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Microchip Technology 1N5359/TR12
- Part No.:
- 1N5359/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5359/TR12.pdf
- Description:
- DIODE ZENER 24V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:3,296
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Product details
Overview
1N5359/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 24 V, ±5% tolerance (B suffix), 3.5 Ω dynamic impedance at 50 mA test current, and maximum reverse current of 0.5 μA at 18.2 V. It operates from –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5359/TR12 datasheet, 1N5359/TR12 pinout, 1N5359/TR12 application, or 1N5359/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (100 A), voltage regulation (ΔVZ = 0.55 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This discrete Zener diode functions as a two-terminal voltage regulator in reverse-biased mode, maintaining stable output voltage across wide operating current (IZM = 100 mA) and temperature ranges. Its low dynamic impedance (3.5 Ω) and tight voltage regulation (ΔVZ = 0.55 V) ensure minimal deviation under load transients.
Designed for axial-lead mounting on FR4 PCBs or chassis heat sinking, it delivers 5 W steady-state power at TL < 25 °C (3/8″ lead length), with thermal resistance de-rated to 85 °C/W junction-to-ambient when mounted on standard 1 oz copper pads. Polarity is marked by cathode band; device must be biased with banded end positive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24 V ±5% - precise regulation point for feedback networks requiring stable reference under varying load |
| Test Current (IZT) | 50 mA - standardized bias point for measuring VZ and dynamic impedance |
| Dynamic Impedance (ZZ) | 3.5 Ω - low AC resistance ensures minimal voltage shift during current fluctuations |
| Max Reverse Current (IR) | 0.5 μA @ 18.2 V - ultra-low leakage preserves accuracy in high-impedance reference paths |
| Max Regulator Current (IZM) | 100 mA - peak DC current capability with adequate heat sinking at 25 °C lead temperature |
| Surge Current (IZSM) | 100 A (8.3 ms half-sine) - withstands transient overloads without degradation |
| Voltage Regulation (ΔVZ) | 0.55 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
Pinout & Package
Package: Axial-leaded T-18 plastic case (Void-free transfer-molded thermosetting epoxy, UL94V-0 rated); leads plated with RoHS-compliant annealed matte tin, solderable per MIL-STD-750 Method 2026; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower-potential node; forms return path during Zener operation |
| Cathode | Zener regulation terminal / Output reference node | Banded end; connected to regulated voltage node; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 5 W Zener | Industry-standard footprint and reliability for drop-in replacement in legacy designs |
| Moisture Sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out prior to assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Robust against electrostatic discharge during handling and board assembly |
| RoHS compliant (e3 suffix) | Lead-free matte-tin plating meets environmental compliance without sacrificing solderability |
| High surge current withstand (100 A) | Protects downstream circuitry during line transients or inductive switching events |
Applications
| Switching Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback loop via optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Precision voltage reference establishing stable setpoint for error amplifier comparison. Use Value: 24 V ±5% regulation with 0.55 V ΔVZ ensures consistent output accuracy across line/load/temperature variations. | Use Scenario: Clamps transient voltage spikes on 24 V rail caused by relay coil de-energization or motor commutation. IC Role / Device Role / Timing Role: Two-terminal shunt protector diverting excess energy to ground before IC damage occurs. Use Value: 100 A surge rating and 0.5 μA leakage at 18.2 V enable reliable clamping without false triggering during normal operation. |
| Industrial Sensor Excitation | Programmable Logic Controller (PLC) Input Conditioning |
Use Scenario: Provides stable excitation voltage for 4–20 mA current-loop pressure or temperature transmitters. IC Role / Device Role / Timing Role: Low-drift voltage source powering sensor bridge or IC bias network. Use Value: 3.5 Ω dynamic impedance and –65 °C to +150 °C operating range maintain excitation stability in harsh factory environments. | Use Scenario: Conditions analog input signals entering PLC analog modules by limiting input voltage to safe levels. IC Role / Device Role / Timing Role: Front-end overvoltage limiter protecting ADC inputs and protection circuitry. Use Value: Axial T-18 package allows through-hole mounting near connector entry points; RoHS-compliant plating ensures long-term solder joint integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5359B (bulk) | Same electrical specs, identical Zener voltage and tolerance, but supplied in bulk (not tape-and-reel) | No reel packaging - suitable for manual assembly or low-volume prototyping | Select 1N5359/TR12 for automated SMT placement; choose 1N5359B for hand-soldered evaluation boards |
| MMSZ5242B-TP (Micro Commercial) | Surface-mount SOD-123 package; 24 V ±5%, 500 mW rating; higher ZZ (30 Ω), lower IZM (20 mA) | Not a direct replacement - limited power handling and thermal performance vs. 5 W axial design | Use MMSZ5242B-TP only in space-constrained, low-power signal-level references; retain 1N5359/TR12 for power-stage regulation |
Compared with 1N5359B and MMSZ5242B-TP, the 1N5359/TR12 uniquely combines JEDEC-standard axial packaging, 5 W dissipation, 100 mA IZM, and industrial-grade thermal performance - making it the preferred choice for high-reliability power supply and protection circuits where board-level heat sinking is feasible.
