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Microchip Technology 1N5359B/TR12
- Part No.:
- 1N5359B/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5359B/TR12.pdf
- Description:
- DIODE ZENER 24V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:109
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Product details
Overview
1N5359B/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 maximum dynamic impedance at 50 mA test current, and 100 mA maximum regulator current (IZM) when adequately heat-sunk. It operates across –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in DC power supplies.
For engineers reviewing the 1N5359B/TR12 datasheet, 1N5359B/TR12 pinout, 1N5359B/TR12 application, or 1N5359B/TR12 equivalent, key selection criteria include its 24 V Zener voltage, 5 W steady-state power rating at TL < 25 °C, low 0.55 V voltage regulation (ΔVZ), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage reference by operating in reverse breakdown, maintaining stable output voltage across a broad current range (10–100 mA). Its thermal resistance is 25 °C/W junction-to-lead (3/8″ lead length) and 85 °C/W junction-to-ambient on FR4 PCB - requiring external heat sinking for sustained 5 W operation.
The 1N5359B/TR12 exhibits low dynamic impedance (3.5 Ω max at IZT = 50 mA) and tight voltage regulation (ΔVZ = 0.55 V between 10% and 50% of IZM), enabling stable reference performance under varying load conditions. Its cathode band marking and axial-lead T-18 package support through-hole mounting in industrial power rails and analog feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24 V ±5% - precise regulation point for 24 V rail stabilization and clamping. |
| Test Current (IZT) | 50 mA - standard bias point where VZ and ZZ are specified; design must ensure ≥10 mA minimum for regulation. |
| Dynamic Impedance (ZZ) | 3.5 Ω max - low AC impedance ensures minimal voltage shift under ripple or transient load changes. |
| Max Regulator Current (IZM) | 100 mA - maximum continuous reverse current before exceeding 5 W dissipation at TL < 25 °C. |
| Voltage Regulation (ΔVZ) | 0.55 V - difference between VZ measured at 10% and 50% of IZM; quantifies regulation linearity. |
| Thermal Resistance (RθJL) | 25 °C/W - junction-to-lead value defines required heatsinking for safe 5 W operation at elevated ambient. |
| Reverse Current (IR) | 0.5 µA max at VR = 18.2 V - leakage threshold confirming sharp knee and low standby loss. |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free thermosetting epoxy, UL94V-0 rated), 0.7 g weight, 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 / Reference ground node | Connected to circuit ground or lower-potential node; forward voltage ≤1.2 V at 1 A. |
| Cathode | Zener regulation terminal / Output reference node | Banded end; reverse-biased to maintain 24 V reference; requires current-limiting resistor in series. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures standardized electrical behavior, interchangeability, and qualification traceability across manufacturers. |
| ±5% voltage tolerance (B suffix) | Enables tighter system-level voltage margin control vs. ±10% (A) or ±20% (no suffix) variants. |
| Moisture sensitivity Level 1 | No dry pack required prior to assembly - simplifies handling and reduces manufacturing overhead. |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for special ESD handling during board assembly or field service. |
| RoHS-compliant (e3 suffix) | Meets global environmental compliance requirements without performance trade-offs. |
Applications
| Industrial Power Supply Regulation | Automotive Battery Monitoring |
|---|---|
Use Scenario: Stabilizing 24 V auxiliary rail in programmable logic controller (PLC) backplane power distribution. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing fixed 24 V reference for op-amp comparators and ADC biasing. Use Value: Maintains ±0.55 V regulation across 10–100 mA load variation, ensuring consistent analog measurement accuracy despite input ripple. |
Use Scenario: Overvoltage clamp protecting CAN transceiver supply rail against load-dump transients in 24 V truck systems. IC Role / Device Role / Timing Role: Passive shunt protector diverting surge energy above 24 V threshold to ground during ISO 7637-2 Pulse 5a events. Use Value: Withstands 100 A surge current (8.3 ms half-sine) without degradation, preserving downstream IC integrity. |
| Test Equipment Reference Source | Telecom Line Card Protection |
Use Scenario: Precision 24 V reference in bench multimeter front-end voltage divider networks. IC Role / Device Role / Timing Role: Low-drift, low-noise Zener element establishing calibration-grade reference for 4½-digit DMMs. Use Value: 3.5 Ω dynamic impedance minimizes measurement error induced by source impedance mismatch in high-Z inputs. |
