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onsemi 1N5946BRL
- Part No.:
- 1N5946BRL
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N5946BRL.pdf
- Description:
- DIODE ZENER 75V 3W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,882
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Product details
Overview
1N5946BRL from onsemi is a 3 W, ±5% tolerance Zener diode in DO-41 (Case 59) axial package, rated for 75 V nominal Zener voltage at 140 mA test current, with 5.0 Ω maximum Zener impedance and 0.25 μA reverse leakage at 56 V, used for precision voltage regulation and overvoltage protection in power supply feedback loops and reference circuits.
For engineers reviewing the 1N5946BRL datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, surge capability (98 W @ 1 ms), thermal derating behavior above 75°C, and Pb-free tape-and-reel packaging compatibility with automated assembly.
Technical Context
This device operates as a silicon-oxide passivated junction Zener regulator, delivering stable reverse breakdown voltage under DC and transient conditions. Its 3 W steady-state power rating at TL = 75°C and 98 W nonrepetitive surge capability enable robust clamping in industrial power rails and analog reference stages.
The 1N5946BRL exhibits a positive temperature coefficient typical of higher-voltage Zeners (>70 V), with measured TC near +0.07 mV/°C per Figure 6, and maintains low dynamic impedance (5.0 Ω) at IZT = 140 mA - critical for minimizing output voltage drift in regulated supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 71.25–78.75 V at IZT = 140 mA - defines tight ±5% regulation window for 75 V nominal reference |
| Max Zener Impedance | 5.0 Ω at IZT = 140 mA - ensures minimal AC ripple transmission in feedback paths |
| Reverse Leakage Current | 0.25 μA max at VR = 56 V - guarantees negligible error current in high-impedance reference dividers |
| Surge Power Rating | 98 W @ 1 ms - supports transient overvoltage suppression without degradation |
| Steady-State Power | 3 W @ TL = 75°C, derated to 24 mW/°C above - sets thermal design boundary for lead-mounted layouts |
| ESD Rating | Class 3 (>16 kV HBM) - enables handling in standard production environments without special ESD controls |
| Operating Temp Range | −65°C to +200°C - suitable for under-hood automotive, industrial control, and aerospace-grade applications |
Pinout & Package
Package: DO-41 (Case 59), axial-leaded, transfer-molded thermosetting plastic; cathode indicated by band; lead diameter uncontrolled within 0.71–0.86 mm; polarity: Pin 1 = Cathode (banded end), Pin 2 = Anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased Zener terminal | Connected to regulated node or feedback point; carries full Zener current during regulation |
| Anode | Reference/ground terminal | Typically tied to system ground or lower-potential rail; completes bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Pb-free tape-and-reel packaging | 6000 units/reel (1N5946BRL suffix), compatible with SMT pick-and-place and RoHS-compliant assembly |
| Silicon-oxide passivated junction | Enables stable long-term Zener voltage performance and low parameter drift across temperature and time |
| Surge-rated construction | Withstands 98 W single-pulse transients (1 ms), supporting use in unregulated input stages subject to line surges |
| Compact axial footprint | Same physical size as conventional 1 W Zeners - allows drop-in upgrade of legacy 75 V regulation without board rework |
| Guaranteed six-parameter limits | VZ, IZT, ZZT, IZK, ZZK, IR all 100% tested - reduces need for incoming inspection in high-reliability programs |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulating output voltage in flyback or forward converter feedback networks using optocoupler-coupled error amplifiers. IC Role / Device Role / Timing Role: Provides precise 75 V reference for TL431-type shunt regulators or discrete error amplifier biasing. Use Value: Tight ±5% VZ tolerance and low 5.0 Ω ZZT minimize output voltage error and improve load regulation accuracy. |
Use Scenario: Stabilizing excitation voltage for RTD or strain gauge bridges operating in harsh factory-floor environments. IC Role / Device Role / Timing Role: Acts as low-drift, high-temperature-stable voltage clamp and reference source for bridge biasing. Use Value: −65°C to +200°C operating range and oxide-passivated junction ensure stable reference over extended thermal cycles. |
| Overvoltage Protection Clamp | Programmable Threshold Detector |
Use Scenario: Protecting downstream ICs from transient overvoltage events on 48 V or 60 V DC distribution rails. IC Role / Device Role / Timing Role: Shunts excess energy to ground when rail exceeds 75 V, limiting peak voltage seen by protected circuitry. Use Value: 98 W surge rating and fast response (<100 ns) prevent latch-up or damage during lightning-induced or inductive-switching transients. |
