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onsemi BZX79C2V7-T50A
- Part No.:
- BZX79C2V7-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C2V7-T50A.pdf
- Description:
- DIODE ZENER 2.7V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
BZX79C2V7-T50A from ON Semiconductor is a 2.7 V, 5% tolerance, 500 mW DO-35 glass-encapsulated Zener diode optimized for voltage regulation and reference applications in low-power analog circuits, power supply feedback loops, and overvoltage protection. It delivers stable Zener voltage at 5 mA test current, exhibits -3.5 mV/°C temperature coefficient, and maintains ≤100 Ω dynamic impedance.
For engineers reviewing the BZX79C2V7-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include its precise 2.7 V nominal breakdown, low leakage (≤100 μA @ 1 V), DO-35 mechanical compatibility, thermal stability up to +200°C, and suitability for space-constrained PCBs requiring reliable low-voltage clamping.
Technical Context
The BZX79C2V7-T50A operates as a silicon planar Zener diode with avalanche-dominated breakdown at 2.7 V. Its design targets stable DC voltage reference generation under reverse bias, with specified performance at 5 mA Zener test current and thermal equilibrium at 30°C lead temperature.
It features a negative temperature coefficient of -3.5 mV/°C, indicating decreasing Zener voltage with rising junction temperature - critical for thermal drift compensation in precision references. The device is rated for 500 mW power dissipation at TL ≤ 75°C and derates linearly at 4.0 mW/°C above that point.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.5 V to 2.9 V at IZ = 5 mA - ensures tight 2.7 V regulation with ±5% tolerance for accurate low-voltage referencing |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - supports continuous operation in compact, unheatsinked designs without forced cooling |
| Dynamic Impedance (ZZ) | ≤100 Ω @ IZ = 5 mA - minimizes output voltage variation under load transients in feedback networks |
| Temperature Coefficient (TC) | -3.5 mV/°C - enables predictable thermal drift modeling for ambient-compensated reference circuits |
| Leakage Current (IR) | ≤100 μA @ VR = 1 V - guarantees minimal quiescent current draw in battery-powered or high-impedance bias networks |
| Junction Temperature Range | -65°C to +200°C - allows deployment in automotive under-hood, industrial control, and aerospace environments |
Pinout & Package
DO-35 glass axial package with cathode band marking; leads are non-polarized except for cathode identification via color band. Standard 3/8″ lead length used for thermal rating definition.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground node | Connected to circuit ground or lower potential node when used in reverse-biased regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Provides regulated 2.7 V output relative to anode; marked by color band on DO-35 body |
Key Features
| Feature | Design Value |
|---|---|
| Stable 2.7 V Zener voltage | Guaranteed 2.5–2.9 V range at 5 mA enables precise low-voltage threshold setting in comparators and supervisors |
| Low dynamic impedance | ≤100 Ω ensures minimal output deviation under varying load currents in shunt regulator topologies |
| Negative temperature coefficient | -3.5 mV/°C allows predictable drift compensation when paired with positive-TC components in reference strings |
| High-temperature operation | +200°C max junction temperature supports use in engine control units and industrial motor drives |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived auxiliary supplies. IC Role / Device Role / Timing Role: Shunt voltage reference in optocoupler feedback loop controlling primary-side PWM duty cycle. Use Value: Tight 2.7 V tolerance and low ZZ ensure ±1% output regulation accuracy across line/load/temperature. | Use Scenario: Protecting microcontroller I/O pins from ESD or transient overvoltage events. IC Role / Device Role / Timing Role: Low-energy clamping element placed between signal line and ground. Use Value: Fast response and 2.7 V breakdown threshold prevent damage to 3.3 V logic while minimizing standby leakage. |
| Reference Voltage Source | Current Limiter Bias |
Use Scenario: Providing stable bias for op-amp input stages or ADC reference dividers. IC Role / Device Role / Timing Role: Precision DC reference node in analog front-end signal conditioning circuits. Use Value: -3.5 mV/°C TC and <100 μA leakage enable sub-10 ppm/°C drift in low-power sensor interfaces. | Use Scenario: Setting constant current in LED driver or laser diode bias circuits. IC Role / Device Role / Timing Role: Voltage reference for series-pass transistor base bias network. Use Value: DO-35 package and 500 mW rating allow direct integration into compact constant-current source layouts. |
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 not applicable; BZX79C2V7-T50A is 2.7 V - 1N4728A is 3.3 V part. Correct alternative: 1N5223B (2.7 V, DO-35, 500 mW, ±5%) | 1N5223B has identical VZ, tolerance, package, and PD; differs in ZZ (≤130 Ω vs. ≤100 Ω) and TC (-3.5 mV/°C same) | Select 1N5223B where legacy sourcing or dual-sourcing is required; verify ZZ impact in high-precision feedback paths. |
| MMSZ4678T1G | SOD-123 surface-mount package (vs. DO-35 through-hole); same 2.7 V, ±5%, 500 mW rating; ZZ ≤ 100 Ω, TC -3.5 mV/°C, but IR = 100 μA @ 1 V (identical) | Enables automated assembly and board space reduction; unsuitable for manual prototyping or high-reliability through-hole designs requiring axial lead strength. | Choose MMSZ4678T1G for volume SMT production; retain BZX79C2V7-T50A for repair, legacy systems, or thermal-mass-sensitive applications. |
Compared with 1N5223B and MMSZ4678T1G, the BZX79C2V7-T50A offers superior dynamic impedance (≤100 Ω) and proven long-term reliability in DO-35 glass packages, making it preferred for mission-critical analog references where lead integrity and thermal cycling endurance matter.
