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onsemi 1N4732A_T50R
- Part No.:
- 1N4732A_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4732A_T50R.pdf
- Description:
- DIODE ZENER 4.7V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:6,465
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Product details
Overview
1N4732A_T50R from ON Semiconductor is a 4.7 V ±5% Zener diode in DO-41 glass package, rated for 1.0 W power dissipation at TL ≤ 50°C, with 53 Ω maximum Zener impedance at 8 mA test current and 1 μA leakage current at 3.76 V reverse voltage. It provides stable voltage reference in low-power regulator and protection circuits.
For engineers reviewing the 1N4732A_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (4.7 V), tolerance (±5%), thermal derating (6.67 mW/°C above 50°C), junction temperature range (–65 to +200°C), and DO-41 mechanical compatibility.
Technical Context
This discrete Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its cathode-anode terminals. Its 4.7 V nominal Zener voltage is specified at 8 mA test current (IZ), with typical Zener impedance of 53 Ω and knee impedance (ZZK) of 8 Ω at 0.25 mA (IZK).
The device supports non-repetitive peak reverse surge current up to 970 mA (IZSM) under 8.3 ms square-wave conditions and exhibits 1 μA maximum leakage current at VR = 3.76 V - ensuring low standby power loss in precision biasing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.7 V ±5% at IZ = 8 mA - defines nominal regulation point with tight tolerance for stable reference generation |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance (ZZ) | 53 Ω max @ IZ = 8 mA - indicates voltage regulation stiffness under nominal operating current |
| Knee Impedance (ZZK) | 8 Ω max @ IZK = 0.25 mA - reflects low-current regulation capability for light-load bias networks |
| Leakage Current (IR) | 1 μA max @ VR = 3.76 V - ensures minimal reverse-bias current in standby or sensing circuits |
| Operating Temp Range | –65°C to +200°C - enables use in automotive under-hood, industrial, and aerospace environments |
| Surge Current (IZSM) | 970 mA (non-repetitive, 8.3 ms) - supports transient overvoltage clamping without failure |
Pinout & Package
DO-41 glass axial package with cathode indicated by a single color band on the body. Anode and cathode terminals are unidirectional; polarity must be observed during PCB placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference ground node | Connected to circuit ground or lower-potential rail; forms reference return path |
| Cathode | Zener voltage output terminal / Reverse breakdown anode-side reference | Provides regulated 4.7 V output relative to anode; marked with color band |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-production trimming in cost-sensitive designs |
| 1.0 W power rating with linear derating | Supports robust operation in ambient temperatures up to 200°C with proper lead length management |
| Low 1 μA leakage at 3.76 V | Minimizes quiescent current draw in battery-powered or ultra-low-power monitoring circuits |
| DO-41 glass package | Offers high reliability, hermetic sealing, and compatibility with standard through-hole assembly processes |
| Non-repetitive 970 mA surge rating | Provides inherent transient overvoltage protection without requiring external TVS components |
Applications
| Power Supply Regulation | Overvoltage Protection |
|---|---|
|
Use Scenario: Low-cost linear voltage regulator stage in AC/DC adapters or DC-DC feedback networks. IC Role / Device Role / Timing Role: Zener reference element providing stable 4.7 V reference for error amplifier input or shunt regulator output. Use Value: Delivers consistent regulation despite input ripple or load variation, leveraging 53 Ω ZZ for <10 mV output deviation at 8 mA. |
Use Scenario: Clamping circuit protecting microcontroller I/O pins from ESD or inductive kickback. IC Role / Device Role / Timing Role: Reverse-biased voltage clamp limiting signal swing to 4.7 V above ground. Use Value: Absorbs 970 mA surge pulses without degradation, preserving downstream logic integrity per IEC 61000-4-2 Level 4. |
| Sensor Biasing | Reference Voltage Source |
|
Use Scenario: Providing excitation voltage to resistive temperature detectors (RTDs) or bridge sensors. IC Role / Device Role / Timing Role: Precision bias source delivering stable 4.7 V to sensor elements with minimal self-heating. Use Value: Maintains <±0.5% drift over –40°C to +125°C due to low thermal coefficient and 1 μA leakage. |
Use Scenario: Generating fixed reference for ADC comparators or analog front-end calibration. IC Role / Device Role / Timing Role: Passive voltage reference node in mixed-signal subsystems requiring no active regulation. Use Value: Enables 12-bit ADC accuracy with <0.2 LSB error contribution from reference drift and noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4732A (ON Semiconductor) | Same electrical specs and DO-41 package; T50R suffix denotes tape-and-reel packaging variant | No functional difference; identical performance in board-level design | Select 1N4732A_T50R for automated SMT-compatible reel feeding; choose bulk 1N4732A for manual prototyping |
| BZX55C4V7 (Vishay) | Same 4.7 V ±5%, DO-35 package (smaller footprint), 500 mW rating, higher ZZ (70 Ω) | Lower power handling and higher impedance limit use in high-current or precision reference roles | Prefer BZX55C4V7 only when space-constrained layouts require DO-35 and 500 mW suffices |
Compared with 1N4732A_T50R, the base 1N4732A offers identical electrical behavior but differs only in packaging format, while BZX55C4V7 trades power rating and impedance for smaller size - making 1N4732A_T50R optimal for 1 W, low-Z, DO-41-requiring designs.
