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Microchip Technology 1N5357/TR8
- Part No.:
- 1N5357/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5357/TR8.pdf
- Description:
- DIODE ZENER 20V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,291
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Product details
Overview
1N5357/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 20 V, ±5% tolerance (B suffix), 3.0 Ω dynamic impedance at 65 mA test current, and maximum reverse current of 0.5 μA at 15.2 V. 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 1N5357/TR8 datasheet, 1N5357/TR8 pinout, 1N5357/TR8 application, or 1N5357/TR8 equivalent, key selection factors include its 20 V Zener voltage, 5 W steady-state power rating at lead temperature <25°C, low 0.40 V voltage regulation (ΔVZ), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage regulator in reverse-biased mode, maintaining stable output voltage across wide operating current (65 mA IZT to 75 mA IZM) and temperature ranges. Its 25 °C/W junction-to-lead thermal resistance enables reliable 5 W operation with minimal heatsinking when leads are trimmed to 10 mm.
The 1N5357/TR8 exhibits low dynamic impedance (3.0 Ω) and tight voltage regulation (0.40 V ΔVZ), supporting stable reference generation in analog circuits. Its cathode band polarity marking and UL94V-0 epoxy case ensure consistent mounting and safety compliance in high-reliability PCB assemblies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V ±5% - precise regulation point for 20 V rail stabilization |
| Test Current (IZT) | 65 mA - defined operating point for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 3.0 Ω - low AC resistance ensures minimal voltage shift under load transients |
| Max Reverse Current (IR) | 0.5 μA @ 15.2 V - ultra-low leakage preserves accuracy in high-impedance bias networks |
| Power Dissipation | 5.0 W at TL < 25°C (3/8″ lead length) - supports robust overvoltage clamping without forced cooling |
| Voltage Regulation (ΔVZ) | 0.40 V - difference between VZ at 10% and 50% of IZM, indicating excellent line regulation |
| Thermal Resistance | 25 °C/W junction-to-lead - enables predictable thermal design with standard lead-forming practices |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case (UL94V-0 epoxy), void-free transfer molded, 0.7 g weight, cathode indicated by colored band. Leads are tin-lead or RoHS-compliant matte-tin plated, solderable 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 voltage rail; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 5 W Zener | Industry-standard reliability and interchangeability in legacy and new designs |
| ±5% voltage tolerance (B suffix) | Guaranteed 19.0–21.0 V regulation window without calibration trimming |
| Moisture Sensitivity Level 1 | No dry pack required - simplifies SMT reflow prep and reduces handling overhead |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Robust handling during manual assembly and board-level testing without special precautions |
| RoHS compliant (e3 suffix) | Meets global environmental regulations; matte-tin plating ensures solderability and wire-bond compatibility |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing 20 V reference in programmable DC bench supplies and PLC analog I/O modules. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing stable bias for op-amps and DACs. Use Value: Maintains ≤0.40 V variation across 6.5–37.5 mA operating range, enabling 12-bit accuracy in feedback loops. |
Use Scenario: Clamping transient surges on 24 V control bus lines in factory automation systems. IC Role / Device Role / Timing Role: Fast-acting shunt protector diverting >10 A surge current (8.3 ms half-sine) away from downstream ICs. Use Value: Withstands 5.1 A peak surge (IZSM) and limits clamped voltage to ≤20.4 V, protecting 24 V-rated logic inputs. |
| Temperature-Stable Sensor Biasing | Legacy Equipment Voltage Reference |
Use Scenario: Providing excitation voltage for RTD bridges and strain-gauge Wheatstone networks in harsh environments. IC Role / Device Role / Timing Role: Low-drift Zener reference source with –65°C to +150°C operational range. Use Value: Delivers <0.5 μA leakage at 15.2 V, minimizing error contribution in microamp-level bridge currents. |
Use Scenario: Replacing obsolete 20 V Zeners in military-grade avionics power conditioning units. IC Role / Device Role / Timing Role: Direct drop-in replacement for legacy 1N5357B with identical T-18 outline and electrical specs. Use Value: JEDEC registration and MIL-PRF-19500 screening options (e.g., JANTXV prefix) support long-term obsolescence management. |
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) | Same electrical specs, no tape-and-reel packaging; lacks TR8 carrier tape and reel configuration | Not suitable for automated pick-and-place; requires manual loading or tube-to-tape conversion | Select 1N5357/TR8 for SMT production lines requiring EIA-296 compliant tape-and-reel delivery |
| MMSZ5248B-TP (Micro Commercial) | Surface-mount SOD-123 package; 20 V ±5%, but only 500 mW rating and 30 Ω impedance | Limited to low-power signal-level regulation; cannot replace 1N5357/TR8 in 5 W power-clamp roles | Choose MMSZ5248B-TP only for space-constrained PCBs where thermal derating permits ≤0.5 W operation |
Compared with 1N5357/TR8, the bulk 1N5357B offers identical regulation performance but no SMT logistics support, while the MMSZ5248B-TP sacrifices 10× power capability and 10× lower impedance for footprint reduction-making 1N5357/TR8 irreplaceable in high-energy clamp and precision reference applications.
