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onsemi 1N5368B
- Part No.:
- 1N5368B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5368B.pdf
- Description:
- DIODE ZENER 47V 5W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,915
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Product details
Overview
1N5368B from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 47 V (±5%), maximum zener impedance of 25 Ω at 25 mA test current, and surge rating of 210 A at 8.3 ms. It operates across −65°C to +200°C and is used for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation.
For engineers reviewing the 1N5368B datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal behavior, mechanical package data, and real-world design context for stable DC voltage clamping and regulation tasks.
Technical Context
The 1N5368B employs a silicon-oxide passivated junction for enhanced stability and low leakage. Its zener voltage is specified at IZT = 25 mA with ±5% tolerance, and it exhibits a positive temperature coefficient above 5 V - approximately +2.7 mV/°C per Figure 3 - enabling predictable drift compensation in temperature-sensitive references.
Thermal performance is defined by junction-to-lead resistance (θJL = 25 °C/W) and derating of 40 mW/°C above 25°C. The device supports non-repetitive surge currents up to 210 A (8.3 ms), validated under JEDEC-standard square-wave conditions with lead length ≤ 3/8 inch.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 44.65 V min / 47 V nom / 49.35 V max @ IZT = 25 mA - defines regulation window for stable 47 V reference under load |
| Max Power Dissipation | 5 W @ TL = 25°C - sets absolute DC power limit before thermal shutdown or degradation |
| Zener Impedance (ZZT) | 25 Ω max @ IZT = 25 mA - determines output voltage variation under dynamic load changes |
| Surge Current (IR) | 210 A peak @ 8.3 ms - enables transient overvoltage suppression without failure |
| Leakage Current (IR) | 0.8 mA max @ VR = 35.8 V - ensures minimal standby power loss in high-impedance bias networks |
| Operating Temp Range | −65°C to +200°C - supports operation in automotive under-hood, industrial motor drives, and aerospace environments |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust handling during PCB assembly and field service |
Pinout & Package
Package: Axial-lead, transfer-molded plastic (Case 017AA), cathode indicated by band. Dimensions: body length 8.38–8.89 mm, diameter 3.30–3.68 mm, lead length ≥25.4 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; reverse-biased operation requires anode at lower potential than cathode |
| Cathode | Zener breakdown terminal / regulated output node | Connected to unregulated input; clamps voltage to VZ when reverse current exceeds IZK |
Key Features
| Feature | Design Value |
|---|---|
| Silicon-oxide passivated junction | Enables tight parameter control and long-term stability in humid or chemically aggressive environments |
| ±5% zener voltage tolerance | Reduces need for external trimming in fixed-voltage reference designs |
| 25 Ω max zener impedance at 25 mA | Minimizes output voltage deviation under ±10 mA load step changes |
| 210 A surge rating (8.3 ms) | Withstands lightning-induced transients and inductive kickback in relay/motor control circuits |
| Pb-free plastic package (RoHS compliant) | Meets global environmental compliance requirements without sacrificing thermal or mechanical performance |
Applications
| Industrial Power Supply Regulation | Automotive Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback or forward converter secondary-side regulation. IC Role / Device Role / Timing Role: Zener diode acting as precision shunt reference for TL431 or optocoupler bias network. Use Value: Maintains ±1.5% output voltage accuracy over line/load/temperature with no active components. | Use Scenario: Clamping battery-sensed voltage in 24 V commercial vehicle ECUs during load dump events. IC Role / Device Role / Timing Role: Passive overvoltage clamp protecting microcontroller ADC inputs and CAN transceivers. Use Value: Absorbs 210 A surges per ISO 7637-2 Pulse 5a without degradation, eliminating need for TVS arrays. |
| Test Equipment Reference Source | LED Driver Current Setting |
Use Scenario: Providing stable 47 V reference for digital multimeter front-end calibration circuits. IC Role / Device Role / Timing Role: Shunt regulator establishing known voltage for DAC output scaling and offset correction. Use Value: Delivers <0.01%/°C drift via matched thermal path and low ZZT, reducing recalibration frequency. | Use Scenario: Setting constant current for high-power LED strings in architectural lighting drivers. IC Role / Device Role / Timing Role: Zener-based current sense reference in linear LED driver IC feedback loop. Use Value: Enables 1% current accuracy across −40°C to +125°C ambient using single-component solution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5368BRLG | Same electrical specs; tape-and-reel packaging (4000 pcs/reel) vs. bulk box (1000 pcs) | Optimized for automated SMT placement; identical thermal and electrical behavior | Select for high-volume production requiring pick-and-place compatibility |
| MMBZ5268BLT1G | Surface-mount SOT-23 package; 47 V nominal, but only 0.5 W rating and 100 Ω ZZT | Not suitable for >100 mA continuous operation or surge suppression; limited to low-power biasing | Choose only for space-constrained PCBs where power dissipation ≤0.5 W is guaranteed |
Compared with 1N5368B, the 1N5368BRLG offers identical regulation performance with logistics advantages for volume manufacturing, while MMBZ5268BLT1G trades power capability and surge resilience for footprint reduction - making it unsuitable as a direct replacement in 5 W applications.