Use Scenario: Secondary overvoltage protection on -48 V telecom DC feed lines exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Clamping device limiting transient excursions to ≤24 V above nominal rail during surge events. Use Value: 0.5 µA IR at 18.2 V ensures negligible standby current draw while maintaining fast response to overvoltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5359B (bulk, non-TR) | Identical electrical specs and package; differs only in packaging (loose vs. tape-and-reel). | No functional difference; TR12 enables automated SMT placement, bulk supports manual/hand-soldered prototyping. | Select 1N5359B/TR12 for production volume assembly; choose bulk 1N5359B for lab validation or low-volume builds. |
| MMSZ5245B-TP (Micro Commercial Components) | Surface-mount SOD-123 package (24 V, ±5%, 500 mW); lower power, higher ZZ (20 Ω), no IZM spec. | Not suitable for 5 W continuous dissipation; limited to low-power bias/reference roles in space-constrained designs. | Use MMSZ5245B-TP only where board area is critical and power < 0.5 W; retain 1N5359B/TR12 for full 5 W capability. |
Compared with 1N5359B (bulk) and MMSZ5245B-TP, the 1N5359B/TR12 delivers identical regulation performance with tape-and-reel logistics for high-volume manufacturing, while offering 10× the power handling of the SOD-123 alternative - making it the sole choice for robust 24 V shunt regulation in industrial power stages.
Availability
1N5359B/TR12 is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive battery monitoring, and telecom line card protection requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N5359B/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 designed specifically for ruggedized, high-power voltage regulation in harsh-environment power systems - emphasizing thermal robustness, surge resilience, and JEDEC-standardized interchangeability.
FAQ
What is the Zener voltage tolerance of the 1N5359B/TR12?
The 1N5359B/TR12 has a nominal Zener voltage of 24 V with a tolerance of ±5%, as indicated by the "B" suffix per Microsemi's documentation. This tolerance applies across the full operating temperature range of –65 °C to +150 °C and is verified at 50 mA test current with 40 ±10 ms settling time after current application.
Can the 1N5359B/TR12 be used without a heatsink?
The 1N5359B/TR12 can operate without an external heatsink only at significantly derated power levels: its steady-state power drops to 1.47 W at TA = 25 °C on FR4 with 4 mm² copper pads. For full 5 W operation, a heatsink is required to maintain TL < 25 °C at the lead 3/8″ from the body, given its 25 °C/W junction-to-lead thermal resistance.
What does the "TR12" suffix mean in 1N5359B/TR12?
The "TR12" suffix indicates tape-and-reel packaging per EIA-296 standard, with 12 mm tape width and component orientation optimized for automated pick-and-place equipment. This format supports high-volume manufacturing and differs only in packaging - not electrical or thermal performance - from the bulk 1N5359B variant.
Is the 1N5359B/TR12 RoHS compliant?
Yes, the 1N5359B/TR12 is RoHS compliant, as confirmed by the "e3" designation in Microsemi's official documentation. Its leads feature RoHS-compliant annealed matte-tin plating, and the void-free epoxy body meets UL94V-0 flammability standards without brominated flame retardants.
How is the cathode identified on the 1N5359B/TR12?
The cathode of the 1N5359B/TR12 is marked by a distinct colored band on the plastic T-18 case. The diode must be operated with this banded end held at a more positive potential than the anode - i.e., reverse-biased - to achieve Zener breakdown and voltage regulation at 24 V.
1N5359B/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:
- ±5%
- 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
1N5359B/TR12 FAQ
1.How can I place an order for 1N5359B/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5359B/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 1N5359B/TR12 reliable?
The price and inventory of 1N5359B/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5359B/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5359B/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5359B/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5359B/TR12?
1N5359B/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5359B/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 1N5359B/TR12?
For technical support, including 1N5359B/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5359B/TR12 requirements.
6.How does Aetrix verify that 1N5359B/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5359B/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 1N5359B/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5359B/TR12?
All 1N5359B/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5359B/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 1N5359B/TR12 part is unused and in its original packaging.
Return procedure for 1N5359B/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5359B/TR12 Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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SMAZ12-13-F
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