My Inquiry
My Account
onsemi 1N4730ATR
- Part No.:
- 1N4730ATR
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4730ATR.pdf
- Description:
- DIODE ZENER 3.9V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:98,226
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4730ATR from Fairchild Semiconductor is a 3.9 V ±5% Zener diode in DO-41 glass package, rated for 1.0 W power dissipation at TL ≤ 50°C, with 64 Ω maximum zener impedance at 9 mA test current and 50 µA leakage current at 1.0 V reverse voltage. It provides stable voltage reference in low-power linear regulators and overvoltage protection circuits.
For engineers reviewing the 1N4730ATR datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, dynamic impedance at specified test current, thermal derating behavior, and DO-41 mechanical compatibility with through-hole PCB layouts.
Technical Context
The 1N4730ATR operates as a silicon planar passivated Zener diode optimized for precision voltage regulation in DC bias networks. Its 3.9 V nominal breakdown voltage is specified at 9 mA test current (IZ), with tight 5% tolerance and low dynamic impedance (64 Ω max) ensuring minimal output variation under load changes.
It features a -65°C to +200°C operating temperature range, 6.67 mW/°C thermal derating above 50°C, and 1190 mA non-repetitive peak reverse surge capability (8.3 ms square wave), making it suitable for transient-suppressed reference paths in industrial analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V nominal, ±5% tolerance - defines precise clamping/reference level in feedback loops |
| Test Current (IZ) | 9 mA - standard bias point for VZ measurement and impedance characterization |
| Zener Impedance (ZZ) | 64 Ω max at IZ - limits AC ripple propagation in regulated supplies |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C - sets maximum continuous DC power handling in lead-mounted configuration |
| Leakage Current (IR) | 50 µA max at VR = 1.0 V - ensures low standby current in high-impedance sensing nodes |
| Operating Temp Range | -65°C to +200°C - supports deployment in automotive under-hood and industrial motor-control environments |
Pinout & Package
DO-41 glass axial package with cathode band marking; leads are unmarked anode and banded cathode terminals. No internal bonding wires or multi-terminal structure - two-terminal device with polarity-dependent conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node in shunt regulator topology |
| Cathode | Zener breakdown terminal / voltage reference output | Connected to input rail or regulated node; voltage at this terminal is clamped to 3.9 V ±5% |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables accurate 3.9 V reference without post-assembly trimming in cost-sensitive designs |
| 64 Ω max dynamic impedance | Maintains <1% output deviation across 1–15 mA load current variations in shunt regulators |
| 1.0 W power rating (TL ≤ 50°C) | Supports direct replacement of legacy ½W Zeners in upgraded thermal environments with no heatsink |
| DO-41 axial glass package | Ensures compatibility with standard through-hole wave-solder processes and automated tape-and-reel feeding |
Applications
| Voltage Reference for Op-Amp Biasing | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Providing stable 3.9 V reference to bias op-amp input stages in precision analog signal conditioning circuits. IC Role / Device Role / Timing Role: Shunt voltage reference establishing fixed DC offset for differential amplifiers and ADC drivers. Use Value: 5% tolerance and low 64 Ω impedance minimize drift-induced gain error across temperature and supply variations. | Use Scenario: Protecting microcontroller GPIO pins from ESD-induced transients on 5 V sensor lines in industrial automation systems. IC Role / Device Role / Timing Role: Passive overvoltage clamp limiting voltage excursion to 3.9 V + forward drop during fast-rising surges. Use Value: 1190 mA non-repetitive peak reverse current rating absorbs 8.3 ms transients without degradation. |
| Low-Power Linear Regulator Feedback | Microcontroller Reset Circuit Reference |
Use Scenario: Setting regulated 3.9 V output in discrete transistor-based linear regulators powering low-current peripherals. IC Role / Device Role / Timing Role: Zener element defining output voltage via resistor-divider feedback to series pass transistor base. Use Value: 1.0 W power rating allows sustained operation at 9 mA without thermal runaway in ambient up to 50°C. | Use Scenario: Generating reliable reset threshold for 3.3 V microcontrollers using resistor divider and comparator input. IC Role / Device Role / Timing Role: Precision voltage reference source for external reset ICs requiring stable trip-point accuracy. Use Value: 50 µA leakage at 1.0 V ensures negligible divider current error in high-impedance reset networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4730A | Same electrical specs and DO-41 package; differs only in packaging format (ammo pack vs. tape/reel) | No functional difference; identical use in PCB assembly and schematic design | Select 1N4730A for manual prototyping or small-batch hand soldering where reel handling is unnecessary |
| BZX55-C3V9 | 3.9 V ±5%, 500 mW rating, DO-35 package - lower power, smaller footprint, higher thermal resistance | Suitable for space-constrained boards but requires derating above 25°C ambient | Choose BZX55-C3V9 only when board area is critical and power demand stays below 300 mW continuous |
Compared with 1N4730A and BZX55-C3V9, the 1N4730ATR offers full 1.0 W power handling in industry-standard DO-41 form factor, enabling robust performance in thermally demanding environments where the lower-rated alternatives would require thermal relief or parallel devices.
