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Microchip Technology 1N5357C/TR12
- Part No.:
- 1N5357C/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5357C/TR12.pdf
- Description:
- DIODE ZENER 20V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:7,617
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Product details
Overview
1N5357C/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 20 V, ±2% tolerance (C suffix), 3.0 Ω maximum dynamic impedance at 65 mA test current, and 75 mA maximum Zener current when adequately heat-sunk. It operates across –65°C to +150°C and is used for precision voltage reference and overvoltage protection in industrial power supplies.
For engineers reviewing the 1N5357C/TR12 datasheet, 1N5357C/TR12 pinout, 1N5357C/TR12 application, or 1N5357C/TR12 equivalent, this page delivers verified electrical specs, thermal derating behavior, JEDEC T-18 package details, and real-world selection guidance for stable 20 V regulation under variable load and temperature conditions.
Technical Context
This device functions as a two-terminal voltage reference where reverse-biased operation maintains a stable 20 V across its terminals within ±2% tolerance. Its low dynamic impedance (≤3.0 Ω) ensures minimal voltage shift under load changes up to 75 mA, and its 25 °C/W junction-to-lead thermal resistance enables reliable 5 W dissipation with 3/8″ lead length heat sinking.
The 1N5357C/TR12 exhibits ≤0.40 V voltage regulation (ΔVZ) between 10% and 50% of IZM, confirming tight regulation linearity. Its cathode band marking and tin-lead or RoHS-compliant matte-tin plating ensure unambiguous polarity identification and solderability per MIL-STD-750 Method 2026.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V ±2% - precise regulation point for reference and clamp circuits |
| Test Current (IZT) | 65 mA - operating point at which VZ and ZZ are specified |
| Dynamic Impedance (ZZ) | ≤3.0 Ω - low AC resistance ensures stable output under current transients |
| Max Zener Current (IZM) | 75 mA - maximum continuous DC current at 25°C with proper heat sinking |
| Power Dissipation (PD) | 5.0 W at TL = 25°C - rated steady-state power handling capability |
| Thermal Resistance (RθJL) | 25 °C/W - junction-to-lead resistance enables thermal design with standard lead mounting |
| Operating Temperature | –65°C to +150°C - wide range supports industrial and automotive under-hood use |
Pinout & Package
Package: JEDEC T-18 axial-leaded plastic encapsulated case (void-free UL94V-0 epoxy), 0.7 g weight, cathode indicated by colored band. Leads are tin-lead or RoHS-compliant matte-tin plated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Reverse-biased regulation terminal / high-voltage side | Banded end; connected to input rail to clamp or regulate at 20 V |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tighter regulation than ±5% (B) or ±10% (A) variants, reducing need for post-regulation trimming |
| Moisture sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - simplifies handling and storage logistics |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling in assembly |
| High surge current rating | 5.1 A peak non-recurrent half-sine (8.3 ms) - withstands transient overvoltage events without failure |
| RoHS compliant option | e3 suffix available - meets environmental compliance requirements without performance trade-off |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing feedback reference in 24 V DC-DC converter secondary side. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing precise 20 V setpoint to error amplifier. Use Value: ±2% tolerance and ≤0.40 V ΔVZ ensure output voltage accuracy remains within ±1.5% over full load and temperature range. | Use Scenario: Protecting microcontroller I/O pins from 24 V bus transients in factory automation PLC modules. IC Role / Device Role / Timing Role: Reverse-biased clamping element diverting surge current above 20 V to ground. Use Value: 5.1 A surge rating and low ZZ limit clamped voltage to ≤20.4 V during 8.3 ms transients, preventing latch-up. |
| Programmable Logic Controller Input Conditioning | Test Equipment Voltage Reference |
Use Scenario: Scaling and limiting 0–24 V analog sensor inputs to 0–20 V range for ADC front-end. IC Role / Device Role / Timing Role: Precision shunt regulator establishing upper rail limit in resistive divider network. Use Value: Tight 20 V ±2% tolerance and low temperature coefficient maintain scaling accuracy across –25°C to +70°C ambient. | Use Scenario: Providing stable 20 V reference in benchtop multimeter calibration circuitry. IC Role / Device Role / Timing Role: Primary voltage standard in passive reference chain with minimal self-heating drift. Use Value: 25 °C/W RθJL and 5 W rating allow operation at 65 mA with <1.6°C junction rise, minimizing thermal voltage 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 |
|---|---|---|---|
| 1N5357B/TR12 | ±5% tolerance (vs. ±2%); otherwise identical VZ, IZT, ZZ, and package | Acceptable where system-level calibration compensates for initial tolerance | Select when cost sensitivity outweighs need for tighter initial accuracy |
| MMBZ5248BS-7-F | Surface-mount SOD-123 package; 20 V ±5%; 225 mW PD; 30 Ω ZZ | Not suitable for 5 W power handling; limited to low-current bias/reference roles | Choose only for space-constrained PCBs where power dissipation ≤225 mW is sufficient |
Compared with 1N5357B/TR12 and MMBZ5248BS-7-F, the 1N5357C/TR12 uniquely delivers ±2% tolerance at full 5 W dissipation in an axial-leaded package-enabling high-accuracy, high-power shunt regulation without recalibration or heatsink redesign.
