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Microchip Technology 1N5355C/TR12
- Part No.:
- 1N5355C/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5355C/TR12.pdf
- Description:
- DIODE ZENER 18V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:8,836
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Product details
Overview
1N5355C/TR12 from Microsemi is a silicon 5 W axial-leaded Zener diode with nominal regulation voltage of 18 V, ±2% tolerance (C suffix), 65 mA test current (IZT), 2.5 Ω maximum dynamic impedance (ZZ), and 75 mA maximum regulator current (IZM). 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 1N5355C/TR12 datasheet, 1N5355C/TR12 pinout, 1N5355C/TR12 application, or 1N5355C/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (75 A), voltage regulation (ΔVZ = 0.40 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage reference operating in reverse breakdown. Its regulation performance is defined at 65 mA test current with 2.5 Ω dynamic impedance and 0.40 V voltage regulation (ΔVZ) between 10% and 50% of IZM.
It features a T-18 axial package with cathode band marking, void-free UL94V-0 epoxy body, and lead termination compatible with 260 °C/10 s soldering. Thermal resistance is specified as 25 °C/W junction-to-lead at 10 mm lead length, enabling stable 5 W operation with adequate heat sinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V ±2% - precise regulation point for feedback networks requiring tight voltage stability |
| Test Current (IZT) | 65 mA - dc current at which VZ is measured; defines standard operating bias point |
| Dynamic Impedance (ZZ) | 2.5 Ω max - low ac impedance ensures minimal voltage shift under load transients |
| Max Regulator Current (IZM) | 75 mA - maximum continuous reverse current before thermal derating begins |
| Power Dissipation | 5.0 W at TL < 25°C - full rated power achievable only with proper lead heat sinking |
| Operating Temperature | –65°C to +150°C - supports industrial and aerospace environments without derating |
| Surge Current (IZSM) | 75 A (8.3 ms half-sine) - withstands transient overvoltage events in power rails |
Pinout & Package
Package: T-18 axial-leaded plastic case (JEDEC TO-204-AD), void-free UL94V-0 epoxy body, cathode indicated by band, 0.7 g weight, RoHS-compliant matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased reference terminal | Connected to lower-potential node; current flows into cathode during regulation |
| Cathode | Zener voltage output terminal | Banded end; held at stable 18 V above anode when reverse-biased above breakdown |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables high-accuracy feedback without external trimming in regulated DC-DC converters |
| 25 °C/W junction-to-lead thermal resistance | Allows full 5 W dissipation with simple 10 mm lead length heat sinking-no PCB copper pour required |
| 75 A non-repetitive surge rating | Protects downstream circuitry against line transients and inductive kickback without external TVS |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints-ready for immediate SMT/reflow or hand-solder |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates ESD protection circuitry in final assembly |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Provides stable 18 V reference for optocoupler-based feedback in isolated AC-DC adapters. IC Role / Device Role / Timing Role: Zener voltage reference element in secondary-side regulation loop. Use Value: ±2% tolerance ensures output voltage accuracy within ±1% across line/load/temperature without calibration. | Use Scenario: Supplies excitation voltage to bridge-based pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Precision shunt reference maintaining constant bias under varying supply conditions. Use Value: Low 2.5 Ω dynamic impedance minimizes sensor output drift caused by supply ripple. |
| Overvoltage Clamp for MCU I/O | Programmable Current Source Bias |
Use Scenario: Clamps 24 V field bus inputs to protect 3.3 V microcontroller GPIO pins. IC Role / Device Role / Timing Role: Shunt overvoltage protector placed between I/O line and ground. Use Value: 75 A surge rating absorbs repetitive 24 V transients without degradation-no sacrificial fuse needed. | Use Scenario: Sets reference voltage for LM334-based programmable current sources in LED driver circuits. IC Role / Device Role / Timing Role: Stable voltage node defining compliance voltage for current-setting resistor. Use Value: 0.40 V voltage regulation (ΔVZ) ensures current accuracy remains within ±0.5% over 10–50 mA operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5355B/TR12 | ±5% tolerance (vs. ±2%), identical VZ nominal, same package and IZT | Acceptable where system-level calibration compensates for initial tolerance | Select for cost-sensitive designs where post-assembly trimming is available |
| MMBZ5245BS-7-F | Surface-mount SOD-123 package, 18 V ±5%, 200 mW rating, 30 Ω ZZ | Limited to low-power signal-level clamping-not suitable for 5 W regulation | Choose only for space-constrained PCBs where power dissipation ≤200 mW |
Compared with 1N5355B/TR12 and MMBZ5245BS-7-F, the 1N5355C/TR12 delivers tighter initial accuracy and higher power handling-critical for uncalibrated analog front-ends and industrial power supplies where layout changes or component substitution cannot be tolerated.
