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Microchip Technology 1N5357A/TR12
- Part No.:
- 1N5357A/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5357A/TR12.pdf
- Description:
- DIODE ZENER 20V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,430
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Product details
Overview
1N5357A/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 20 V, ±10% tolerance (A suffix), 65 mA test current (IZT), 3.0 Ω maximum dynamic impedance (ZZ), and 75 mA maximum Zener current (IZM) at 25°C lead temperature. 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 1N5357A/TR12 datasheet, 1N5357A/TR12 pinout, 1N5357A/TR12 application, or 1N5357A/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (5.1 A), voltage regulation (ΔVZ = 0.40 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
The 1N5357A/TR12 functions as a two-terminal voltage regulator diode operating in reverse breakdown mode. Its Zener voltage is specified at 20 V ±10% under 65 mA DC test current, with low dynamic impedance (≤3.0 Ω) ensuring stable regulation across load variations.
It features a T-18 axial package with cathode band marking, moisture sensitivity level 1 (no dry pack required), and thermal resistance of 25 °C/W junction-to-lead at 10 mm lead length - enabling reliable operation up to 5 W at TL < 25°C with adequate heat sinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V ±10% - defines nominal regulation point; actual range 18–22 V at 65 mA test current |
| Test Current (IZT) | 65 mA - DC current at which VZ is measured; sets baseline operating point for regulation accuracy |
| Dynamic Impedance (ZZ) | 3.0 Ω max - low AC resistance ensures minimal voltage shift under varying load currents |
| Max Zener Current (IZM) | 75 mA - maximum continuous DC current at 25°C lead temperature for full 5 W dissipation |
| Voltage Regulation (ΔVZ) | 0.40 V - difference between VZ at 10% and 50% of IZM; quantifies regulation linearity |
| Surge Current (IZSM) | 5.1 A - peak non-repetitive 8.3 ms half-sine current handling capability for transient suppression |
| Thermal Resistance | 25 °C/W junction-to-lead - enables thermal design with standard axial mounting and 10 mm lead length |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC DO-204AL; void-free UL94V-0 epoxy body; cathode indicated by color band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased reference terminal | Connected to lower-potential node; carries reverse leakage current below VZ |
| Cathode | Regulated output terminal | Banded end; held at stable VZ above anode; sinks regulated current to ground or return path |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures standardized mechanical dimensions, marking, and reliability testing across 1N53xx series |
| ±10% voltage tolerance (A suffix) | Cost-optimized regulation accuracy suitable for non-critical biasing and clamping applications |
| Moisture Sensitivity Level 1 | No dry pack or baking required before PCB assembly - reduces manufacturing overhead |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for special ESD handling during board assembly and testing |
| Tape-and-reel packaging (TR12 suffix) | Enables automated pick-and-place placement; 12-inch reel standard per EIA-296 |
Applications
| Industrial Power Supply Reference | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Stable 20 V reference for feedback loop in isolated DC-DC converters rated for 24 V input. IC Role / Device Role / Timing Role: Zener diode providing fixed voltage reference for optocoupler-based error amplifier. Use Value: Maintains ±10% output regulation across –40°C to +85°C ambient with ≤0.40 V ΔVZ drift over 7.5–37.5 mA operating range. |
Use Scenario: Protection of 18 V logic rail against 24 V transients in factory automation I/O modules. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage to 22 V maximum during surge events. Use Value: Absorbs 5.1 A 8.3 ms surges without failure, preventing downstream IC damage while maintaining <1 μA leakage at 18 V. |
| Temperature-Stable Bias Network | Programmable Current Source Reference |
Use Scenario: Biasing base-emitter junctions of high-side NPN transistors in linear regulator pass elements. IC Role / Device Role / Timing Role: Provides thermally compensated reference voltage for current mirror setup. Use Value: Delivers 20 V ±10% with 25 °C/W thermal resistance, minimizing drift when mounted on heatsinked chassis. |
Use Scenario: Setting reference voltage for LM334-based adjustable current source in sensor excitation circuits. IC Role / Device Role / Timing Role: Fixed-voltage node establishing precise current setpoint via external resistor. Use Value: Enables 1% current accuracy with 3.0 Ω ZZ and 65 mA IZT - critical for 4–20 mA transmitter calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5357B/TR12 | ±5% tolerance (vs. ±10% for 1N5357A/TR12); identical VZ, IZT, ZZ, and package | Higher regulation accuracy required in precision analog references or feedback loops | Select 1N5357B/TR12 when tighter voltage control justifies cost premium; same thermal and surge performance |
| MMBZ5248B-TP | Surface-mount SOD-123 package; 20 V ±5%; 20 mA IZT; 30 Ω ZZ; 250 mW power rating | Space-constrained PCBs where axial leads are incompatible with layout or automated assembly | Choose MMBZ5248B-TP only for low-power (<0.25 W), high-density designs - not a drop-in replacement for 5 W thermal loads |
Compared with 1N5357B/TR12, the 1N5357A/TR12 trades voltage accuracy for cost and compatibility with legacy axial layouts; versus MMBZ5248B-TP, it delivers 20× higher power handling and superior thermal management but requires through-hole mounting.
