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onsemi BZX79C2V7_T50R
- Part No.:
- BZX79C2V7_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C2V7_T50R.pdf
- Description:
- DIODE ZENER 2.7V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:5,267
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Product details
Overview
BZX79C2V7_T50R from ON Semiconductor is a 2.7 V, ±5% tolerance Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 100 Ω dynamic impedance at 5 mA test current and -3.5 mV/°C temperature coefficient - used for precision voltage reference and overvoltage protection in low-power linear regulators and sensor biasing circuits.
For engineers reviewing the BZX79C2V7_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal coefficient, leakage current at 1 V (≤100 μA), junction capacitance (255 pF at 0 V), and DO-35 mechanical compatibility with through-hole PCB layouts.
Technical Context
This device operates as a reverse-biased voltage-regulating diode with stable breakdown at 2.7 V under 5 mA nominal test current. Its -3.5 mV/°C temperature coefficient indicates predictable negative drift with rising ambient temperature, enabling compensated reference designs.
The DO-35 glass package supports lead temperature-controlled derating (4.0 mW/°C above 75°C) and ensures reliable operation across -65°C to +200°C storage and operating ranges, with forward voltage ≤1.5 V at 100 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.7 V nominal, min 2.5 V / max 2.9 V - defines precise clamping threshold for low-voltage rail stabilization |
| Tolerance | ±5% - enables predictable voltage margin control without post-production trimming |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling in standard leaded mounting |
| Dynamic Impedance (ZZ) | 100 Ω @ IZ = 5 mA - determines regulation stiffness and output ripple rejection capability |
| Temperature Coefficient (TC) | -3.5 mV/°C - quantifies voltage drift per degree, critical for temperature-stable references |
| Junction Capacitance (CJ) | 255 pF @ VR = 0 V, f = 1 MHz - impacts high-frequency noise coupling and transient response |
| Leakage Current (IR) | ≤100 μA @ VR = 1 V - defines minimum off-state current in protection circuits |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no orientation-specific PCB footprint beyond standard 0.4 mm lead diameter and 2.5 mm body diameter.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower-potential node; reverse bias applied between cathode and anode to activate regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Marked end of DO-35 case; supplies regulated 2.7 V when reverse biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage at low current | Regulates accurately at 5 mA - suitable for micropower bias networks where supply current is constrained |
| Negative temperature coefficient | -3.5 mV/°C enables predictable drift compensation in analog reference chains |
| Low leakage at sub-breakdown voltage | ≤100 μA @ 1 V - minimizes standby power loss in always-on protection circuits |
| DO-35 mechanical standardization | Compatible with legacy through-hole assembly and automated taping equipment per EIA-481 |
Applications
| Low-Voltage Reference | Sensor Biasing |
|---|---|
Use Scenario: Providing stable 2.7 V reference for ADC input scaling in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference for analog front-end conditioning circuitry. Use Value: Enables accurate 10-bit ADC conversion without external precision reference IC, leveraging ±5% tolerance and low TC. | Use Scenario: Biasing silicon photodiodes in optical smoke detectors operating from 3 V coin cells. IC Role / Device Role / Timing Role: Reverse-biased voltage clamp establishing fixed photocurrent measurement node. Use Value: Maintains consistent photodiode reverse bias despite battery voltage decay from 3.0 V to 2.2 V. |
| Overvoltage Clamp | Linear Regulator Shunt |
Use Scenario: Protecting microcontroller GPIO pins against ESD-induced transients on 3.3 V I²C lines. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting voltage excursion to ≤2.9 V during surge events. Use Value: Prevents latch-up in CMOS inputs using 255 pF junction capacitance that does not degrade signal integrity at 400 kHz. | Use Scenario: Stabilizing unregulated 5 V wall adapter output feeding a 2.7 V LDO pre-regulator stage. IC Role / Device Role / Timing Role: Passive shunt regulator absorbing excess current to maintain constant 2.7 V at LDO input. Use Value: Reduces dropout stress on downstream LDO by holding input within 100 mV of target, enabled by 100 Ω ZZ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | Same 3.3 V nominal rating but ±5% tolerance, 500 mW rating, DO-41 package (larger than DO-35) | Requires PCB layout change due to longer leads and 2.7 mm body diameter | Select when higher surge robustness is needed and board space allows larger package |
| BZX55C2V7 | Identical 2.7 V / ±5% / DO-35 spec, but obsolete ON Semiconductor part with discontinued production status | No functional difference; only lifecycle availability differs | Prefer BZX79C2V7_T50R for active production support and guaranteed long-term supply |
Compared with 1N4728A and BZX55C2V7, BZX79C2V7_T50R offers identical electrical performance in the industry-standard DO-35 footprint while ensuring current manufacturing status and traceable sourcing - critical for volume production continuity.