Availability
1N5355C/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioning, overvoltage protection circuits, and precision analog reference designs requiring stable component supply and long-term obsolescence management.
Supply support for 1N5355C/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 components for aerospace, defense, and industrial markets.
The 1N53xx series was designed specifically for ruggedized, high-stability voltage regulation in harsh-environment power systems-emphasizing thermal robustness, surge resilience, and long-term parametric stability.
FAQ
What is the Zener voltage tolerance of the 1N5355C/TR12?
The 1N5355C/TR12 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix per Microsemi's specification. This means its measured breakdown voltage falls within 17.64 V to 18.36 V at 65 mA test current and 25 °C lead temperature. This tighter tolerance supports applications requiring high initial accuracy without calibration, such as closed-loop power supply feedback and precision sensor biasing.
Can the 1N5355C/TR12 be used in surface-mount designs?
No-the 1N5355C/TR12 uses an axial-leaded T-18 package and is not a surface-mount device. For SMT equivalents, Microsemi offers the SMBJ5355C series in DO-214AA (SMB) package. The 1N5355C/TR12 requires through-hole mounting with 10 mm lead length for optimal thermal performance and full 5 W power rating.
What is the maximum surge current rating for the 1N5355C/TR12?
The 1N5355C/TR12 has a maximum non-repetitive surge current (IZSM) of 75 A, specified for an 8.3 ms half-sine waveform. This rating enables reliable transient suppression in industrial control inputs and power rail protection. Derating applies for repeated surges; sustained operation must remain within the 75 mA IZM limit at rated temperature conditions.
How does the thermal resistance of the 1N5355C/TR12 affect its power handling?
The 1N5355C/TR12 has a junction-to-lead thermal resistance of 25 °C/W at 10 mm lead length. This allows full 5 W dissipation only when leads act as heat sinks-mounting on FR4 with standard pads reduces steady-state power to 1.47 W. To achieve rated power, leads must extend ≥10 mm from the body and be thermally coupled to chassis or heatsink planes.
Is the 1N5355C/TR12 RoHS compliant?
Yes-the "e3" designation in Microsemi's documentation confirms RoHS compliance, and the 1N5355C/TR12 uses annealed matte-tin plating per MIL-STD-750 Method 2026. The "TR12" suffix indicates tape-and-reel packaging per EIA-296, and the device meets IPC/JEDEC J-STD-020B moisture sensitivity Level 1, requiring no dry pack prior to assembly.
1N5355C/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):
- 18 V
- Tolerance:
- ±2%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2.5 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 13 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
1N5355C/TR12 FAQ
1.How can I place an order for 1N5355C/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5355C/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 1N5355C/TR12 reliable?
The price and inventory of 1N5355C/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5355C/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5355C/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5355C/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5355C/TR12?
1N5355C/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5355C/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 1N5355C/TR12?
For technical support, including 1N5355C/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5355C/TR12 requirements.
6.How does Aetrix verify that 1N5355C/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5355C/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 1N5355C/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5355C/TR12?
All 1N5355C/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5355C/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 1N5355C/TR12 part is unused and in its original packaging.
Return procedure for 1N5355C/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5355C/TR12 Tags
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