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onsemi 1N5931BRL
- Part No.:
- 1N5931BRL
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N5931BRL.pdf
- Description:
- DIODE ZENER 18V 3W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,350
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Product details
Overview
1N5931BRL from onsemi is a 3 W axial-lead Zener diode in DO-41 (Case 59) package, rated for 18 V nominal Zener voltage at 12 mA test current, with 20.8 Ω maximum Zener impedance and ±5% tolerance. It delivers stable voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation for industrial power converters and embedded control systems.
For engineers reviewing the 1N5931BRL datasheet, pinout, applications, or equivalent options, key selection criteria include its 18 V Zener voltage, 3 W steady-state power rating at 75°C lead temperature, 98 W surge capability at 1 ms, Class 3 ESD rating (>16 kV HBM), and Pb-free tape-and-reel packaging (6000 units/reel).
Technical Context
This device operates as a silicon-oxide passivated junction Zener regulator, optimized for stable reverse-biased breakdown with low dynamic impedance. Its thermal design relies on lead-to-ambient conduction, with derating starting at 75°C for 3 W operation and at 50°C for 1 W ambient-rated dissipation.
The 1N5931BRL exhibits a typical Zener voltage temperature coefficient near +0.05 mV/°C for the 18 V variant (per Figure 5/6), and maintains ≤0.25 μA leakage at 13.7 V reverse bias - critical for low-power reference stability and precision clamping applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1–18.9 V @ IZT = 12 mA; ensures tight regulation window for 18 V rail supervision and feedback sensing |
| Power Dissipation (PD) | 3 W @ TL = 75°C (3/8″ lead length); supports continuous regulation in compact, thermally constrained PCB layouts |
| Zener Impedance (ZZT) | 20.8 Ω max @ IZT = 12 mA; minimizes output voltage variation under load transients in feedback networks |
| Surge Power | 98 W @ 1 ms non-repetitive pulse; enables robust transient overvoltage suppression without failure |
| ESD Rating | Class 3 (>16 kV HBM); provides inherent handling robustness during assembly and field operation |
| Leakage Current | ≤0.25 μA @ VR = 13.7 V; preserves accuracy in high-impedance reference divider chains |
| Package | DO-41 (Case 59), axial-lead plastic; compatible with standard through-hole insertion and wave soldering processes |
Pinout & Package
DO-41 (Case 59) axial-lead plastic package with cathode indicated by a painted band. Leads are corrosion-resistant, solderable, and rated for 260°C for 10 seconds at 1/16″ from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-bias anode connection point | Connected to higher-potential node in Zener regulation; defines polarity for correct breakdown orientation |
| Anode (unbanded end) | Reverse-bias cathode connection point | Typically tied to ground or lower-potential rail; completes reverse-bias path for controlled conduction |
Key Features
| Feature | Design Value |
|---|---|
| 3 W Zener power rating in DO-41 footprint | Delivers 3× the power of conventional 1 W Zeners without requiring larger board area or rework |
| ±5% Zener voltage tolerance (B-suffix) | Reduces need for external trimming in mid-precision voltage references and clamp circuits |
| Surge rating: 98 W @ 1 ms | Withstands common-line surges and inductive kickback without degradation in industrial controls |
| Pb-free tape-and-reel packaging (6000/reel) | Enables automated SMT-compatible placement despite axial-lead form factor |
| Silicon-oxide passivated junction | Ensures long-term parameter stability and low leakage drift across temperature and time |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converter feedback loop using optocoupler-coupled TL431 replacement. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 18 V threshold for error amplifier comparison. Use Value: Maintains ±1% output regulation under line/load transients due to low 20.8 Ω ZZT and minimal tempco drift. |
Use Scenario: Clamping 24 V DC bus against transient spikes from relay coil de-energization or motor commutation. IC Role / Device Role / Timing Role: Fast-acting shunt limiter diverting surge energy before downstream ICs exceed absolute maximum ratings. Use Value: Absorbs 98 W for 1 ms without failure, preventing latch-up or gate oxide damage in connected MOSFET drivers. |
| Industrial Sensor Reference | Programmable Logic Controller Input Conditioning |
Use Scenario: Providing stable 18 V excitation voltage for resistive bridge sensors in harsh factory environments. IC Role / Device Role / Timing Role: Low-drift voltage source for ratiometric measurement, minimizing gain error from supply variation. Use Value: Leakage ≤0.25 μA avoids loading high-impedance sensor outputs; oxide-passivation ensures 10+ year calibration stability. |
Use Scenario: Level-shifting and clamping 24 V digital inputs to protect FPGA or microcontroller GPIO pins. IC Role / Device Role / Timing Role: Bidirectional ESD and overvoltage clamp integrated into input RC filter network. Use Value: Class 3 HBM rating (>16 kV) plus 98 W surge handling eliminates need for discrete TVS in cost-sensitive PLC modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5931B (bulk, 2000/box) | Identical electrical specs and DO-41 package; differs only in packaging format (bulk vs. tape-and-reel) | No functional difference; bulk version requires manual handling or vibratory bowl feed instead of automated pick-and-place | Select 1N5931BRL when using automated assembly lines; choose 1N5931B for prototyping or low-volume hand-soldered builds |
| BZX85C18 (DO-41, 1.3 W) | Lower 1.3 W power rating, 20 Ω ZZT, same 18 V nominal but wider ±10% tolerance (C-suffix) | Insufficient surge margin (40 W @ 1 ms) and thermal headroom for sustained 18 V regulation in 24 V systems | Use BZX85C18 only in low-power signal-level clamping where 3 W dissipation is never approached |
Compared with 1N5931B (bulk) and BZX85C18, the 1N5931BRL offers identical regulation performance with production-ready tape-and-reel delivery, while outperforming BZX85C18 in surge resilience, thermal capacity, and voltage tolerance - making it the preferred choice for industrial power and protection designs.
