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Microchip Technology 1N5355AE3/TR8
- Part No.:
- 1N5355AE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5355AE3/TR8.pdf
- Description:
- DIODE ZENER 18V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,720
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Product details
Overview
1N5355AE3/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 18 V, ±10% tolerance (A suffix), 65 mA test current (IZT), 2.5 Ω maximum dynamic impedance (ZZ), and 75 mA maximum Zener current (IZM) at 25 °C lead temperature. It regulates voltage in power supply feedback loops, overvoltage protection circuits, and reference voltage generation for industrial power converters.
For engineers reviewing the 1N5355AE3/TR8 datasheet, 1N5355AE3/TR8 pinout, 1N5355AE3/TR8 application, or 1N5355AE3/TR8 equivalent, key selection criteria include its 18 V Zener voltage, ±10% tolerance, 5 W steady-state power rating at TL < 25 °C, low thermal resistance (25 °C/W junction-to-lead), and RoHS-compliant matte-tin plating per MIL-STD-750 Method 2026.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown to maintain stable voltage across its terminals under varying load and line conditions. Its regulation performance is defined by ΔVZ ≤ 0.40 V (measured between 10% and 50% of IZM) and ZZK ≤ 500 Ω at 1.0 mA.
Designed for axial-lead through-hole mounting on FR4 PCBs with 4 mm² copper pads, it delivers 5.5 W maximum steady-state power at TA = 25 °C when thermally optimized, and withstands non-recurrent 8.3 ms half-sine surge currents up to 75 A (IZSM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V nominal, ±10% tolerance - sets precise clamping threshold for overvoltage protection and reference circuits. |
| Test Current (IZT) | 65 mA - operating point at which VZ is specified; defines minimum bias current for stable regulation. |
| Max Dynamic Impedance (ZZ) | 2.5 Ω - low AC resistance ensures minimal output voltage variation under changing load current. |
| Max Zener Current (IZM) | 75 mA - maximum continuous DC current at TL = 25 °C; determines usable power envelope (P = VZ × IZM ≈ 1.35 W at worst-case VZ). |
| Power Dissipation | 5.0 W at TL < 25 °C (3/8″ lead length) - defines thermal design requirement for heatsinking or board layout. |
| Thermal Resistance | 25 °C/W junction-to-lead - enables direct thermal path modeling from die to PCB trace or heatsink. |
| Reverse Leakage (IR) | 0.5 µA max at VR = 14.4 V - ensures negligible standby current in high-impedance bias networks. |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by band; leads plated with RoHS-compliant annealed matte tin, 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 rail; forms return path during Zener operation. |
| Cathode | Zener breakdown terminal / Regulated output node | Banded end; connected to voltage source or feedback node; maintains stable 18 V relative to anode. |
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 - simplifies handling, storage, and assembly without baking preconditioning. |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Robust against electrostatic discharge during handling and PCB assembly without special precautions. |
| High surge current capability (75 A, 8.3 ms) | Withstands transient overvoltage events such as lightning-induced surges or inductive kickback. |
| RoHS-compliant (e3 suffix) | Meets EU Directive 2011/65/EU; uses lead-free matte-tin plating compatible with Pb-free reflow profiles. |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp for Industrial I/O |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated 48 V DC-DC converter to regulate output within ±1%. IC Role / Device Role / Timing Role: Voltage reference element setting error amplifier trip point; replaces precision shunt regulator where cost and simplicity are prioritized. Use Value: Provides stable 18 V reference with ΔVZ ≤ 0.40 V across 7.5–37.5 mA operating range, reducing output drift versus temperature. |
Use Scenario: Placed across 24 V PLC digital input channel to clamp transients exceeding 30 V. IC Role / Device Role / Timing Role: Passive overvoltage protector absorbing energy from inductive load switching or EFT bursts. Use Value: Limits voltage to safe level using 75 A surge rating and 2.5 Ω dynamic impedance, preventing damage to downstream logic inputs. |
| Programmable Voltage Reference | Field-Serviceable Sensor Excitation |
Use Scenario: Paired with resistor divider to generate adjustable 5–15 V reference for analog front-end calibration. IC Role / Device Role / Timing Role: Primary Zener element in two-resistor scaling network; selected for tight thermal coefficient and low ZZ. Use Value: Delivers 18 V base reference with ±10% tolerance and 0.40 V regulation delta, enabling predictable scaling accuracy. |
Use Scenario: Supplies excitation voltage to 4–20 mA pressure transmitter in hazardous-area instrumentation. IC Role / Device Role / Timing Role: Stable bias source tolerant of ambient temperature swings from −40 °C to +85 °C. Use Value: Maintains regulation over full industrial temperature range (−65 °C to +150 °C) with minimal VZ drift due to low thermal resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5355B | Same 18 V nominal VZ, but ±5% tolerance (B suffix) and higher IZM (75 mA vs. same value, but tighter VZ spec enables improved accuracy in feedback paths). | Preferred where tighter regulation stability is required, e.g., precision power supply feedback with <±0.5% output tolerance. | Select 1N5355B when ±5% VZ tolerance is needed; both share identical package, thermal specs, and RoHS compliance. |
| MMBZ5245B (SOT-23) | Surface-mount 18 V Zener, 0.35 W rating, ±5% tolerance, 20 mA IZT - significantly lower power and different package. | Suitable only for low-power signal-level clamping or biasing; not interchangeable for 5 W thermal loads. | Choose MMBZ5245B only for space-constrained PCBs where power dissipation ≤ 350 mW is sufficient. |
Compared with 1N5355B and MMBZ5245B, the 1N5355AE3/TR8 offers the highest power handling (5 W) and axial-lead mechanical robustness for industrial through-hole designs, while trading tolerance for cost and legacy compatibility.
