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Microchip Technology 1N5355E3/TR8
- Part No.:
- 1N5355E3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5355E3/TR8.pdf
- Description:
- DIODE ZENER 18V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:3,667
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Product details
Overview
1N5355E3/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 18 V, ±5% tolerance (B-suffix equivalent), 65 mA test current, 2.5 Ω maximum dynamic impedance at IZT, and 75 mA maximum Zener current (IZM) when adequately heat-sunk. It operates from –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in industrial power supplies.
For engineers reviewing the 1N5355E3/TR8 datasheet, 1N5355E3/TR8 pinout, 1N5355E3/TR8 application, or 1N5355E3/TR8 equivalent, key selection criteria include Zener voltage accuracy, 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 regulator operating in reverse breakdown mode. Its 18 V nominal Zener voltage is specified at 65 mA test current (IZT) with 2.5 Ω dynamic impedance (ZZ) and 0.40 V voltage regulation (ΔVZ) between 10% and 50% of IZM.
The 1N5355E3/TR8 uses a void-free thermosetting epoxy T-18 package with cathode band marking, rated for 5 W steady-state dissipation at 25 °C lead temperature (3/8″ from body), and exhibits 0.5 μA maximum reverse leakage at 14.4 V (90% of VZ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V nominal at 65 mA; defines stable regulation point for feedback loops and reference circuits |
| Tolerance | ±5% (B-suffix equivalent); ensures VZ remains within 17.1–18.9 V under specified conditions |
| Power Dissipation | 5.0 W at 25 °C lead temperature; requires thermal management above ambient for sustained operation |
| Dynamic Impedance (ZZ) | 2.5 Ω max at IZT; low impedance maintains stable output voltage under varying load currents |
| Max Reverse Leakage (IR) | 0.5 μA at 14.4 V; minimal off-state current preserves efficiency in standby modes |
| Voltage Regulation (ΔVZ) | 0.40 V; difference between VZ measured at 7.5 mA and 37.5 mA, indicating line regulation performance |
| Surge Current (IZSM) | 75 A peak (8.3 ms half-sine); enables transient overvoltage clamping without failure |
Pinout & Package
Package: Axial-leaded T-18 plastic encapsulated case with cathode indicated by colored band; moisture sensitivity level 1 (no dry pack required); RoHS-compliant matte-tin plated leads solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower potential; forward voltage ≤1.2 V at 1.0 A |
| Cathode | Zener regulation terminal / Voltage reference output | Banded end; operated positive relative to anode; delivers regulated 18 V in reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Ensures standardized mechanical dimensions and electrical behavior across qualified suppliers |
| Low thermal resistance (25 °C/W) | Enables high continuous Zener current (75 mA) with minimal temperature rise when mounted with 10 mm lead length |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for special handling during assembly; supports automated insertion |
| RoHS-compliant (e3 suffix) | Meets EU Directive 2011/65/EU; tin-lead-free matte-tin plating compatible with lead-free reflow |
| High surge current capability (75 A) | Provides robust transient suppression in DC power rails without external TVS devices |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side error amplifiers. IC Role / Device Role / Timing Role: Precision 18 V reference source for TL431 or optocoupler bias networks. Use Value: Tight ±5% tolerance and low ΔVZ (0.40 V) minimize output voltage drift across line/load variations. | Use Scenario: Clamping transient spikes on 24 V industrial control bus lines exposed to inductive switching noise. IC Role / Device Role / Timing Role: Shunt overvoltage protector placed across bus rail and ground. Use Value: 75 A surge rating and 5 W power handling absorb repetitive 8.3 ms transients without degradation. |
| Programmable Logic Controller (PLC) Input Conditioning | Test Equipment Voltage Reference |
Use Scenario: Providing stable 18 V bias for analog input front-end op-amps in modular PLC I/O modules. IC Role / Device Role / Timing Role: Low-drift voltage reference for signal conditioning stages requiring <1% absolute accuracy. Use Value: 2.5 Ω ZZ and 0.5 μA IR ensure minimal loading effect and negligible error contribution. | Use Scenario: Serving as calibration reference in handheld multimeters and benchtop power analyzers. IC Role / Device Role / Timing Role: Primary Zener reference element in precision voltage divider networks. Use Value: Stable VZ over –65 °C to +150 °C enables traceable measurements across environmental test chambers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5355B | Same 18 V, ±5%, 5 W rating but non-RoHS tin-lead plating; no TR8 tape-and-reel packaging | Not suitable for lead-free manufacturing; lacks reel packaging for SMT placement | Select 1N5355B only for legacy through-hole assembly where RoHS compliance is not required |
| MMBZ5245BS-7-F | Surface-mount SOD-123 package; 18 V, ±5%, 200 mW; higher ZZ (30 Ω) and lower IZM (10 mA) | Cannot replace 1N5355E3/TR8 in high-power regulation; limited to low-current biasing | Choose MMBZ5245BS-7-F only for space-constrained PCBs where power dissipation ≤200 mW suffices |
Compared with 1N5355B and MMBZ5245BS-7-F, the 1N5355E3/TR8 uniquely combines RoHS compliance, axial-leaded T-18 packaging for manual or wave-solder assembly, 5 W power handling, and 75 A surge capability-making it optimal for industrial-grade voltage regulation where reliability and thermal robustness are critical.
