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onsemi 1N5931BG
- Part No.:
- 1N5931BG
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N5931BG.pdf
- Description:
- DIODE ZENER 18V 3W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,960
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Product details
Overview
1N5931BG from onsemi is a 3 W, 18 V ±5% Zener diode in DO-41 axial package, designed for precision voltage regulation and overvoltage protection in DC power rails. It delivers 13.7 A maximum DC zener current, 20.8 Ω zener impedance at 12 mA test current, and supports surge power up to 98 W (1 ms), making it suitable for industrial power supply reference and transient suppression circuits.
For engineers reviewing the 1N5931BG datasheet, pinout, applications, or equivalent options, key selection criteria include its 18 V nominal zener voltage, ±5% tolerance, 20.8 Ω dynamic impedance at IZT = 12 mA, 0.25 μA leakage at VR = 13.7 V, and Pb-free DO-41 package with cathode band polarity marking.
Technical Context
This device uses silicon-oxide passivated junction technology to achieve stable reverse breakdown characteristics and high ESD robustness (Class 3, >16 kV HBM). Its thermal design relies on lead-to-ambient conduction, with junction-to-lead thermal resistance dependent on lead length (e.g., 3/8″ leads yield ~30°C/W derating above 75°C).
The 1N5931BG operates across −65°C to +200°C junction temperature range and is characterized at TL = 30°C for VZ specification. Its zener voltage exhibits a positive temperature coefficient (~+3.5 mV/°C near 18 V), requiring thermal-aware design in high-stability references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1–18.9 V @ IZT = 12 mA; defines regulated output voltage under nominal bias |
| Power Dissipation (PD) | 3 W @ TL = 75°C (3/8″ leads); limits continuous thermal load without forced cooling |
| Zener Impedance (ZZT) | 20.8 Ω @ IZT = 12 mA; determines regulation sensitivity to current variation |
| Reverse Leakage (IR) | 0.25 μA max @ VR = 13.7 V; ensures minimal quiescent current in standby mode |
| Surge Power | 98 W @ 1 ms non-repetitive; enables transient overvoltage clamping without failure |
| ESD Rating | Class 3 (>16 kV HBM); provides robust handling during assembly and field operation |
| Package | DO-41 (Case 59), axial-leaded, Pb-free; compatible with standard through-hole PCB assembly |
Pinout & Package
DO-41 plastic axial package with cathode indicated by a single black band. Leads are tin-plated, solderable at 260°C for 10 seconds at 1/16″ from case. Mounting position is unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to higher-potential rail; reverse-biased operation establishes fixed VZ drop |
| Anode | Reference/return node | Typically tied to ground or low-side return path; completes bias circuit for zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Guarantees tight regulation window (17.1–18.9 V) without post-manufacture trimming |
| 3 W steady-state power rating | Enables use in medium-power shunt regulators where 1 W devices would thermally saturate |
| 98 W surge capability (1 ms) | Clamps short-duration transients (e.g., inductive kickback) without degradation |
| ESD Class 3 (>16 kV HBM) | Eliminates need for external ESD protection in board-level handling and system integration |
| Pb-free DO-41 package | Meets RoHS compliance requirements while maintaining legacy footprint compatibility |
Applications
| Industrial Power Supply Reference | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side error amplifiers. IC Role / Device Role / Timing Role: Zener reference element providing precise 18 V reference for optocoupler-driven feedback loop. Use Value: Maintains <±1% output regulation across line/load variations due to low ZZT and stable VZ temperature coefficient. |
Use Scenario: Clamping 24 V DC bus against surge events in factory automation I/O modules. IC Role / Device Role / Timing Role: Shunt protector diverting transient energy to ground before downstream ICs exceed absolute maximum ratings. Use Value: Absorbs 98 W for 1 ms without parametric shift, preventing latch-up or damage to PLC input circuitry. |
| Programmable Logic Controller (PLC) Input Conditioning | Test Equipment Voltage Calibration Standard |
Use Scenario: Level-shifting and limiting analog sensor inputs (e.g., 4–20 mA loop receivers) in harsh industrial environments. IC Role / Device Role / Timing Role: Front-end clamp establishing safe input ceiling while preserving signal fidelity below VZ. Use Value: Withstands repeated 1 kV EFT bursts per IEC 61000-4-4 due to Class 3 ESD rating and rugged junction passivation. |
Use Scenario: Serving as traceable 18 V reference in benchtop multimeter calibration fixtures. IC Role / Device Role / Timing Role: Stable, low-drift voltage source used to verify DMM accuracy at mid-scale range points. Use Value: Delivers <0.5% long-term stability over 1,000 hours at 50% PD, meeting ANSI C12.1 metrology requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5931BRLG | Tape-and-reel packaging (6,000 units), identical electrical specs and DO-41 package | Optimized for automated SMT-compatible through-hole placement; same thermal and electrical behavior | Select when high-volume production requires reel-fed insertion equipment |
| BZX85C18 | 1.3 W rating, 18 V ±5%, DO-41 but lower surge (40 W @ 1 ms) and higher ZZT (35 Ω) | Suitable only for low-power biasing or signal-level clamping; not recommended for 3 W continuous loads | Choose only for space-constrained designs where 3 W dissipation is unnecessary and cost is primary driver |
Compared with 1N5931BRLG, the 1N5931BG offers identical performance in box-packaged form for manual or semi-automated assembly; compared with BZX85C18, the 1N5931BG provides 2.3× higher power handling and 42% lower dynamic impedance-critical for stable regulation under variable load conditions.
