% voltage tolerance (B suffix) | Reduces calibration overhead in mid-precision applications like sensor excitation and ADC references. |
| Level 1 moisture sensitivity | Eliminates baking requirements before PCB assembly, lowering manufacturing cost and cycle time. |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables safe handling in standard production environments without special static control protocols. |
| Tape-and-reel packaging (TR8 suffix) | Supports automated pick-and-place placement with EIA-296 compliance for high-volume SMT-compatible assembly. |
Applications
| DC Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing +12 V rail in industrial PLC power module with variable load current. IC Role / Device Role / Timing Role: Shunt voltage regulator maintaining reference node against input ripple and load step changes. Use Value: Delivers 9.1 V reference with only 0.22 V regulation error across 15–75 mA operating range, reducing need for active LDO post-regulation. |
Use Scenario: Clamping transient spikes on microcontroller I/O lines exposed to relay coil back-EMF. IC Role / Device Role / Timing Role: Transient voltage suppressor diverting surge energy to ground before IC damage threshold. Use Value: Withstands 9.2 A surge (8.3 ms) while clamping below 12 V, protecting 3.3 V logic interfaces without response delay. |
| Instrumentation Reference Source | Automotive Sensor Bias Network |
Use Scenario: Providing stable excitation voltage for strain gauge Wheatstone bridge in weigh scale electronics. IC Role / Device Role / Timing Role: Precision voltage reference source with low dynamic impedance for ratiometric measurement accuracy. Use Value: 2.0 Ω ZZ minimizes bridge imbalance error caused by current draw variations, improving resolution to <0.1% full scale. |
Use Scenario: Biasing NTC thermistor in engine coolant temperature sensor circuit across -40 °C to +125 °C ambient. IC Role / Device Role / Timing Role: Temperature-stable voltage reference enabling linearized analog output over wide thermal range. Use Value: Maintains regulation within ±5% from -65 °C to +150 °C, supporting automotive-grade reliability without external compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5346B | No TR8 tape-and-reel packaging; bulk or ammo-pack only; identical electrical specs and T-18 package. | Not suitable for automated SMT assembly; requires manual or vibratory feeder handling. | Select 1N5346B only for low-volume prototyping or repair where reel packaging is unnecessary. |
| MMBZ5240BS-7-F | Surface-mount SOD-123 package; 9.1 V ±5%, but rated for only 225 mW; 30 Ω ZZ; not surge-rated. | Cannot replace 1N5346/TR8 in 5 W power regulation or surge suppression roles due to power and ruggedness limits. | Choose MMBZ5240BS-7-F only for space-constrained, low-power bias networks where thermal mass and surge immunity are non-critical. |
Compared with 1N5346B and MMBZ5240BS-7-F, the 1N5346/TR8 uniquely combines 5 W power handling, axial-leaded mechanical robustness, EIA-296 tape-and-reel automation support, and 9.2 A surge capability - making it the only option among the three for high-reliability, high-energy shunt regulation in industrial power systems.
Availability
1N5346/TR8 is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection circuits, and instrumentation reference sources requiring stable component supply and long-term obsolescence management.
Supply support for 1N5346/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, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized 5 W Zener regulation in harsh-environment power systems, emphasizing thermal stability, surge resilience, and JEDEC-standardized manufacturability.
FAQ
What is the Zener voltage tolerance of the 1N5346/TR8?
The 1N5346/TR8 has a Zener voltage tolerance of ±5%, indicated by the "B" suffix in its full designation. This means its actual regulation voltage falls between 8.65 V and 9.55 V when measured at 150 mA and 25 °C lead temperature. The TR8 suffix denotes tape-and-reel packaging and does not affect electrical specifications. This tolerance level balances precision and cost for industrial power reference applications.
Can the 1N5346/TR8 be used in surface-mount designs?
No - the 1N5346/TR8 uses an axial-leaded T-18 (DO-201AD) package and is not compatible with surface-mount assembly. It requires through-hole mounting with 3/8″ (10 mm) lead length from body for rated 5 W operation. For SMT equivalents, Microsemi offers the SMBJ5346B in SMB package, but that part has different thermal and surge ratings. The 1N5346/TR8 must be placed in plated-through holes with appropriate pad clearance and solder fillet geometry.
What is the maximum surge current rating for the 1N5346/TR8?
The 1N5346/TR8 is rated for a maximum non-recurrent surge current (IZSM) of 9.2 A, defined as the peak of an 8.3 ms half-sine waveform. This rating assumes proper lead mounting and thermal path; exceeding this value risks irreversible junction damage. The surge capability is validated per industry standards and enables use in relay-driving and motor-control circuits where inductive kickback occurs.
Does the 1N5346/TR8 require dry packing before PCB assembly?
No - the 1N5346/TR8 has IPC/JEDEC J-STD-020B moisture sensitivity level 1, meaning it may be stored and assembled without baking or dry pack. This eliminates pre-reflow moisture removal steps, reducing process complexity and cost. The void-free epoxy encapsulation and Level 1 classification are confirmed in Microsemi's official documentation for the 1N53xxB series.
How does the thermal resistance of the 1N5346/TR8 impact PCB layout?
The 1N5346/TR8 has a junction-to-lead thermal resistance of 25 °C/W when leads are trimmed to 3/8″ (10 mm) from the body - independent of PCB copper area. Layout must ensure mechanical support for axial leads and avoid excessive bending stress near the case. Unlike SMT Zeners, its thermal performance does not rely on pad copper area, simplifying layout for high-power shunt regulation in space-constrained industrial boards.
1N5346/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:
- ±20%
- 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
1N5346/TR8 FAQ
1.How can I place an order for 1N5346/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5346/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 1N5346/TR8 reliable?
The price and inventory of 1N5346/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5346/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5346/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5346/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5346/TR8?
1N5346/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5346/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 1N5346/TR8?
For technical support, including 1N5346/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5346/TR8 requirements.
6.How does Aetrix verify that 1N5346/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5346/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 1N5346/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5346/TR8?
All 1N5346/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5346/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 1N5346/TR8 part is unused and in its original packaging.
Return procedure for 1N5346/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5346/TR8 Tags
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