Availability
1N5357C/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, PLC input conditioning, and test equipment voltage references requiring stable component supply and long-term obsolescence management.
Supply support for 1N5357C/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/C series was designed to deliver JEDEC-standardized, high-power Zener regulation with military-grade screening options and broad voltage coverage (3.3–200 V) for ruggedized power management systems.
FAQ
What is the Zener voltage tolerance of the 1N5357C/TR12?
The 1N5357C/TR12 has a Zener voltage tolerance of ±2%, as indicated by the "C" suffix per Microsemi's documentation. This means its measured VZ falls within 19.6 V to 20.4 V at 65 mA test current and 25°C lead temperature. The tighter tolerance reduces system-level calibration burden compared to ±5% (B suffix) or ±10% (A suffix) variants of the same 20 V rating. This specification is guaranteed across the full operating temperature range.
Can the 1N5357C/TR12 be used without a heatsink?
The 1N5357C/TR12 can operate without an external heatsink only at significantly derated power levels. At ambient temperature (TA), its FR4 board-mounted thermal resistance is 85°C/W, limiting usable power to ~1.47 W at 25°C ambient. For full 5 W operation, it requires 3/8″ (10 mm) lead length from the body to achieve 25°C/W junction-to-lead resistance. Therefore, sustained 5 W use mandates proper lead-length heat sinking, not optional.
What does the "TR12" suffix mean in 1N5357C/TR12?
The "TR12" suffix in 1N5357C/TR12 indicates tape-and-reel packaging per EIA-296 standard, with 12,000 units per reel. This format supports automated SMT placement despite the device being axial-leaded - the leads are straightened and oriented for pick-and-place compatibility. The "C" remains the tolerance identifier (±2%), and "1N5357" is the base Zener voltage designation (20 V). No electrical or thermal parameters are altered by the TR12 packaging.
How does the 1N5357C/TR12 handle surge currents?
The 1N5357C/TR12 is rated for a maximum non-recurrent surge current (IZSM) of 5.1 A, defined as the peak of an 8.3 ms half-sine waveform. This capability allows it to absorb transient overvoltages-such as inductive kickback or ESD-induced spikes-without degradation. Its low dynamic impedance (≤3.0 Ω) ensures clamped voltage stays near 20 V during the surge, protecting downstream components. Surge rating assumes proper lead mounting and is validated per JEDEC test methods.
Is the 1N5357C/TR12 RoHS compliant?
Yes, the 1N5357C/TR12 is RoHS compliant, as confirmed by the "e3" designation in Microsemi's official documentation for the 1N5333B–1N5388B family. The device uses RoHS-compliant annealed matte-tin plating on leads and void-free UL94V-0 epoxy encapsulation. Compliance is verified per EU Directive 2011/65/EU and applies to both the base part and TR12 tape-and-reel configuration. No lead-containing materials are present in the finished device.
1N5357C/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:
- ±2%
- 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
1N5357C/TR12 FAQ
1.How can I place an order for 1N5357C/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5357C/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 1N5357C/TR12 reliable?
The price and inventory of 1N5357C/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5357C/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5357C/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5357C/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5357C/TR12?
1N5357C/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5357C/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 1N5357C/TR12?
For technical support, including 1N5357C/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5357C/TR12 requirements.
6.How does Aetrix verify that 1N5357C/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5357C/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 1N5357C/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5357C/TR12?
All 1N5357C/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5357C/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 1N5357C/TR12 part is unused and in its original packaging.
Return procedure for 1N5357C/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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