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Microchip Technology 1N5356B/TR8
- Part No.:
- 1N5356B/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5356B/TR8.pdf
- Description:
- DIODE ZENER 19V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:2,211
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Product details
Overview
1N5356B/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 19 V ±5%, 65 mA test current (IZT), 3.0 Ω maximum dynamic impedance (ZZ), and 75 mA maximum regulator current (IZM) at TL = 25°C. It provides stable voltage reference in power supply feedback, overvoltage protection, and precision biasing circuits.
For engineers reviewing the 1N5356B/TR8 datasheet, 1N5356B/TR8 pinout, 1N5356B/TR8 application, or 1N5356B/TR8 equivalent, this page delivers verified electrical specs, thermal derating behavior, JEDEC T-18 package details, and direct alternatives for industrial power regulation design.
Technical Context
The 1N5356B/TR8 operates as a two-terminal voltage reference device, conducting in reverse breakdown to maintain a stable 19 V across its terminals within ±5% tolerance. Its regulation performance is defined at 65 mA test current and validated under lead temperature (TL) conditions per JEDEC standards.
It features 3.0 Ω dynamic impedance at IZT, 0.5 μA maximum reverse leakage at VR = 14.4 V, and 5.3 V maximum voltage regulation (ΔVZ) between 10% and 50% of IZM - confirming tight regulation over operating current range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19 V ±5% - precise reference for 18–19.9 V regulated output |
| Test Current (IZT) | 65 mA - defines nominal operating point for VZ and ZZ measurement |
| Dynamic Impedance (ZZ) | 3.0 Ω max - low AC resistance ensures minimal voltage shift under load transients |
| Max Regulator Current (IZM) | 75 mA - maximum continuous DC current before thermal limit at TL = 25°C |
| Reverse Leakage (IR) | 0.5 μA max at VR = 14.4 V - negligible standby power loss in high-impedance bias networks |
| Voltage Regulation (ΔVZ) | 5.3 V max - difference between VZ measured at 7.5 mA and 37.5 mA confirms stability across 10–50% IZM range |
| Power Dissipation | 5.0 W at TL = 25°C - requires minimum 3/8″ (10 mm) lead length from body for full rating |
| Thermal Resistance | 25 °C/W junction-to-lead - enables thermal modeling for heatsink-free operation with adequate lead length |
Pinout & Package
Package: JEDEC T-18 axial-leaded plastic encapsulated case (void-free thermosetting epoxy, UL94V-0 rated). Cathode indicated by band; banded end must be held positive relative to anode during regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or lower-potential rail; forms return path for Zener current |
| Cathode | Regulated output node | Banded terminal; held at stable 19 V above anode when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| ±5% voltage tolerance (B suffix) | Enables accurate 19 V reference without post-calibration in mid-precision supplies |
| RoHS-compliant (e3 suffix) | Meets environmental compliance for industrial and commercial PCB assembly without lead exemption |
| Moisture sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out prior to reflow |
| 25 °C/W junction-to-lead thermal resistance | Supports 5 W operation with standard lead-forming and chassis-mount heat sinking |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for special ESD handling during manual assembly or board-level testing |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated 24 V DC-DC converter to regulate output voltage. IC Role / Device Role / Timing Role: Zener diode serves as primary voltage reference for TL431-like shunt regulator circuit. Use Value: 19 V nominal VZ aligns with common 24 V rail +5% margin, enabling stable regulation despite line/load variation. | Use Scenario: Placed across motor driver H-bridge supply rail to clamp transient spikes during inductive kickback. IC Role / Device Role / Timing Role: Two-terminal passive clamp absorbing energy during flyback events. Use Value: 75 mA IZM and 5 W rating allow safe dissipation of short-duration surges without degradation. |
| Precision Bias Network | Industrial Sensor Excitation |
Use Scenario: Provides stable 19 V bias to op-amp input stage in analog signal conditioning module for strain gauge bridge. IC Role / Device Role / Timing Role: Voltage reference element establishing fixed common-mode level for differential amplification. Use Value: 3.0 Ω ZZ minimizes current-induced error, supporting <0.1% gain accuracy in 12-bit systems. | Use Scenario: Supplies excitation voltage to 350 Ω RTD sensor in temperature transmitter with 4–20 mA output. IC Role / Device Role / Timing Role: Stable DC reference source powering Wheatstone bridge configuration. Use Value: ±5% tolerance and low ΔVZ ensure consistent sensor sensitivity across temperature and supply drift. |
