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onsemi BZX79C7V5-T50A
- Part No.:
- BZX79C7V5-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C7V5-T50A.pdf
- Description:
- DIODE ZENER 7.5V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
BZX79C7V5-T50A from ON Semiconductor is a 7.5 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 BZX79C7V5-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance (±5%), dynamic impedance (15 Ω @ 5 mA), temperature coefficient (+2.5 mV/°C), leakage current (1 µA @ 5 V), and thermal derating (4.0 mW/°C above 75°C).
Technical Context
This device operates as a two-terminal voltage reference diode with reverse-biased breakdown behavior. Its zener voltage is specified at 5 mA test current, with a typical dynamic impedance of 15 Ω and a positive temperature coefficient of +2.5 mV/°C - indicating increasing VZ with rising junction temperature.
The DO-35 glass package provides hermetic sealing and stable long-term performance under industrial temperature conditions (–65°C to +200°C). It exhibits 80 pF capacitance at 0 V and 1 MHz, limiting high-frequency noise suppression capability but suitable for DC and low-frequency regulation tasks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.0 V to 7.9 V at IZ = 5 mA - defines regulated output range for feedback or clamping |
| Tolerance | ±5% - ensures predictable voltage setpoint across production lots |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling before thermal derating |
| Dynamic Impedance (ZZ) | 15 Ω max @ 5 mA - determines regulation stiffness and load-induced voltage deviation |
| Leakage Current (IR) | 1 µA max @ VR = 5 V - defines off-state conduction loss in series-shunt configurations |
| Temperature Coefficient (TC) | +2.5 mV/°C - quantifies VZ drift per degree rise, critical for temperature-stable references |
| Junction Temperature Range | –65°C to +200°C - supports operation in harsh automotive and industrial environments |
Pinout & Package
DO-35 glass axial package with cathode band marking; two-terminal device requiring no external biasing or control signals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to lower potential side in shunt regulator configuration |
| Cathode | Zener breakdown terminal / Regulated output node | Connected to input rail via series resistor; delivers stable 7.5 V reference |
Key Features
| Feature | Design Value |
|---|---|
| Hermetically sealed DO-35 glass package | Ensures long-term parameter stability and moisture resistance without conformal coating |
| ±5% zener voltage tolerance | Reduces need for post-production trimming in cost-sensitive consumer power supplies |
| Low dynamic impedance (15 Ω) | Minimizes output voltage variation under varying load currents up to 20 mA |
| Positive temperature coefficient (+2.5 mV/°C) | Enables predictable compensation when paired with negative-TC components in reference designs |
| Rated for –65°C to +200°C operation | Validates use in under-hood automotive modules and industrial motor drive control boards |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Used in TL431-based secondary-side feedback loop to regulate 12 V output in AC/DC adapters. IC Role / Device Role / Timing Role: Provides precise 7.5 V reference to comparator input, enabling ±1% output voltage accuracy. Use Value: Tight 5% VZ tolerance and low ZZ ensure minimal load regulation error across line and load variations. | Use Scenario: Placed across microcontroller I/O pins to limit transient spikes from relay coil back-EMF. IC Role / Device Role / Timing Role: Acts as passive shunt clamp, diverting >7.9 V transients to ground before IC damage occurs. Use Value: Fast 1 ns response time (inherent to PN junction) and 500 mW surge rating protect against 100 ns–1 µs spikes. |
| Industrial Sensor Signal Conditioning | Programmable Voltage Reference |
Use Scenario: Stabilizes excitation voltage for 4–20 mA current-loop pressure sensors operating at 7.5 V. IC Role / Device Role / Timing Role: Supplies low-noise, temperature-compensated bias to sensor bridge circuitry. Use Value: +2.5 mV/°C TC allows predictable offset correction in firmware; 1 µA leakage avoids loading high-impedance sensor outputs. | Use Scenario: Paired with DAC output to generate accurate 7.5 V calibration reference in multimeter front-end ADC stage. IC Role / Device Role / Timing Role: Serves as secondary reference to verify and trim DAC full-scale error. Use Value: 15 Ω ZZ ensures <100 µV shift when sourcing 6.7 µA into ADC reference input, meeting 16-bit accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4734A | Same 7.5 V nominal, ±5% tolerance, but higher ZZ (10 Ω typ vs. 15 Ω max) and lower PD (1 W vs. 500 mW) | Higher power dissipation enables use in higher-current shunt regulators; larger DO-41 package requires PCB rework | Select 1N4734A only if ≥1 W power handling is required and board layout accommodates DO-41 footprint |
| BZX55C7V5 | Same VZ and tolerance, but higher ZZ (30 Ω max), wider temp range (–65°C to +175°C), and different DO-35 marking convention | Slightly degraded regulation stiffness; preferred where legacy BZX55 family compatibility is mandated by design history | Choose BZX55C7V5 only for drop-in replacement in existing BZX55-based designs; not recommended for new designs targeting lowest ZZ |
Compared with 1N4734A and BZX55C7V5, the BZX79C7V5-T50A offers optimized balance of low dynamic impedance, industry-standard DO-35 footprint, and extended high-temperature capability - making it ideal for space-constrained, thermally demanding industrial and automotive voltage reference nodes.
