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Microchip Technology 1N5345CE3/TR8
- Part No.:
- 1N5345CE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5345CE3/TR8.pdf
- Description:
- DIODE ZENER 8.7V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,778
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Product details
Overview
1N5345CE3/TR8 from Microsemi is a 5.0 W axial-leaded silicon Zener diode with nominal regulation voltage of 8.7 V, ±2% tolerance (C suffix), 150 mA maximum Zener current (IZM), 2.0 Ω maximum dynamic impedance (ZZ) at 150 mA test current, and operates from –65°C to +150°C. It serves as a precision voltage reference in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the 1N5345CE3/TR8 datasheet, 1N5345CE3/TR8 pinout, 1N5345CE3/TR8 application, or 1N5345CE3/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 Zener voltage is specified at 25°C with 150 mA test current (IZT), and its low dynamic impedance ensures stable regulation across load variations. The T-18 axial package enables through-hole mounting with 3/8" lead length defining thermal performance.
It exhibits minimal voltage drift versus current due to tight ±2% tolerance and low ΔVZ (0.20 V between 10% and 50% IZM). The device meets MIL-PRF-19500 screening options when prefixed (e.g., MQ/MX/MV) and complies with IPC/JEDEC J-STD-020B Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7 V ±2% - precise reference for feedback networks requiring tight regulation |
| Power Dissipation | 5.0 W at TL < 25°C - supports high-current regulation with adequate heatsinking |
| Test Current (IZT) | 150 mA - defines operating point where VZ and ZZ are guaranteed |
| Dynamic Impedance (ZZ) | 2.0 Ω max at IZT - ensures low output impedance for stable voltage under varying loads |
| Max Reverse Current (IR) | 10 μA at VR = 6.25 V - confirms sharp knee and low leakage below regulation threshold |
| Surge Current (IZSM) | 545 A (8.3 ms half-sine) - withstands transient overvoltage events without failure |
| Voltage Regulation (ΔVZ) | 0.20 V - difference between VZ measured at 10% and 50% of IZM, indicating line regulation quality |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC TO-204-AC; void-free UL94V-0 epoxy body; cathode indicated by band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side in Zener operation | Connected to circuit ground or lower potential node during reverse-bias regulation |
| Cathode | Zener breakdown terminal / high-voltage side in Zener operation | Banded end; connected to unregulated input rail to clamp voltage at 8.7 V |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables accurate voltage setting in precision feedback paths without trimming |
| 25 °C/W junction-to-lead thermal resistance | Allows 5 W operation with simple lead-length heatsinking (3/8" from body) |
| RoHS-compliant e3 suffix | Meets environmental compliance requirements without lead-based solder compatibility issues |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and floor-life constraints for SMT assembly prep |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for ESD-protected workstations |
Applications
| Switching Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in the optocoupler feedback network of an isolated DC-DC converter to regulate output voltage. IC Role / Device Role / Timing Role: Precision voltage reference that sets the error amplifier trip point. Use Value: ±2% tolerance ensures output stays within ±1% regulation window across line/load/temperature. | Use Scenario: Placed across a 12 V rail to protect downstream logic from transients exceeding 9.5 V. IC Role / Device Role / Timing Role: Shunt clamping element that conducts excess current above 8.7 V. Use Value: 545 A surge rating absorbs 8.3 ms transients without degradation, preserving system reliability. |
| Industrial Sensor Excitation | Reference Voltage for ADC |
Use Scenario: Provides stable excitation voltage to a bridge-based pressure sensor in a process control module. IC Role / Device Role / Timing Role: Low-drift voltage source for ratiometric measurement accuracy. Use Value: 0.20 V ΔVZ ensures excitation remains stable across temperature-induced current shifts. | Use Scenario: Supplies reference voltage to a 12-bit SAR ADC in a data acquisition front-end. IC Role / Device Role / Timing Role: Low-noise, low-impedance analog reference node. Use Value: 2.0 Ω dynamic impedance minimizes code spread caused by reference loading variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5345B | Same 8.7 V nominal VZ but ±5% tolerance (B suffix) vs. ±2% (C suffix) | Lower accuracy; suitable where cost priority outweighs regulation tightness | Select 1N5345B only if ±5% tolerance satisfies system error budget and cost reduction is critical |
| SMBJ5345B | Surface-mount SMB package; same 8.7 V ±5%, 5 W rating, but higher thermal resistance (junction-to-ambient) | Requires PCB layout change; not drop-in compatible due to package and lead configuration | Choose SMBJ5345B only for space-constrained designs accepting trade-offs in thermal performance and mounting method |
Compared with 1N5345B and SMBJ5345B, the 1N5345CE3/TR8 delivers tighter voltage accuracy and RoHS compliance in a proven axial package, making it optimal for industrial power supplies where long-term stability and regulatory alignment are mandatory.
