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Microchip Technology 1N5357/TR12
- Part No.:
- 1N5357/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5357/TR12.pdf
- Description:
- DIODE ZENER 20V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,950
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Product details
Overview
1N5357/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 20 V ±5% (B suffix), 3.0 Ω maximum dynamic impedance at 65 mA test current, 75 mA maximum regulator current, 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 DC power supplies.
For engineers reviewing the 1N5357/TR12 datasheet, 1N5357/TR12 pinout, 1N5357/TR12 application, or 1N5357/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (75 A), reverse leakage (<0.5 µA at 14.4 V), and RoHS-compliant e3 marking compatibility.
Technical Context
This discrete Zener diode functions as a two-terminal shunt voltage regulator, maintaining stable output voltage under varying load and line conditions by operating in reverse breakdown. Its low dynamic impedance (3.0 Ω) and tight 5% tolerance ensure minimal voltage drift across its specified 65 mA test current and 75 mA maximum continuous current range.
The device uses a void-free thermosetting epoxy T-18 package with tin-lead or matte-tin plating, rated for 260 °C soldering (10 s), and features cathode band polarity marking. Thermal performance is defined relative to lead temperature (TL = 25 °C, 10 mm lead length) - not ambient - enabling predictable derating in heatsinked applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V ±5% at 65 mA - defines precise regulation point for feedback loops and reference circuits |
| Power Dissipation | 5.0 W at TL = 25 °C - requires mechanical heat sinking via leads for full-rated operation |
| Dynamic Impedance (ZZ) | 3.0 Ω max at IZT = 65 mA - ensures low AC ripple transmission in regulation applications |
| Max Regulator Current (IZM) | 75 mA - sets upper limit for stable DC regulation without thermal runaway |
| Voltage Regulation (ΔVZ) | 0.40 V max - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
| Surge Current (IZSM) | 75 A peak (8.3 ms half-sine) - supports transient overvoltage clamping in protection circuits |
| Reverse Leakage (IR) | <0.5 µA at VR = 14.4 V - guarantees low standby power loss in high-impedance bias networks |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC DO-204AL, void-free UL94V-0 epoxy body, 0.7 g weight, cathode indicated by color 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 / low-voltage side in regulation | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Reverse-biased regulation terminal / high-voltage side | Banded end; connected to unregulated input rail to clamp voltage at 20 V |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered B-suffix tolerance | ±5% VZ ensures consistent reference accuracy across production lots without binning |
| Low thermal resistance | 25 °C/W junction-to-lead enables 5 W operation with simple lead-mount heatsinking |
| High surge current capability | 75 A non-recurrent surge rating supports robust transient suppression in industrial power rails |
| Moisture sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - simplifies SMT reflow and storage logistics |
| e3 RoHS compliance | Lead-free matte-tin plating meets environmental regulations without sacrificing solderability |
Applications
| Industrial Power Supply Reference | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side error amplifiers. IC Role / Device Role / Timing Role: Shunt voltage reference providing 20 V基准 to optocoupler input or TL431 comparator. Use Value: Tight 5% tolerance and 3.0 Ω dynamic impedance minimize output voltage drift across line/load/temperature variations. | Use Scenario: Clamping induced transients on 24 V PLC I/O lines exposed to inductive switching noise. IC Role / Device Role / Timing Role: Passive crowbar element diverting surge energy to ground before downstream ICs exceed absolute maximum ratings. Use Value: 75 A 8.3 ms surge rating and low ΔVZ (0.40 V) ensure reliable clamping without thermal failure or voltage overshoot. |
| Programmable Voltage Monitor | Temperature-Stable Bias Network |
Use Scenario: Setting threshold for undervoltage lockout (UVLO) in battery-powered instrumentation with 20 V nominal rail. IC Role / Device Role / Timing Role: Precision voltage threshold generator feeding comparator input in monitoring circuitry. Use Value: −65 °C to +150 °C operating range and low VZ tempco enable reliable trip-point stability across extended environments. | Use Scenario: Establishing fixed bias current for RF amplifier stages requiring low-drift DC operating points. IC Role / Device Role / Timing Role: Low-noise, low-impedance current source formed with series resistor and 1N5357/TR12 shunt reference. Use Value: 0.5 µA max reverse leakage at 14.4 V minimizes bias current error; 3.0 Ω ZZ suppresses supply ripple coupling into sensitive analog nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5357B | Same 20 V ±5%, identical electrical specs, but in bulk (non-tape-and-reel) packaging | No TR12 tape/reel configuration; unsuitable for automated pick-and-place assembly | Select 1N5357/TR12 when requiring EIA-296 compliant 12 mm tape for SMT production |
| MMBZ5242B-TP | Surface-mount SOT-23 package; 20 V ±5%, but only 0.5 W rating and 20 mA IZM | Not interchangeable due to power handling limitation; suitable only for low-current bias/reference | Choose MMBZ5242B-TP only for space-constrained PCBs where 5 W dissipation is unnecessary |
Compared with 1N5357B and MMBZ5242B-TP, the 1N5357/TR12 uniquely combines JEDEC-standard axial-leaded form factor, 5 W power capability, tape-and-reel delivery, and industrial temperature range - making it optimal for high-reliability power supply and protection designs requiring manual or wave-solder assembly.
