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Microchip Technology 1N5345B/TR8
- Part No.:
- 1N5345B/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5345B/TR8.pdf
- Description:
- DIODE ZENER 8.7V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:3,308
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Product details
Overview
1N5345B/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 8.7 V ±5%, 150 mA test current (IZT), 2.0 Ω maximum dynamic impedance (ZZ), and 10 μA maximum reverse leakage at 6.25 V (VR). It operates from –65°C to +150°C and is used for precision voltage reference and overvoltage protection in DC power supplies and analog circuits.
For engineers reviewing the 1N5345B/TR8 datasheet, 1N5345B/TR8 pinout, 1N5345B/TR8 application, or 1N5345B/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (545 A), voltage regulation (ΔVZ = 0.20 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown mode. Its 8.7 V nominal Zener voltage is specified at 150 mA (IZT) with ±5% tolerance (B suffix), and it maintains stable regulation across 10%–50% of IZM (9.5 A), yielding ΔVZ ≤ 0.20 V.
Thermal design relies on low junction-to-lead thermal resistance (25 °C/W at 3/8″ lead length), enabling 5 W dissipation at TL ≤ 25°C. Reverse leakage is limited to 10 μA at VR = 6.25 V, and forward voltage is ≤1.2 V at 1.0 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7 V ±5% at 150 mA - defines precise regulation point for feedback loops and reference generation |
| Power Dissipation | 5.0 W at TL ≤ 25°C - requires minimum 3/8″ lead length heat sinking for full-rated operation |
| Dynamic Impedance (ZZ) | 2.0 Ω max at 150 mA - ensures minimal output voltage shift under load transients |
| Reverse Leakage (IR) | 10 μA max at 6.25 V - guarantees low quiescent current in standby or high-impedance bias networks |
| Surge Current (IZSM) | 545 A peak (8.3 ms half-sine) - withstands common transient overvoltage events without failure |
| Voltage Regulation (ΔVZ) | 0.20 V max (10% to 50% of IZM) - quantifies line regulation stability across operating current range |
| Thermal Resistance | 25 °C/W junction-to-lead - enables predictable temperature rise with defined mechanical mounting |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; reverse-biased operation requires cathode at higher potential |
| Cathode | Regulated output node | Banded end; held at stable 8.7 V relative to anode when reverse current ≥ IZT |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Fully standardized 1N-series part with guaranteed parametric compliance per JESD201 |
| Moisture Sensitivity Level 1 | No dry pack required - simplifies SMT reflow prep and reduces handling overhead |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling in assembly |
| High Surge Withstand | 545 A non-recurrent surge rating - supports robustness in industrial power input stages |
| RoHS Compliant (e3) | Matte-tin plating meets EU RoHS Directive 2011/65/EU - suitable for green manufacturing |
Applications
| DC Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing unregulated 12 V rail in industrial control module using resistor-Zener shunt topology. IC Role / Device Role / Timing Role: Voltage reference and shunt regulator providing fixed 8.7 V reference for error amplifier feedback. Use Value: Maintains ±0.20 V regulation across 0.95–4.75 A load current range, minimizing output drift under varying line conditions. |
Use Scenario: Clamping transient spikes on 10 V sensor supply line exposed to inductive switching noise. IC Role / Device Role / Timing Role: Shunt overvoltage clamp activated above 8.7 V to divert surge energy to ground. Use Value: Absorbs 545 A surge (8.3 ms) without degradation, protecting downstream op-amps and ADCs from latch-up. |
| Temperature-Stable Reference | Current Source Biasing |
Use Scenario: Generating precision bias for thermistor-based temperature compensation network in telecom power converter. IC Role / Device Role / Timing Role: Low-drift Zener reference establishing stable 8.7 V node for current mirror input. Use Value: Delivers <0.20 V regulation shift from –40°C to +85°C ambient, ensuring consistent gain calibration. |
Use Scenario: Setting constant current for LED driver bias in automotive interior lighting module. IC Role / Device Role / Timing Role: Zener-based current source where 8.7 V drop across series resistor defines LED drive current. Use Value: Enables ±5% current accuracy over 10–100 mA range due to tight VZ tolerance and low ZZ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5345B (bulk) | Identical electrical specs; differs only in packaging - no tape-and-reel (TR8) carrier | Suitable for manual prototyping or low-volume hand-soldered assemblies | Select 1N5345B/TR8 for automated pick-and-place; choose bulk 1N5345B for bench testing or repair. |
| MMBZ5236BS-7-F | Surface-mount SOD-123 package; 8.7 V ±5%, but lower 0.5 W rating and 100 mA IZT | Limited to low-power signal-level regulation; cannot replace 1N5345B/TR8 in 5 W power applications | Use MMBZ5236BS-7-F only in space-constrained PCBs where thermal mass and power demand are <0.5 W. |
Compared with 1N5345B (bulk) and MMBZ5236BS-7-F, the 1N5345B/TR8 uniquely combines JEDEC-standard axial packaging, 5 W power handling, and tape-and-reel automation compatibility - making it optimal for high-reliability industrial power supply production.
