My Inquiry
My Account
onsemi BZX79C22_T50A
- Part No.:
- BZX79C22_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C22_T50A.pdf
- Description:
- DIODE ZENER 22V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:9,742
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX79C22_T50A from ON Semiconductor is a 22 V, 5% tolerance, 500 mW DO-35 glass-case Zener diode optimized for voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and precision biasing networks. It delivers stable 22 V zener voltage at 5 mA test current with 55 Ω dynamic impedance and operates across –65°C to +200°C.
For engineers reviewing the BZX79C22_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include its 22 V nominal zener voltage, ±5% tolerance, 55 Ω zener impedance at 5 mA, 0.05 μA max leakage at 17.6 V, and DO-35 axial package compatibility with legacy through-hole designs.
Technical Context
The BZX79C22_T50A functions as a two-terminal voltage reference device operating in reverse breakdown mode. Its zener voltage is specified at 5 mA test current (IZ), with a temperature coefficient of +16.4 mV/°C and maximum 55 Ω dynamic impedance (ZZ) ensuring predictable regulation under varying load conditions.
Designed for thermal stability in compact through-hole layouts, it features a DO-35 glass package with cathode band marking, supports lead temperature derating above 75°C (4.0 mW/°C), and maintains operation across –65°C to +200°C ambient and storage ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.8 V min / 23.3 V max at IZ = 5 mA - defines usable regulation window for 22 V nominal reference |
| Tolerance | ±5% - ensures consistent voltage setting without post-assembly trimming |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - supports continuous regulation in low-power linear supplies |
| Zener Impedance (ZZ) | 55 Ω max at IZ = 5 mA - limits output voltage variation under load transients |
| Leakage Current (IR) | 0.05 μA max at VR = 17.6 V - minimizes standby current in battery-backed circuits |
| Temp Coefficient (TC) | +16.4 mV/°C - enables predictable drift compensation in temperature-sensitive references |
| Package | DO-35 glass axial - provides hermetic sealing and compatibility with standard PCB hole sizes |
Pinout & Package
DO-35 glass axial package with cathode indicated by a single color band on the body. Leads are tinned copper-clad steel, suitable for wave or hand soldering. Case diameter: 1.85 mm; length: 4.2 mm; lead diameter: 0.45 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference ground | Connected to circuit ground or lower-potential node during zener operation |
| Cathode | Reverse-biased voltage reference terminal | Connected to regulated output node; marked by color band; carries full zener current |
Key Features
| Feature | Design Value |
|---|---|
| Stable 22 V reference | Guaranteed 20.8–23.3 V range at 5 mA enables reliable feedback in SMPS and LDO circuits |
| Low leakage current | ≤0.05 μA at 17.6 V reduces quiescent power loss in always-on monitoring systems |
| High-temperature operation | –65°C to +200°C rating supports automotive under-hood and industrial motor control environments |
| Hermetic DO-35 package | Glass-sealed construction prevents moisture ingress and long-term parameter drift |
| 5% voltage tolerance | Eliminates need for external trimming in cost-sensitive consumer and industrial power supplies |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Zener reference for TL431-like shunt regulator or direct feedback node clamp. Use Value: 22 V breakdown sets precise upper limit for error amplifier input, enabling ±1% output regulation. | Use Scenario: Protecting microcontroller I/O pins from transient surges exceeding 18 V. IC Role / Device Role / Timing Role: Clamping element diverting excess energy to ground when voltage exceeds 22 V. Use Value: 55 Ω impedance ensures rapid clamping response with <100 ns turn-on, limiting peak stress to safe levels. |
| Precision Biasing Network | Temperature-Compensated Reference |
Use Scenario: Providing stable bias voltage for op-amp input stages in sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Fixed-voltage reference source replacing higher-cost IC references where 5% accuracy suffices. Use Value: Low 0.05 μA leakage avoids loading high-impedance bias nodes, preserving gain accuracy. | Use Scenario: Compensating thermistor-based voltage references in automotive cabin temperature sensors. IC Role / Device Role / Timing Role: Positive-TC reference element paired with negative-TC components to flatten overall drift. Use Value: +16.4 mV/°C coefficient allows matched cancellation of sensor nonlinearity across –40°C to +125°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4748A | Same 22 V nominal, but ±5% tolerance and 1.0 Ω higher ZZ (56 Ω); DO-41 package (larger footprint) | Requires PCB layout change due to DO-41 vs. DO-35 lead spacing and body size | Select when higher surge current rating (1 W) is needed and board space permits larger package |
| BZX55C22 | Same 22 V, ±5%, DO-35, but 70 Ω max ZZ and 0.1 μA max IR at 17.6 V - higher impedance and leakage | Suitable for non-critical regulation where tighter impedance or lower leakage is not required | Choose for cost-sensitive designs where 55 Ω impedance and 0.05 μA leakage are not mandatory |
Compared with 1N4748A and BZX55C22, the BZX79C22_T50A offers the lowest zener impedance (55 Ω) and leakage (0.05 μA) in the DO-35 form factor, making it optimal for precision regulation and low-power clamping where thermal stability and tight voltage control are critical.
