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Microchip Technology 1N5356/TR8
- Part No.:
- 1N5356/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5356/TR8.pdf
- Description:
- DIODE ZENER 19V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:7,177
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Product details
Overview
1N5356/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 19 V, ±5% tolerance (B suffix), 65 mA test current (IZT), 3.0 Ω 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 1N5356/TR8 datasheet, 1N5356/TR8 pinout, 1N5356/TR8 application, or 1N5356/TR8 equivalent, key selection criteria include its 19 V Zener voltage, 5 W steady-state power rating at TL < 25°C, 25 °C/W junction-to-lead thermal resistance, and RoHS-compliant matte-tin plating per MIL-STD-750 Method 2026.
Technical Context
This device operates as a reverse-biased voltage reference with specified regulation over 10–50% of IZM (7.5–37.5 mA), exhibiting ΔVZ ≤ 0.40 V across that range. Its low 3.0 Ω dynamic impedance at IZT = 65 mA ensures stable output under varying load conditions.
The 1N5356/TR8 features a T-18 axial package with cathode band marking, void-free UL94V-0 epoxy body, and is rated for -65°C to +150°C operating temperature. It withstands 8.3 ms non-repetitive surge currents up to 75 A and maintains <0.5 μA reverse leakage at VR = 14.4 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19 V ±5% - precise regulation point for feedback and clamping at nominal 19 V |
| Test Current (IZT) | 65 mA - operating point where VZ and ZZ are guaranteed per JEDEC spec |
| Dynamic Impedance (ZZ) | 3.0 Ω - low AC resistance ensures minimal voltage shift under dynamic load changes |
| Max Zener Current (IZM) | 75 mA - maximum continuous DC current at TL = 25°C with adequate heat sinking |
| Power Dissipation | 5.0 W at TL < 25°C - requires 3/8" (10 mm) lead length from body for full rating |
| Thermal Resistance | 25 °C/W junction-to-lead - enables thermal design with discrete lead-mounting and heatsinking |
| Voltage Regulation (ΔVZ) | 0.40 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case (UL94V-0 epoxy), cathode indicated by colored band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; reverse bias applied to cathode |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; connected to regulated node or error amplifier input; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 5 W Zener | Guaranteed compliance with industry-standard electrical and mechanical specifications for 1N-series devices |
| ±5% voltage tolerance (B suffix) | Enables tighter regulation than ±10% (A) or ±20% (no suffix) variants in precision references |
| Level 1 moisture sensitivity | No dry pack required before PCB assembly-reduces handling cost and process steps |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for special ESD handling during manufacturing and testing |
| RoHS-compliant (e3 suffix) | Meets EU Directive 2011/65/EU with lead-free matte-tin plating and halogen-free epoxy |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Used in the optocoupler feedback path of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference element providing stable 19 V threshold to drive optocoupler LED. Use Value: Maintains ±1% output regulation over line/load/temperature due to low ΔVZ (0.40 V) and stable IZT operation. | Use Scenario: Placed across sensitive IC inputs or bus lines to limit transient overvoltage events. IC Role / Device Role / Timing Role: Shunt clamping device diverting surge energy above 19 V to ground. Use Value: Withstands 75 A 8.3 ms surge (IZSM) without degradation, protecting downstream logic from >20 V transients. |
| Industrial Sensor Reference | Programmable Voltage Monitor |
Use Scenario: Supplies stable excitation voltage to resistive bridge sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Precision voltage reference source for ratiometric sensor signal conditioning. Use Value: Delivers 19 V ±5% with <0.5 μA IR at 14.4 V, minimizing sensor bias current error and self-heating drift. | Use Scenario: Configured with comparator to trigger fault shutdown when system rail exceeds 19 V threshold. IC Role / Device Role / Timing Role: Threshold-setting element defining trip point for undervoltage/overvoltage detection. Use Value: Enables accurate 19 V monitoring with 3.0 Ω ZZ ensuring minimal hysteresis and fast response to overvoltage onset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5356B | Same 19 V ±5%, 5 W rating, but in bulk (non-tape-and-reel) packaging; no TR8 designation | Requires manual loading or tube-based automation; not optimized for high-speed pick-and-place | Select 1N5356/TR8 for automated SMT assembly; choose 1N5356B for prototyping or low-volume hand-soldered builds |
| MMBZ5242B | Surface-mount SOT-23 package, same 19 V ±5%, but rated for only 0.225 W; higher ZZ (30 Ω) | Not suitable for 5 W dissipation; limited to low-power bias/reference roles in space-constrained designs | Use MMBZ5242B only where board area is critical and power < 200 mW; retain 1N5356/TR8 for full 5 W capability and thermal robustness |
Compared with 1N5356B and MMBZ5242B, the 1N5356/TR8 uniquely combines JEDEC-standard axial form factor, 5 W power handling, tape-and-reel delivery for automated placement, and verified surge robustness-making it optimal for industrial power supply and protection applications requiring reliability and manufacturability.
