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Microchip Technology 1N5345/TR12
- Part No.:
- 1N5345/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5345/TR12.pdf
- Description:
- DIODE ZENER 8.7V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,437
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Product details
Overview
1N5345/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 8.7 V ±5% (B suffix), 150 mA test current (IZT), 2.0 Ω maximum dynamic impedance (ZZ), and 545 Ω maximum knee impedance (ZZK) at 1.0 mA. It operates from –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5345/TR12 datasheet, 1N5345/TR12 pinout, 1N5345/TR12 application, or 1N5345/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (9.5 A), voltage regulation (ΔVZ = 0.20 V), and RoHS-compliant e3 marking compatibility.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown. Its Zener voltage is specified at 25 °C with 150 mA DC test current and exhibits low dynamic impedance (2.0 Ω) for stable regulation across load variations.
Thermal design relies on lead-length-dependent junction-to-lead resistance (25 °C/W at 10 mm lead length) and requires adequate heat sinking to sustain 5 W steady-state dissipation; derating begins above 25 °C ambient per Figure 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7 V ±5% - defines regulated output voltage under nominal 150 mA bias; tight tolerance enables accurate reference generation. |
| Power Dissipation (Pd) | 5.0 W at TL < 25 °C - maximum continuous power handling with proper lead-length heat sinking. |
| Dynamic Impedance (ZZ) | 2.0 Ω max - low AC impedance ensures minimal voltage shift under varying load current. |
| Max Regulator Current (IZM) | 545 mA - peak DC current before exceeding 5 W at upper VZ limit (9.1 V). |
| Surge Current (IZSM) | 9.5 A - non-repetitive 8.3 ms half-sine pulse capability for transient overvoltage clamping. |
| Voltage Regulation (ΔVZ) | 0.20 V - difference between VZ measured at 10% and 50% of IZM; quantifies regulation linearity. |
| Reverse Leakage (IR) | 10 μA max at VR = 6.25 V - low off-state current preserves efficiency in high-impedance bias networks. |
Pinout & Package
Package: Axial-leaded T-18 plastic case (Void-free UL94V-0 epoxy), cathode indicated by band; leads are tin-lead or RoHS-compliant matte-tin plated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; reverse-biased operation requires cathode at higher potential. |
| Cathode | Zener breakdown terminal / regulation output node | Banded end; connected to regulated voltage rail; must be held positive relative to anode during regulation. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N53xxB series | Industry-standard footprint and electrical behavior enabling drop-in replacement across multiple vendors. |
| Moisture Sensitivity Level 1 | No dry pack required prior to soldering - simplifies manufacturing handling and storage. |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Robust against electrostatic discharge without special handling - reduces assembly yield loss. |
| RoHS-compliant e3 marking option | Meets environmental compliance requirements without performance trade-offs. |
| High surge current withstand (9.5 A) | Clamps short-duration transients without degradation - suitable for input-stage protection. |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Voltage reference element setting error amplifier threshold; replaces TL431 in cost-sensitive designs. Use Value: 8.7 V ±5% tolerance and 0.20 V ΔVZ ensure stable regulation across line/load/temperature - critical for ±1% output accuracy. | Use Scenario: Provides stable excitation voltage for bridge-based pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Precision analog reference source; biased at 150 mA to minimize ZZ-induced drift. Use Value: Low 2.0 Ω dynamic impedance maintains reference stability despite sensor bridge current variations up to ±20 mA. |
| Overvoltage Clamp for MCU I/O | Programmable Threshold Detector |
Use Scenario: Placed between microcontroller GPIO and external signal lines to suppress ESD and surge events. IC Role / Device Role / Timing Role: Transient voltage suppression device; operates in avalanche mode during overvoltage. Use Value: 9.5 A surge rating and 8.7 V clamping voltage protect 3.3 V/5 V I/O pins without sacrificing response time. | Use Scenario: Configured with comparator to trigger fault response when supply exceeds 8.7 V threshold. IC Role / Device Role / Timing Role: Programmable voltage threshold element; sets hysteresis point via resistor divider. Use Value: Tight ±5% tolerance and minimal ΔVZ enable repeatable trip points across temperature - essential for reliable system monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5345B | No TR12 tape-and-reel packaging; bulk or ammo pack only; identical electrical specs. | Not suitable for automated SMT placement; requires manual or vibration-feed handling. | Select 1N5345B for prototyping or low-volume hand assembly where reel format is unnecessary. |
| MMSZ5236B-TP | Surface-mount SOD-123 package; 8.7 V ±5%; 500 mW rating; 10x lower power than 1N5345/TR12. | Limited to low-power bias/reference roles; cannot replace 1N5345/TR12 in 5 W regulation or surge clamping. | Choose MMSZ5236B-TP only for space-constrained PCBs where thermal load is <500 mW. |
Compared with 1N5345/TR12, the 1N5345B offers identical regulation performance but lacks tape-and-reel support for high-speed placement, while MMSZ5236B-TP trades 10× lower power and SMT compatibility for inability to handle 5 W loads or 9.5 A surges.