Availability
1N5931BG is available at Aetrix Electronics and suitable for industrial power supplies, programmable logic controller (PLC) input stages, overvoltage protection circuits, and test equipment calibration systems requiring stable component supply and full RoHS compliance.
Supply support for 1N5931BG 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 specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The 1N5931BG belongs to the 1N5913B Series of 3 W Zener regulators, engineered for high-reliability voltage reference and clamping in demanding industrial and infrastructure environments where thermal stability and surge resilience are critical.
FAQ
What is the nominal zener voltage and tolerance of the 1N5931BG?
The 1N5931BG has a nominal zener voltage of 18 V with a tolerance of ±5%, meaning its actual VZ falls between 17.1 V and 18.9 V when measured at IZT = 12 mA and lead temperature TL = 30°C. This tolerance is guaranteed by onsemi's manufacturing test flow and applies to every unit shipped as 1N5931BG.
Can the 1N5931BG be used in surface-mount designs?
No-the 1N5931BG is packaged exclusively in the axial-leaded DO-41 (Case 59) format and is intended for through-hole mounting. It lacks SMD-compatible terminations or footprint. For surface-mount equivalents, consider the SMAZ18 or NZ9F18V series, but note these differ in power rating, impedance, and thermal behavior versus the 1N5931BG.
What is the maximum DC zener current rating for the 1N5931BG?
The 1N5931BG supports a maximum DC zener current (IZM) of 13.7 A, calculated as PD/VZ(min) = 3 W / 17.1 V. This value assumes ideal heat sinking; in practice, continuous operation above 12 mA requires careful thermal management to avoid exceeding the 3 W derating curve.
How does the 1N5931BG perform under transient surge conditions?
The 1N5931BG is rated for 98 W non-repetitive surge power at 1 ms pulse width, verified per Figure 3 of the onsemi datasheet. This allows it to safely clamp fast transients such as inductive switch-off spikes or EFT bursts without parameter shift-provided peak current remains within the SOA boundary defined by the surge curve.
Is the 1N5931BG RoHS compliant and lead-free?
Yes-the "G" suffix in 1N5931BG explicitly denotes a Pb-free package per onsemi's ordering nomenclature. The device meets RoHS Directive 2011/65/EU requirements and uses lead-free molding compound and terminations, with no exemptions applied.
1N5931BG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 12 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 13.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1N5931BG FAQ
1.How can I place an order for 1N5931BG through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5931BG 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 1N5931BG reliable?
The price and inventory of 1N5931BG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5931BG is usually 5 days.
3.What payment methods are accepted for 1N5931BG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5931BG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5931BG?
1N5931BG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5931BG 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 1N5931BG?
For technical support, including 1N5931BG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5931BG requirements.
6.How does Aetrix verify that 1N5931BG is sourced from the original manufacturer or authorized distributors?
All 1N5931BG 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 1N5931BG meets industry standards.
7.What is the process for return or replacement of 1N5931BG?
All 1N5931BG units undergo pre-shipment inspection (PSI). If there is an issue with 1N5931BG, 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 1N5931BG part is unused and in its original packaging.
Return procedure for 1N5931BG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5931BG 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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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ4682T1G
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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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