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 (bulk) | Identical electrical specs; differs only in packaging - no tape-and-reel (TR8) carrier | No automated pick-and-place support; suitable for hand-soldered prototypes or low-volume repair | Select 1N5356B/TR8 for SMT production lines requiring reel-fed placement; choose bulk for bench validation. |
| MMBZ5248BS-7-F | Surface-mount SOD-123 package; 19 V ±5%, 20 mA IZT, 35 Ω ZZ - higher impedance, lower power (0.5 W) | Not suitable for 5 W dissipation; limited to low-current bias/reference roles in space-constrained designs | Choose MMBZ5248BS-7-F only when board area is critical and power demand ≤0.5 W; retain 1N5356B/TR8 for >1 W regulation. |
Compared with 1N5356B (bulk) and MMBZ5248BS-7-F, the 1N5356B/TR8 uniquely combines JEDEC-standard axial T-18 packaging, 5 W power handling, ±5% tolerance, and EIA-296 tape-and-reel compatibility - making it optimal for high-reliability industrial power supply manufacturing.
Availability
1N5356B/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and precision bias networks requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N5356B/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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N53xxB series belongs to Microsemi's legacy silicon Zener diode product line, engineered for robust voltage regulation in harsh-environment power systems where thermal stability, surge resilience, and long-term parametric consistency are critical.
FAQ
What is the Zener voltage tolerance of the 1N5356B/TR8?
The 1N5356B/TR8 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix in its part number. This means its nominal 19 V regulation falls within 18.05 V to 19.95 V at 65 mA test current and TL = 25°C. The tolerance is guaranteed per JEDEC registration and confirmed in Microsemi's official datasheet revision D (2008).
Can the 1N5356B/TR8 be used in surface-mount designs?
No - the 1N5356B/TR8 uses a JEDEC T-18 axial-leaded package and is not a surface-mount device. For SMT equivalents, Microsemi offers the SMBJ5356B or SMBG5356B in DO-214AA/DO-214AB packages. The 1N5356B/TR8 requires through-hole mounting with ≥10 mm lead length from body for full 5 W rating.
What is the maximum surge current rating for the 1N5356B/TR8?
The 1N5356B/TR8 has a maximum non-recurrent surge current (IZSM) of 170 A, specified for a single 8.3 ms half-sine waveform. This rating reflects its ability to absorb transient energy during inductive switching events, provided the average power remains within thermal limits defined by the derating curve in Figure 1 of the datasheet.
How does the thermal resistance affect the 1N5356B/TR8's power handling?
The 1N5356B/TR8 has a junction-to-lead thermal resistance of 25 °C/W when mounted with 3/8″ (10 mm) lead length from body. This allows full 5 W dissipation at TL = 25°C. On FR4 PCB with 1 oz copper, junction-to-ambient resistance rises to 85 °C/W, reducing steady-state power to 1.47 W at TA = 25°C - requiring careful thermal layout if ambient operation exceeds 25°C.
Is the 1N5356B/TR8 RoHS compliant?
Yes - the "e3" designation in the full part marking (1N5356B/TR8 e3) confirms RoHS compliance per EU Directive 2011/65/EU. The device uses annealed matte-tin plating on leads and void-free UL94V-0 epoxy encapsulation, meeting all substance restrictions without exemptions.
1N5356B/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:
- ±5%
- 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
1N5356B/TR8 FAQ
1.How can I place an order for 1N5356B/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5356B/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 1N5356B/TR8 reliable?
The price and inventory of 1N5356B/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5356B/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5356B/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5356B/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5356B/TR8?
1N5356B/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5356B/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 1N5356B/TR8?
For technical support, including 1N5356B/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5356B/TR8 requirements.
6.How does Aetrix verify that 1N5356B/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5356B/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 1N5356B/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5356B/TR8?
All 1N5356B/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5356B/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 1N5356B/TR8 part is unused and in its original packaging.
Return procedure for 1N5356B/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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