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onsemi 1N5369BG
- Part No.:
- 1N5369BG
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5369BG.pdf
- Description:
- DIODE ZENER 51V 5W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:1,177
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Product details
Overview
1N5369BG from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 51 V, ±5% tolerance, 25 Ω maximum zener impedance at 27 mA test current, and 0.9 mA maximum leakage current at 38.8 V. It delivers stable voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation for industrial power converters.
For engineers reviewing the 1N5369BG datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge capability (230 A peak @ 8.3 ms), Pb-free compliance, and axial lead mechanical robustness per CASE 017AA.
Technical Context
This device operates as a reverse-biased silicon Zener regulator with oxide-passivated junction, enabling tight voltage tolerance and low dynamic impedance. Its 5 W steady-state power rating is derated above 25 °C at 40 mW/°C, and it sustains non-repetitive 230 A surge current under 8.3 ms square-wave conditions.
The 1N5369BG exhibits a positive temperature coefficient typical of higher-voltage Zeners (>10 V), with measured TC near +0.05 %/°C - critical for precision reference stability across −65 °C to +200 °C operating range. Cathode polarity is marked by a band on the axial plastic body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 48.45–53.55 V @ IZT = 27 mA - defines regulated output voltage window under nominal bias |
| Power Dissipation (PD) | 5 W @ TL = 25 °C - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance (ZZT) | 25 Ω max @ IZT = 27 mA - determines regulation stiffness and AC ripple rejection |
| Leakage Current (IR) | 0.9 mA max @ VR = 38.8 V - ensures minimal shunt loss below regulation threshold |
| Surge Current (IRM) | 230 A peak @ 8.3 ms - enables transient overvoltage clamping without failure |
| Junction-to-Lead RθJL | 25 °C/W - governs thermal rise from junction to solder point; requires ≥3/8″ lead length for full rating |
| ESD Rating | Class 3 (>16 kV HBM) - supports handling in standard assembly environments without special ESD controls |
Pinout & Package
Package: Axial-lead, transfer-molded thermosetting plastic (CASE 017AA), cathode indicated by band. Dimensions: 8.38–8.89 mm length × 3.30–3.68 mm diameter, 25.4–31.75 mm lead length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in regulation circuit; forms reference ground return path |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input rail or feedback node; supplies stable 51 V reference when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| Silicon oxide-passivated junction | Enables ±5% VZ tolerance and stable long-term regulation performance |
| 25 Ω max ZZT at 27 mA | Provides low-output-impedance reference suitable for error amplifier feedback in SMPS |
| 230 A surge rating @ 8.3 ms | Clamps line transients in industrial AC/DC front-ends without degradation |
| Pb-free (G suffix) construction | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 3 moisture sensitivity |
| −65 °C to +200 °C operating range | Supports deployment in under-hood automotive, downhole, and high-temp industrial environments |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Regulating auxiliary 51 V rail in 48 V telecom rectifier modules. IC Role / Device Role / Timing Role: Zener diode provides precise voltage reference for TL431-based feedback loop. Use Value: Tight ±5% VZ tolerance and 25 Ω ZZT ensure <±1% output voltage drift across load and temperature. | Use Scenario: Clamping transient spikes on 48 V battery bus in EV charging station control board. IC Role / Device Role / Timing Role: Shunts excess energy during load dump or inductive kick events. Use Value: 230 A surge rating at 8.3 ms absorbs ISO 7637-2 Pulse 5a without failure, protecting downstream MOSFETs. |
| Programmable Reference Source | High-Temperature Sensor Biasing |
Use Scenario: Generating stable 51 V bias for avalanche photodiode (APD) arrays in optical test equipment. IC Role / Device Role / Timing Role: Serves as low-noise, temperature-compensated voltage source for APD gain control. Use Value: Positive TC (~+0.05 %/°C) counterbalances APD's negative TC, improving overall system gain stability. | Use Scenario: Providing regulated bias to RTD or thermocouple signal conditioning circuitry in oil & gas downhole tools. IC Role / Device Role / Timing Role: Maintains reference integrity at sustained 150 °C ambient (derated to 3.5 W). Use Value: Rated operation up to +200 °C pulsed and −65 °C storage enables reliable function in extreme thermal cycling environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5369B | Same electrical specs but SnPb lead finish (non-Pb-free) | Not compliant with RoHS or China RoHS; unsuitable for new designs targeting global markets | Select 1N5369BG for all new industrial and automotive designs requiring Pb-free compliance. |
| MMSZ5255B-TP | Surface-mount SOD-123 package; 50 V nominal, 5% tolerance; 500 mW rating | Limited to low-power applications (<0.5 W); cannot replace 5 W dissipation requirement | Use only where board space constraints prohibit axial leads and power demand is ≤0.5 W. |
Compared with 1N5369B and MMSZ5255B-TP, the 1N5369BG uniquely combines 5 W power handling, axial mechanical robustness, Pb-free compliance, and 51 V regulation - making it the sole option for high-reliability, high-power, through-hole Zener applications demanding regulatory alignment and thermal resilience.
