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Microchip Technology 1N5355BE3/TR8
- Part No.:
- 1N5355BE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5355BE3/TR8.pdf
- Description:
- DIODE ZENER 18V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:3,943
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Product details
Overview
1N5355BE3/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 18 V, ±5% tolerance (B 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 1N5355BE3/TR8 datasheet, 1N5355BE3/TR8 pinout, 1N5355BE3/TR8 application, or 1N5355BE3/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 operating in reverse breakdown. Its regulation performance is specified at 25 °C lead temperature with 65 mA test current, and it maintains stable output across 10–50% of IZM with ΔVZ ≤ 0.40 V. The low 25 °C/W thermal resistance enables high-power operation when mounted with 3/8″ (10 mm) lead length from body.
It exhibits 0.5 μA maximum reverse leakage at VR = 14.4 V (90% of VZ), and its dynamic knee impedance (ZZK) is ≤ 2.5 Ω at 1.0 mA. The device is moisture-sensitive Level 1 per J-STD-020B and requires no dry pack.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V ±5% - precise regulation point for feedback networks and reference circuits |
| Test Current (IZT) | 65 mA - defined operating point for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 2.5 Ω max - low AC impedance ensures minimal voltage shift under varying load currents |
| Max Regulator Current (IZM) | 75 mA - maximum continuous DC current before thermal derating begins |
| 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 surge (8.3 ms) capability for transient suppression |
| Thermal Resistance (RθJL) | 25 °C/W - junction-to-lead resistance enables 5 W dissipation with adequate heatsinking at TL < 25°C |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC DO-204AL; void-free UL94V-0 epoxy body; cathode indicated by band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side in Zener mode | Connected to circuit ground or lower potential node during reverse-bias regulation |
| Cathode | Zener breakdown terminal / high-voltage side in Zener mode | Banded end; connected to unregulated input or feedback node; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Guarantees mechanical and electrical interchangeability across 1N53xxB series |
| ±5% voltage tolerance (B suffix) | Enables tighter feedback loop control vs. ±10% (A) or ±20% (no suffix) variants |
| RoHS-compliant e3 suffix | Meets EU Directive 2011/65/EU with matte-tin plating and lead-free assembly compatibility |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and floor-life constraints for SMT reflow prep |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Withstands handling without special ESD controls in standard assembly environments |
Applications
| Switching Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Integrated into optocoupler feedback network of isolated DC-DC converter to regulate 12 V output. IC Role / Device Role / Timing Role: Precision voltage reference setting error amplifier trip point. Use Value: 18 V Zener voltage provides headroom above 12 V rail while maintaining tight ±5% regulation for ±1% output accuracy. | Use Scenario: Placed across motor driver H-bridge supply rail to clamp transients during inductive kickback. IC Role / Device Role / Timing Role: Passive overvoltage protection element absorbing energy during flyback events. Use Value: 75 A surge rating and 0.40 V ΔVZ ensure clamping stability under repetitive 50–100 ns spikes without parameter drift. |
| Programmable Reference Source | Industrial Sensor Excitation |
Use Scenario: Paired with resistor divider to generate adjustable 5–10 V reference for ADC front-end in PLC analog input module. IC Role / Device Role / Timing Role: Stable shunt reference establishing known bias point for ratiometric measurements. Use Value: Low 2.5 Ω ZZ and –65°C to +150°C operating range maintain reference accuracy across industrial temperature extremes. | Use Scenario: Supplies regulated excitation voltage to 350 Ω strain gauge bridge in weigh scale transducer interface. IC Role / Device Role / Timing Role: Constant-current source via series resistor + Zener shunt configuration. Use Value: 65 mA IZT and 75 mA IZM support ≥20 mA bridge drive with <0.1% line regulation error over 10–30 V input variation. |
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 (non-e3, non-TR8) | Same electrical specs but SnPb plating and bulk packaging; not RoHS-compliant | Limited to legacy industrial or military programs exempt from RoHS | Select only if RoHS exemption applies and tape-and-reel is unnecessary |
| MMSZ5245B-TP (Micro Commercial Components) | Surface-mount SOD-123 package; 18 V ±5%; 20 mA IZT; 350 mW Pd; higher ZZ (20 Ω) | Not drop-in; requires PCB redesign; suited for space-constrained consumer designs | Choose for high-volume automated assembly where board space > power rating priority |
Compared with 1N5355BE3/TR8, the 1N5355B lacks RoHS compliance and tape-and-reel packaging, limiting modern production use; the MMSZ5245B-TP trades 5 W power handling and axial mounting flexibility for miniaturization-making it unsuitable for high-energy clamping or through-hole prototyping.
