My Inquiry
My Account
onsemi BZX85C4V7_T50R
- Part No.:
- BZX85C4V7_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
BZX85C4V7_T50R.pdf
- Description:
- DIODE ZENER 4.7V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:2,704
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX85C4V7_T50R from onsemi is a 4.7 V, ±5% tolerance, 1.0 W axial-leaded Zener diode in DO-41 glass package, rated for 45 Ω dynamic impedance at 5 mA test current and 1 μA leakage at 1.5 V reverse voltage, used for precision voltage regulation and overvoltage protection in power supply feedback paths.
For engineers reviewing the BZX85C4V7_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, power derating above 50°C, thermal resistance, cathode identification via band marking, and compatibility with through-hole PCB assembly processes.
Technical Context
This device operates as a two-terminal silicon junction diode optimized for stable reverse-breakdown behavior. Its 4.7 V nominal zener voltage is specified at 5 mA test current (IZ), with 45 Ω zener impedance (ZZ) and 600 Ω knee impedance (ZZK) at 1 mA, ensuring predictable clamping across load and temperature variations.
The DO-41 glass package provides hermetic sealing and a maximum junction temperature of +200°C, supporting operation in industrial environments. Power dissipation is rated at 1.0 W at 25°C ambient, derating linearly by 6.67 mW/°C above 50°C, with storage temperature range from –65°C to +200°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.4 V to 5.0 V at IZ = 5 mA - defines regulated output voltage window under standard test conditions |
| Tolerance | ±5% - determines worst-case voltage deviation in closed-loop feedback or reference circuits |
| Power Dissipation (PD) | 1.0 W at TA = 25°C - sets maximum continuous power handling before thermal shutdown or degradation |
| Zener Impedance (ZZ) | 45 Ω @ IZ = 5 mA - indicates AC voltage regulation stability under varying load currents |
| Leakage Current (IR) | 1 μA max @ VR = 1.5 V - ensures minimal standby current in low-power bias networks |
| Forward Voltage (VF) | 1.2 V max @ IF = 200 mA - defines conduction threshold when used in series polarity protection |
| Operating Temp Range | –65°C to +200°C - supports deployment in automotive engine compartments and industrial motor drives |
Pinout & Package
DO-41 glass axial package with cathode identified by a single color band near one lead end. Leads are tinned copper-clad steel, suitable for wave soldering and hand assembly. Package conforms to JEDEC DO-204AL standard, with body diameter 2.03–2.72 mm and overall length ≥25.4 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive terminal in forward bias; connected to lower-potential node in zener regulation | Accepts current flow toward cathode during reverse breakdown; must be routed to ground or return path |
| Cathode | Negative terminal in forward bias; marked with color band; connected to regulated output node | Serves as voltage reference point; reverse-biased connection enables stable 4.7 V clamping |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass encapsulation | Enables long-term reliability in humid or corrosive environments without moisture ingress risk |
| ±5% voltage tolerance | Supports tight regulation in analog references where 0.235 V total spread is acceptable |
| 1.0 W power rating | Allows direct use in 5–12 V supply rails without external heat sinking in most PCB layouts |
| Low knee impedance (600 Ω @ 1 mA) | Ensures usable regulation even at microamp-level bias currents in ultra-low-power monitoring |
| Cathode band marking | Enables unambiguous orientation during manual or automated placement on through-hole PCBs |
Applications
| Switch-Mode Power Supply Feedback | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Regulates error amplifier reference in isolated flyback converter feedback loop. IC Role / Device Role / Timing Role: Zener reference element setting optocoupler LED current threshold. Use Value: Maintains ±5% output voltage accuracy across line/load/temperature with 45 Ω dynamic impedance. |
Use Scenario: Generates clean reset signal for ARM Cortex-M0+ MCU during brown-out events. IC Role / Device Role / Timing Role: Voltage threshold detector enabling POR and reset assertion below 4.4 V. Use Value: Delivers sub-1 μA leakage at 1.5 V to minimize battery drain in always-on backup domains. |
| Industrial Sensor Signal Conditioning | Overvoltage Clamp for RS-485 Transceivers |
Use Scenario: Stabilizes excitation voltage for 4–20 mA loop-powered pressure transmitters. IC Role / Device Role / Timing Role: Precision shunt regulator providing 4.7 V reference to op-amp bias network. Use Value: Achieves <0.5% drift over –40°C to +85°C due to DO-41 thermal mass and low ZZ. |
Use Scenario: Protects MAX13487E RS-485 receiver inputs against ESD and surge transients. IC Role / Device Role / Timing Role: Bidirectional transient suppressor clamping common-mode voltage to ±5 V. Use Value: Limits fault energy with 1.0 W peak dissipation and fast 10 ns response to 8/20 μs surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4732A | Same 4.7 V nominal, but ±5% tolerance and 1.0 W rating; higher ZZ = 9 Ω @ 49 mA (not 5 mA) | Optimized for higher-current regulation; less stable at low bias currents (<1 mA) | Prefer BZX85C4V7_T50R when operating near 1–5 mA or requiring tighter thermal coefficient |
| MMSZ4700T1G | SOD-123 surface-mount package; same 4.7 V ±5%, but 500 mW rating and 100 Ω ZZ @ 10 mA | Designed for space-constrained PCBs; unsuitable for high-power dissipation or manual repair | Choose BZX85C4V7_T50R for through-hole assembly, thermal robustness, or legacy design reuse |
Compared with 1N4732A and MMSZ4700T1G, BZX85C4V7_T50R offers superior low-current regulation stability (600 Ω knee impedance at 1 mA), axial DO-41 mechanical ruggedness, and higher ambient power handling-making it optimal for industrial power supplies and sensor interfaces where reliability trumps miniaturization.