Availability
BZX79C2V7_T50R is available at Aetrix Electronics and suitable for low-power voltage reference, sensor biasing, overvoltage clamping, and linear regulator shunt applications requiring stable component supply across industrial, medical, and consumer electronics programs.
Supply support for BZX79C2V7_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 energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The BZX79 series was designed specifically for general-purpose voltage regulation and transient suppression in cost-sensitive, space-constrained through-hole applications - emphasizing reliability, tight tolerance, and wide temperature range operation.
FAQ
What is the exact Zener voltage range for BZX79C2V7_T50R at 25°C?
The BZX79C2V7_T50R has a specified Zener voltage range of 2.5 V to 2.9 V at 25°C and 5 mA test current, reflecting its ±5% tolerance. This range is measured under thermal equilibrium conditions with 3/8" lead length and TL = 30°C ±1°C. The BZX79C2V7_T50R maintains this specification across its qualified operating temperature range and is validated per ON Semiconductor's BZX79C2V4–BZX79C56 family datasheet Rev. 3.
Does BZX79C2V7_T50R support surface-mount assembly?
No, BZX79C2V7_T50R uses a DO-35 glass axial package with radial leads intended for through-hole mounting only. It lacks solder pads or terminations compatible with reflow or wave soldering processes used for SMT. For surface-mount equivalents, consider the MMBZ5223BS or similar SOD-123 packaged Zeners - but note these differ in voltage tolerance, impedance, and thermal behavior from the BZX79C2V7_T50R.
What is the maximum allowable junction temperature for BZX79C2V7_T50R?
The BZX79C2V7_T50R has an operating junction temperature range of -65°C to +200°C, matching its storage temperature specification. While absolute maximum ratings do not define a single "maximum junction temperature," sustained operation above +150°C may accelerate parametric shift. Derating begins at TL > 75°C (4.0 mW/°C), and thermal design must ensure junction temperature remains within this full range under worst-case power dissipation and ambient conditions for the BZX79C2V7_T50R.
How does the -3.5 mV/°C temperature coefficient affect BZX79C2V7_T50R in precision circuits?
The -3.5 mV/°C temperature coefficient means the BZX79C2V7_T50R's Zener voltage decreases by approximately 3.5 mV for every 1°C rise in junction temperature. In precision circuits, this introduces predictable negative drift - useful when paired with positive-TC components (e.g., resistors or other diodes) to achieve net-zero drift. For the BZX79C2V7_T50R, this coefficient is confirmed at 5 mA test current and is stable across its operating range, enabling first-order temperature compensation without external circuitry.
Is BZX79C2V7_T50R RoHS compliant and halogen-free?
Yes, BZX79C2V7_T50R meets RoHS Directive 2011/65/EU requirements and is halogen-free per ON Semiconductor's product compliance documentation. The DO-35 glass package contains no lead in solderable terminations, and all materials comply with JEDEC J-STD-609A Class 1 definitions. Full compliance data, including SVHC screening and REACH declarations, is available under ON Semiconductor's official material declarations for the BZX79C2V7_T50R.
BZX79C2V7_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):
- 2.7 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 75 µA @ 1 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
BZX79C2V7_T50R FAQ
1.How can I place an order for BZX79C2V7_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C2V7_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 BZX79C2V7_T50R reliable?
The price and inventory of BZX79C2V7_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C2V7_T50R is usually 5 days.
3.What payment methods are accepted for BZX79C2V7_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C2V7_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C2V7_T50R?
BZX79C2V7_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C2V7_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 BZX79C2V7_T50R?
For technical support, including BZX79C2V7_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C2V7_T50R requirements.
6.How does Aetrix verify that BZX79C2V7_T50R is sourced from the original manufacturer or authorized distributors?
All BZX79C2V7_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 BZX79C2V7_T50R meets industry standards.
7.What is the process for return or replacement of BZX79C2V7_T50R?
All BZX79C2V7_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C2V7_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 BZX79C2V7_T50R part is unused and in its original packaging.
Return procedure for BZX79C2V7_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79C2V7_T50R Tags
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MMBZ5240B-7-F
Diodes Incorporated
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