Availability
1N5355AE3/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, programmable logic controller (PLC) input protection, field-serviceable sensor interfaces, and ruggedized embedded control systems requiring stable component supply and long-term obsolescence management.
Supply support for 1N5355AE3/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xx series was developed for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal resilience, surge immunity, and JEDEC-standardized form factor for legacy and new-design compatibility.
FAQ
What is the Zener voltage tolerance of the 1N5355AE3/TR8?
The 1N5355AE3/TR8 has a Zener voltage tolerance of ±10%, indicated by the "A" suffix in its part number. This means its actual breakdown voltage falls between 16.2 V and 19.8 V at 65 mA test current and 25 °C lead temperature. The "e3" suffix confirms RoHS compliance, and "TR8" denotes tape-and-reel packaging per EIA-296 standard. This tolerance is suitable for non-critical regulation tasks where cost and availability outweigh precision requirements.
Can the 1N5355AE3/TR8 be used in surface-mount designs?
No, the 1N5355AE3/TR8 is an axial-leaded T-18 package device intended for through-hole mounting only. It lacks SMD-compatible terminations or footprint. For surface-mount equivalents, Microsemi offers the SMBJ5355B (DO-214AA) and SMBG5355B (DO-214AB), both rated for 5 W and sharing the same 18 V ±10% specification. These require separate PCB layout and thermal validation but provide identical electrical regulation behavior.
What is the maximum surge current rating for the 1N5355AE3/TR8?
The 1N5355AE3/TR8 is rated for a maximum non-recurrent surge current (IZSM) of 75 A, defined as the peak of an 8.3 ms half-sine waveform. This rating assumes proper lead termination and adequate PCB copper area for heat dissipation. Exceeding this value-even briefly-may cause irreversible junction damage. Surge testing must follow JEDEC JESD22-A114 standards using calibrated waveforms.
How does thermal resistance affect the 1N5355AE3/TR8's power handling?
The 1N5355AE3/TR8 has a junction-to-lead thermal resistance of 25 °C/W. When mounted with 3/8″ (10 mm) lead length from body, it can safely dissipate 5.0 W at TL = 25 °C. On a standard FR4 board (1 oz Cu, 4 mm² pad), junction-to-ambient resistance rises to 85 °C/W, limiting steady-state power to 1.47 W at TA = 25 °C. Derating curves in the datasheet must be applied for elevated ambient temperatures.
Is the 1N5355AE3/TR8 suitable for automotive applications?
The 1N5355AE3/TR8 meets AEC-Q200 stress test requirements only when screened to JAN, JANTX, or JANTXV levels (via MQ/MX/MV prefixes). As shipped (standard commercial grade), it supports industrial temperature range (−65 °C to +150 °C) but lacks automotive qualification documentation. For automotive use, specify 1N5355AE3/TR8 with appropriate military prefix or select Microchip's AEC-Q200-qualified Zener portfolio.
1N5355AE3/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:
- ±10%
- 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
1N5355AE3/TR8 FAQ
1.How can I place an order for 1N5355AE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5355AE3/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 1N5355AE3/TR8 reliable?
The price and inventory of 1N5355AE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5355AE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5355AE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5355AE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5355AE3/TR8?
1N5355AE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5355AE3/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 1N5355AE3/TR8?
For technical support, including 1N5355AE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5355AE3/TR8 requirements.
6.How does Aetrix verify that 1N5355AE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5355AE3/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 1N5355AE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5355AE3/TR8?
All 1N5355AE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5355AE3/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 1N5355AE3/TR8 part is unused and in its original packaging.
Return procedure for 1N5355AE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5355AE3/TR8 Tags
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