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Microchip Technology 1N5357B/TR8
- Part No.:
- 1N5357B/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5357B/TR8.pdf
- Description:
- DIODE ZENER 20V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:9,495
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Product details
Overview
1N5357B/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 20 V ±5%, 3.0 Ω maximum dynamic impedance at 65 mA test current, 75 mA maximum Zener current (IZM), and 0.40 V maximum voltage regulation (ΔVZ) across 10–50% IZM. 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 1N5357B/TR8 datasheet, 1N5357B/TR8 pinout, 1N5357B/TR8 application, or 1N5357B/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (5.1 A), moisture sensitivity level (Level 1), and RoHS-compliant e3 marking compatibility.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown mode. Its Zener voltage is specified at 20 V with ±5% tolerance (B suffix), measured at 65 mA DC test current (IZT) with 40 ±10 ms stabilization time, and exhibits 3.0 Ω dynamic impedance (ZZ) under those conditions.
Thermal design relies on junction-to-lead thermal resistance of 25 °C/W at 3/8″ (10 mm) lead length, enabling 5.0 W steady-state dissipation at TL < 25 °C. At ambient mounting on FR4 (1 oz Cu, 4 mm² pad), derated power drops to 1.47 W due to 85 °C/W junction-to-ambient resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V ±5% - stable regulation point for feedback loops and reference circuits |
| Test Current (IZT) | 65 mA - defined operating point for VZ and impedance measurement |
| Dynamic Impedance (ZZ) | 3.0 Ω max - low AC resistance ensures minimal voltage shift under load transients |
| Max Zener Current (IZM) | 75 mA - maximum continuous DC current at rated power with adequate heat sinking |
| Voltage Regulation (ΔVZ) | 0.40 V max - difference between VZ at 10% and 50% of IZM, indicating regulation linearity |
| Surge Current (IZSM) | 5.1 A peak - non-repetitive 8.3 ms half-sine capability for transient suppression |
| Thermal Resistance (RθJL) | 25 °C/W - enables 5 W operation when leads are held at ≤25 °C (e.g., chassis-mounted) |
Pinout & Package
Package: Axial-leaded T-18 plastic case per JEDEC DO-204AL. Cathode indicated by band; diode operated with banded end positive relative to unbanded end. Moisture sensitivity Level 1 - no dry pack required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Current sink in reverse bias | Connected to lower-potential node (e.g., ground or return path) during regulation |
| Cathode (banded end) | Regulated output node | Provides stable 20 V reference when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance (B suffix) | Enables tighter feedback loop control vs. ±10% or ±20% variants without requiring trimming |
| Low dynamic impedance (3.0 Ω) | Minimizes output voltage variation under changing load currents in shunt regulator topologies |
| JEDEC DO-204AL (T-18) package | Supports through-hole mounting with standardized lead spacing and mechanical robustness |
| RoHS-compliant e3 marking option | Meets environmental compliance requirements for industrial and commercial PCB assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for special handling or on-board ESD protection during board assembly |
Applications
| Industrial Power Supply Reference | Overvoltage Clamp in DC-DC Converters |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback or forward converter secondary-side regulation. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 20 V setpoint to optocoupler or error amplifier input. Use Value: Maintains ±1% output regulation across line/load variations due to tight 20 V ±5% tolerance and low ΔVZ. | Use Scenario: Protecting MOSFET gate drivers or controller ICs from transient overvoltage events. IC Role / Device Role / Timing Role: Clamping circuit element that conducts above 20 V to divert excess energy to ground. Use Value: Withstands 5.1 A surge (8.3 ms) without degradation, preserving downstream component integrity. |
| Programmable Voltage Monitor Threshold | Temperature-Stable Bias Network |
Use Scenario: Setting trip point for comparator-based undervoltage/overvoltage detection circuits. IC Role / Device Role / Timing Role: Precision voltage source defining comparator reference against which system rail is compared. Use Value: Delivers stable 20 V reference over –65 °C to +150 °C, minimizing thermal drift-induced false triggers. | Use Scenario: Establishing fixed bias points for linear regulators or op-amp input stages. IC Role / Device Role / Timing Role: Low-impedance DC voltage source maintaining constant node potential independent of supply ripple. Use Value: 3.0 Ω dynamic impedance ensures <10 mV ripple transmission into high-impedance bias networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5357B (bulk) | No TR8 tape-and-reel packaging; same electrical specs and T-18 package | Preferred for manual prototyping or low-volume hand-soldered assemblies | Select 1N5357B/TR8 for automated SMT placement; choose bulk 1N5357B for bench testing or repair |
| MMBZ5248B (SOT-23) | Surface-mount package, 0.5 W rating, 20 V ±5%, higher ZZ (30 Ω) | Suitable only for low-power signal-level clamping, not 5 W regulation | Use MMBZ5248B only where board space is constrained and power dissipation ≤0.5 W |
Compared with 1N5357B/TR8, the bulk version offers identical performance without tape-and-reel logistics, while MMBZ5248B trades power handling and impedance for miniaturization-making it unsuitable as a direct replacement in high-current regulation roles.
