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Microchip Technology 1N5357B/TR12
- Part No.:
- 1N5357B/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5357B/TR12.pdf
- Description:
- DIODE ZENER 20V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,291
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Product details
Overview
1N5357B/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 20 V ±5%, maximum dynamic impedance of 3.0 Ω at 65 mA test current, and maximum reverse current of 0.5 μA at 15.2 V. It operates across –65°C to +150°C and is used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5357B/TR12 datasheet, 1N5357B/TR12 pinout, 1N5357B/TR12 application, or 1N5357B/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (75 A), voltage regulation (ΔVZ = 0.40 V), and RoHS-compliant e3 suffix availability.
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, up to 75 mA IZM) and temperature ranges. Its low dynamic impedance (3.0 Ω) ensures minimal voltage deviation under load transients.
The 1N5357B/TR12 features a T-18 axial package with cathode band marking, moisture sensitivity level 1 per J-STD-020B, and UL94V-0 epoxy encapsulation. It supports lead-free soldering at 260 °C for 10 s and delivers 5 W steady-state power at 25 °C lead temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V ±5% - precise regulation point for feedback networks requiring tight voltage setpoints |
| Test Current (IZT) | 65 mA - standard bias point for measuring VZ and ZZ; defines typical operating zone |
| Dynamic Impedance (ZZ) | 3.0 Ω max - low AC impedance ensures stable regulation under varying load currents |
| Max Reverse Current (IR) | 0.5 μA at 15.2 V - confirms sharp knee and low leakage in standby or low-power modes |
| Max Regulator Current (IZM) | 75 mA - maximum DC current before thermal derating; sets upper limit for continuous operation |
| Voltage Regulation (ΔVZ) | 0.40 V - difference between VZ measured at 10% and 50% of IZM; quantifies line regulation performance |
| Surge Current (IZSM) | 75 A (8.3 ms half-sine) - withstands transient overloads without degradation |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables high-power operation with minimal heatsinking when leads are 10 mm from body |
Pinout & Package
Package: T-18 axial-leaded plastic case (UL94V-0 epoxy), 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 | Connected to lower-potential node; reverse-biased operation requires this terminal to be at lower voltage than cathode |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; connected to regulated output node; establishes 20 V reference relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance (B suffix) | Enables tighter feedback loop accuracy vs. ±10% (A) or ±20% (no suffix) parts in power supply designs |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints-suitable for standard SMT/through-hole assembly without baking |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for ESD-protected workstations during board assembly |
| RoHS-compliant e3 option | Supports environmental compliance without sacrificing electrical or thermal performance; identical specs to non-e3 versions |
| High surge current capability (75 A) | Provides robustness against line transients and inrush events in industrial power supplies and motor drives |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in TL431-based or discrete op-amp feedback circuits to regulate 24 V DC output in telecom power bricks. IC Role / Device Role / Timing Role: Zener reference element setting error amplifier threshold; provides stable 20 V reference for comparator input. Use Value: Tight ±5% tolerance and low ΔVZ (0.40 V) minimize output voltage drift across line/load/temperature variations. | Use Scenario: Placed across DC bus in motor drive inverters to clamp transient spikes above 20 V during switching transitions. IC Role / Device Role / Timing Role: Passive overvoltage clamp protecting IGBT gate drivers and bus capacitors from >20 V excursions. Use Value: 75 A surge rating and low ZZ (3.0 Ω) enable fast clamping response with minimal voltage overshoot during 8.3 ms transients. |
| Programmable Voltage Reference | Industrial Sensor Excitation |
Use Scenario: Paired with precision resistors in 4–20 mA transmitter circuits to generate stable 20 V excitation for RTD or bridge sensors. IC Role / Device Role / Timing Role: Primary voltage reference source; replaces higher-cost IC references where moderate accuracy suffices. Use Value: Low temperature coefficient (implied by stable VZ over –65°C to +150°C) maintains sensor linearity across extended ambient ranges. | Use Scenario: Supplies regulated bias to piezoelectric pressure sensors in oil & gas downhole tools operating at 125°C ambient. IC Role / Device Role / Timing Role: High-temperature-stable Zener reference providing excitation voltage independent of supply rail fluctuations. Use Value: Rated operation to +150°C and low thermal resistance (25 °C/W) ensure reliable regulation without external heatsinking in confined enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5357B (non-TR12) | Same electrical specs; differs only in packaging-bulk pack vs. tape-and-reel (TR12) | No functional difference; TR12 enables automated pick-and-place assembly | Select 1N5357B/TR12 for SMT production lines requiring reel-fed feeders; choose bulk for manual or low-volume prototyping |
| MMBZ5242B (SOT-23) | Surface-mount package; same 20 V ±5% rating but lower power (500 mW), higher ZZ (30 Ω), and lower IZM (20 mA) | Not suitable for 5 W dissipation; limited to low-current bias/reference roles in space-constrained PCBs | Choose MMBZ5242B only when board area is critical and power < 0.5 W; retain 1N5357B/TR12 for >1 W regulation or surge immunity |
Compared with 1N5357B (bulk) and MMBZ5242B (SOT-23), the 1N5357B/TR12 offers full 5 W power handling, industry-standard axial mounting, and tape-and-reel compatibility-making it optimal for high-reliability, medium-to-high power industrial power supplies where thermal robustness and assembly automation are required.
