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onsemi 1N5946BRLG
- Part No.:
- 1N5946BRLG
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N5946BRLG.pdf
- Description:
- DIODE ZENER 75V 3W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:1,784
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Product details
Overview
1N5946BRLG from onsemi is a 3 W axial-lead Zener diode with nominal zener voltage of 75 V, ±5% tolerance, 5.0 Ω maximum zener impedance at 140 mA test current, and 20 μA maximum reverse leakage at 56 V. It operates across −65 °C to +200 °C and delivers stable voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N5946BRLG datasheet, pinout, applications, or equivalent options, key selection criteria include its 75 V regulation point, DO-41 package compatibility, 98 W surge rating at 1 ms, and Pb-free tape-and-reel packaging for automated assembly.
Technical Context
This device uses silicon-oxide passivated junction technology to achieve tight voltage tolerance (±5%), low dynamic impedance, and high ESD robustness (>16 kV HBM). Its thermal design relies on lead-to-ambient conduction, with derating starting at 75 °C for steady-state operation at 3 W.
The 1N5946BRLG is characterized at TL = 30 °C with IZT = 140 mA; its zener voltage exhibits a positive temperature coefficient above ~50 V, confirmed by Figure 6 in the datasheet. Surge capability is defined by single-pulse non-repetitive limits-not thermal resistance curves-ensuring safe transient clamping without junction degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 75 V nominal (71.25–78.75 V range), enabling precise 75 V rail regulation or clamp threshold |
| Power Rating (PD) | 3 W at TL = 75 °C, supporting continuous regulation in compact, lead-cooled designs |
| Zener Impedance (ZZT) | 5.0 Ω max at IZT = 140 mA, ensuring minimal output voltage variation under load changes |
| Surge Power | 98 W @ 1 ms, allowing reliable transient suppression in line-powered systems |
| Reverse Leakage (IR) | 20 μA max at VR = 56 V, minimizing standby current in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV HBM), providing robust handling during PCB assembly and field service |
| Operating Temp | −65 °C to +200 °C, suitable for under-hood automotive, industrial controls, and aerospace environments |
Pinout & Package
Package: DO-41 (Case 59-10), axial-lead, transfer-molded thermosetting plastic; cathode indicated by band; lead diameter 0.71–0.86 mm; overall length 25.4 mm min.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener anode connection in reverse-bias configuration | Applied to higher potential node; regulates voltage referenced to anode |
| Anode (unbanded end) | Zener cathode connection in reverse-bias configuration | Connected to circuit ground or lower-potential reference; carries regulated current |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Guarantees tight regulation without post-production trimming in 75 V reference designs |
| 98 W surge rating (1 ms) | Clamps lightning-induced transients or inductive kickback without failure in AC/DC front-ends |
| ESD >16 kV (HBM) | Eliminates need for external ESD protection during manual handling or connector mating |
| Pb-free DO-41 package | Enables RoHS-compliant through-hole assembly with standard wave-solder profiles |
| Void-free molded case | Prevents moisture ingress and delamination in humid or outdoor-rated enclosures |
Applications
| Voltage Reference for SMPS Feedback | Overvoltage Clamp in Industrial PLC Inputs |
|---|---|
Use Scenario: Provides stable 75 V reference for optocoupler-based feedback in offline flyback converters. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference voltage at error amplifier input. Use Value: Maintains ±1% output regulation across line/load variations due to low 5.0 Ω ZZT and minimal tempco drift above 50 V. |
Use Scenario: Protects 24 V DC digital input circuits from accidental 75 V miswiring or surge events. IC Role / Device Role / Timing Role: Shunt clamp that conducts only when input exceeds 75 V, diverting fault current away from logic ICs. Use Value: Survives 98 W/1 ms surges without degradation, eliminating need for TVS diodes in cost-sensitive PLC modules. |
| High-Voltage Bias Network Stabilizer | Field Instrument Calibration Reference |
Use Scenario: Stabilizes bias voltage for op-amp high-side current sense amplifiers in 60–80 V battery systems. IC Role / Device Role / Timing Role: Zener diode regulating auxiliary supply rail to maintain amplifier common-mode range. Use Value: Delivers <20 μA leakage at 56 V, preserving accuracy in microamp-level sensor signal chains. |
Use Scenario: Serves as portable 75 V calibration standard for handheld multimeters and loop calibrators. IC Role / Device Role / Timing Role: Precision voltage reference traceable to ±5% factory calibration, used in benchtop verification. Use Value: Stable 75 V output over −25 °C to +70 °C enables field recalibration without environmental chamber support. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5946BRL | Same electrical specs; non-Pb-free variant (no "G" suffix) | Not compliant with RoHS Directive 2011/65/EU Annex II | Select 1N5946BRLG for new designs requiring Pb-free compliance; use 1N5946BRL only for legacy repair or exempt applications. |
| BZX85C75 | 1.3 W rating, 100 Ω ZZT, DO-41 package, ±5% tolerance | Lower power and higher impedance limit use to low-current references (<10 mA) | Choose BZX85C75 only where 1.3 W dissipation suffices and 75 V regulation at <10 mA is acceptable. |
Compared with 1N5946BRL and BZX85C75, the 1N5946BRLG offers triple the power rating and one-twentieth the zener impedance-enabling robust 75 V regulation in 100–200 mA applications where stability under load and surge resilience are critical.