Availability
1N5357/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and programmable voltage monitors requiring stable component supply with RoHS compliance and tape-and-reel packaging.
Supply support for 1N5357/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized 5 W Zener regulation in harsh-environment power systems - emphasizing thermal robustness, surge resilience, and long-term parametric stability over commercial-grade alternatives.
FAQ
What is the Zener voltage tolerance for 1N5357/TR12?
The 1N5357/TR12 has a ±5% Zener voltage tolerance, confirmed by the "B" suffix in its part number per Microsemi's documentation. This means its regulated voltage falls within 19.0 V to 21.0 V at 65 mA test current and 25 °C lead temperature. The tolerance is guaranteed across the full −65 °C to +150 °C operating range, and the 1N5357/TR12 is tested and binned accordingly.
Can 1N5357/TR12 be used in surface-mount designs?
No - the 1N5357/TR12 is an axial-leaded T-18 package device intended for through-hole or lead-mounted applications. It is not compatible with SMT reflow processes due to its lead geometry and thermal mass. For surface-mount equivalents, Microsemi offers the SMBJ5357B or SMBG5357B in DO-214AA/DO-214AB packages, which share the same 20 V ±5% regulation but differ in power rating and mounting method.
What is the maximum continuous current for 1N5357/TR12?
The maximum continuous Zener current (IZM) for 1N5357/TR12 is 75 mA when operated at TL = 25 °C with 10 mm lead length from the body. This value assumes adequate heat sinking via the leads; derating is required above 25 °C per the power derating curve in Figure 1 of the datasheet. Exceeding IZM risks thermal runaway and permanent degradation of the 1N5357/TR12.
Does 1N5357/TR12 meet RoHS requirements?
Yes - the "e3" suffix in the full manufacturer designation (1N5357B e3) confirms RoHS compliance, and the 1N5357/TR12 uses annealed matte-tin plating on leads per MIL-STD-750 Method 2026. The T-18 epoxy body is UL94V-0 rated and contains no restricted substances above threshold limits, satisfying EU Directive 2011/65/EU and related global environmental standards.
How is polarity marked on 1N5357/TR12?
The cathode of the 1N5357/TR12 is marked by a distinct color band on the body - typically black or dark gray - positioned near one lead end. During Zener operation, this banded end must be held at a higher potential than the anode (unbanded end) to maintain reverse-bias conduction. Incorrect polarity results in forward conduction (~1.2 V drop) and loss of regulation, potentially damaging the 1N5357/TR12 if sustained at high current.
1N5357/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:
- ±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/TR12 FAQ
1.How can I place an order for 1N5357/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5357/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 1N5357/TR12 reliable?
The price and inventory of 1N5357/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5357/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5357/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5357/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5357/TR12?
1N5357/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5357/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 1N5357/TR12?
For technical support, including 1N5357/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5357/TR12 requirements.
6.How does Aetrix verify that 1N5357/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5357/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 1N5357/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5357/TR12?
All 1N5357/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5357/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 1N5357/TR12 part is unused and in its original packaging.
Return procedure for 1N5357/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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