Availability
1N5355BE3/TR8 is available at Aetrix Electronics and suitable for switching power supplies, overvoltage protection circuits, and programmable reference sources requiring stable component supply, long-lifecycle support, and RoHS-compliant procurement.
Supply support for 1N5355BE3/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 1N53xxB series was designed for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and long-term parametric stability under extended temperature cycling.
FAQ
What is the Zener voltage tolerance of the 1N5355BE3/TR8?
The 1N5355BE3/TR8 has a Zener voltage tolerance of ±5%, indicated by the "B" suffix in its part number. This means its nominal 18 V regulation voltage falls within 17.1 V to 18.9 V at 25 °C lead temperature and 65 mA test current. The tolerance remains valid across the full operating temperature range of –65°C to +150°C, as confirmed in Microsemi's official datasheet revision D.
Does the 1N5355BE3/TR8 require dry packing before reflow soldering?
No, the 1N5355BE3/TR8 does not require dry packing. It carries IPC/JEDEC J-STD-020B moisture sensitivity level 1, meaning it is not moisture-sensitive and may be stored and processed without baking or humidity-controlled packaging. This simplifies handling and eliminates floor-life tracking for the 1N5355BE3/TR8 in standard SMT assembly lines.
What is the maximum steady-state power dissipation for the 1N5355BE3/TR8 on a standard FR4 PCB?
When mounted on a standard FR4 PCB (1 oz copper) with 4 mm² copper pads and 1 mm track width, the 1N5355BE3/TR8 has a steady-state power dissipation limit of 1.47 W at 25 °C ambient temperature. This derates linearly above 25 °C per the published thermal resistance of 85 °C/W junction-to-ambient, distinct from its 5 W rating at 25 °C lead temperature with proper heatsinking.
Can the 1N5355BE3/TR8 be used as a replacement for the 1N5355B without design changes?
Yes-the 1N5355BE3/TR8 is a direct functional and mechanical replacement for the 1N5355B. Both share identical electrical specifications, T-18 package dimensions, and axial lead configuration. The "e3" suffix adds RoHS compliance, and "TR8" denotes tape-and-reel packaging; no PCB layout or schematic changes are needed when upgrading from 1N5355B to 1N5355BE3/TR8.
What is the reverse leakage current specification for the 1N5355BE3/TR8?
The 1N5355BE3/TR8 specifies a maximum reverse leakage current (IR) of 0.5 μA at VR = 14.4 V, which is 90% of its nominal 18 V Zener voltage. This value is measured at 25 °C and reflects the device's ability to hold off voltage with minimal parasitic current-critical for low-power reference and high-impedance sensing applications where leakage could introduce offset errors.
1N5355BE3/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:
- ±5%
- 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
1N5355BE3/TR8 FAQ
1.How can I place an order for 1N5355BE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5355BE3/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 1N5355BE3/TR8 reliable?
The price and inventory of 1N5355BE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5355BE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5355BE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5355BE3/TR8 transactions.
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4.How is shipping managed for 1N5355BE3/TR8?
1N5355BE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5355BE3/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 1N5355BE3/TR8?
For technical support, including 1N5355BE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5355BE3/TR8 requirements.
6.How does Aetrix verify that 1N5355BE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5355BE3/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 1N5355BE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5355BE3/TR8?
All 1N5355BE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5355BE3/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 1N5355BE3/TR8 part is unused and in its original packaging.
Return procedure for 1N5355BE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5355BE3/TR8 Tags
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