Availability
1N5357/TR8 is available at Aetrix Electronics and suitable for industrial power supply regulation, overvoltage protection clamping, temperature-stable sensor biasing, and legacy equipment voltage reference applications requiring stable component supply and long-term sourcing continuity.
Supply support for 1N5357/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized 5 W voltage regulation in mission-critical power systems, emphasizing thermal stability, surge resilience, and JEDEC-standard interoperability.
FAQ
What is the Zener voltage tolerance of the 1N5357/TR8?
The 1N5357/TR8 has a ±5% Zener voltage tolerance, confirmed by the "B" suffix in its full designation. This means its measured VZ at 65 mA and 25°C falls within 19.0 V to 21.0 V. The tolerance is guaranteed across the full operating temperature range of –65°C to +150°C, and is verified per JEDEC test conditions including 40 ±10 ms DC current application.
Can the 1N5357/TR8 be used in surface-mount designs?
No-the 1N5357/TR8 is an axial-leaded T-18 package device intended for through-hole mounting. While it is supplied on tape-and-reel (TR8), the leads require hole placement and wave/soldering. For surface-mount equivalents, Microsemi offers the SMBJ5357B or SMBG5357B in DO-214AA packages-but these differ electrically and mechanically from the 1N5357/TR8.
What is the maximum surge current rating for the 1N5357/TR8?
The 1N5357/TR8 has a maximum non-recurrent surge current (IZSM) of 5.1 A, specified for an 8.3 ms half-sine waveform. This rating assumes proper PCB layout with adequate copper area and thermal relief. Exceeding this value-even briefly-may cause irreversible junction damage, as confirmed in Microsemi's datasheet Figure 1 derating curves and surge test notes.
How does the voltage regulation (ΔVZ) of 1N5357/TR8 impact circuit accuracy?
The 1N5357/TR8 specifies ΔVZ = 0.40 V-the difference between its Zener voltage measured at 10% and 50% of IZM (7.5 mA and 37.5 mA). This low value ensures minimal output drift under varying load conditions, directly enabling stable 12-bit analog system accuracy without additional buffering or trimming when used in feedback references.
Is the 1N5357/TR8 RoHS compliant?
Yes-the "e3" suffix in the full manufacturer part number (1N5357B e3) confirms RoHS compliance, and the TR8 packaging variant retains this status. The device uses annealed matte-tin plating on leads per MIL-STD-750 Method 2026 and meets all substance restrictions in Directive 2011/65/EU, with full material declarations available from Microchip's component database.
1N5357/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:
- ±20%
- 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
1N5357/TR8 FAQ
1.How can I place an order for 1N5357/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5357/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 1N5357/TR8 reliable?
The price and inventory of 1N5357/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5357/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5357/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5357/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5357/TR8?
1N5357/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5357/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 1N5357/TR8?
For technical support, including 1N5357/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5357/TR8 requirements.
6.How does Aetrix verify that 1N5357/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5357/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 1N5357/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5357/TR8?
All 1N5357/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5357/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 1N5357/TR8 part is unused and in its original packaging.
Return procedure for 1N5357/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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