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onsemi 1N4737A_T50R
- Part No.:
- 1N4737A_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4737A_T50R.pdf
- Description:
- DIODE ZENER 7.5V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:3,560
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Product details
Overview
1N4737A_T50R from ON Semiconductor is a 7.5 V ±5% Zener diode in DO-41 glass package, rated for 1.0 W power dissipation at TL ≤ 50°C, with typical zener impedance of 34 Ω at 35 mA test current and maximum leakage current of 10 μA at 6.0 V reverse voltage. It serves as a precision voltage reference or overvoltage clamp in low-power linear regulators and analog signal conditioning circuits.
For engineers reviewing the 1N4737A_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include verified 7.5 V nominal zener voltage, DO-41 mechanical compatibility, thermal derating slope (6.67 mW/°C), peak reverse surge capability (605 mA), and guaranteed 5% tolerance under standardized test conditions.
Technical Context
The 1N4737A_T50R operates as a silicon planar Zener diode optimized for stable voltage regulation in DC bias networks. Its breakdown mechanism is predominantly avalanche-dominated above 6 V, enabling low dynamic impedance and predictable knee characteristics at IZ = 35 mA.
It is characterized at lead temperature TL = 30°C ±1°C with 3/8″ lead length, and its thermal performance is defined by junction-to-lead resistance - supporting reliable operation across -65°C to +200°C storage and operating ranges without derating below 50°C.
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 tolerance band for reference design |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C - sets maximum continuous DC power handling before thermal derating begins |
| Zener Impedance (ZZ) | 34 Ω typical @ IZ = 35 mA - determines AC ripple rejection and regulation sensitivity to load current changes |
| Leakage Current (IR) | ≤10 μA @ VR = 6.0 V - ensures minimal error current in high-impedance bias networks |
| Peak Reverse Surge (IZSM) | 605 mA non-repetitive @ 8.3 ms - supports transient overvoltage clamping in protection circuits |
| Operating Temperature | -65°C to +200°C - enables use in automotive under-hood, industrial control, and aerospace environments |
| Tolerance | ±5% - meets standard industrial grade requirement for cost-sensitive voltage reference applications |
Pinout & Package
DO-41 glass axial package with cathode indicated by a single black band. Leads are tinned copper-clad steel; case is hermetically sealed glass with axial symmetry. Standard lead length is 3/8″ for thermal rating compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; carries full load current during regulation |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher-potential node; establishes regulated voltage at cathode relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage | 7.5 V ±5% maintained across -65°C to +150°C operating range - reduces need for external trimming in temperature-varying systems |
| Low dynamic impedance | 34 Ω typical at 35 mA - improves line and load regulation in feedback references and shunt regulators |
| High surge capability | 605 mA non-repetitive peak reverse current - enables robust transient suppression without external series limiting resistors |
| Hermetic glass package | DO-41 with black cathode band - provides long-term reliability and moisture resistance in harsh ambient conditions |
| Standardized test conditions | Characterized at TL = 30°C ±1°C, 3/8″ lead length - ensures consistent parametric validation across manufacturing lots |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 7.5 V reference for microcontroller ADC bias and sensor excitation in BCM subassemblies. IC Role / Device Role / Timing Role: Shunt voltage reference maintaining accuracy despite battery voltage fluctuations (9–16 V). Use Value: Enables <1% reference drift over -40°C to +125°C ambient, meeting AEC-Q101 stress requirements without active compensation. |
Use Scenario: Clamping and regulating supply rails for 4–20 mA transmitter front-end op-amps. IC Role / Device Role / Timing Role: Precision shunt regulator establishing fixed bias point for rail-to-rail input amplifiers. Use Value: Delivers 34 Ω dynamic impedance to suppress 50/60 Hz line noise coupling into analog signal paths. |
| Consumer Power Adapter Feedback | Medical Diagnostic Equipment Reference |
Use Scenario: Secondary-side voltage sensing in isolated flyback converters with optocoupler feedback. IC Role / Device Role / Timing Role: Zener reference setting error amplifier threshold for output voltage regulation. Use Value: Maintains ±5% output tolerance across 10–100% load while surviving 1000× surge events per IEC 61000-4-5. |
Use Scenario: Stable bias generation for photodiode transimpedance amplifiers in portable blood analyzers. IC Role / Device Role / Timing Role: Low-noise voltage reference minimizing dark-current measurement error. Use Value: Limits leakage to ≤10 μA at 6.0 V, reducing baseline offset drift to <0.5 LSB in 16-bit ADC systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C7V5 (Vishay) | Same 7.5 V ±5%, DO-35 package, 500 mW rating, higher ZZ (70 Ω typical) | Lower power handling limits use in >500 mW continuous dissipation scenarios | Select when footprint constraints favor smaller DO-35 or when lower cost outweighs 1.0 W capability |
| 1N5236B (ON Semiconductor) | 7.5 V ±5%, DO-35, 500 mW, tighter ZZ spec (40 Ω max), but narrower temp range (-65°C to +175°C) | Not qualified for extended high-temp operation beyond 175°C junction | Prefer where board space is critical and thermal margin is sufficient below 175°C |
Compared with BZX55C7V5 and 1N5236B, the 1N4737A_T50R offers superior power handling (1.0 W vs. 0.5 W), lower dynamic impedance (34 Ω vs. ≥40 Ω), and broader temperature survivability (+200°C), making it optimal for high-reliability industrial and automotive designs requiring sustained dissipation.