Availability
1N5946BRLG is available at Aetrix Electronics and suitable for industrial power supplies, PLC input protection, high-voltage bias networks, and field instrument calibration requiring stable component supply and full RoHS compliance.
Supply support for 1N5946BRLG 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 1N5946BRLG belongs to the 1N5913B Series of 3 W Zener regulators, engineered for high-reliability voltage reference and clamping in harsh-environment systems where precision, surge immunity, and long-term stability are mandatory.
FAQ
What is the zener voltage tolerance of the 1N5946BRLG?
The 1N5946BRLG has a ±5% zener voltage tolerance, meaning its measured reverse breakdown voltage falls between 71.25 V and 78.75 V when tested at IZT = 140 mA and TL = 30 °C. This tolerance is guaranteed per the datasheet's "B" suffix designation and applies across the full operating temperature range.
Can the 1N5946BRLG be used in surface-mount designs?
No-the 1N5946BRLG is packaged exclusively in the axial-lead DO-41 (Case 59-10) format and is not compatible with surface-mount assembly. It requires through-hole mounting with 3/8″ lead length for rated 3 W dissipation. For SMT alternatives, consider the MMBZ5265B or similar SOD-123 devices-but note their lower power and different voltage ranges.
What is the maximum reverse leakage current for the 1N5946BRLG?
The 1N5946BRLG specifies a maximum reverse leakage current (IR) of 20 μA at VR = 56 V and TA = 25 °C. This value is verified per the Electrical Characteristics table and ensures minimal parasitic current draw in high-impedance reference or bias networks.
Does the 1N5946BRLG meet RoHS requirements?
Yes-the "G" suffix in 1N5946BRLG explicitly denotes a Pb-free package compliant with the EU RoHS Directive 2011/65/EU. The device uses lead-free terminations and halogen-free molding compound, and is qualified per onsemi's Pb-Free Packaging Specification.
How does the 1N5946BRLG handle short-duration surges?
The 1N5946BRLG is rated for 98 W non-repetitive surge power at 1 ms pulse width, as shown in Figure 3 of the datasheet. This capability allows it to safely clamp fast transients-such as EFT bursts or inductive switch-off spikes-without parametric shift or catastrophic failure, provided duty cycle remains below 0.1%.
1N5946BRLG 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):
- 75 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 140 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 56 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
1N5946BRLG FAQ
1.How can I place an order for 1N5946BRLG through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5946BRLG 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 1N5946BRLG reliable?
The price and inventory of 1N5946BRLG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5946BRLG is usually 5 days.
3.What payment methods are accepted for 1N5946BRLG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5946BRLG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5946BRLG?
1N5946BRLG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5946BRLG 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 1N5946BRLG?
For technical support, including 1N5946BRLG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5946BRLG requirements.
6.How does Aetrix verify that 1N5946BRLG is sourced from the original manufacturer or authorized distributors?
All 1N5946BRLG 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 1N5946BRLG meets industry standards.
7.What is the process for return or replacement of 1N5946BRLG?
All 1N5946BRLG units undergo pre-shipment inspection (PSI). If there is an issue with 1N5946BRLG, 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 1N5946BRLG part is unused and in its original packaging.
Return procedure for 1N5946BRLG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5946BRLG 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
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MMSZ5245BS-7-F
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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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