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Microchip Technology 1N5357A/TR8
- Part No.:
- 1N5357A/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5357A/TR8.pdf
- Description:
- DIODE ZENER 20V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,083
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Product details
Overview
1N5357A/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 20 V, ±10% tolerance (A 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 voltage reference and overvoltage protection in DC power supplies and industrial control circuits.
For engineers reviewing the 1N5357A/TR8 datasheet, 1N5357A/TR8 pinout, 1N5357A/TR8 application, or 1N5357A/TR8 equivalent, key selection criteria include its 20 V Zener voltage, ±10% tolerance, 5 W power rating, low thermal resistance (25 °C/W junction-to-lead), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a precision voltage reference by maintaining a stable reverse-biased breakdown voltage across a wide operating current range (10–75 mA) and temperature span (–65 °C to +150 °C). Its 25 °C/W junction-to-lead thermal resistance enables reliable 5 W dissipation with minimal lead-length heat sinking.
The 1N5357A/TR8 exhibits 0.40 V maximum voltage regulation (ΔVZ) between 10% and 50% of IZM, and 237 Ω maximum dynamic knee impedance (ZZK) at 1.0 mA - confirming stable low-current regulation behavior suitable for biasing and sensing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V nominal, ±10% tolerance - defines precise clamping threshold for protection or reference circuits. |
| Power Dissipation | 5.0 W at TL = 25 °C with 3/8″ lead length - supports robust voltage regulation under sustained load. |
| Test Current (IZT) | 65 mA - standard bias point for measuring VZ; ensures stable operation in typical regulator designs. |
| Dynamic Impedance (ZZ) | 3.0 Ω max at IZT - low AC impedance minimizes output voltage variation under dynamic load changes. |
| Max Reverse Current (IR) | 0.5 μA at 14.4 V - confirms sharp knee and low leakage below breakdown, critical for low-power biasing. |
| Thermal Resistance | 25 °C/W junction-to-lead - allows direct thermal path to PCB copper or chassis without complex heatsinking. |
| Surge Current (IZSM) | 75 A peak (8.3 ms half-sine) - withstands transient overvoltage events in industrial environments. |
Pinout & Package
Package: Axial-leaded T-18 plastic case (Void-free UL94V-0 epoxy), cathode indicated by band; leads are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit common; establishes polarity for reverse-bias operation during regulation. |
| Cathode (banded end) | Zener breakdown terminal / Regulated output node | Connected to voltage rail being stabilized; reverse-biased to maintain 20 V across load. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures standardized electrical behavior and interchangeability across qualified suppliers. |
| Moisture sensitivity Level 1 | No dry pack required - simplifies handling, storage, and assembly for high-volume manufacturing. |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for special ESD controls during board assembly or field service. |
| RoHS-compliant option (e3 suffix) | Meets global environmental compliance requirements without performance trade-offs. |
| High surge current rating (75 A) | Provides inherent transient immunity in unregulated input stages of industrial power systems. |
Applications
| DC Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing +24 V rail in industrial PLC power module with variable load current. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference and clamp element. Use Value: Maintains regulated 20 V reference for error amplifier feedback while absorbing up to 5 W during overloads. |
Use Scenario: Protecting microcontroller I/O pins against 30 V transients on sensor interface lines. IC Role / Device Role / Timing Role: Passive overvoltage clamp limiting voltage to safe 20 V level. Use Value: Prevents latch-up or damage using 75 A surge capability and <0.5 μA leakage at 14.4 V. |
| Bias Network for Op-Amp Circuits | Temperature-Stable Reference Source |
Use Scenario: Generating precision bias voltage for rail-to-rail op-amp input stage in analog signal conditioner. IC Role / Device Role / Timing Role: Shunt reference providing low-noise, stable DC offset. Use Value: Delivers 20 V reference with only 0.40 V regulation shift from 10% to 50% IZM, ensuring consistent amplifier bias. |
Use Scenario: Providing reference voltage for RTD measurement circuit operating from –40 °C to +85 °C ambient. IC Role / Device Role / Timing Role: Temperature-compensated Zener reference source. Use Value: Operates reliably across –65 °C to +150 °C with minimal VZ drift, validated per JEDEC registration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5357B/TR8 | ±5% tolerance (vs. ±10% for 1N5357A/TR8); identical VZ, package, and power rating. | Higher precision needed in feedback loops where tighter voltage stability is required. | Select 1N5357B/TR8 when system-level accuracy demands <±0.5 V deviation at 20 V. |
| MMBZ5242B (SOT-23) | Surface-mount, 0.5 W rating, 10 V Zener - not a direct replacement; different voltage, power, and package. | Used in space-constrained consumer electronics where 5 W dissipation is unnecessary. | Choose MMBZ5242B only for low-power, board-area-limited designs - not for 1N5357A/TR8 functional replacement. |
Compared with 1N5357B/TR8, the 1N5357A/TR8 trades voltage precision for cost and legacy compatibility; compared with MMBZ5242B, it delivers 10× higher power handling and axial-leaded mechanical robustness but requires larger PCB footprint.
