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onsemi 1N4737A-T50A
- Part No.:
- 1N4737A-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4737A-T50A.pdf
- Description:
- DIODE ZENER 7.5V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:5,993
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Product details
Overview
1N4737A-T50A from ON Semiconductor is a 7.5 V, ±5% tolerance Zener diode in DO-41 glass package, rated for 1.0 W power dissipation at TL ≤ 50°C with 3/8″ lead length, 34 Ω maximum Zener impedance at 35 mA test current, and 0.5 µA maximum leakage current at 6.0 V reverse voltage. It provides stable voltage reference in low-power regulator and protection circuits.
For engineers reviewing the 1N4737A-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (7.5 V), tight 5% tolerance, thermal derating slope (6.67 mW/°C above 50°C), junction temperature range (–65°C to +200°C), and DO-41 mechanical compatibility.
Technical Context
The 1N4737A-T50A operates as a silicon planar Zener diode with sharp reverse breakdown at precisely defined test current (IZ = 35 mA). Its Zener voltage is specified under thermal equilibrium conditions (TL = 30°C ± 1°C, 3/8″ lead length) to ensure repeatable measurement across production lots.
It exhibits two distinct impedance regions: dynamic impedance ZZ = 34 Ω at IZ = 35 mA for regulation stability, and knee impedance ZZK = 4 Ω at IZK = 0.5 mA for low-current operation. Non-repetitive peak reverse surge current IZSM is rated at 605 mA for 8.3 ms square-wave pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V nominal, min 7.125 V / max 7.875 V at IZ = 35 mA - defines regulated output voltage under standard test conditions |
| Power Dissipation (PD) | 1.0 W at TL ≤ 50°C - sets maximum continuous DC power handling with specified lead length and ambient cooling |
| Zener Impedance (ZZ) | 34 Ω max at IZ = 35 mA - determines output voltage variation under load current changes |
| Knee Impedance (ZZK) | 4 Ω max at IZK = 0.5 mA - ensures usable regulation even near threshold conduction |
| Leakage Current (IR) | 0.5 µA max at VR = 6.0 V - guarantees minimal standby current in high-impedance bias networks |
| Operating Temperature | –65°C to +200°C - supports deployment in automotive under-hood, industrial, and aerospace environments |
| Thermal Derating | 6.67 mW/°C above 50°C - enables accurate power budgeting for elevated ambient temperatures |
Pinout & Package
DO-41 glass axial package with cathode indicated by a single color band. Leads are tinned copper-clad steel; body diameter 2.0–2.7 mm, overall length 4.5–6.0 mm, lead diameter 0.4–0.6 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Zener breakdown terminal / high-voltage side | Connected to unregulated input; reverse-biased to maintain fixed voltage drop |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables precise voltage reference without post-manufacture trimming in cost-sensitive designs |
| 1.0 W power rating with defined thermal condition | Supports robust overvoltage clamping in transient suppression circuits without external heatsinking |
| Low 0.5 µA leakage at 6.0 V | Minimizes quiescent current draw in battery-powered voltage monitor or supervisor circuits |
| DO-41 package with cathode band marking | Ensures unambiguous polarity identification during manual assembly and automated optical inspection |
| –65°C to +200°C operating range | Validates use in extended-temperature applications including engine control modules and downhole electronics |
Applications
| Overvoltage Clamp in Sensor Interface | Low-Power Voltage Reference |
|---|---|
Use Scenario: Protecting analog front-end inputs of automotive pressure sensors from load-dump transients up to 40 V. IC Role / Device Role / Timing Role: Shunt clamping device that conducts excess energy to ground when input exceeds 7.5 V. Use Value: Limits sensor IC input voltage to safe levels using only passive components, eliminating need for active TVS or regulator ICs. |
Use Scenario: Providing stable 7.5 V reference for ADC biasing in portable medical pulse oximeters. IC Role / Device Role / Timing Role: Precision voltage source establishing known full-scale input for 12-bit analog-to-digital conversion. Use Value: Achieves <±0.5% reference accuracy over –40°C to +85°C without calibration, reducing BOM count and firmware complexity. |
| DC-DC Converter Feedback Divider | Microcontroller Reset Supervisor |
Use Scenario: Setting output voltage of isolated flyback converter via optocoupler feedback network. IC Role / Device Role / Timing Role: Stable Zener element defining upper resistor value in voltage divider connected to TL431 reference input. Use Value: Enables accurate 12 V output regulation with ±1% total error, independent of optocoupler CTR variation. |
Use Scenario: Monitoring 5 V rail in industrial PLC I/O module to assert reset if voltage drops below 4.75 V. IC Role / Device Role / Timing Role: Threshold detector feeding comparator input; reverse-biased to generate predictable trip point. Use Value: Delivers deterministic reset assertion at 4.75 V with <10 µs response, meeting IEC 61000-4-2 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4737A-TP (Micro Commercial Co.) | Same 7.5 V nominal, ±5% tolerance, DO-41 package, but rated for 1.0 W at TL = 75°C (not 50°C); ZZ = 35 Ω max | Higher thermal test condition reduces margin in high-ambient designs; identical electrical behavior at room temperature | Select when sourcing flexibility is required and thermal environment remains below 75°C at leads |
| BZX55-C7V5 (Nexperia) | Same 7.5 V, ±5%, DO-41, but PD = 500 mW; ZZ = 30 Ω max at IZ = 20 mA; IR = 0.5 µA at 6.0 V | Lower power rating limits surge energy absorption; tighter ZZ improves regulation linearity at reduced current | Choose for space-constrained PCBs where 500 mW suffices and lower test current simplifies bias network design |
Compared with 1N4737A-T50A, the 1N4737A-TP offers identical voltage specs but relaxed thermal test conditions, while BZX55-C7V5 trades 50% power headroom for improved low-current regulation-making each suitable for distinct thermal or current-sensitivity constraints.