Availability
1N4732A_T50R is available at Aetrix Electronics and suitable for power supply regulation, overvoltage protection, sensor biasing, and reference voltage source applications requiring stable component supply and long-term manufacturability.
Supply support for 1N4732A_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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and consumer markets.
The 1N47xxA series was designed as a general-purpose, high-reliability Zener diode family targeting cost-effective voltage reference and clamping in industrial control, power conversion, and instrumentation systems.
FAQ
What is the Zener voltage tolerance for 1N4732A_T50R?
The 1N4732A_T50R has a Zener voltage tolerance of ±5% at 4.7 V nominal, meaning its actual breakdown voltage falls between 4.465 V and 4.935 V when tested at 8 mA. This tolerance is guaranteed per ON Semiconductor's 1N4728A–1N4758A datasheet Rev. 8, and applies directly to the 1N4732A_T50R variant as a tape-and-reel packaged version of the base 1N4732A device.
Is 1N4732A_T50R compatible with DO-41 footprint designs?
Yes, 1N4732A_T50R uses the standard DO-41 glass axial package with 0.400" (10.16 mm) lead spacing and 0.030" (0.76 mm) lead diameter. Its cathode is marked by a single color band, matching mechanical and soldering requirements of legacy DO-41 layouts - no PCB modification is needed when replacing other DO-41 Zeners like 1N4732A or 1N4733A.
What is the maximum non-repetitive surge current for 1N4732A_T50R?
The 1N4732A_T50R supports a non-repetitive peak reverse current (IZSM) of 970 mA under 8.3 ms square-wave conditions, as specified in the ON Semiconductor 1N4728A–1N4758A datasheet. This surge rating allows the device to absorb transient overvoltages without permanent degradation, making it suitable for clamping in relay drivers or motor control interfaces.
How does thermal derating work for 1N4732A_T50R?
1N4732A_T50R is rated for 1.0 W power dissipation at lead temperature (TL) ≤ 50°C. Above 50°C, power must be linearly derated at 6.67 mW/°C - for example, at TL = 100°C, maximum allowable power drops to 0.667 W. This derating ensures safe junction temperature operation within the –65°C to +200°C range, provided leads are trimmed to 3/8" (9.5 mm) as specified.
Can 1N4732A_T50R replace BZX55C4V7 in existing designs?
1N4732A_T50R can functionally replace BZX55C4V7 in many applications, but requires layout verification: both share 4.7 V ±5% Zener voltage, but 1N4732A_T50R uses DO-41 (larger) vs. DO-35 (smaller) package and delivers 1.0 W vs. 0.5 W power. Use 1N4732A_T50R only if board space permits and higher power/low-impedance performance is needed - otherwise BZX55C4V7 remains valid for compact, low-power roles.
1N4732A_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:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 10 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
1N4732A_T50R FAQ
1.How can I place an order for 1N4732A_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4732A_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 1N4732A_T50R reliable?
The price and inventory of 1N4732A_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4732A_T50R is usually 5 days.
3.What payment methods are accepted for 1N4732A_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4732A_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4732A_T50R?
1N4732A_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4732A_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 1N4732A_T50R?
For technical support, including 1N4732A_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4732A_T50R requirements.
6.How does Aetrix verify that 1N4732A_T50R is sourced from the original manufacturer or authorized distributors?
All 1N4732A_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 1N4732A_T50R meets industry standards.
7.What is the process for return or replacement of 1N4732A_T50R?
All 1N4732A_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N4732A_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 1N4732A_T50R part is unused and in its original packaging.
Return procedure for 1N4732A_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4732A_T50R Tags
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