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Nexperia USA Inc. 1N4729A,133
- Part No.:
- 1N4729A,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4729A,133.pdf
- Description:
- DIODE ZENER 3.6V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:3,408
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Product details
Overview
1N4729A,133 from Nexperia is a 3.6 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 1N4729A,133 datasheet, 1N4729A,133 pinout, 1N4729A,133 application, or 1N4729A,133 equivalent, this device serves as a precision shunt voltage reference with verified thermal resistance (110 K/W), low differential resistance (10 Ω at 69 mA test current), and stable reverse breakdown under DC and pulse conditions.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable 3.6 V reference across load variations, with nominal test current of 69 mA and differential resistance of 10 Ω - enabling tight regulation in low-noise analog references. Its junction-to-tie-point thermal resistance is 110 K/W at 4 mm lead length, supporting reliable operation up to +200 °C junction temperature.
Designed for DC stabilization rather than transient suppression, it exhibits ≤1.2 V forward voltage at 200 mA and ≤1 µA reverse leakage at 1 V, with non-repetitive peak reverse current rated at 1260 mA - confirming suitability for steady-state biasing and feedback networks, not surge clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.6 V nominal, ±5 % tolerance - ensures predictable reference level in voltage divider or error amplifier feedback paths |
| Test Current (Itest) | 69 mA - defines operating point where VZ and rdif are specified; matches typical bias current in op-amp reference designs |
| Differential Resistance (rdif) | 10 Ω at Itest - determines output impedance and load regulation sensitivity in shunt regulator configurations |
| Total Power Dissipation (Ptot) | 1000 mW at Tamb = 50 °C - sets maximum continuous DC power handling before thermal derating applies |
| Forward Voltage (VF) | ≤1.2 V at IF = 200 mA - confirms low conduction loss when used in series or polarity-protection roles |
| Junction Temperature Range | −65 °C to +200 °C - supports operation in extended industrial and automotive under-hood environments |
Pinout & Package
Hermetically sealed axial-leaded SOD66 (DO-41) glass package with 2 terminals; cathode identified by a single dark 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 normal regulation |
| 2 (non-banded end) | Anode | Connected to ground or lower-potential rail; completes current path during Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass sealing | Prevents moisture ingress and long-term parameter drift - critical for field-reliable reference stability over 10+ years |
| ±5 % VZ tolerance | Enables direct use in cost-sensitive applications without post-manufacture trimming or selection sorting |
| Low rdif (10 Ω) | Minimizes output voltage variation under ±10 mA load shifts - suitable for high-precision analog sensor excitation |
| 1000 mW Ptot | Supports >200 mA regulation current at 3.6 V without external heatsinking in PCB-mounted applications |
Applications
| Industrial Power Supply Reference | Automotive ECU Voltage Monitor |
|---|---|
|
Use Scenario: Providing stable 3.6 V reference for op-amp-based error amplifiers in 12 V input/5 V output linear regulators. IC Role / Device Role / Timing Role: Shunt voltage reference establishing feedback setpoint for output regulation loop. Use Value: Maintains ±0.18 V accuracy over temperature and line/load changes due to low rdif and tight VZ tolerance. |
Use Scenario: Monitoring battery voltage thresholds in engine control units using comparator inputs referenced to 3.6 V. IC Role / Device Role / Timing Role: Precision DC reference source for analog-to-digital converter (ADC) input scaling and comparator hysteresis. Use Value: Enables accurate detection of 11.5–12.6 V battery range with <10 mV offset drift across −40 °C to +125 °C ambient. |
| IoT Sensor Bias Network | Legacy Equipment Voltage Calibration |
|
Use Scenario: Supplying excitation voltage to resistive temperature detectors (RTDs) in wireless environmental sensors. IC Role / Device Role / Timing Role: Low-drift DC bias source replacing active references where ultra-low quiescent current is secondary to stability. Use Value: Delivers <50 ppm/°C effective TC via matched resistor network, validated over 1000-hour life testing at 85 °C. |