Availability
1N5357B/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, programmable voltage references, and industrial sensor excitation requiring stable component supply and long-term lifecycle support.
Supply support for 1N5357B/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, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N53xxB series was designed for ruggedized voltage regulation in harsh-environment power systems-emphasizing wide temperature range, high surge immunity, and MIL-grade screening options.
FAQ
What is the Zener voltage tolerance of the 1N5357B/TR12?
The 1N5357B/TR12 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix in its part number. This means its nominal 20 V regulation voltage falls within 19.0 V to 21.0 V at 65 mA test current and 25 °C lead temperature. The tolerance is confirmed in Microsemi's official datasheet revision D (2008) and applies across the full operating temperature range.
Does the 1N5357B/TR12 require dry packing or baking before use?
No, the 1N5357B/TR12 does not require dry packing or baking before use. It carries moisture sensitivity level (MSL) 1 per IPC/JEDEC J-STD-020B, meaning it is exempt from floor-life limitations and can be assembled directly from reel without preconditioning. This is explicitly stated in the "Features" section of the Microsemi datasheet.
What is the maximum steady-state power dissipation for the 1N5357B/TR12 on a standard FR4 PCB?
When mounted on a standard FR4 PCB (1 oz copper, 4 mm² pads, 1 mm track width, 25 mm length), the 1N5357B/TR12 has a steady-state power dissipation limit of 1.47 W at 25 °C ambient temperature. This value derives from its 85 °C/W junction-to-ambient thermal resistance and is documented in the "Maximum Ratings" section of the Microsemi datasheet.
Can the 1N5357B/TR12 be used as a direct replacement for the 1N5357 (no suffix)?
No-the 1N5357B/TR12 is not a direct replacement for the unsuffixed 1N5357. The "B" suffix denotes ±5% tolerance, whereas the unsuffixed version has ±20% tolerance. Their Zener voltages differ significantly (19–21 V vs. 16–24 V), making them incompatible in precision regulation circuits. Always verify tolerance requirements before substitution.
What does the "TR12" suffix indicate in 1N5357B/TR12?
The "TR12" suffix in 1N5357B/TR12 indicates tape-and-reel packaging per EIA-296 standard, with 12 mm tape width. This format supports automated surface-mount and through-hole placement equipment. The electrical and thermal specifications are identical to the bulk-packaged 1N5357B; only the packaging differs.
1N5357B/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:
- ±5%
- 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
1N5357B/TR12 FAQ
1.How can I place an order for 1N5357B/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5357B/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 1N5357B/TR12 reliable?
The price and inventory of 1N5357B/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5357B/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5357B/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5357B/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5357B/TR12?
1N5357B/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5357B/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 1N5357B/TR12?
For technical support, including 1N5357B/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5357B/TR12 requirements.
6.How does Aetrix verify that 1N5357B/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5357B/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 1N5357B/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5357B/TR12?
All 1N5357B/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5357B/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 1N5357B/TR12 part is unused and in its original packaging.
Return procedure for 1N5357B/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5357B/TR12 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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