Availability
1N5345CE3/TR8 is available at Aetrix Electronics and suitable for switching power supplies, overvoltage protection circuits, and precision sensor excitation systems requiring stable component supply and full traceability.
Supply support for 1N5345CE3/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N53xxB series was designed for robust, high-power voltage regulation in harsh environments-emphasizing thermal resilience, surge immunity, and long-term parametric stability under extended temperature cycling.
FAQ
What is the Zener voltage tolerance of the 1N5345CE3/TR8?
The 1N5345CE3/TR8 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in the part number. This means its regulated voltage falls within 8.53–8.87 V at 25°C with 150 mA test current. This tighter tolerance supports precision regulation tasks where standard ±5% devices like the 1N5345B would introduce excessive error. The 1N5345CE3/TR8 maintains this specification across its rated operating temperature range.
Does the 1N5345CE3/TR8 require dry packing before PCB assembly?
No, the 1N5345CE3/TR8 does not require dry packing. It carries IPC/JEDEC J-STD-020B Level 1 moisture sensitivity, meaning it has no floor-life limitation and can be stored and assembled without baking or humidity-controlled packaging. This simplifies manufacturing logistics and reduces handling overhead compared to higher MSL-rated components. The 1N5345CE3/TR8's void-free epoxy body contributes to this robust moisture resistance.
What is the maximum surge current rating for the 1N5345CE3/TR8?
The 1N5345CE3/TR8 is rated for a maximum non-recurrent surge current (IZSM) of 545 A, defined as the peak of an 8.3 ms half-sine waveform. This rating reflects its ability to absorb short-duration overvoltage transients without parametric shift or failure. Engineers rely on this value when designing clamping circuits for automotive load-dump or industrial inductive-switching events. The 1N5345CE3/TR8 achieves this via optimized junction design and thermal mass in the T-18 package.
How does the thermal resistance of the 1N5345CE3/TR8 affect its power handling?
The 1N5345CE3/TR8 has a junction-to-lead thermal resistance of 25 °C/W when mounted with 3/8" (10 mm) lead length from the body. This allows full 5.0 W dissipation at lead temperature < 25°C. If leads are shorter or ambient conditions warmer, derating applies per Figure 1 in the datasheet. For example, at 75°C lead temperature, usable power drops to ~3.8 W. This direct thermal path makes the 1N5345CE3/TR8 more efficient than board-mounted alternatives with higher junction-to-ambient resistance.
Is the 1N5345CE3/TR8 compatible with lead-free soldering processes?
Yes, the 1N5345CE3/TR8 features RoHS-compliant annealed matte-tin plating on its leads, qualified for soldering at 260°C for up to 10 seconds-fully compatible with standard lead-free reflow and wave soldering profiles. Its e3 suffix explicitly denotes this compliance. Unlike legacy tin-lead finishes, the matte-tin plating resists oxidation and ensures reliable wetting without flux aggressiveness. The 1N5345CE3/TR8's qualification per MIL-STD-750 Method 2026 further validates its solderability robustness.
1N5345CE3/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:
- ±2%
- 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
1N5345CE3/TR8 FAQ
1.How can I place an order for 1N5345CE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5345CE3/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 1N5345CE3/TR8 reliable?
The price and inventory of 1N5345CE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5345CE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5345CE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5345CE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5345CE3/TR8?
1N5345CE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5345CE3/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 1N5345CE3/TR8?
For technical support, including 1N5345CE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5345CE3/TR8 requirements.
6.How does Aetrix verify that 1N5345CE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5345CE3/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 1N5345CE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5345CE3/TR8?
All 1N5345CE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5345CE3/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 1N5345CE3/TR8 part is unused and in its original packaging.
Return procedure for 1N5345CE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5345CE3/TR8 Tags
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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MM5Z5V1ST1G
onsemi
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