Availability
BZX79C7V5-T50A is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and industrial sensor signal conditioning requiring stable component supply and consistent parametric performance across manufacturing batches.
Supply support for BZX79C7V5-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, and cloud infrastructure markets.
The BZX79C series was developed as a general-purpose, glass-passivated Zener diode family targeting cost-sensitive, high-reliability voltage reference and regulation applications across consumer, industrial, and automotive electronics.
FAQ
What is the exact zener voltage range for BZX79C7V5-T50A at 5 mA test current?
The BZX79C7V5-T50A has a guaranteed zener voltage range of 7.0 V to 7.9 V when measured at IZ = 5 mA and TL = 30°C ± 1°C with 3/8″ lead length. This 5% tolerance window reflects the device's specification per ON Semiconductor's BZX79C2V4–BZX79C56 datasheet Rev. 3 (November 2017), and applies directly to the BZX79C7V5-T50A variant.
Does BZX79C7V5-T50A have a cathode band, and how is polarity identified?
Yes, the BZX79C7V5-T50A uses a DO-35 glass package with a visible cathode band - a single dark stripe near one end of the cylindrical body. Per ON Semiconductor's marking standard, this band denotes the cathode terminal, which must be connected toward the higher-potential side in shunt regulation or clamping configurations. The anode is the unmarked end.
What is the maximum allowable power dissipation for BZX79C7V5-T50A at 100°C ambient?
At 100°C ambient, the BZX79C7V5-T50A 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 500 mW − (4.0 mW/°C × 25°C) = 400 mW. This assumes proper lead length (3/8″) and still-air conditions per the Absolute Maximum Ratings table in the official datasheet.
Can BZX79C7V5-T50A be used in place of BZX55C7V5 in an existing design?
The BZX79C7V5-T50A is not a direct pin-compatible replacement for BZX55C7V5 due to differences in dynamic impedance (15 Ω max vs. 30 Ω max) and temperature coefficient (+2.5 mV/°C vs. +3.2 mV/°C). While both share DO-35 packaging and 7.5 V nominal rating, circuit-level validation is required - especially in precision reference applications where ZZ and TC impact accuracy.
What is the leakage current specification for BZX79C7V5-T50A at 5 V reverse bias?
The BZX79C7V5-T50A specifies a maximum leakage current (IR) of 1 µA when reverse biased at VR = 5 V and measured at TA = 25°C. This value is confirmed in the Electrical Characteristics table of the ON Semiconductor BZX79C2V4–BZX79C56 datasheet, and reflects the device's ability to remain effectively non-conductive below its zener knee voltage.
BZX79C7V5-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):
- 7.5 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 15 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 5 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
BZX79C7V5-T50A FAQ
1.How can I place an order for BZX79C7V5-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C7V5-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 BZX79C7V5-T50A reliable?
The price and inventory of BZX79C7V5-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C7V5-T50A is usually 5 days.
3.What payment methods are accepted for BZX79C7V5-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C7V5-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C7V5-T50A?
BZX79C7V5-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C7V5-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 BZX79C7V5-T50A?
For technical support, including BZX79C7V5-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C7V5-T50A requirements.
6.How does Aetrix verify that BZX79C7V5-T50A is sourced from the original manufacturer or authorized distributors?
All BZX79C7V5-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 BZX79C7V5-T50A meets industry standards.
7.What is the process for return or replacement of BZX79C7V5-T50A?
All BZX79C7V5-T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C7V5-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 BZX79C7V5-T50A part is unused and in its original packaging.
Return procedure for BZX79C7V5-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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