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onsemi 1N4758A-T50A
- Part No.:
- 1N4758A-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4758A-T50A.pdf
- Description:
- DIODE ZENER 56V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:7,156
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Product details
Overview
1N4758A-T50A from ON Semiconductor is a 56 V, 1.0 W Zener diode in DO-41 glass package with ±5% tolerance, 4.5 mA test current, 110 Ω dynamic impedance at IZ, and 0.25 µA leakage current at 42.6 V reverse voltage. It regulates voltage in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4758A-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, thermal derating (6.67 mW/°C above 50°C), peak reverse surge capability (80 mA non-repetitive), and DO-41 mechanical compatibility with through-hole PCB layouts.
Technical Context
This device operates as a precision voltage reference using avalanche breakdown in silicon PN junction. Its 56 V nominal Zener voltage is specified at 4.5 mA test current with 110 Ω impedance at that point and 2000 Ω impedance near knee (IZK = 0.25 mA).
It supports operation across -65°C to +200°C junction temperature range, with power dissipation derated linearly above 50°C ambient (6.67 mW/°C) and rated for 80 mA non-repetitive peak reverse surge per 8.3 ms square wave pulse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V nominal, min 53.2 V / max 58.8 V at 4.5 mA - defines stable regulation point under standard test conditions |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C, 3/8″ lead length - sets maximum continuous DC power handling before thermal shutdown risk |
| Zener Impedance (ZZ) | 110 Ω @ IZ = 4.5 mA - indicates voltage stability under load variation; lower values improve regulation fidelity |
| Leakage Current (IR) | 0.25 µA @ VR = 42.6 V - ensures minimal standby current in high-impedance bias networks |
| Peak Reverse Surge (IZSM) | 80 mA (non-repetitive, 8.3 ms) - enables transient overvoltage clamping without failure in surge-prone inputs |
| Operating Temp Range | -65°C to +200°C - supports deployment in automotive engine compartments and industrial motor controls |
Pinout & Package
DO-41 glass axial package with cathode indicated by a single black band. Two-terminal device: anode (unmarked end) and cathode (banded end). No internal connections beyond the PN junction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | PN junction P-side terminal | Connected to lower-potential side in reverse-biased regulation; carries forward current if forward biased |
| Cathode | PN junction N-side terminal | Banded end; connected to higher-potential side during Zener operation; defines polarity for correct biasing |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-manufacture trimming in cost-sensitive power supplies |
| DO-41 glass package | Provides hermetic sealing and thermal stability for long-term reliability in harsh environments |
| 1.0 W power rating | Supports direct regulation of mid-power analog references and feedback nodes without external heat sinking |
| Low leakage (0.25 µA) | Minimizes error in high-resistance voltage divider networks used in precision sensing circuits |
| 80 mA non-repetitive surge rating | Allows integration into input-stage protection without requiring additional TVS devices in many designs |
Applications
| Industrial Power Supply Reference | Automotive ECU Voltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback converter secondary-side regulation. IC Role / Device Role / Timing Role: Zener diode provides fixed reference for optocoupler-based error amplifier feedback loop. Use Value: 56 V rating matches typical auxiliary rail requirements; ±5% tolerance ensures consistent output setpoint across production lots. |
Use Scenario: Protecting microcontroller I/O pins from load-dump transients on 12 V vehicle bus. IC Role / Device Role / Timing Role: Clamps induced surges above 42.6 V to prevent latch-up or gate oxide damage. Use Value: 80 mA non-repetitive surge rating absorbs ISO 7637-2 Pulse 5a energy without degradation. |
| Test Equipment Calibration Reference | LED Driver Open-Circuit Protection |
Use Scenario: Generating stable 56 V reference in benchtop multimeter front-end scaling circuitry. IC Role / Device Role / Timing Role: Serves as primary voltage standard in resistive divider network feeding ADC reference path. Use Value: Low 0.25 µA leakage avoids loading error in high-Z divider arms; DO-41 allows manual socket replacement during recalibration. |
Use Scenario: Detecting LED string open-circuit condition in constant-current driver by monitoring sense node voltage. IC Role / Device Role / Timing Role: Zener clamps sense line to 56 V when LED string fails open, triggering fault comparator. Use Value: Sharp knee at 4.5 mA enables reliable detection margin above normal operating voltage while avoiding false triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4758A-TP (Micro Commercial Co.) | Same 56 V nominal Zener voltage, ±5% tolerance, DO-41 package, but 1.5 W power rating and 95 Ω ZZ @ 4.5 mA | Higher power handling supports longer surge events; tighter ZZ improves regulation under dynamic loads | Select when extended thermal margin or improved load regulation is required; verify board-level heat dissipation |
| BZX85C56 (Nexperia) | 56 V Zener, ±5%, DO-41, but 1.3 W rating and 120 Ω ZZ @ 5 mA; leakage 0.5 µA @ 45.6 V | Slightly higher leakage and impedance reduce precision in low-power references; wider availability in high-volume distribution | Prefer for cost-driven consumer electronics where absolute regulation accuracy is secondary to supply chain resilience |
Compared with 1N4758A-T50A, the 1N4758A-TP offers higher power margin and lower impedance for demanding regulation, while BZX85C56 trades minor parameter degradation for broader global stock and shorter lead times in volume procurement.