Availability
BZX85C4V7_T50R is available at Aetrix Electronics and suitable for industrial power supplies, embedded sensor modules, and RS-485 communication interfaces requiring stable component supply and long-lifecycle support.
Supply support for BZX85C4V7_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
onsemi (formerly 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.
BZX85C4V7_T50R belongs to the BZX85C series of general-purpose Zener diodes designed for cost-sensitive, high-reliability voltage regulation and protection in consumer, industrial, and computing power systems.
FAQ
What is the zener voltage tolerance for BZX85C4V7_T50R?
The BZX85C4V7_T50R has a nominal zener voltage of 4.7 V with a guaranteed tolerance of ±5%, meaning its actual breakdown voltage falls between 4.4 V and 5.0 V when measured at 5 mA test current and 25°C ambient temperature. This tolerance is confirmed in the official onsemi datasheet revision 2 (October 2017) and applies to all units within the BZX85C4V7_T50R orderable part number.
Does BZX85C4V7_T50R have a defined forward voltage specification?
Yes, BZX85C4V7_T50R specifies a maximum forward voltage (VF) of 1.2 V at 200 mA forward current, per the onsemi datasheet. This parameter is relevant when the device is used in forward-biased configurations-for example, as a polarity protection diode-and confirms compatibility with standard silicon diode drive requirements in mixed-signal circuits.
What is the thermal derating behavior of BZX85C4V7_T50R above 50°C?
BZX85C4V7_T50R derates linearly at 6.67 mW/°C above an ambient temperature of 50°C. Starting from its full 1.0 W rating at 25°C, power capability reduces to approximately 867 mW at 70°C and 733 mW at 90°C. This derating curve is defined in the Absolute Maximum Ratings table and must be applied in thermal design for enclosed or high-ambient environments.
How is the cathode identified on BZX85C4V7_T50R?
The cathode of BZX85C4V7_T50R is marked by a single color band located near one lead end of the DO-41 glass package. This band aligns with JEDEC DO-204AL mechanical standards and is consistently placed on the cathode side across all BZX85C-series devices, enabling reliable orientation during both automated insertion and manual soldering.
Is BZX85C4V7_T50R suitable for use in automotive under-hood applications?
BZX85C4V7_T50R supports an operating temperature range of –65°C to +200°C and uses hermetically sealed glass packaging, making it technically capable of under-hood deployment. However, it is not AEC-Q200 qualified; for automotive-critical functions, designers should verify system-level qualification testing or consider AEC-Q200–rated alternatives like the SZBZX85C4V7.
BZX85C4V7_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 4.7 V
- Tolerance:
- ±6%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 13 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1.5 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
BZX85C4V7_T50R FAQ
1.How can I place an order for BZX85C4V7_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX85C4V7_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 BZX85C4V7_T50R reliable?
The price and inventory of BZX85C4V7_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX85C4V7_T50R is usually 5 days.
3.What payment methods are accepted for BZX85C4V7_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX85C4V7_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX85C4V7_T50R?
BZX85C4V7_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX85C4V7_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 BZX85C4V7_T50R?
For technical support, including BZX85C4V7_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX85C4V7_T50R requirements.
6.How does Aetrix verify that BZX85C4V7_T50R is sourced from the original manufacturer or authorized distributors?
All BZX85C4V7_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 BZX85C4V7_T50R meets industry standards.
7.What is the process for return or replacement of BZX85C4V7_T50R?
All BZX85C4V7_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX85C4V7_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 BZX85C4V7_T50R part is unused and in its original packaging.
Return procedure for BZX85C4V7_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX85C4V7_T50R 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…
