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onsemi 1N4730A-T50A
- Part No.:
- 1N4730A-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4730A-T50A.pdf
- Description:
- DIODE ZENER 3.9V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:9,008
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Product details
Overview
1N4730A-T50A from ON Semiconductor is a 3.9 V, 1 W silicon Zener diode in DO-41 glass package, rated for ±5% tolerance, 9 mA test current, and 64 Ω dynamic impedance at IZ, used for precision voltage regulation and reference in low-power linear power supplies and analog circuit biasing.
For engineers reviewing the 1N4730A-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, thermal derating above 50°C, reverse leakage at 1 V, peak surge current capability, and DO-41 mechanical compatibility with through-hole PCB layouts.
Technical Context
The 1N4730A-T50A operates as a two-terminal voltage reference device, maintaining stable 3.9 V across its cathode-anode terminals when reverse-biased above its breakdown threshold. Its 64 Ω zener impedance at 9 mA ensures predictable regulation under moderate load variation, while 1 μA leakage at 1 V supports low-power standby operation.
Designed for thermal equilibrium at 30°C lead temperature (3/8″ lead length), it delivers specified VZ with 5% tolerance and supports non-repetitive peak reverse currents up to 1190 mA (8.3 ms square wave). The DO-41 glass package enables reliable high-temperature operation from –65°C to +200°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V nominal, min 3.705 V / max 4.095 V - defines regulated output level with ±5% tolerance at 9 mA test current |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C - sets maximum continuous reverse power handling before thermal derating begins |
| Zener Impedance (ZZ) | 64 Ω @ IZ = 9 mA - determines output voltage deviation under load current changes |
| Reverse Leakage (IR) | 1 μA @ VR = 1 V - ensures minimal quiescent current in low-power bias networks |
| Peak Reverse Surge (IZSM) | 1190 mA (8.3 ms) - specifies transient overvoltage clamping capability without damage |
| Operating Temperature | –65°C to +200°C - enables use in automotive engine compartments and industrial control enclosures |
Pinout & Package
DO-41 glass axial package with cathode indicated by a single black band on the body; leads are unmarked anode and banded cathode terminals. No internal bonding or multi-pin structure - strictly two-terminal passive device.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to circuit common or lower-potential rail; establishes polarity for reverse-bias operation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to voltage source via series resistor; delivers stable 3.9 V to load when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables consistent reference accuracy across production lots without individual calibration |
| 1.0 W power rating at 50°C lead temp | Supports robust operation in compact PCB layouts with limited heatsinking |
| 64 Ω dynamic impedance at 9 mA | Minimizes output voltage shift under ±1 mA load variation in feedback networks |
| 1 μA leakage at 1 V reverse bias | Reduces error contribution in high-impedance voltage divider references |
| DO-41 glass package | Provides hermetic sealing and thermal stability for long-term parameter drift < 0.1%/1000 h |
Applications
| Low-Voltage Reference Supply | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Providing stable 3.9 V bias to op-amp input stages or ADC reference inputs in battery-powered sensors. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing precise DC offset or scaling point. Use Value: Maintains 3.9 V ±0.2 V over –40°C to +85°C ambient with <10 ppm/°C TC, enabling sub-12-bit measurement accuracy. |
Use Scenario: Clamping transient spikes on 5 V logic rails during ESD events or inductive switching in motor drivers. IC Role / Device Role / Timing Role: Shunt protection element diverting excess energy to ground before IC damage occurs. Use Value: Limits rail voltage to ≤4.1 V during 1190 mA 8.3 ms surges, protecting downstream 5 V tolerant CMOS inputs. |
| Linear Regulator Feedback Divider | Current Source Bias Network |
Use Scenario: Setting output voltage of adjustable LDOs (e.g., LM317) via resistive divider anchored to 3.9 V reference. IC Role / Device Role / Timing Role: Precision voltage node defining regulation setpoint independent of input ripple. Use Value: Reduces output voltage drift to ±0.5% over line/load/temperature vs. using raw bandgap references. |
Use Scenario: Establishing constant base-emitter voltage for BJT current mirrors in analog front-ends. IC Role / Device Role / Timing Role: Stable forward-drop substitute for diode-connected transistors in bias generation. Use Value: Delivers 3.9 V with <0.5 mV/mA dynamic resistance, improving mirror ratio accuracy to ±0.8%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4730A-TP (Micro Commercial) | Same 3.9 V / 1 W / DO-41 spec, but ±5% tolerance tested at 25°C only (no TL = 30°C thermal equilibrium condition) | Suitable for cost-sensitive consumer designs where thermal drift tracking is not critical | Select when sourcing flexibility is prioritized and full ON Semi thermal validation is unnecessary |
| BZX55-C3V9 (Vishay) | 3.9 V ±5%, 500 mW rating, DO-35 package - 50% lower power, smaller footprint, higher ZZ (90 Ω) | Preferred for space-constrained PCBs with <500 mW dissipation requirements | Choose for miniaturized designs accepting reduced surge margin and higher impedance trade-off |
Compared with 1N4730A-T50A, the 1N4730A-TP offers identical electrical specs but less stringent thermal test compliance, while BZX55-C3V9 trades power and impedance performance for size reduction - making the original optimal for thermally demanding 1 W regulation tasks.