Availability
1N5359/TR12 is available at Aetrix Electronics and suitable for switching power supplies, industrial overvoltage protection circuits, and sensor excitation systems requiring stable component supply and long-lifecycle support.
Supply support for 1N5359/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 timing solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was engineered for robust voltage regulation in mission-critical power systems, emphasizing thermal resilience, surge immunity, and long-term parametric stability under extreme environmental stress.
FAQ
What is the Zener voltage tolerance for 1N5359/TR12?
The 1N5359/TR12 has a nominal Zener voltage of 24 V with ±5% tolerance, as indicated by the "B" suffix in its full designation. This means the actual regulation voltage falls between 22.8 V and 25.2 V at 50 mA test current and 25 °C lead temperature. The tolerance is guaranteed per JEDEC specification and verified during production testing.
Can 1N5359/TR12 be used in surface-mount designs?
No - the 1N5359/TR12 is an axial-leaded T-18 package intended for through-hole mounting. For surface-mount equivalents, Microsemi offers the SMBJ5359B or SMBG5359B in DO-214AA/DO-214AB packages. These share the same 24 V ±5% regulation but differ in thermal performance and mounting method; direct substitution requires PCB layout revision.
What is the maximum power dissipation of 1N5359/TR12 at 70°C ambient?
When mounted on an FR4 PCB with 1 oz copper (4 mm² pads, 1 mm track width), the 1N5359/TR12 derates linearly above 25 °C ambient. At 70 °C ambient, its steady-state power dissipation drops to approximately 0.78 W, calculated using the 85 °C/W junction-to-ambient thermal resistance and the 1.47 W rating at 25 °C.
Does 1N5359/TR12 meet RoHS requirements?
Yes - the "e3" suffix in the full part number confirms RoHS compliance. The 1N5359/TR12 uses RoHS-compliant annealed matte-tin plating on leads and a UL94V-0 rated epoxy body. It satisfies EU Directive 2011/65/EU and related global environmental regulations without exemption.
How is polarity identified on 1N5359/TR12?
Polarity is marked by a single color band on the cathode end of the 1N5359/TR12 axial package. During operation, the banded (cathode) terminal must be held at a more positive potential than the anode to achieve Zener breakdown and regulation. Reversing polarity subjects the device to forward conduction with ~1.2 V drop, not regulation.
1N5359/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):
- 24 V
- Tolerance:
- ±20%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 3.5 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 17.3 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
1N5359/TR12 FAQ
1.How can I place an order for 1N5359/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5359/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 1N5359/TR12 reliable?
The price and inventory of 1N5359/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5359/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5359/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5359/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5359/TR12?
1N5359/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5359/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 1N5359/TR12?
For technical support, including 1N5359/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5359/TR12 requirements.
6.How does Aetrix verify that 1N5359/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5359/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 1N5359/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5359/TR12?
All 1N5359/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5359/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 1N5359/TR12 part is unused and in its original packaging.
Return procedure for 1N5359/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5359/TR12 Tags
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