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Nexperia USA Inc. 1N4737A,133
- Part No.:
- 1N4737A,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4737A,133.pdf
- Description:
- DIODE ZENER 7.5V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:992
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Product details
Overview
1N4737A,133 from Nexperia is a 7.5 V ±5 % Zener voltage regulator diode in a hermetically sealed SOD66 (DO-41) glass package, rated for 1000 mW total power dissipation and 500 mA maximum forward current, used for low-voltage stabilization in linear power supplies and reference circuits.
For engineers reviewing the 1N4737A,133 datasheet, 1N4737A,133 pinout, 1N4737A,133 application, or 1N4737A,133 equivalent, this page delivers verified Zener parameters, cathode/anode terminal mapping, thermal resistance (110 K/W), differential resistance (4 Ω at test current), and real-world use cases in voltage reference and overvoltage protection designs.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 7.5 V reference across load variations, with a specified test current of 34 mA and differential resistance of 4 Ω - enabling tight regulation in low-noise analog references. Its 1000 mW power rating supports operation up to 133 mA at full Zener voltage under ambient conditions.
The device features a 110 K/W junction-to-tie-point thermal resistance (lead length 4 mm), defined per IEC 60134 limiting values, and operates across −65 °C to +200 °C junction temperature range - suitable for industrial environments where thermal stability is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V nominal, ±5 % tolerance - ensures predictable clamping level in reference and protection circuits |
| Test Current (Itest) | 34 mA - defines operating point where VZ and dynamic resistance are guaranteed |
| Differential Resistance (rdif) | 4 Ω at Itest - determines output impedance and load regulation sensitivity |
| Total Power Dissipation (Ptot) | 1000 mW max - sets absolute upper limit for continuous DC or pulsed power handling |
| Forward Voltage (VF) | 1.2 V at 200 mA - relevant for polarity-checking and series-switch applications |
| Junction Temperature Range | −65 °C to +200 °C - enables deployment in extended-temperature industrial and automotive under-hood subsystems |
Pinout & Package
Hermetically sealed axial-leaded SOD66 (DO-41) glass package with 2 leads; cathode identified by a single black band on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (banded end) | Cathode | Connected to regulated output node in shunt configuration; reverse-biased during regulation |
| 2 (non-banded end) | Anode | Connected to ground or common reference; completes current path during Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage tolerance | ±5 % - reduces need for post-regulation trimming in precision reference designs |
| Low differential resistance | 4 Ω - minimizes output voltage shift under varying load currents |
| High junction temperature capability | +200 °C max - supports reliable operation in thermally constrained enclosures |
| Hermetic glass sealing | SOD66 package - prevents moisture ingress and long-term parameter drift in humid environments |
Applications
| Linear Power Supply Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing unregulated DC output in discrete linear regulators using pass transistors. IC Role / Device Role / Timing Role: Shunt voltage reference providing feedback setpoint for error amplifier control loop. Use Value: Delivers 7.5 V reference with 4 Ω dynamic impedance, reducing output ripple sensitivity to load transients. |
Use Scenario: Protecting microcontroller I/O pins from transient voltage spikes exceeding 7.5 V. IC Role / Device Role / Timing Role: Reverse-biased clamping element diverting excess energy to ground before damage occurs. Use Value: Activates at precisely 7.5 V ±5 %, limiting peak voltage without requiring external bias or timing components. |
| Temperature-Stable Sensor Bias | Analog Front-End Calibration Reference |
Use Scenario: Providing excitation voltage to resistive temperature sensors (RTDs) in industrial monitoring systems. IC Role / Device Role / Timing Role: Low-drift DC bias source maintaining constant sensor current despite supply variation. Use Value: Maintains regulation across −65 °C to +200 °C, minimizing temperature-induced measurement offset. |
Use Scenario: Serving as calibration reference for 12-bit ADC input stages in data acquisition modules. IC Role / Device Role / Timing Role: Precision shunt reference establishing known full-scale input voltage. Use Value: Enables <0.1 % full-scale error correction with 4 Ω rdif ensuring minimal loading effect on divider networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4737A (ON Semiconductor) | Same 7.5 V nominal, ±5 %, 1000 mW rating; identical SOD66 package and pinout | No functional difference - direct second-source replacement | Select when dual-sourcing or inventory diversification is required |
| BZX55-C7V5 (Vishay) | 7.5 V ±5 %, but rated at 500 mW Ptot; higher differential resistance (≥10 Ω) | Not suitable for >66 mA continuous Zener current or low-impedance reference use | Choose only for low-power, cost-sensitive applications where thermal margin is ample |
Compared with ON Semiconductor's 1N4737A, the Nexperia part offers identical electrical specs and mechanical compatibility, while the Vishay BZX55-C7V5 trades power handling and dynamic impedance for lower cost - making it viable only in derated, non-critical reference roles.
Availability
1N4737A,133 is available at Aetrix Electronics and suitable for linear power supplies, overvoltage protection circuits, and analog sensor biasing requiring stable component supply and long-term parametric consistency.
Supply support for 1N4737A,133 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified and industrial-grade components.
The 1N47xxA series belongs to Nexperia's Zener regulator diode product line, engineered for robust voltage reference and clamping in cost-sensitive, thermally demanding applications across industrial and consumer power systems.
FAQ
What is the maximum continuous Zener current for 1N4737A,133 at 25 °C ambient?
At 25 °C ambient and with adequate heatsinking, the maximum continuous Zener current is calculated as Ptot/VZ = 1000 mW / 7.5 V ≈ 133 mA. However, the datasheet specifies a working current (IZ) of 5 mA minimum and 133 mA maximum - confirming 133 mA as the upper operational limit under ideal thermal conditions.
How does the 110 K/W thermal resistance affect PCB layout?
The 110 K/W junction-to-tie-point thermal resistance assumes 4 mm lead length and no PCB copper pour. To maintain Tj ≤ 150 °C at full 1000 mW, ambient must stay below 20 °C unless additional copper area or thermal vias are added - layout should minimize lead length and maximize copper thermal mass near both terminals.
Can 1N4737A,133 be used in series for higher voltage references?
Yes - multiple 1N4737A,133 diodes may be stacked anode-to-cathode to achieve integer multiples of 7.5 V (e.g., two in series yield ~15 V). However, mismatched Zener voltages and differential resistances will reduce overall regulation accuracy and require individual current balancing resistors.
Is the 1N4737A,133 RoHS compliant and halogen-free?
Yes - Nexperia confirms the 1N4737A,133 meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21, with material declarations available through Nexperia's compliance portal and standard packaging markings.
1N4737A,133 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- 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:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4737A,133 FAQ
1.How can I place an order for 1N4737A,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4737A,133 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,133 reliable?
The price and inventory of 1N4737A,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4737A,133 is usually 5 days.
3.What payment methods are accepted for 1N4737A,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4737A,133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4737A,133?
1N4737A,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4737A,133 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,133?
For technical support, including 1N4737A,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4737A,133 requirements.
6.How does Aetrix verify that 1N4737A,133 is sourced from the original manufacturer or authorized distributors?
All 1N4737A,133 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,133 meets industry standards.
7.What is the process for return or replacement of 1N4737A,133?
All 1N4737A,133 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4737A,133, 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,133 part is unused and in its original packaging.
Return procedure for 1N4737A,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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