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Nexperia USA Inc. 1N4738A,133
- Part No.:
- 1N4738A,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4738A,133.pdf
- Description:
- DIODE ZENER 8.2V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:2,773
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Product details
Overview
1N4738A,133 from Nexperia is a hermetically sealed 8.2 V ±5 % Zener voltage regulator diode in SOD66 (DO-41) glass package, rated for 1000 mW total power dissipation and 6 mA working current at 8.2 V, used for precision low-voltage stabilization in power supply reference and feedback circuits.
For engineers reviewing the 1N4738A,133 datasheet, 1N4738A,133 pinout, 1N4738A,133 application, or 1N4738A,133 equivalent, this page delivers verified Zener parameters, cathode/anode terminal mapping, thermal resistance (110 K/W), differential resistance (4.5 Ω), and real-world use cases in linear regulator references and overvoltage protection.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable DC voltage under varying load and temperature conditions. It exhibits 4.5 Ω dynamic impedance at 6 mA test current and supports up to 500 mA forward surge current with 1.2 V forward voltage at 200 mA.
Designed for thermal equilibrium operation in still air at 25 °C, it features a junction-to-tie-point thermal resistance of 110 K/W (lead length 4 mm) and operates across −65 °C to +200 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2 V nominal, ±5 % tolerance - defines precise regulation point for feedback networks |
| Test Current (Itest) | 6 mA - operating point where VZ and dynamic impedance are specified |
| Differential Resistance (rdif) | 4.5 Ω - low impedance ensures minimal output voltage shift under load variation |
| Total Power Dissipation (Ptot) | 1000 mW - maximum steady-state power handling at Tamb = 50 °C |
| Forward Voltage (VF) | 1.2 V at IF = 200 mA - relevant for reverse-polarity protection or clamp configurations |
| Junction Temperature Range | −65 °C to +200 °C - enables use in industrial and automotive under-hood environments |
Pinout & Package
Hermetically sealed axial-leaded SOD66 (DO-41) glass package with 2 terminals; marking band denotes cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (banded end) | Cathode | Connected to regulated output node in shunt configuration; accepts reverse bias for Zener conduction |
| 2 (unbanded end) | Anode | Connected to ground or lower potential reference; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass sealing | Prevents moisture ingress and long-term parameter drift in humid or harsh environments |
| ±5 % Zener voltage tolerance | Enables tight regulation without post-production trimming in cost-sensitive designs |
| Low differential resistance (4.5 Ω) | Minimizes output voltage deviation across 1–10 mA load current changes in reference circuits |
| 1000 mW power rating | Supports direct use in low-power shunt regulators without external heat sinking |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in adjustable linear regulators (e.g., LM317-based supplies). IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 8.2 V reference to error amplifier input. Use Value: Enables accurate output setpoint with <±1 % variation over 0–50 °C ambient due to low rdif and stable VZ. |
Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events. IC Role / Device Role / Timing Role: Passive clamping device limiting voltage to 8.2 V during ESD or inductive kickback. Use Value: Responds within nanoseconds to clamp spikes up to 500 mA peak current without latch-up or degradation. |
| Current Source Bias | Signal Level Shifting |
Use Scenario: Generating stable bias current for op-amp input stages or transistor amplifiers. IC Role / Device Role / Timing Role: Constant-current sink using series resistor and 8.2 V Zener drop. Use Value: Delivers 0.5–2 mA bias current with <2 % drift over temperature via matched rdif and thermal stability. |
Use Scenario: Translating 12 V logic signals to 8.2 V compatible levels for mixed-voltage interface. IC Role / Device Role / Timing Role: Passive level translator clamping high-side signal to VZ while sinking excess current. Use Value: Maintains clean 8.2 V high-level threshold with sub-10 ns response and no active components or delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55-C8V2 (Vishay) | Same 8.2 V ±5 %, but rated for 500 mW Ptot and higher rdif (10 Ω) | Limited to lower-power reference roles; unsuitable for >3 mA regulation loads | Select when board space allows larger DO-35 or when lower cost outweighs power headroom |
| 1N4738A (ON Semiconductor) | Identical VZ, Itest, and rdif; same SOD66 package but different lead finish and traceability | Drop-in replacement with identical electrical behavior and thermal performance | Choose for multi-source procurement or legacy BOM continuity where Nexperia is unavailable |
Compared with BZX55-C8V2 and ON Semiconductor's 1N4738A, the Nexperia 1N4738A,133 offers superior power margin (1000 mW vs. 500 mW) and tighter dynamic impedance (4.5 Ω vs. 10 Ω), making it preferred for higher-load reference and clamp applications requiring long-term stability.
Availability
1N4738A,133 is available at Aetrix Electronics and suitable for power supply reference design, overvoltage protection circuits, analog bias generation, and signal level translation requiring stable component supply and consistent Zener characteristics across production batches.
Supply support for 1N4738A,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-grade Zener diodes and robust manufacturing in ISO/TS 16949-certified facilities.
The 1N47xxA series was engineered specifically for industrial and consumer power management applications demanding stable voltage references, low-cost shunt regulation, and long-term parametric consistency in compact glass packages.
FAQ
What is the maximum continuous reverse current the 1N4738A,133 can sustain at 8.2 V?
The 1N4738A,133 is rated for 6 mA working current (IZ) at its nominal Zener voltage of 8.2 V. Sustained operation above this value requires derating per thermal limits: at 50 °C ambient, maximum continuous power is 1000 mW, so IZ must remain ≤121 mA (1000 mW ÷ 8.2 V) to avoid exceeding Ptot. Real-world designs typically limit to ≤20 mA for reliability.
Can the 1N4738A,133 be used in forward-biased mode as a standard rectifier diode?
No - the 1N4738A,133 is optimized for reverse-bias Zener operation and not characterized for forward rectification. Its forward voltage is 1.2 V at 200 mA, significantly higher than Schottky or standard silicon rectifiers (typically 0.7–0.9 V), and its surge current rating (500 mA) applies only to non-repetitive pulses, not continuous forward conduction.
How does the 110 K/W thermal resistance affect PCB layout for reliable operation?
A thermal resistance of 110 K/W means each watt dissipated raises junction temperature by 110 K above tie-point temperature. To keep Tj ≤150 °C at 50 °C ambient, maximum power must be limited to (150 − 50) ÷ 110 ≈ 0.91 W - matching the 1000 mW rating. Layout must ensure ≥4 mm straight lead length and avoid thermal isolation; copper pour under leads improves heat transfer.
Is the 1N4738A,133 compliant with RoHS and REACH regulations?
Yes - the 1N4738A,133 is manufactured by Nexperia in compliance with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Lead finish is matte tin (Sn), and the hermetic glass package contains no restricted substances above threshold limits. Full compliance documentation is available via Nexperia's product portal.
1N4738A,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):
- 8.2 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 4.5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 6 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
1N4738A,133 FAQ
1.How can I place an order for 1N4738A,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4738A,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 1N4738A,133 reliable?
The price and inventory of 1N4738A,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4738A,133 is usually 5 days.
3.What payment methods are accepted for 1N4738A,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4738A,133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4738A,133?
1N4738A,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4738A,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 1N4738A,133?
For technical support, including 1N4738A,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4738A,133 requirements.
6.How does Aetrix verify that 1N4738A,133 is sourced from the original manufacturer or authorized distributors?
All 1N4738A,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 1N4738A,133 meets industry standards.
7.What is the process for return or replacement of 1N4738A,133?
All 1N4738A,133 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4738A,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 1N4738A,133 part is unused and in its original packaging.
Return procedure for 1N4738A,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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