Availability
1N4758A-T50A is available at Aetrix Electronics and suitable for industrial power supply reference, automotive ECU voltage clamp, and test equipment calibration requiring stable component supply with full traceability and lifecycle management.
Supply support for 1N4758A-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 power management, analog, sensors, and discrete devices for automotive, industrial, and cloud power applications.
The 1N47xxA series was designed as a standardized family of general-purpose Zener diodes targeting cost-effective, reliable voltage regulation in legacy and new-design power systems.
FAQ
What is the Zener voltage tolerance of the 1N4758A-T50A?
The 1N4758A-T50A has a ±5% Zener voltage tolerance, meaning its actual breakdown voltage falls between 53.2 V and 58.8 V when measured at the specified 4.5 mA test current and 25°C junction temperature. This tolerance is guaranteed across the full operating temperature range and is marked on the device body as part of ON Semiconductor's standard 1N47xxA series specification.
Does the 1N4758A-T50A require heatsinking in normal operation?
The 1N4758A-T50A is rated for 1.0 W dissipation only when lead temperature is held at or below 50°C with 3/8″ lead length. At ambient temperatures above 50°C, power must be derated by 6.67 mW/°C. For continuous 1.0 W operation, heatsinking or forced-air cooling is recommended - especially in enclosed enclosures - to maintain safe junction temperature within the -65°C to +200°C limit.
Can the 1N4758A-T50A be used as a substitute for the 1N4758A without design changes?
Yes - the 1N4758A-T50A is a direct variant of the base 1N4758A, sharing identical electrical specifications, DO-41 package dimensions, pinout, and marking convention. The "-T50A" suffix denotes tape-and-reel packaging per EIA-481 standard and does not affect electrical performance or mechanical fit.
What is the maximum non-repetitive peak reverse current for the 1N4758A-T50A?
The 1N4758A-T50A supports a non-repetitive peak reverse current (IZSM) of 80 mA, defined for an 8.3 ms square-wave pulse. This rating enables the device to absorb transient overvoltages such as load dump or inductive switching spikes without permanent degradation, provided the average power remains within the 1.0 W DC limit.
How is cathode identification implemented on the 1N4758A-T50A?
The cathode of the 1N4758A-T50A is identified by a single black band located near one end of the DO-41 glass body. This band marks the N-side of the PN junction and must be connected to the higher-potential node in Zener regulation mode. The unmarked end is the anode. This marking follows JEDEC standard DO-41 conventions and is verified in ON Semiconductor's top-mark information documentation.
1N4758A-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):
- 56 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 110 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 42.6 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4758A-T50A FAQ
1.How can I place an order for 1N4758A-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4758A-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 1N4758A-T50A reliable?
The price and inventory of 1N4758A-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4758A-T50A is usually 5 days.
3.What payment methods are accepted for 1N4758A-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4758A-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4758A-T50A?
1N4758A-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4758A-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 1N4758A-T50A?
For technical support, including 1N4758A-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4758A-T50A requirements.
6.How does Aetrix verify that 1N4758A-T50A is sourced from the original manufacturer or authorized distributors?
All 1N4758A-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 1N4758A-T50A meets industry standards.
7.What is the process for return or replacement of 1N4758A-T50A?
All 1N4758A-T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N4758A-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 1N4758A-T50A part is unused and in its original packaging.
Return procedure for 1N4758A-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4758A-T50A Tags
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MMBZ5240B-7-F
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
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Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
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