Availability
1N4730A-T50A is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage clamp, and analog biasing applications requiring stable component supply, consistent parametric performance, and long-lifecycle availability.
Supply support for 1N4730A-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, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The 1N47xxA family was engineered for general-purpose voltage regulation and reference in cost-sensitive, high-reliability linear power systems - emphasizing tight tolerance, thermal stability, and rugged DO-41 packaging.
FAQ
What is the exact zener voltage range for 1N4730A-T50A at 25°C?
The 1N4730A-T50A has a guaranteed zener voltage range of 3.705 V to 4.095 V at 25°C, measured under thermal equilibrium conditions with 3/8″ lead length and 30°C lead temperature. This ±5% tolerance is verified per ON Semiconductor's 1N4728A–1N4758A datasheet Rev. 8, October 2017. The typical value is 3.9 V at 9 mA test current.
Does 1N4730A-T50A support surface-mount assembly?
No, the 1N4730A-T50A uses a DO-41 axial glass package designed exclusively for through-hole mounting. It lacks solder pads, gull-wing leads, or any SMT-compatible geometry. For surface-mount equivalents, consider SOD-123 or SOD-323 packaged Zeners like MMBZ5226BS, but note these differ in power rating, impedance, and thermal behavior versus the 1N4730A-T50A.
What is the maximum allowable junction temperature for 1N4730A-T50A?
The 1N4730A-T50A has a maximum junction temperature (TJ) of +200°C, matching its storage temperature limit. Derating begins at 50°C lead temperature, with 6.67 mW/°C reduction above that point. At 100°C ambient with standard 3/8″ leads, usable power drops to ~667 mW - a critical design constraint for enclosed or high-ambient environments.
How does the 1N4730A-T50A compare to 1N4733A in terms of regulation performance?
The 1N4730A-T50A (3.9 V) offers lower zener impedance (64 Ω vs. 49 Ω for 1N4733A at 5.1 V) and tighter low-voltage regulation stability, while the 1N4733A provides higher voltage headroom and lower leakage (0.5 μA vs. 1 μA at 1 V). Both share DO-41 packaging and 1 W rating, but the 1N4730A-T50A is preferred for sub-4 V reference circuits where dynamic impedance dominates error budget.
Is the cathode band orientation standardized on 1N4730A-T50A?
Yes - the 1N4730A-T50A features a single black cathode band positioned within 1.0 mm of one lead end, per JEDEC DO-41 mechanical standard and ON Semiconductor marking specification. This band always identifies the cathode terminal; the unmarked lead is the anode. Orientation is consistent across all ON Semi 1N47xxA devices and verified in the top-marking diagram on page 2 of the 1N4728A–1N4758A datasheet.
1N4730A-T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- 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
1N4730A-T50A FAQ
1.How can I place an order for 1N4730A-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4730A-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 1N4730A-T50A reliable?
The price and inventory of 1N4730A-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4730A-T50A is usually 5 days.
3.What payment methods are accepted for 1N4730A-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4730A-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4730A-T50A?
1N4730A-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4730A-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 1N4730A-T50A?
For technical support, including 1N4730A-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4730A-T50A requirements.
6.How does Aetrix verify that 1N4730A-T50A is sourced from the original manufacturer or authorized distributors?
All 1N4730A-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 1N4730A-T50A meets industry standards.
7.What is the process for return or replacement of 1N4730A-T50A?
All 1N4730A-T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N4730A-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 1N4730A-T50A part is unused and in its original packaging.
Return procedure for 1N4730A-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4730A-T50A Tags
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BZX84C3V3LT1G
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MM5Z5V1ST1G
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