Availability
1N4737A_T50R is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and medical diagnostic equipment requiring stable component supply and long-lifecycle support.
Supply support for 1N4737A_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, sensors, and logic devices for automotive, industrial, and consumer markets.
The 1N47xxA series was designed specifically for general-purpose Zener voltage regulation in cost-sensitive, high-volume applications where stability, reliability, and standardized testing are essential.
FAQ
What is the nominal Zener voltage and tolerance of the 1N4737A_T50R?
The 1N4737A_T50R has a nominal Zener voltage of 7.5 V with a tolerance of ±5%, meaning the actual breakdown voltage falls between 7.125 V and 7.875 V when tested at IZ = 35 mA and TL = 30°C ±1°C. This tolerance is guaranteed across the full operating temperature range and forms the basis for precision reference designs using the 1N4737A_T50R.
What is the maximum power dissipation rating for the 1N4737A_T50R?
The 1N4737A_T50R is rated for 1.0 W power dissipation at lead temperature (TL) ≤ 50°C with 3/8″ lead length. Above 50°C, it must be derated linearly at 6.67 mW/°C. This rating directly governs safe continuous DC operation and must be validated against actual board-level thermal conditions when deploying the 1N4737A_T50R in production systems.
How does the Zener impedance of the 1N4737A_T50R affect voltage regulation performance?
The 1N4737A_T50R exhibits a typical Zener impedance (ZZ) of 34 Ω at IZ = 35 mA, which determines how much the output voltage varies with changes in load current. Lower ZZ yields tighter regulation - for example, a 10 mA load shift causes only ~340 mV deviation. This behavior is critical when using the 1N4737A_T50R in feedback loops or precision bias networks.
What is the peak reverse surge current rating for the 1N4737A_T50R?
The 1N4737A_T50R supports a non-repetitive peak reverse surge current (IZSM) of 605 mA under an 8.3 ms square-wave pulse, as specified in the ON Semiconductor datasheet. This rating validates the 1N4737A_T50R's suitability for transient voltage suppression in power supply inputs and interface protection circuits where short-duration overvoltage events occur.
Is the 1N4737A_T50R compatible with automated PCB assembly processes?
Yes, the 1N4737A_T50R in DO-41 package is compatible with standard wave soldering and reflow-compatible axial lead processes. Its glass body withstands peak temperatures up to 260°C for 10 seconds, and the tinned leads ensure reliable wetting. The 1N4737A_T50R is widely used in high-volume manufacturing where process consistency and long-term solder joint integrity are required.
1N4737A_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):
- 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_T50R FAQ
1.How can I place an order for 1N4737A_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4737A_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 1N4737A_T50R reliable?
The price and inventory of 1N4737A_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4737A_T50R is usually 5 days.
3.What payment methods are accepted for 1N4737A_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4737A_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4737A_T50R?
1N4737A_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4737A_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 1N4737A_T50R?
For technical support, including 1N4737A_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4737A_T50R requirements.
6.How does Aetrix verify that 1N4737A_T50R is sourced from the original manufacturer or authorized distributors?
All 1N4737A_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 1N4737A_T50R meets industry standards.
7.What is the process for return or replacement of 1N4737A_T50R?
All 1N4737A_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N4737A_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 1N4737A_T50R part is unused and in its original packaging.
Return procedure for 1N4737A_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4737A_T50R Tags
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