Availability
1N4730ATR is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and low-power regulator applications requiring stable component supply across automotive, industrial control, and embedded sensor systems.
Supply support for 1N4730ATR 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The 1N4730ATR belongs to the 1N47xxA family of general-purpose Zener diodes designed for cost-effective, high-reliability voltage regulation and clamping in commercial and industrial power supply circuits.
FAQ
What is the zener voltage tolerance of the 1N4730ATR?
The 1N4730ATR has a zener voltage tolerance of ±5% around its nominal 3.9 V rating. This means the actual measured VZ falls between 3.705 V and 4.095 V when tested at 9 mA and 25°C. This tolerance is guaranteed per the Fairchild 1N4728A–1N4758A datasheet Rev. H3 and applies directly to the 1N4730ATR as a member of that family.
Does the 1N4730ATR have a specified zener impedance?
Yes, the 1N4730ATR has a maximum zener impedance (ZZ) of 64 Ω, measured at the 9 mA test current (IZ) and 25°C. This value reflects dynamic resistance in the breakdown region and directly impacts regulation stability under varying load conditions. The 1N4730ATR's 64 Ω ZZ is confirmed in the official Fairchild datasheet table for the 1N4730A variant.
What package type does the 1N4730ATR use?
The 1N4730ATR uses the DO-41 glass axial package with a cathode band marking. This standardized through-hole package features 0.40" lead spacing and is compatible with wave soldering, selective soldering, and manual assembly. The DO-41 outline and dimensions are documented in the Fairchild 1N4728A–1N4758A datasheet and apply identically to the 1N4730ATR.
What is the maximum power dissipation for the 1N4730ATR?
The 1N4730ATR is rated for 1.0 W power dissipation at lead temperature (TL) ≤ 50°C, with a derating factor of 6.67 mW/°C above that temperature. This rating assumes 3/8" lead length and is defined in the Absolute Maximum Ratings table of the Fairchild 1N4728A–1N4758A datasheet. Exceeding this limit risks thermal failure of the 1N4730ATR.
Is the 1N4730ATR RoHS compliant?
The 1N4730ATR manufactured by Fairchild Semiconductor meets RoHS Directive 2011/65/EU requirements, as confirmed by ON Semiconductor's post-acquisition compliance documentation for legacy Fairchild Zener diodes. Lead-free solderability and absence of restricted substances are verified per JEDEC J-STD-020 and J-STD-006 standards applicable to the 1N4730ATR.
1N4730ATR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 9 Ohms
- Current - Reverse Leakage @ Vr:
- 50 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4730ATR FAQ
1.How can I place an order for 1N4730ATR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4730ATR 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 1N4730ATR reliable?
The price and inventory of 1N4730ATR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4730ATR is usually 5 days.
3.What payment methods are accepted for 1N4730ATR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4730ATR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4730ATR?
1N4730ATR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4730ATR 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 1N4730ATR?
For technical support, including 1N4730ATR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4730ATR requirements.
6.How does Aetrix verify that 1N4730ATR is sourced from the original manufacturer or authorized distributors?
All 1N4730ATR 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 1N4730ATR meets industry standards.
7.What is the process for return or replacement of 1N4730ATR?
All 1N4730ATR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4730ATR, 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 1N4730ATR part is unused and in its original packaging.
Return procedure for 1N4730ATR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4730ATR 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…
