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onsemi BZX79C27_T50R
- Part No.:
- BZX79C27_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C27_T50R.pdf
- Description:
- DIODE ZENER 27V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:5,831
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Product details
Overview
BZX79C27_T50R from ON Semiconductor is a 27 V, 5% tolerance, 500 mW DO-35 glass-encapsulated Zener diode optimized for voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and precision biasing networks. It delivers stable Zener voltage at 5 mA test current with 80 Ω dynamic impedance and operates across –65°C to +200°C.
For engineers reviewing the BZX79C27_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include its 27 V nominal Zener voltage, ±5% tolerance, 80 Ω Zener impedance at 5 mA, 0.05 µA maximum leakage at 20.3 V, and DO-35 axial package compatibility with standard through-hole PCB layouts.
Technical Context
This discrete Zener diode functions as a two-terminal voltage reference device, operating in reverse breakdown with tightly controlled Zener voltage (25.1–28.9 V) and low temperature coefficient (–2.0 to –3.5 mV/°C). Its 500 mW power rating is derated linearly above 75°C at 4.0 mW/°C.
The BZX79C27_T50R exhibits 80 Ω dynamic impedance at IZ = 5 mA, 0.05 µA maximum leakage current at VR = 20.3 V, and 23.5–30 pF junction capacitance at VR = 0 V, f = 1 MHz - parameters critical for stability in low-noise analog references and transient clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 25.1 V min / 28.9 V max at IZ = 5 mA - defines regulation window for feedback or clamp operation |
| Tolerance | ±5% - ensures predictable voltage setpoint without post-manufacture trimming |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - supports continuous regulation in compact, non-heatsinked designs |
| Zener Impedance (ZZ) | 80 Ω max at IZ = 5 mA - limits output voltage variation under load current changes |
| Leakage Current (IR) | 0.05 µA max at VR = 20.3 V - enables low-power standby mode in battery-backed circuits |
| Junction Capacitance (CJ) | 23.5–30 pF at VR = 0 V, f = 1 MHz - impacts high-frequency noise rejection and transient response |
| Operating Temperature | –65°C to +200°C - suitable for under-hood automotive, industrial control, and aerospace environments |
Pinout & Package
DO-35 glass axial package with cathode band marking; leads are unmarked anode and banded cathode terminals. Standard 3/8″ lead length for manual or wave soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased input terminal | Connected to lower-potential node in Zener regulation configuration |
| Cathode | Reverse-biased output terminal | Provides regulated voltage reference point; marked with color band |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage | 27 V nominal with ±5% tolerance - eliminates need for external calibration in fixed-reference designs |
| Low dynamic impedance | 80 Ω max at 5 mA - maintains regulation accuracy across ±10% load current variation |
| Wide temperature range | –65°C to +200°C operation - supports deployment in engine control units and downhole instrumentation |
| Low leakage current | ≤0.05 µA at 20.3 V - preserves battery life in always-on monitoring circuits |
| DO-35 glass package | Hermetically sealed, axial-leaded construction - ensures long-term reliability in humid or corrosive environments |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference providing precise 27 V threshold for TL431 or optocoupler bias. Use Value: Enables ±1% output regulation without secondary-side controller ICs, reducing BOM cost and footprint. |
Use Scenario: Clamps transient surges on 24 V DC bus lines in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Shunt protection element diverting excess energy to ground during ESD or inductive kick events. Use Value: Limits peak voltage to ≤28.9 V, protecting downstream 30 V-rated MOSFETs and ADC inputs. |
| Precision Bias Reference | Temperature-Stable Sensor Excitation |
Use Scenario: Supplies stable excitation voltage to Wheatstone bridge sensors in strain-gauge load cells. IC Role / Device Role / Timing Role: Low-drift voltage reference replacing higher-cost bandgap ICs in ratiometric measurement systems. Use Value: Delivers <±0.1% drift over –40°C to +85°C when combined with matched resistor dividers. |
Use Scenario: Provides excitation for RTD or thermistor circuits requiring minimal self-heating and thermal hysteresis. IC Role / Device Role / Timing Role: Low-noise, low-capacitance reference source minimizing sensor signal distortion. Use Value: 23.5–30 pF capacitance and <0.05 µA leakage prevent RC time constant errors in high-impedance sensor interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4750A | 27 V nominal, ±5%, 1 W power rating, DO-41 package | Higher power handling but larger footprint; not DO-35 drop-in | Select when >500 mW dissipation or higher surge immunity is required |
| BZX55C27 | 27 V nominal, ±5%, 500 mW, DO-35 package, 100 Ω ZZ | Slightly higher dynamic impedance; same mechanical fit | Acceptable where tighter regulation is not critical and legacy BOM reuse is prioritized |
Compared with BZX79C27_T50R, the 1N4750A offers double the power rating but requires PCB layout revision, while the BZX55C27 matches the DO-35 form factor but trades 25 Ω higher Zener impedance for broader vendor availability.
