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onsemi 1N6012B_T50R
- Part No.:
- 1N6012B_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N6012B_T50R.pdf
- Description:
- DIODE ZENER 33V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:6,136
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Product details
Overview
1N6012B_T50R from Fairchild Semiconductor is a 33 V, 5% tolerance, 500 mW glass-passivated Zener diode in DO-35 package, designed for precision voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and analog signal conditioning stages.
For engineers reviewing the 1N6012B_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy (31.35–34.65 V), low dynamic impedance (88 Ω @ 5 mA), leakage current ≤0.1 mA at 25 V, and thermal stability across –65°C to +200°C operating range.
Technical Context
This Zener diode operates in reverse breakdown with tightly controlled voltage regulation at 5 mA test current. Its DO-35 glass package ensures hermetic sealing and stable long-term performance under thermal cycling and humidity stress.
The device exhibits 88 Ω dynamic impedance at nominal current and 700 Ω knee impedance at 250 µA, enabling stable regulation even under light-load or transient conditions. Power dissipation is rated at 500 mW up to 75°C with 4.0 mW/°C derating beyond that temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 31.35–34.65 V at 5 mA - defines regulated output range for feedback or clamp circuits |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling in leaded PCB layout |
| Zener Impedance (ZZ) | 88 Ω @ IZ = 5 mA - determines regulation stiffness and AC ripple rejection capability |
| Knee Impedance (ZZK) | 700 Ω @ IZK = 250 µA - indicates onset of regulation at low-current standby modes |
| Leakage Current (IR) | ≤0.1 mA @ VR = 25 V - ensures minimal error current in high-impedance reference nodes |
| Operating Temp Range | –65°C to +200°C - supports deployment in automotive under-hood and industrial motor control environments |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device with no internal polarity reversal or auxiliary pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in reverse-bias regulation configuration |
| Cathode | Zener breakdown terminal / voltage reference output | Marked with band; connected to regulated output node or feedback divider tap |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables predictable regulation without post-production trimming in cost-sensitive power supplies |
| Hermetically sealed DO-35 glass case | Prevents moisture ingress and parameter drift during 10+ year field operation in humid environments |
| Low leakage current (≤0.1 mA) | Minimizes loading error in high-resistance voltage dividers used in precision ADC references |
| Wide operating temperature range | Supports direct mounting on heatsinks or near power semiconductors without derating penalties |
| Stable 5 mA test current point | Aligns with standard TL431 and optocoupler feedback loop design practices |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Zener reference element setting precise trip threshold for TL431 shunt regulator. Use Value: 33 V nominal breakdown enables accurate 12 V or 15 V output regulation with ±1% total loop error. |
Use Scenario: Protecting microcontroller I/O pins from ESD-induced transients or supply rail overshoot. IC Role / Device Role / Timing Role: Fast-acting voltage clamp limiting input voltage to safe logic-level thresholds. Use Value: 88 Ω dynamic impedance ensures clamping response within 10 ns of overvoltage event onset. |
| Analog Sensor Signal Conditioning | Industrial Current Loop Reference |
Use Scenario: Providing stable bias voltage for op-amp-based bridge sensor amplifiers in load cell interfaces. IC Role / Device Role / Timing Role: Precision DC reference source compensating for temperature-induced offset drift. Use Value: <0.1 mA leakage avoids loading 10 MΩ gain-setting resistors and preserves common-mode rejection. |
Use Scenario: Generating fixed reference for 4–20 mA transmitter circuitry in process automation systems. IC Role / Device Role / Timing Role: Stable voltage reference defining current-sense resistor scaling factor. Use Value: –65°C to +200°C operating range allows direct placement on DIN-rail mounted current loop modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N6012RLG | Same electrical specs; lead-free plating per RoHS, matte tin finish instead of SnPb | No functional change; required for lead-free assembly processes | Select when compliance with J-STD-020 reflow profiles and Pb-free soldering is mandatory |
| BZX55C33 | 33 V, 5%, 500 mW; higher ZZ (100 Ω) and wider temp range (–65°C to +175°C) | Slightly reduced regulation stiffness; lower max junction temperature rating | Choose where legacy BZX55 footprint compatibility is needed and 13°C lower TJMAX is acceptable |
Compared with 1N6012B_T50R, 1N6012RLG offers identical regulation performance with RoHS-compliant termination, while BZX55C33 provides footprint compatibility at the cost of 13.6% higher dynamic impedance and reduced thermal margin in high-ambient environments.
