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Microchip Technology 1N5355C/TR8
- Part No.:
- 1N5355C/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5355C/TR8.pdf
- Description:
- DIODE ZENER 18V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,599
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Product details
Overview
1N5355C/TR8 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 across –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in industrial power supplies.
For engineers reviewing the 1N5355C/TR8 datasheet, 1N5355C/TR8 pinout, 1N5355C/TR8 application, or 1N5355C/TR8 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 diode 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, UL94V-0 epoxy body, and is rated for 5.0 W steady-state dissipation at 25 °C lead temperature (3/8″ from body). Thermal resistance is 25 °C/W junction-to-lead and 85 °C/W junction-to-ambient on FR4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V ±2% - precise regulation point for stable reference generation |
| Test Current (IZT) | 65 mA - operating point where VZ and ZZ are specified |
| Dynamic Impedance (ZZ) | 2.5 Ω max - low AC resistance ensures minimal output voltage variation under load transients |
| Max Regulator Current (IZM) | 75 mA - maximum continuous DC current before thermal derating applies |
| Voltage Regulation (ΔVZ) | 0.40 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
| Surge Current (IZSM) | 75 A - peak non-repetitive half-sine (8.3 ms) capability for transient suppression |
| Thermal Resistance (RθJL) | 25 °C/W - junction-to-lead value enabling thermal design with standard lead-mounting practices |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case (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 | Reverse-bias reference terminal | Connected to system ground or lower potential node during regulation |
| Cathode | Regulated output terminal | Banded end; held at stable 18 V relative to anode when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables tighter regulation than ±5% (B) or ±10% (A) variants in feedback loops and references |
| 5.0 W power rating at TL = 25 °C | Supports higher continuous current than 1 W Zeners without forced cooling in compact layouts |
| Moisture sensitivity Level 1 (IPC/JEDEC J-STD-020B) | Eliminates dry-pack requirement and bake-out prior to assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for ESD-protected workstations |
| RoHS-compliant (e3 suffix) | Meets global environmental compliance without lead-based solder compatibility compromises |
Applications
| Industrial Power Supply Reference | Overvoltage Clamp in DC-DC Converters |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback or forward converter secondary-side regulation. IC Role / Device Role / Timing Role: Two-terminal voltage reference providing fixed 18 V reference for optocoupler or error amplifier input. Use Value: ±2% tolerance ensures consistent output voltage accuracy across production batches without trimming. |
Use Scenario: Protecting MOSFET gate drivers or controller ICs from transient overvoltage on auxiliary bias rails. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage to 18 V during startup surges or transformer leakage spikes. Use Value: 75 A surge rating absorbs 8.3 ms half-sine transients without degradation, extending system reliability. |
| Programmable Logic Controller (PLC) Input Protection | Test Equipment Voltage Calibration Standard |
Use Scenario: Conditioning 24 V field inputs in industrial PLC modules against EMI-induced spikes. IC Role / Device Role / Timing Role: Primary shunt element in input protection network, clamping to 18 V before TVS activation. Use Value: Low 2.5 Ω dynamic impedance maintains clamping voltage stability under fast-rising transients. |
Use Scenario: Serving as a traceable 18 V reference in benchtop multimeter calibration fixtures. IC Role / Device Role / Timing Role: Precision Zener reference replacing bulkier active references in portable calibrators. Use Value: Stable 18 V output over –65 °C to +150 °C enables calibration across environmental chambers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5355B/TR8 | ±5% tolerance (vs. ±2% for 1N5355C/TR8); otherwise identical VZ, IZT, ZZ, and packaging | Acceptable where tighter regulation is not required; lower cost in high-volume industrial designs | Select when ±5% regulation error is within system margin and cost optimization is prioritized |
| MMBZ5245B-TP | Surface-mount SOD-123 package; 18 V ±5%, 20 mA IZT, 22 Ω ZZ, 0.5 W rating | Not suitable for 5 W power handling; limited to low-power signal-level clamping or biasing | Choose only for space-constrained PCBs where thermal and power requirements are ≤0.5 W |
Compared with 1N5355B/TR8 and MMBZ5245B-TP, the 1N5355C/TR8 delivers superior voltage accuracy and thermal robustness for 5 W-class regulation, making it optimal for mains-connected industrial power stages where ±2% stability and 75 A surge immunity are critical.
Availability
1N5355C/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, programmable logic controllers (PLCs), DC-DC converter protection circuits, and test equipment calibration systems requiring stable component supply and long-term obsolescence management.
Supply support for 1N5355C/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 1N53xx series was designed specifically for ruggedized 5 W voltage regulation in harsh-environment power systems, emphasizing thermal resilience, ESD immunity, and long-term parametric stability.
FAQ
What is the Zener voltage tolerance of the 1N5355C/TR8?
The 1N5355C/TR8 has a Zener voltage tolerance of ±2%, as indicated by the "C" suffix in its part number. This means its nominal 18 V regulation voltage falls within 17.64 V to 18.36 V at 65 mA test current and 25 °C lead temperature. This tighter tolerance supports precision feedback and reference applications where ±5% variants like the 1N5355B/TR8 would introduce excessive error.
Can the 1N5355C/TR8 be used in surface-mount designs?
No, the 1N5355C/TR8 uses a T-18 axial-leaded package and is not a surface-mount device. For SMT equivalents, Microsemi offers the SMBJ5355C series in DO-214AA (SMB) package, which shares the same 18 V ±2% specification but requires different PCB layout and thermal management. The TR8 tape-and-reel packaging of 1N5355C/TR8 supports axial automatic insertion, not pick-and-place.
What is the maximum surge current rating for the 1N5355C/TR8?
The 1N5355C/TR8 is rated for a maximum non-repetitive surge current (IZSM) of 75 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating enables reliable transient suppression in power supply input stages and motor drive snubbers. Derating is required for repetitive surges or elevated ambient temperatures, per the device's power derating curve in Figure 1 of the datasheet.
How does the thermal resistance of the 1N5355C/TR8 affect PCB layout?
The 1N5355C/TR8 has a junction-to-lead thermal resistance (RθJL) of 25 °C/W when mounted with 3/8″ (10 mm) lead length from the body. To maintain safe junction temperature, PCB traces connected to its leads must act as heat sinks-wide copper pours (>4 mm²) and short, thick traces are recommended. On FR4 with 1 oz Cu, junction-to-ambient resistance rises to 85 °C/W, so layout must minimize ambient rise and avoid nearby heat sources.
Is the 1N5355C/TR8 RoHS compliant?
Yes, the 1N5355C/TR8 is RoHS compliant, as confirmed by the "e3" suffix in its full manufacturer designation (1N5355C/TR8 e3). Its leads are plated with annealed matte tin per MIL-STD-750 Method 2026, and its void-free thermosetting epoxy body meets UL94V-0 flammability standards. No lead or other restricted substances exceed EU RoHS limits.
1N5355C/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):
- 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/TR8 FAQ
1.How can I place an order for 1N5355C/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5355C/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 1N5355C/TR8 reliable?
The price and inventory of 1N5355C/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5355C/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5355C/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5355C/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5355C/TR8?
1N5355C/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5355C/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 1N5355C/TR8?
For technical support, including 1N5355C/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5355C/TR8 requirements.
6.How does Aetrix verify that 1N5355C/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5355C/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 1N5355C/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5355C/TR8?
All 1N5355C/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5355C/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 1N5355C/TR8 part is unused and in its original packaging.
Return procedure for 1N5355C/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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