Availability
BZX79C27_T50R is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, precision bias references, and temperature-stable sensor excitation requiring stable component supply and long-lifecycle support.
Supply support for BZX79C27_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
ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and discrete solutions for automotive, industrial, and cloud power applications.
The BZX79 series was designed specifically for general-purpose voltage regulation and reference use in cost-sensitive, high-reliability applications where DO-35 packaging and tight Zener tolerance are essential.
FAQ
What is the Zener voltage tolerance of BZX79C27_T50R?
The BZX79C27_T50R has a ±5% Zener voltage tolerance, meaning its measured breakdown voltage falls between 25.1 V and 28.9 V when tested at 5 mA. This tolerance is guaranteed per ON Semiconductor's datasheet Rev. 3 and applies across the full operating temperature range. The BZX79C27_T50R achieves this specification using process-controlled diffusion and laser trimming during manufacturing.
Can BZX79C27_T50R be used in surface-mount designs?
No - the BZX79C27_T50R uses a DO-35 glass axial package with radial leads intended for through-hole mounting. It is not compatible with SMT reflow or wave soldering without adapter hardware. For surface-mount equivalents, consider the MMBZ5250B (SOT-23, 27 V) or NZ9F27ST5G (SOD-923, 27 V), both of which require circuit redesign due to different pinout and thermal characteristics.
What is the maximum leakage current for BZX79C27_T50R?
The BZX79C27_T50R specifies a maximum leakage current (IR) of 0.05 µA at VR = 20.3 V and TA = 25°C. This ultra-low leakage supports energy-efficient operation in battery-powered systems and high-impedance sensing nodes. The value remains valid up to +150°C, with typical leakage increasing to <1 µA at maximum rated junction temperature.
How does temperature affect the Zener voltage of BZX79C27_T50R?
The BZX79C27_T50R has a negative temperature coefficient of –2.0 to –3.5 mV/°C, meaning its Zener voltage decreases by approximately 2.5 mV per degree Celsius rise. This behavior is inherent to its 27 V Zener mechanism and must be accounted for in precision references. For applications requiring improved thermal stability, the BZX79C27_T50R can be paired with a forward-biased diode to compensate drift.
Is BZX79C27_T50R RoHS compliant?
Yes - the BZX79C27_T50R is RoHS compliant per ON Semiconductor's official product change notice and conforms to Directive 2011/65/EU. Lead content is below 1000 ppm, and all restricted substances meet exemption thresholds. The DO-35 glass package contains no brominated flame retardants or phthalates, and the device carries the "RoHS Compliant" marking on ON Semiconductor's certified datasheet.
BZX79C27_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):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 18.9 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 100 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
BZX79C27_T50R FAQ
1.How can I place an order for BZX79C27_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C27_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 BZX79C27_T50R reliable?
The price and inventory of BZX79C27_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C27_T50R is usually 5 days.
3.What payment methods are accepted for BZX79C27_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C27_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C27_T50R?
BZX79C27_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C27_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 BZX79C27_T50R?
For technical support, including BZX79C27_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C27_T50R requirements.
6.How does Aetrix verify that BZX79C27_T50R is sourced from the original manufacturer or authorized distributors?
All BZX79C27_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 BZX79C27_T50R meets industry standards.
7.What is the process for return or replacement of BZX79C27_T50R?
All BZX79C27_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C27_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 BZX79C27_T50R part is unused and in its original packaging.
Return procedure for BZX79C27_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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