Availability
1N5931BRL is available at Aetrix Electronics and suitable for industrial power supplies, programmable logic controller (PLC) input conditioning, and sensor reference circuits requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for 1N5931BRL 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 manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1N5931BRL belongs to the 1N5913B Series of 3 W Zener regulators, designed specifically for high-reliability voltage reference and overvoltage protection in industrial power conversion and ruggedized control systems.
FAQ
What is the Zener voltage tolerance of the 1N5931BRL?
The 1N5931BRL has a ±5% Zener voltage tolerance, confirmed by the "B" suffix in its part number per onsemi's tolerance designation standard. At 12 mA test current, its specified range is 17.1 V to 18.9 V, enabling tighter regulation than ±10% variants like the BZX85C18 - critical for applications demanding consistent 18 V reference accuracy without external trimming.
Can the 1N5931BRL be used in surface-mount designs?
The 1N5931BRL is a DO-41 axial-lead device and not a surface-mount component, but its tape-and-reel packaging (6000 units/reel) is compatible with automated pick-and-place machines equipped with axial-lead feeders. It is commonly mounted via through-hole reflow or wave soldering - not direct SMT - and requires appropriate hole size (0.028–0.034″ lead diameter) and pad layout per JEDEC DO-41 standards.
What is the maximum surge power rating for the 1N5931BRL?
The 1N5931BRL is rated for 98 W non-repetitive surge power at 1 ms pulse width, as specified in the Absolute Maximum Ratings table. This value is validated per onsemi's test conditions and reflects the device's ability to absorb transient energy without parametric shift or catastrophic failure - essential for protecting downstream circuitry from inductive switching spikes in motor drives and relay interfaces.
How does the thermal derating of the 1N5931BRL work above 75°C?
The 1N5931BRL derates linearly at 24 mW/°C above a lead temperature (TL) of 75°C, reducing its maximum steady-state power dissipation from 3 W. For example, at TL = 100°C, allowable PD drops to 2.4 W. This derating assumes 3/8″ lead length to heat sink; shorter leads increase thermal resistance and require more aggressive derating per Figure 1 in the datasheet.
Is the 1N5931BRL RoHS-compliant and Pb-free?
Yes, the 1N5931BRL is Pb-free and RoHS-compliant, as indicated by the "G" suffix in its full ordering code (1N5931BRL, G) and confirmed in the Packaging section of the datasheet. The device uses void-free, transfer-molded thermosetting plastic and meets JEDEC standards for lead-free soldering, including compatibility with 260°C peak temperature for 10 seconds at 1/16″ from the case.
1N5931BRL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- 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
1N5931BRL FAQ
1.How can I place an order for 1N5931BRL through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5931BRL 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 1N5931BRL reliable?
The price and inventory of 1N5931BRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5931BRL is usually 5 days.
3.What payment methods are accepted for 1N5931BRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5931BRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5931BRL?
1N5931BRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5931BRL 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 1N5931BRL?
For technical support, including 1N5931BRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5931BRL requirements.
6.How does Aetrix verify that 1N5931BRL is sourced from the original manufacturer or authorized distributors?
All 1N5931BRL 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 1N5931BRL meets industry standards.
7.What is the process for return or replacement of 1N5931BRL?
All 1N5931BRL units undergo pre-shipment inspection (PSI). If there is an issue with 1N5931BRL, 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 1N5931BRL part is unused and in its original packaging.
Return procedure for 1N5931BRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5931BRL Tags
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