Availability
1N5355E3/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, programmable logic controller (PLC) modules, and test equipment requiring stable component supply with full RoHS compliance and tape-and-reel delivery.
Supply support for 1N5355E3/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 voltage regulation in harsh-environment power systems, emphasizing thermal stability, surge resilience, and long-term parametric consistency.
FAQ
What is the Zener voltage tolerance of the 1N5355E3/TR8?
The 1N5355E3/TR8 has a ±5% Zener voltage tolerance, consistent with the B-suffix designation in the 1N53xx family. This means its measured VZ falls between 17.1 V and 18.9 V when tested at 65 mA and 25 °C lead temperature. The e3 suffix confirms RoHS compliance but does not alter the tolerance specification, which is defined by the base part number's suffix structure per Microsemi documentation.
Does the 1N5355E3/TR8 require dry-packaging per J-STD-020?
No, the 1N5355E3/TR8 does not require dry-packaging. It carries IPC/JEDEC J-STD-020B moisture sensitivity level 1, meaning it can be stored indefinitely at ambient conditions without baking prior to soldering. This is enabled by its void-free thermosetting epoxy T-18 package, eliminating moisture ingress risk during reflow or wave soldering processes.
What is the maximum steady-state power dissipation for the 1N5355E3/TR8 on a standard FR4 PCB?
When mounted on a standard FR4 PCB (1 oz copper, 4 mm² pads, 1 mm track width, 25 mm length), the 1N5355E3/TR8 has a steady-state power rating of 1.47 W at 25 °C ambient temperature. This derated value reflects its 85 °C/W junction-to-ambient thermal resistance under those specific board conditions, as documented in Microsemi's datasheet Figure 1 and Maximum Ratings table.
Can the 1N5355E3/TR8 be used as a direct replacement for the 1N5355B?
Yes, the 1N5355E3/TR8 is electrically and mechanically identical to the 1N5355B except for RoHS compliance (e3 vs. non-e3 plating) and tape-and-reel packaging (TR8). Both share identical Zener voltage, tolerance, power rating, thermal resistance, and pinout. No PCB layout changes are needed, though solder profile must accommodate lead-free reflow if using the e3 version.
What is the reverse leakage current specification for the 1N5355E3/TR8?
The 1N5355E3/TR8 specifies a maximum reverse leakage current (IR) of 0.5 μA at 14.4 V - i.e., at 90% of its nominal 18 V Zener voltage. This parameter is measured under standard conditions (25 °C, specified test voltage), and confirms minimal off-state conduction critical for low-power bias networks and high-impedance reference applications.
1N5355E3/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:
- ±20%
- 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
1N5355E3/TR8 FAQ
1.How can I place an order for 1N5355E3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5355E3/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 1N5355E3/TR8 reliable?
The price and inventory of 1N5355E3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5355E3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5355E3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5355E3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5355E3/TR8?
1N5355E3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5355E3/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 1N5355E3/TR8?
For technical support, including 1N5355E3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5355E3/TR8 requirements.
6.How does Aetrix verify that 1N5355E3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5355E3/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 1N5355E3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5355E3/TR8?
All 1N5355E3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5355E3/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 1N5355E3/TR8 part is unused and in its original packaging.
Return procedure for 1N5355E3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5355E3/TR8 Tags
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