Availability
1N6012B_T50R is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and analog sensor interfaces requiring stable component supply with full traceability and long-lifecycle support.
Supply support for 1N6012B_T50R 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016; its legacy Zener diode portfolio remains widely deployed in industrial and automotive systems.
The 1N5985B–1N6025B series was engineered for high-reliability voltage reference and regulation in thermally demanding environments, emphasizing tight tolerance, low leakage, and robust glass-package hermeticity.
FAQ
What is the exact Zener voltage range for 1N6012B_T50R at 5 mA test current?
The 1N6012B_T50R has a guaranteed Zener voltage range of 31.35 V to 34.65 V when measured at 5 mA test current and 25°C ambient temperature. This 5% tolerance window reflects the device's specification per Fairchild's 1N5985B–1N6025B datasheet Rev. C2, and applies directly to the 1N6012B_T50R marking variant.
Does 1N6012B_T50R support lead-free soldering processes?
The 1N6012B_T50R uses traditional SnPb-plated leads and is not qualified for lead-free reflow profiles. For RoHS-compliant assembly, use the functionally identical 1N6012RLG variant, which features matte tin termination and meets J-STD-020 requirements. The 1N6012B_T50R itself requires SnPb-compatible thermal profiles.
What is the maximum allowable power dissipation for 1N6012B_T50R at 100°C lead temperature?
At 100°C lead temperature, the 1N6012B_T50R must be derated from its 500 mW rating at 75°C. With a derating factor of 4.0 mW/°C, the allowable power drops to 400 mW (500 mW − [4.0 mW/°C × 25°C]). This value assumes 3/8″ lead length and proper PCB copper pour heat sinking.
Can 1N6012B_T50R be used in place of 1N6012RLG without circuit modification?
Yes - the 1N6012B_T50R and 1N6012RLG share identical electrical specifications, DO-35 mechanical outline, and pin-to-pin functionality. The only difference is plating: SnPb vs. matte tin. Substitution is electrically transparent but requires matching solder process compatibility; mixing them in the same BOM may cause mixed-termination reliability concerns.
What is the leakage current specification for 1N6012B_T50R at 25 V reverse bias?
The 1N6012B_T50R exhibits a maximum leakage current of 0.1 mA when subjected to 25 V reverse bias at 25°C, as specified in the Fairchild 1N5985B–1N6025B datasheet. This low IR value ensures minimal loading error in high-impedance reference networks and supports stable operation in battery-powered sensor nodes.
1N6012B_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 88 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 25 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
1N6012B_T50R FAQ
1.How can I place an order for 1N6012B_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N6012B_T50R 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 1N6012B_T50R reliable?
The price and inventory of 1N6012B_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6012B_T50R is usually 5 days.
3.What payment methods are accepted for 1N6012B_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6012B_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N6012B_T50R?
1N6012B_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N6012B_T50R 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 1N6012B_T50R?
For technical support, including 1N6012B_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6012B_T50R requirements.
6.How does Aetrix verify that 1N6012B_T50R is sourced from the original manufacturer or authorized distributors?
All 1N6012B_T50R 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 1N6012B_T50R meets industry standards.
7.What is the process for return or replacement of 1N6012B_T50R?
All 1N6012B_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N6012B_T50R, 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 1N6012B_T50R part is unused and in its original packaging.
Return procedure for 1N6012B_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N6012B_T50R Tags
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