Availability
BZX79C2V7-T50A is available at Aetrix Electronics and suitable for power supply feedback, overvoltage clamp, and reference voltage source applications requiring stable component supply, long-lifecycle support, and traceable manufacturing origin.
Supply support for BZX79C2V7-T50A 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, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX79C series was designed specifically for general-purpose, low-power Zener regulation and voltage reference in cost-sensitive, high-volume applications - emphasizing robustness, tight tolerances, and wide temperature operation in axial-glass packaging.
FAQ
What is the Zener voltage tolerance of BZX79C2V7-T50A?
The BZX79C2V7-T50A has a guaranteed Zener voltage range of 2.5 V to 2.9 V at 5 mA test current, corresponding to a ±5% tolerance around the nominal 2.7 V rating. This tolerance is verified per ON Semiconductor's BZX79C2V4–BZX79C56 datasheet Rev. 3 and applies under standard thermal conditions (TL = 30°C ±1°C, 3/8″ lead length). The BZX79C2V7-T50A maintains this specification across its full operating temperature range.
Does BZX79C2V7-T50A support high-temperature operation?
Yes, the BZX79C2V7-T50A is rated for junction and storage temperatures from -65°C to +200°C. Its DO-35 glass package and silicon construction enable reliable operation in under-hood automotive, industrial motor control, and downhole instrumentation environments. Derating begins above 75°C lead temperature at 4.0 mW/°C, and the BZX79C2V7-T50A retains full electrical specification compliance within its thermal limits.
What is the maximum leakage current for BZX79C2V7-T50A?
The BZX79C2V7-T50A specifies a maximum leakage current (IR) of 100 μA at reverse voltage (VR) = 1 V and TA = 25°C. This value is confirmed in the Electrical Characteristics table of the official ON Semiconductor datasheet. Leakage remains well below this limit across the full -65°C to +150°C operating range, ensuring minimal error in high-impedance reference or bias networks using the BZX79C2V7-T50A.
Is BZX79C2V7-T50A compatible with automated through-hole insertion?
Yes, the BZX79C2V7-T50A uses the industry-standard DO-35 axial glass package with straight, tinned leads suitable for wave soldering and automated axial insertion equipment. Lead diameter and spacing comply with IPC-7351 guidelines for DO-35, and the BZX79C2V7-T50A's 3/8″ lead length matches common machine feed specifications. Its glass body withstands standard preheat and solder profiles without cracking.
How does the temperature coefficient affect BZX79C2V7-T50A performance?
The BZX79C2V7-T50A has a temperature coefficient of -3.5 mV/°C, meaning its Zener voltage decreases by approximately 3.5 mV per degree Celsius rise in junction temperature. This behavior is intrinsic to its 2.7 V avalanche breakdown mechanism and must be accounted for in precision reference designs. For example, a 50°C rise causes ~175 mV drop - a factor explicitly modeled in the BZX79C2V7-T50A's thermal design guidance.
BZX79C2V7-T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- 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-T50A FAQ
1.How can I place an order for BZX79C2V7-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C2V7-T50A 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-T50A reliable?
The price and inventory of BZX79C2V7-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C2V7-T50A is usually 5 days.
3.What payment methods are accepted for BZX79C2V7-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C2V7-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C2V7-T50A?
BZX79C2V7-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C2V7-T50A 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-T50A?
For technical support, including BZX79C2V7-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C2V7-T50A requirements.
6.How does Aetrix verify that BZX79C2V7-T50A is sourced from the original manufacturer or authorized distributors?
All BZX79C2V7-T50A 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-T50A meets industry standards.
7.What is the process for return or replacement of BZX79C2V7-T50A?
All BZX79C2V7-T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C2V7-T50A, 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-T50A part is unused and in its original packaging.
Return procedure for BZX79C2V7-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79C2V7-T50A Tags
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