Availability
1N5345/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor references, overvoltage clamping circuits, and programmable threshold detectors requiring stable component supply and JEDEC-standard Zener performance.
Supply support for 1N5345/TR12 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 to deliver robust, JEDEC-standard 5 W Zener regulation with military-grade screening options, moisture-insensitive packaging, and wide temperature operation for mission-critical power and protection circuits.
FAQ
What is the Zener voltage tolerance of the 1N5345/TR12?
The 1N5345/TR12 has a Zener voltage tolerance of ±5%, denoted by the "B" suffix in its full part number. This means its nominal 8.7 V regulation voltage falls within 8.27 V to 9.13 V at 25 °C with 150 mA test current. The tolerance remains valid across the full operating temperature range of –65 °C to +150 °C, as confirmed in the Microsemi datasheet revision D.
Does the 1N5345/TR12 require dry packing before reflow soldering?
No, the 1N5345/TR12 does not require dry packing before soldering. It carries IPC/JEDEC J-STD-020B Moisture Sensitivity Level 1 classification, meaning it is exempt from moisture barrier bag requirements and can be stored and processed under standard ambient conditions without baking.
What is the maximum surge current rating for the 1N5345/TR12?
The 1N5345/TR12 is rated for a maximum non-repetitive surge current (IZSM) of 9.5 A. This value corresponds to a single 8.3 ms half-sine waveform and is validated under the conditions specified in Microsemi's 1N5333B–1N5388B datasheet. It reflects the device's ability to clamp transient overvoltages without failure.
How does the thermal resistance of the 1N5345/TR12 affect its power handling?
The 1N5345/TR12 has a junction-to-lead thermal resistance of 25 °C/W when mounted with 10 mm lead length from the body. This allows full 5 W dissipation only if the lead temperature (TL) stays below 25 °C; above that, power must be linearly derated. On FR4 PCBs, junction-to-ambient resistance rises to 85 °C/W, limiting usable power to ~1.47 W at 25 °C ambient.
Is the 1N5345/TR12 RoHS compliant?
Yes, the 1N5345/TR12 is RoHS compliant, as indicated by the "e3" suffix in its full manufacturer designation (1N5345B e3). Its leads use annealed matte-tin plating per MIL-STD-750, and the encapsulant meets UL94V-0 flammability standards - all verified in Microsemi's official documentation.
1N5345/TR12 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:
- ±20%
- 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
1N5345/TR12 FAQ
1.How can I place an order for 1N5345/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5345/TR12 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 1N5345/TR12 reliable?
The price and inventory of 1N5345/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5345/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5345/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5345/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5345/TR12?
1N5345/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5345/TR12 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 1N5345/TR12?
For technical support, including 1N5345/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5345/TR12 requirements.
6.How does Aetrix verify that 1N5345/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5345/TR12 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 1N5345/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5345/TR12?
All 1N5345/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5345/TR12, 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 1N5345/TR12 part is unused and in its original packaging.
Return procedure for 1N5345/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5345/TR12 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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