Availability
1N5369BG is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, programmable reference sources, and high-temperature sensor biasing requiring stable component supply and long-term lifecycle support.
Supply support for 1N5369BG 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The 1N53 Series belongs to onsemi's Surmetic™ 40 Zener regulator family, engineered for high-power, high-reliability voltage reference and clamping in harsh-environment power systems.
FAQ
What is the nominal zener voltage and tolerance of the 1N5369BG?
The 1N5369BG has a nominal zener voltage of 51 V with a guaranteed tolerance of ±5%, corresponding to a minimum of 48.45 V and maximum of 53.55 V at 27 mA test current (IZT). This tight tolerance is achieved via oxide-passivated silicon junction technology and is specified per JEDEC standards for B-suffix devices.
What is the maximum continuous power dissipation for the 1N5369BG, and how does thermal derating work?
The 1N5369BG is rated for 5 W maximum steady-state power dissipation at lead temperature (TL) = 25 °C with 3/8″ lead length. Above 25 °C, it derates linearly at 40 mW/°C - meaning at 75 °C TL, its usable power drops to 3 W. Junction-to-lead thermal resistance is fixed at 25 °C/W, so proper heatsinking via lead length is essential for reliability.
Does the 1N5369BG have Pb-free construction, and what does the 'G' suffix indicate?
Yes, the 'G' suffix in 1N5369BG explicitly denotes Pb-free packaging per onsemi's RoHS-compliant manufacturing process. The device uses matte tin-plated leads and halogen-free molding compound, meeting JEDEC J-STD-609A Class 3 moisture sensitivity and EU Directive 2011/65/EU requirements - confirmed in the official datasheet revision 19 (July 2024).
What is the surge current rating of the 1N5369BG, and under what conditions is it specified?
1N5369BG is rated for 230 A peak non-repetitive surge current at an 8.3 ms pulse width, per Figure 5 in the onsemi datasheet. This rating assumes single-event, square-wave excitation at TA = 25 °C and validates its use in transient voltage suppression applications such as load dump protection in 48 V systems.
How does the temperature coefficient of the 1N5369BG affect its regulation performance?
The 1N5369BG exhibits a positive temperature coefficient (TC) typical of Zeners above 10 V - approximately +0.05 %/°C near 51 V, as inferred from Figure 3 of the datasheet. This means its zener voltage increases ~25.5 mV/°C, which must be accounted for in precision reference designs; however, it also enables partial compensation when paired with negatively drifting components like APDs or certain op-amps.
1N5369BG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 27 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 38.8 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
1N5369BG FAQ
1.How can I place an order for 1N5369BG through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5369BG 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 1N5369BG reliable?
The price and inventory of 1N5369BG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5369BG is usually 5 days.
3.What payment methods are accepted for 1N5369BG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5369BG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5369BG?
1N5369BG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5369BG 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 1N5369BG?
For technical support, including 1N5369BG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5369BG requirements.
6.How does Aetrix verify that 1N5369BG is sourced from the original manufacturer or authorized distributors?
All 1N5369BG 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 1N5369BG meets industry standards.
7.What is the process for return or replacement of 1N5369BG?
All 1N5369BG units undergo pre-shipment inspection (PSI). If there is an issue with 1N5369BG, 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 1N5369BG part is unused and in its original packaging.
Return procedure for 1N5369BG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5369BG Tags
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