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onsemi 1N4734A-T50A
- Part No.:
- 1N4734A-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4734A-T50A.pdf
- Description:
- DIODE ZENER 5.6V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:15,271
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Product details
Overview
1N4734A-T50A from ON Semiconductor is a 5.6 V, ±5% tolerance Zener diode in DO-41 glass package, rated for 1.0 W power dissipation at TL ≤ 50°C with 6.67 mW/°C derating, designed for precision voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and analog signal conditioning stages.
For engineers reviewing the 1N4734A-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy (5.1–5.88 V), low dynamic impedance (45 Ω @ 45 mA), leakage current (≤1 μA @ 4.2 V), thermal stability (−65 to +200°C operating range), and DO-41 mechanical compatibility with standard through-hole PCB layouts.
Technical Context
The 1N4734A-T50A operates as a silicon planar Zener diode with sharp reverse breakdown characteristics, optimized for stable DC voltage reference generation under controlled test current (IZ = 45 mA). Its design centers on maintaining tight VZ tolerance and low ZZ across temperature, supported by a junction structure that ensures predictable thermal coefficient behavior.
It exhibits a nominal zener voltage of 5.6 V with min/max bounds of 5.1 V and 5.88 V, measured at 45 mA with 3/8″ lead length at TL = 30°C ±1°C. The device's non-repetitive peak reverse current rating (IZSM = 810 mA) and low leakage (IR ≤ 1 μA at VR = 4.2 V) enable robust transient suppression and low-error biasing in analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.6 V nominal, 5.1–5.88 V range at IZ = 45 mA - defines regulated output voltage with ±5% tolerance for stable reference design |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance (ZZ) | 45 Ω @ IZ = 45 mA - determines regulation stiffness and AC ripple rejection in feedback paths |
| Leakage Current (IR) | ≤1 μA @ VR = 4.2 V - ensures minimal error current in high-impedance reference nodes |
| Operating Temperature | −65°C to +200°C - supports deployment in automotive under-hood, industrial control, and aerospace environments |
| Package | DO-41 glass axial - provides industry-standard through-hole mounting, hermetic reliability, and cathode band polarity marking |
Pinout & Package
DO-41 glass axial package with cathode indicated by a single color band. Two-terminal device: anode and cathode; no internal connections beyond the two leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground node | Connected to circuit ground or lower potential side in reverse-biased regulation configuration |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input voltage source via series resistor; delivers stable 5.6 V to load when reverse biased |
Key Features
| Feature | Design Value |
|---|---|
| Tight Zener voltage tolerance | ±5% (5.1–5.88 V) - enables accurate voltage setting without external trimming in cost-sensitive designs |
| Low dynamic impedance | 45 Ω @ 45 mA - minimizes output voltage variation under load current changes in regulation circuits |
| High surge capability | 810 mA non-repetitive peak reverse current - withstands short-duration transients without degradation |
| Wide temperature operation | −65°C to +200°C - maintains regulation integrity in extreme ambient conditions without derating penalties |
| Standard DO-41 footprint | Compatible with legacy through-hole assembly and automated insertion equipment - reduces manufacturing requalification effort |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Precision voltage reference for TL431-type shunt regulator or primary-side controller feedback network. Use Value: 5.6 V nominal VZ matches common TL431 reference thresholds, enabling direct interface with <1% total error across temperature. |
Use Scenario: Clamping transient spikes on 5 V logic rails or sensor inputs exposed to ESD or inductive kick. IC Role / Device Role / Timing Role: Fast-acting voltage clamp placed between rail and ground, activated above 5.88 V. Use Value: Low ZZ (45 Ω) limits clamping voltage overshoot; 1 μA IR prevents loading of high-Z sensor outputs during normal operation. |
| Industrial Analog Signal Reference | Microcontroller Reset Circuit |
Use Scenario: Providing stable bias voltage for op-amp comparators or ADC reference dividers in PLC analog I/O modules. IC Role / Device Role / Timing Role: Low-drift DC reference source for ratiometric measurement chains requiring <10 ppm/°C drift contribution. Use Value: −65°C to +200°C operating range ensures functionality in unheated enclosures; DO-41 allows manual replacement in field service. |
Use Scenario: Generating clean reset pulse for MCUs powered from 5 V supplies during brown-out or startup. IC Role / Device Role / Timing Role: Zener-based threshold detector feeding RC delay into reset pin of microcontrollers like PIC16F or STM32. Use Value: 5.6 V VZ ensures reliable assertion above typical 4.5 V reset threshold while avoiding false triggers from ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4734A (ON Semiconductor) | No suffix - same electrical specs, identical DO-41 package, but lacks T50A tape-and-reel packaging and traceability markings | Suitable for manual prototyping or low-volume hand-soldered assemblies where reel packaging is unnecessary | Select 1N4734A-T50A for automated SMT-compatible through-hole placement and full lot traceability; choose bare 1N4734A for bench testing. |
| BZX55C5V6 (Vishay) | Same 5.6 V, ±5%, DO-35 package - smaller outline, 500 mW rating, higher ZZ (60 Ω), wider temp range (−65°C to +175°C) | Preferred in space-constrained boards or where lower power dissipation suffices; not drop-in due to DO-35 vs. DO-41 footprint mismatch | Choose BZX55C5V6 only if board layout accommodates DO-35 and thermal margin permits 500 mW operation. |
Compared with 1N4734A-T50A, the bare 1N4734A offers identical performance but no tape-and-reel logistics support, while BZX55C5V6 trades package size and power rating for reduced footprint - neither is pin-compatible, requiring PCB redesign for substitution.