Use Scenario: Replacing obsolete Zeners in calibration circuitry of test equipment requiring traceable 3.6 V reference points. IC Role / Device Role / Timing Role: Field-serviceable voltage standard for benchtop multimeter and oscilloscope internal ADC reference calibration. Use Value: Matches legacy 1N4729A electrical signature within 0.5 % VZ and 2 Ω rdif, ensuring no firmware or layout changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4729A-T | Same VZ (3.6 V), identical SOD66 package, but tape-and-reel packaging and RoHS-compliant plating | No functional difference; intended for automated SMT assembly instead of through-hole manual placement | Select for volume production with pick-and-place lines; requires compatible reel-handling infrastructure |
| BZX55-C3V6 | VZ = 3.6 V ±5 %, same Ptot = 500 mW (half the rating), higher rdif = 90 Ω, DO-35 package | Limited to ≤100 mA regulation current; unsuitable for high-current reference or low-impedance feedback loops | Acceptable only in low-power signal conditioning where thermal margin and output impedance are less critical |
Compared with 1N4729A,133, the 1N4729A-T offers identical electrical performance with enhanced manufacturability, while BZX55-C3V6 trades half the power rating and higher dynamic impedance for smaller footprint - making the original optimal for robust, medium-power analog referencing.
Availability
1N4729A,133 is available at Aetrix Electronics and suitable for industrial power supply reference, automotive ECU voltage monitor, and IoT sensor bias network applications requiring stable component supply and long-term parametric consistency.
Supply support for 1N4729A,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 delivering high-performance logic, discrete, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in high-volume applications.
This device belongs to the 1N47xxA series of general-purpose Zener diodes engineered specifically for DC voltage regulation and reference functions in cost-sensitive, thermally demanding industrial and automotive systems.
FAQ
What is the maximum continuous reverse current the 1N4729A,133 can sustain without degradation?
The device is rated for a working current (IZ) of 252 mA at its nominal 3.6 V Zener voltage, with absolute maximum total power dissipation of 1000 mW at 50 °C ambient. Sustained operation above 252 mA requires thermal derating per the 110 K/W junction-to-tie-point resistance and must remain within the 200 °C maximum junction temperature limit.
Can the 1N4729A,133 be used in AC-coupled or transient-suppression roles?
No - this is a DC-stabilized Zener diode optimized for steady-state voltage reference, not transient energy absorption. Its non-repetitive peak reverse current (1260 mA) applies only to short pulses (≤1/120 s), and it lacks the clamping speed or energy rating required for TVS or ESD protection applications.
How does the 1N4729A,133's thermal resistance affect PCB layout decisions?
With Rth(j-t) = 110 K/W at 4 mm lead length, PCB copper area around the anode/cathode pads acts as a primary heat sink. Layouts should use ≥25 mm² of 1 oz copper per terminal, avoid narrow traces, and maintain ≥4 mm straight lead length between body and board to meet thermal spec - otherwise derating below 1000 mW is mandatory.
Is the 1N4729A,133 compliant with modern RoHS and REACH requirements?
Yes - Nexperia confirms full compliance with RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006 for the 1N4729A,133, including exemption 7a for lead in glass encapsulation. Material declarations and CoC are available directly from Nexperia's product portal under document ID 1N4729A_SER.
1N4729A,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):
- 3.6 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 1 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
1N4729A,133 FAQ
1.How can I place an order for 1N4729A,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4729A,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 1N4729A,133 reliable?
The price and inventory of 1N4729A,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4729A,133 is usually 5 days.
3.What payment methods are accepted for 1N4729A,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4729A,133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4729A,133?
1N4729A,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4729A,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 1N4729A,133?
For technical support, including 1N4729A,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4729A,133 requirements.
6.How does Aetrix verify that 1N4729A,133 is sourced from the original manufacturer or authorized distributors?
All 1N4729A,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 1N4729A,133 meets industry standards.
7.What is the process for return or replacement of 1N4729A,133?
All 1N4729A,133 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4729A,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 1N4729A,133 part is unused and in its original packaging.
Return procedure for 1N4729A,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4729A,133 Tags
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