Availability
1N5357A/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and analog bias networks requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N5357A/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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N53xx series was designed specifically for ruggedized voltage regulation in harsh-environment power systems - emphasizing thermal resilience, surge immunity, and JEDEC-standardized interchangeability.
FAQ
What is the Zener voltage tolerance for 1N5357A/TR8?
The "A" suffix in 1N5357A/TR8 specifies a ±10% Zener voltage tolerance, meaning the measured VZ falls between 18.0 V and 22.0 V at 65 mA test current and 25 °C. This tolerance is confirmed in the manufacturer's Electrical Characteristics table and applies across the full operating temperature range of –65 °C to +150 °C.
Can 1N5357A/TR8 be used without a heatsink?
Yes - the 1N5357A/TR8 can dissipate its full 5 W rating at 25 °C ambient when leads are trimmed to 3/8″ (10 mm) from the body, leveraging its 25 °C/W junction-to-lead thermal resistance. For continuous operation above 25 °C ambient or at elevated power levels, derating per Figure 1 is required; no external heatsink is necessary for typical industrial use cases.
Is 1N5357A/TR8 RoHS compliant?
The base 1N5357A/TR8 is not inherently RoHS compliant; however, Microsemi offers an RoHS-compliant version designated with the "e3" suffix (e.g., 1N5357Ae3/TR8), featuring annealed matte-tin plating per MIL-STD-750 and meeting IPC/JEDEC J-STD-020B Level 1 moisture sensitivity requirements without dry pack.
What is the maximum surge current rating for 1N5357A/TR8?
The 1N5357A/TR8 has a maximum non-recurrent surge current (IZSM) of 75 A, specified as the peak value of an 8.3 ms half-sine waveform. This rating is validated per JEDEC standards and enables reliable transient suppression in industrial power inputs subject to lightning-induced surges or inductive switching spikes.
How does the voltage regulation (ΔVZ) specification impact circuit design with 1N5357A/TR8?
The 0.40 V maximum ΔVZ (difference between VZ measured at 10% and 50% of IZM) indicates tight regulation linearity - critical when designing feedback networks or precision references. This low variation ensures predictable clamping behavior across varying load currents, reducing need for additional compensation in analog control loops using the 1N5357A/TR8.
1N5357A/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:
- ±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/TR8 FAQ
1.How can I place an order for 1N5357A/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5357A/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 1N5357A/TR8 reliable?
The price and inventory of 1N5357A/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5357A/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5357A/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5357A/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5357A/TR8?
1N5357A/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5357A/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 1N5357A/TR8?
For technical support, including 1N5357A/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5357A/TR8 requirements.
6.How does Aetrix verify that 1N5357A/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5357A/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 1N5357A/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5357A/TR8?
All 1N5357A/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5357A/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 1N5357A/TR8 part is unused and in its original packaging.
Return procedure for 1N5357A/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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