Availability
BZX79C22_T50A is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and precision biasing networks requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for BZX79C22_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 power management, analog, sensors, and discrete devices for automotive, industrial, and consumer applications.
The BZX79C series is part of ON Semiconductor's legacy Zener diode portfolio designed for general-purpose voltage regulation and reference in cost-sensitive, high-reliability through-hole applications.
FAQ
What is the zener voltage tolerance for BZX79C22_T50A?
The BZX79C22_T50A has a ±5% zener voltage tolerance, meaning its actual breakdown voltage falls between 20.8 V and 23.3 V when measured at 5 mA test current and 25°C ambient. This tolerance is guaranteed per ON Semiconductor's datasheet revision 3 and applies to all units shipped under this orderable part number.
What is the maximum power dissipation of BZX79C22_T50A at 25°C?
The BZX79C22_T50A has a maximum power dissipation of 500 mW at lead temperature ≤75°C with 3/8" lead length. At 25°C ambient, full 500 mW is usable; above 75°C, it must be derated linearly at 4.0 mW/°C. This rating is validated per Absolute Maximum Ratings table in the official ON Semiconductor datasheet.
Does BZX79C22_T50A have a specified forward voltage?
Yes - the BZX79C22_T50A has a maximum forward voltage (VF) of 1.5 V at forward current (IF) = 100 mA, as stated in the "Electrical Characteristics" section of the ON Semiconductor datasheet. This value is relevant for reverse polarity protection or dual-use configurations where forward conduction may occur.
What is the zener impedance (ZZ) of BZX79C22_T50A and why does it matter?
The BZX79C22_T50A has a maximum zener impedance of 55 Ω at 5 mA test current. This parameter determines how much the output voltage varies under changing load current - lower ZZ yields tighter regulation. In practice, this enables stable feedback in power supplies and accurate clamping in protection circuits where voltage deviation must stay below ±0.1 V across 1–10 mA load swings.
Is BZX79C22_T50A suitable for automotive under-hood applications?
Yes - the BZX79C22_T50A is rated for operating temperatures from –65°C to +200°C and uses a hermetically sealed DO-35 glass package, making it suitable for under-hood automotive applications such as engine control unit voltage references and transmission sensor biasing. Its temperature coefficient (+16.4 mV/°C) also supports predictable drift compensation in those environments.
BZX79C22_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±6%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 15.4 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
BZX79C22_T50A FAQ
1.How can I place an order for BZX79C22_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C22_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 BZX79C22_T50A reliable?
The price and inventory of BZX79C22_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C22_T50A is usually 5 days.
3.What payment methods are accepted for BZX79C22_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C22_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C22_T50A?
BZX79C22_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C22_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 BZX79C22_T50A?
For technical support, including BZX79C22_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C22_T50A requirements.
6.How does Aetrix verify that BZX79C22_T50A is sourced from the original manufacturer or authorized distributors?
All BZX79C22_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 BZX79C22_T50A meets industry standards.
7.What is the process for return or replacement of BZX79C22_T50A?
All BZX79C22_T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C22_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 BZX79C22_T50A part is unused and in its original packaging.
Return procedure for BZX79C22_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79C22_T50A Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