Availability
1N5356/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and sensor reference designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N5356/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 specifically for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal stability, surge immunity, and long-term parametric consistency under extended temperature cycling.
FAQ
What is the Zener voltage tolerance of the 1N5356/TR8?
The 1N5356/TR8 has a Zener voltage tolerance of ±5%, indicated by the "B" suffix in its part number. This means its actual regulation voltage falls within 18.05 V to 19.95 V at 65 mA test current and 25°C lead temperature. The tolerance is guaranteed per JEDEC specification and applies across the full operating temperature range of -65°C to +150°C, making the 1N5356/TR8 suitable for applications requiring tighter regulation than standard ±10% Zeners.
Can the 1N5356/TR8 be used in surface-mount designs?
No, the 1N5356/TR8 is an axial-leaded T-18 package device and is not compatible with surface-mount assembly processes. It requires through-hole mounting with 3/8" (10 mm) lead length from the body for full 5 W power rating. For surface-mount equivalents, Microsemi offers the SMBJ5356B (DO-214AA) and SMBG5356B (DO-214AB), both rated for 5 W but with different thermal profiles and footprint requirements than the 1N5356/TR8.
What is the maximum surge current rating for the 1N5356/TR8?
The 1N5356/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 wave. This rating assumes proper PCB layout with adequate copper pour and thermal relief. The surge capability allows the 1N5356/TR8 to absorb transient overvoltages in industrial environments without failure, supporting its use in clamping and protection circuits where lightning-induced or inductive-switching spikes occur.
Does the 1N5356/TR8 require dry packing before reflow soldering?
No, the 1N5356/TR8 has IPC/JEDEC J-STD-020B moisture sensitivity level (MSL) 1, meaning it is not moisture-sensitive and does not require dry packing or baking prior to soldering. Its void-free thermosetting epoxy body and Level 1 classification eliminate moisture-related popcorning risks during reflow, simplifying manufacturing flow and reducing handling overhead compared to higher-MSL components.
How does the thermal resistance of the 1N5356/TR8 affect its power derating?
The 1N5356/TR8 has a junction-to-lead thermal resistance of 25 °C/W when mounted with 3/8" (10 mm) lead length from the body. This means each watt dissipated raises the junction temperature 25°C above lead temperature. At lead temperatures above 25°C, power must be linearly derated-e.g., at TL = 75°C, max power drops to 3.75 W. Proper heatsinking of the leads is essential to maintain the 5 W rating, and the 1N5356/TR8's thermal profile differs significantly from FR4-board-mounted ratings (85 °C/W).
1N5356/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):
- 19 V
- Tolerance:
- ±20%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 3 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 13.7 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
1N5356/TR8 FAQ
1.How can I place an order for 1N5356/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5356/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 1N5356/TR8 reliable?
The price and inventory of 1N5356/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5356/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5356/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5356/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5356/TR8?
1N5356/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5356/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 1N5356/TR8?
For technical support, including 1N5356/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5356/TR8 requirements.
6.How does Aetrix verify that 1N5356/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5356/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 1N5356/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5356/TR8?
All 1N5356/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5356/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 1N5356/TR8 part is unused and in its original packaging.
Return procedure for 1N5356/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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