Availability
1N4734A-T50A is available at Aetrix Electronics and suitable for switch-mode power supply feedback, overvoltage protection clamp, and industrial analog signal reference applications requiring stable component supply, consistent parametric performance, and full traceability across production batches.
Supply support for 1N4734A-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, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1N47xxA series was developed specifically for general-purpose Zener regulation in cost-sensitive, high-reliability power and signal conditioning applications - emphasizing tight tolerance, thermal stability, and broad environmental resilience.
FAQ
What is the zener voltage tolerance of the 1N4734A-T50A?
The 1N4734A-T50A has a zener voltage tolerance of ±5%, resulting in a guaranteed VZ range of 5.1 V to 5.88 V when measured at 45 mA test current and 30°C lead temperature. This tolerance is specified per ON Semiconductor's 1N4728A–1N4758A datasheet Rev. 8 and applies directly to the 1N4734A-T50A variant.
Does the 1N4734A-T50A have a specified thermal resistance?
The 1N4734A-T50A does not list junction-to-ambient (RθJA) or junction-to-lead (RθJL) thermal resistance values in its official datasheet. Instead, ON Semiconductor specifies derating: 6.67 mW/°C above 50°C ambient, based on 3/8″ lead length. This implies effective thermal management relies on PCB copper area and lead length rather than discrete Rθ values for the 1N4734A-T50A.
Can the 1N4734A-T50A be used in surface-mount designs?
No - the 1N4734A-T50A is packaged exclusively in the DO-41 axial glass case, which is a through-hole format. It is not compatible with surface-mount assembly processes. For SMT equivalents, consider ON Semiconductor's NZ9F5V6T5G (SOD-923) or similar, but those are distinct part numbers with different electrical and thermal profiles than the 1N4734A-T50A.
What is the maximum non-repetitive peak reverse current for the 1N4734A-T50A?
The 1N4734A-T50A has a maximum non-repetitive peak reverse current (IZSM) of 810 mA, defined for an 8.3 ms square-wave surge per Note 2 in the datasheet. This rating reflects short-duration transient handling capability and must not be exceeded repeatedly, as it exceeds the device's steady-state power limit of 1.0 W.
Is the 1N4734A-T50A RoHS compliant and halogen-free?
Yes - the 1N4734A-T50A is RoHS compliant and halogen-free, as confirmed by ON Semiconductor's official product change notices and material declarations. The "T50A" suffix denotes tape-and-reel packaging meeting J-STD-020 moisture sensitivity level 1 requirements, and all materials meet IPC-1752 reporting standards for the 1N4734A-T50A.
1N4734A-T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 5.6 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 2 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4734A-T50A FAQ
1.How can I place an order for 1N4734A-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4734A-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 1N4734A-T50A reliable?
The price and inventory of 1N4734A-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4734A-T50A is usually 5 days.
3.What payment methods are accepted for 1N4734A-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4734A-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4734A-T50A?
1N4734A-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4734A-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 1N4734A-T50A?
For technical support, including 1N4734A-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4734A-T50A requirements.
6.How does Aetrix verify that 1N4734A-T50A is sourced from the original manufacturer or authorized distributors?
All 1N4734A-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 1N4734A-T50A meets industry standards.
7.What is the process for return or replacement of 1N4734A-T50A?
All 1N4734A-T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N4734A-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 1N4734A-T50A part is unused and in its original packaging.
Return procedure for 1N4734A-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4734A-T50A Tags
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