Availability
1N5357B/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and programmable voltage monitors requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N5357B/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 belongs to Microsemi's legacy silicon Zener diode product line, engineered for ruggedized voltage regulation in harsh-environment power systems where thermal stability and surge resilience are critical.
FAQ
What is the Zener voltage tolerance of the 1N5357B/TR8?
The 1N5357B/TR8 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix in its part number. This means its actual regulation voltage falls within 19.0 V to 21.0 V at 65 mA test current and 25 °C lead temperature. The tolerance is guaranteed per JEDEC registration and verified during 100% lot testing.
Can the 1N5357B/TR8 be used in surface-mount designs?
No, the 1N5357B/TR8 uses an axial-leaded T-18 (DO-204AL) package and is not a surface-mount device. For SMT equivalents, Microsemi offers the SMBJ5357B in SMB package or SMBG5357B in SMBG variant-both rated for 5 W but requiring different PCB footprints and reflow profiles than the 1N5357B/TR8.
What is the maximum power dissipation of the 1N5357B/TR8 at ambient temperature?
When mounted on a standard FR4 PCB (1 oz copper, 4 mm² pad), the 1N5357B/TR8 is rated for 1.47 W at 25 °C ambient due to its 85 °C/W junction-to-ambient thermal resistance. Full 5.0 W operation requires maintaining lead temperature below 25 °C via chassis mounting or heatsinking, per the 25 °C/W junction-to-lead spec.
Does the 1N5357B/TR8 meet RoHS requirements?
Yes-the "e3" suffix in the full manufacturer designation confirms RoHS compliance. The 1N5357B/TR8 uses annealed matte-tin plating on leads and void-free UL94V-0 epoxy encapsulation, satisfying EU Directive 2011/65/EU and related exemptions. No lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE substances exceed threshold limits.
How is polarity marked on the 1N5357B/TR8?
The 1N5357B/TR8 uses a cathode band to indicate polarity: the banded end is the cathode and must be connected to the higher-potential node (e.g., positive rail) when used in reverse-bias regulation mode. The unbanded end is the anode and connects to the lower-potential node (e.g., ground). This marking follows JEDEC DO-204AL standard and is laser-etched or molded into the epoxy body.
1N5357B/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):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 3 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 14.4 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
1N5357B/TR8 FAQ
1.How can I place an order for 1N5357B/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5357B/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 1N5357B/TR8 reliable?
The price and inventory of 1N5357B/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5357B/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5357B/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5357B/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5357B/TR8?
1N5357B/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5357B/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 1N5357B/TR8?
For technical support, including 1N5357B/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5357B/TR8 requirements.
6.How does Aetrix verify that 1N5357B/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5357B/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 1N5357B/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5357B/TR8?
All 1N5357B/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5357B/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 1N5357B/TR8 part is unused and in its original packaging.
Return procedure for 1N5357B/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5357B/TR8 Tags
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