Availability
1N5345B/TR8 is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection circuits, and temperature-stable reference designs requiring stable component supply and long-term manufacturability.
Supply support for 1N5345B/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 timing solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge immunity, and JEDEC-standardized interchangeability.
FAQ
What is the Zener voltage tolerance of the 1N5345B/TR8?
The 1N5345B/TR8 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix per Microsemi's documentation. This means its measured VZ at 150 mA falls between 8.265 V and 9.135 V at 25°C. The tolerance is guaranteed across the full operating temperature range (–65°C to +150°C), and the 1N5345B/TR8 is not rated for tighter tolerances like ±2% (C) or ±1% (D).
Can the 1N5345B/TR8 be used in surface-mount designs?
No, the 1N5345B/TR8 is an axial-leaded T-18 package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5345B or SMBG5345B in DO-214AA/DO-214AB packages. These share identical electrical specs but require different footprint and reflow profiles - the 1N5345B/TR8 must be mounted through-hole with 3/8″ lead length for full 5 W rating.
What is the maximum steady-state current the 1N5345B/TR8 can handle?
The 1N5345B/TR8 supports a maximum Zener current (IZM) of 9.5 A when adequately heat sunk at TL ≤ 25°C. This value is derived from P = 5 W and VZM = 8.7 V × 1.05 = 9.135 V (high-end tolerance), yielding IZM = 5 W ÷ 9.135 V ≈ 9.5 A. Operation above this current risks thermal runaway unless heatsinking reduces junction temperature.
Does the 1N5345B/TR8 meet RoHS requirements?
Yes, the 1N5345B/TR8 is RoHS compliant, as confirmed by the "e3" suffix in Microsemi's official documentation. Its leads feature annealed matte-tin plating per MIL-STD-750 Method 2026, and the void-free epoxy body meets UL94V-0 flammability standards - satisfying EU Directive 2011/65/EU without exemptions.
How does the 1N5345B/TR8 perform under surge conditions?
The 1N5345B/TR8 is rated for a non-recurrent surge current (IZSM) of 545 A (8.3 ms half-sine wave), verified per JEDEC standards. This allows it to safely clamp transient overvoltages in industrial power inputs without degradation. Its low dynamic impedance (2.0 Ω) and robust thermal design ensure repeatable performance even after multiple surge events within datasheet limits.
1N5345B/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):
- 8.7 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 6.25 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
1N5345B/TR8 FAQ
1.How can I place an order for 1N5345B/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5345B/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 1N5345B/TR8 reliable?
The price and inventory of 1N5345B/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5345B/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5345B/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5345B/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5345B/TR8?
1N5345B/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5345B/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 1N5345B/TR8?
For technical support, including 1N5345B/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5345B/TR8 requirements.
6.How does Aetrix verify that 1N5345B/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5345B/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 1N5345B/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5345B/TR8?
All 1N5345B/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5345B/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 1N5345B/TR8 part is unused and in its original packaging.
Return procedure for 1N5345B/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5345B/TR8 Tags
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MM5Z5V1ST1G
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