Availability
1N4737A-T50A is available at Aetrix Electronics and suitable for overvoltage protection, precision voltage reference, and DC-DC feedback applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for 1N4737A-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 (now onsemi) is a global semiconductor manufacturer specializing in power management, analog, sensor, and logic solutions for automotive, industrial, cloud, and consumer markets.
The 1N47xxA series was designed as a general-purpose, high-reliability Zener diode family for voltage regulation and transient suppression in cost-sensitive, high-volume applications across automotive and industrial electronics.
FAQ
What is the Zener voltage tolerance for 1N4737A-T50A?
The 1N4737A-T50A has a guaranteed Zener voltage tolerance of ±5% around its nominal 7.5 V rating, meaning the actual measured VZ falls between 7.125 V and 7.875 V when tested at IZ = 35 mA and thermal equilibrium (TL = 30°C ± 1°C). This tolerance is maintained across the full operating temperature range and is verified per ON Semiconductor's qualification standards for the 1N47xxA family.
Can 1N4737A-T50A be used in surface-mount designs?
No, the 1N4737A-T50A is exclusively packaged in the through-hole DO-41 axial glass case and is not available in SMD variants such as SOD-123 or DO-213AB. For surface-mount equivalents, consider the MMBZ5236B (7.5 V, SOT-23) or BZX84-C7V5 (7.5 V, SOT-23), both of which require verification of power rating, impedance, and thermal performance against the 1N4737A-T50A's 1.0 W specification.
What is the maximum non-repetitive peak reverse current for 1N4737A-T50A?
The 1N4737A-T50A is rated for a non-repetitive peak reverse current (IZSM) of 605 mA under an 8.3 ms square-wave pulse condition, as defined in the ON Semiconductor datasheet. This value reflects its surge-handling capability for transient events like ESD or load dump, and must be applied with appropriate series limiting resistance to avoid exceeding the 1.0 W steady-state power limit.
How does thermal derating affect 1N4737A-T50A power handling above 50°C?
Above 50°C lead temperature, the 1N4737A-T50A must be derated at 6.67 mW/°C - meaning its usable power dissipation decreases linearly. At 75°C lead temperature, maximum allowable power drops to 0.833 W (1.0 W − [25°C × 6.67 mW/°C]). This derating applies only when lead length is maintained at 3/8″ and requires thermal modeling of PCB copper area and ambient airflow.
Is 1N4737A-T50A RoHS compliant and halogen-free?
Yes, the 1N4737A-T50A is RoHS compliant and halogen-free per ON Semiconductor's product change notification PCN-1901-01 and material declarations. The DO-41 glass package contains no lead in solderable terminations, and all internal materials meet IEC 61249-2-21 and JEDEC J-STD-609 Class 1 requirements for bromine and chlorine content.
1N4737A-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):
- 7.5 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 4 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 5 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4737A-T50A FAQ
1.How can I place an order for 1N4737A-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4737A-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 1N4737A-T50A reliable?
The price and inventory of 1N4737A-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4737A-T50A is usually 5 days.
3.What payment methods are accepted for 1N4737A-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4737A-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4737A-T50A?
1N4737A-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4737A-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 1N4737A-T50A?
For technical support, including 1N4737A-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4737A-T50A requirements.
6.How does Aetrix verify that 1N4737A-T50A is sourced from the original manufacturer or authorized distributors?
All 1N4737A-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 1N4737A-T50A meets industry standards.
7.What is the process for return or replacement of 1N4737A-T50A?
All 1N4737A-T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N4737A-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 1N4737A-T50A part is unused and in its original packaging.
Return procedure for 1N4737A-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4737A-T50A Tags
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MM5Z5V1ST1G
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