Use Scenario: Setting trip point for comparator-based undervoltage lockout (UVLO) or brown-out detection in battery-powered systems. IC Role / Device Role / Timing Role: Supplies accurate 75 V threshold to comparator input via resistive divider, enabling precise turn-on/off control. Use Value: Low 0.25 μA leakage at 56 V ensures minimal divider current error, preserving threshold accuracy across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5946B | Same electrical specs, but supplied in 2000-unit Pb-free box (not tape-and-reel); no reel packaging support | Preferred for manual prototyping or low-volume hand-soldered builds where reel feeding is unnecessary | Select 1N5946BRL for automated SMT lines; choose 1N5946B for bench evaluation or small-batch assembly. |
| BZX85C75 | Same 75 V nominal VZ, but 1.3 W rating, 20 Ω ZZT, and TO-204AA (DO-41) package - lower power and higher impedance | Suitable only for low-current references (<20 mA) or non-critical clamping where tighter regulation isn't required | Use BZX85C75 only if power dissipation stays below 1.3 W and ±10% VZ tolerance is acceptable. |
Compared with 1N5946B and BZX85C75, the 1N5946BRL delivers higher power handling (3 W vs. 1.3 W), tighter impedance (5.0 Ω vs. 20 Ω), and guaranteed six-parameter testing - making it the preferred choice for production-grade 75 V regulation where reliability and precision are mandatory.
Availability
1N5946BRL is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioning circuits, and overvoltage protection modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N5946BRL 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1N59xxB series was designed specifically for high-reliability voltage regulation and transient suppression in demanding power conversion and instrumentation applications - emphasizing stability, surge resilience, and manufacturability.
FAQ
What is the Zener voltage tolerance of the 1N5946BRL?
The 1N5946BRL has a ±5% Zener voltage tolerance, meaning its reverse breakdown voltage is guaranteed between 71.25 V and 78.75 V when measured at IZT = 140 mA and lead temperature TL = 30°C. This tolerance is indicated by the "B" suffix in the part number and applies across the full operating temperature range.
Does the 1N5946BRL support automated assembly?
Yes, the 1N5946BRL is supplied in Pb-free tape-and-reel format (6000 units per reel), fully compatible with standard SMT pick-and-place equipment. Its DO-41 axial package and consistent orientation per reel specifications (per BRD8011/D) ensure reliable feeding and placement in high-volume manufacturing.
How does the 1N5946BRL handle transient overvoltage events?
The 1N5946BRL is rated for 98 W nonrepetitive surge power at 1 ms pulse width, as defined in Figure 3 of the datasheet. This capability allows it to safely clamp short-duration transients - such as those from inductive switching or ESD - without degradation, provided the duty cycle remains low and average power stays within 3 W limits.
What is the maximum reverse leakage current for the 1N5946BRL?
The 1N5946BRL specifies a maximum reverse leakage current (IR) of 0.25 μA at VR = 56 V, measured at TL = 30°C. This ultra-low leakage ensures minimal loading error in high-impedance reference circuits and preserves accuracy in precision voltage divider networks.
Can the 1N5946BRL be used in high-temperature environments?
Yes, the 1N5946BRL is rated for operation from −65°C to +200°C, with guaranteed performance across this full junction temperature range. Its silicon-oxide passivated junction and thermosetting plastic package provide long-term stability in under-hood automotive, downhole oil/gas, and industrial control applications.
1N5946BRL 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
1N5946BRL FAQ
1.How can I place an order for 1N5946BRL through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5946BRL 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 1N5946BRL reliable?
The price and inventory of 1N5946BRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5946BRL is usually 5 days.
3.What payment methods are accepted for 1N5946BRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5946BRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5946BRL?
1N5946BRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5946BRL 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 1N5946BRL?
For technical support, including 1N5946BRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5946BRL requirements.
6.How does Aetrix verify that 1N5946BRL is sourced from the original manufacturer or authorized distributors?
All 1N5946BRL 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 1N5946BRL meets industry standards.
7.What is the process for return or replacement of 1N5946BRL?
All 1N5946BRL units undergo pre-shipment inspection (PSI). If there is an issue with 1N5946BRL, 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 1N5946BRL part is unused and in its original packaging.
Return procedure for 1N5946BRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5946BRL Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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