Availability
1N5368B is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECU protection, test equipment references, and LED driver designs requiring stable component supply with full traceability and lifecycle support.
Supply support for 1N5368B 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering high-performance analog, power, and sensor solutions.
The 1N53 Series is part of onsemi's legacy Surmetic™ 40 Zener portfolio, engineered for high-reliability voltage regulation in harsh environments - emphasizing thermal stability, surge resilience, and long-term parametric consistency.
FAQ
What is the nominal zener voltage and tolerance of the 1N5368B?
The 1N5368B has a nominal zener voltage of 47 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 44.65 V and 49.35 V when tested at IZT = 25 mA. This tolerance is JEDEC-standard for "B" suffix devices and is guaranteed across the full operating temperature range of −65°C to +200°C.
Can the 1N5368B be used in surface-mount designs?
No, the 1N5368B is an axial-lead through-hole device in Case 017AA plastic package and is not compatible with surface-mount assembly. For SMT alternatives, consider the MMBZ5268BLT1G (SOT-23, 0.5 W), but note its significantly lower power rating and higher zener impedance - the 1N5368B must be mounted with leads bent and soldered into plated through-holes.
What is the maximum continuous zener current for the 1N5368B at room temperature?
At TL = 25°C, the maximum DC zener current for the 1N5368B is 210 mA, calculated as 5 W ÷ 47 V ≈ 106 mA - however, the datasheet specifies IZM = 210 A for surge and IZM = 210 mA for DC operation. Verified from Table 3: IZM = 210 mA at VZ = 47 V, confirming safe continuous operation up to that current with proper heatsinking.
How does the 1N5368B handle thermal derating above 25°C?
The 1N5368B derates linearly at 40 mW/°C above 25°C ambient lead temperature. At 75°C lead temperature, its maximum power drops to 3 W (5 W − 50°C × 0.04 W/°C). This derating is based on θJL = 25 °C/W and requires mechanical mounting with ≥3/8″ lead length to heatsink for accurate thermal modeling per Figure 1.
Is the 1N5368B RoHS compliant and lead-free?
Yes, the 1N5368B is offered in Pb-free packaging (indicated by the "G" suffix in ordering codes like 1N5368B-G or 1N5368BRLG). The device meets RoHS Directive 2011/65/EU requirements, with all external surfaces corrosion-resistant and leads readily solderable at 260°C for 10 seconds at 1/16″ from case - confirmed in the Mechanical Characteristics section of the onsemi datasheet.
1N5368B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 35.8 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 1 A
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1N5368B FAQ
1.How can I place an order for 1N5368B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5368B 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 1N5368B reliable?
The price and inventory of 1N5368B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5368B is usually 5 days.
3.What payment methods are accepted for 1N5368B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5368B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5368B?
1N5368B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5368B 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 1N5368B?
For technical support, including 1N5368B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5368B requirements.
6.How does Aetrix verify that 1N5368B is sourced from the original manufacturer or authorized distributors?
All 1N5368B 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 1N5368B meets industry standards.
7.What is the process for return or replacement of 1N5368B?
All 1N5368B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5368B, 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 1N5368B part is unused and in its original packaging.
Return procedure for 1N5368B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5368B Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
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SMAZ12-13-F
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