Availability
1N5357A/TR12 is available at Aetrix Electronics and suitable for industrial power supply reference, overvoltage clamp circuit, and temperature-stable bias network applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1N5357A/TR12 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 1N53xx series was designed for robust voltage regulation in harsh-environment power systems, emphasizing thermal resilience, surge survivability, and JEDEC-standardized manufacturability.
FAQ
What is the Zener voltage tolerance of the 1N5357A/TR12?
The 1N5357A/TR12 has a Zener voltage tolerance of ±10%, as indicated by the "A" suffix per Microsemi's documentation. This means its measured VZ at 65 mA test current falls within 18 V to 22 V at 25°C lead temperature. The tolerance is confirmed in the Electrical Characteristics table on page 1 of the datasheet and applies across the full operating temperature range of –65°C to +150°C.
Can the 1N5357A/TR12 be used in surface-mount designs?
No - the 1N5357A/TR12 uses a T-18 axial-leaded package (JEDEC DO-204AL) and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5357A series; however, those differ in thermal performance, surge rating, and footprint. The 1N5357A/TR12 must be mounted with 10 mm lead length for rated 5 W dissipation.
What is the maximum surge current rating for the 1N5357A/TR12?
The 1N5357A/TR12 has a maximum non-repetitive surge current (IZSM) of 5.1 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating is validated per Microsemi's test conditions and supports transient overvoltage protection in industrial power rails. Derating is required for repeated surges or elevated ambient temperatures.
Does the 1N5357A/TR12 require dry packing before reflow soldering?
No - the 1N5357A/TR12 has IPC/JEDEC J-STD-020B moisture sensitivity level 1, meaning it is not hygroscopic and does not require dry packing, baking, or special handling prior to soldering. Its void-free epoxy body meets UL94V-0 flammability standards and withstands 260°C for 10 seconds per MIL-STD-750.
How does the voltage regulation (ΔVZ) specification impact circuit design with the 1N5357A/TR12?
The 1N5357A/TR12 specifies ΔVZ = 0.40 V - the difference between Zener voltage measured at 10% and 50% of IZM (i.e., 7.5 mA and 37.5 mA). This quantifies regulation linearity: designers can expect ≤0.40 V variation across that current range, supporting stable biasing in analog circuits where load current shifts occur dynamically.
1N5357A/TR12 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:
- ±10%
- 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
1N5357A/TR12 FAQ
1.How can I place an order for 1N5357A/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5357A/TR12 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 1N5357A/TR12 reliable?
The price and inventory of 1N5357A/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5357A/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5357A/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5357A/TR12 transactions.
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4.How is shipping managed for 1N5357A/TR12?
1N5357A/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5357A/TR12 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 1N5357A/TR12?
For technical support, including 1N5357A/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5357A/TR12 requirements.
6.How does Aetrix verify that 1N5357A/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5357A/TR12 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 1N5357A/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5357A/TR12?
All 1N5357A/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5357A/TR12, 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 1N5357A/TR12 part is unused and in its original packaging.
Return procedure for 1N5357A/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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