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Nexperia USA Inc. 1N4747A,133
- Part No.:
- 1N4747A,133
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4747A,133.pdf
- Description:
- DIODE ZENER 20V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:6,011
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Product details
Overview
1N4747A,133 from Nexperia is a 20 V ±5 % Zener voltage regulator diode in a hermetically sealed SOD66 (DO-41) glass package, rated for 1000 mW total power dissipation and 12.5 mA test current, used for precision low-voltage stabilization in linear power supply feedback paths and reference circuits.
For engineers reviewing the 1N4747A,133 datasheet, 1N4747A,133 pinout, 1N4747A,133 application, or 1N4747A,133 equivalent, this page delivers verified Zener parameters, cathode/anode terminal mapping, thermal resistance (110 K/W), differential resistance (22 Ω), 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 20 V reference under regulated current conditions. It exhibits a typical differential resistance of 22 Ω at 12.5 mA test current and supports up to 500 mA forward 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, enabling reliable use in industrial ambient environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V nominal, ±5 % tolerance - ensures stable reference within ±1 V over production lot |
| Test Current (Itest) | 12.5 mA - defined operating point for VZ measurement and regulation accuracy |
| Differential Resistance (rdif) | 22 Ω - low dynamic impedance improves load regulation and ripple rejection |
| Total Power Dissipation (Ptot) | 1000 mW at Tamb = 50 °C - sets maximum continuous DC power handling in standard PCB layout |
| Reverse Current (IR) | ≤5 µA at VR = 15.2 V - confirms sharp knee and low leakage below regulation threshold |
| 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 leads; marking band denotes cathode terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (banded end) | Cathode | Connected to regulated output node in shunt configuration; carries reverse breakdown current |
| 2 (unbanded end) | Anode | Connected to ground or common reference; completes current path during Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass sealing | Prevents moisture ingress and long-term parameter drift in humid or high-reliability environments |
| ±5 % Zener voltage tolerance | Enables direct use in 20 V reference designs without post-production trimming or calibration |
| 110 K/W thermal resistance (j–t) | Allows accurate junction temperature estimation for derating calculations in fixed-ambient layouts |
| 22 Ω differential resistance | Minimizes output voltage shift under varying load currents in shunt-regulated supplies |
Applications
| Linear Power Supply Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in 24 V input/20 V output linear regulators using LM317 or discrete pass transistor topologies. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 20 V setpoint for error amplifier comparison. Use Value: Maintains output regulation within ±1 V across line and load variations due to tight 20 V ±5 % tolerance and low rdif. |
Use Scenario: Clamping transient surges on 20 V rail in industrial control I/O modules exposed to inductive switching noise. IC Role / Device Role / Timing Role: Passive overvoltage clamp absorbing energy above 20 V to protect downstream op-amps and ADCs. Use Value: Limits peak rail voltage to ≤21 V (20 V + 5 %) with <5 µA leakage below clamp threshold, minimizing standby power loss. |
| Low-Power Sensor Biasing | Calibration Reference Source |
Use Scenario: Providing stable excitation voltage for 4–20 mA loop-powered pressure transducers requiring 20 V ±0.5 V bias. IC Role / Device Role / Timing Role: Precision DC voltage source replacing higher-cost IC references where 1 % absolute accuracy suffices. Use Value: Delivers 20 V reference with <0.2 % drift over −40 °C to +85 °C ambient, validated by 200 °C max Tj rating. |
Use Scenario: Serving as traceable 20 V calibration point in handheld multimeter front-end circuitry during factory adjustment. IC Role / Device Role / Timing Role: Stable, repeatable voltage standard for analog-to-digital converter offset/gain trim routines. Use Value: Enables single-point calibration with known 20 V ±1 V accuracy and <22 Ω source impedance for low-error voltage injection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4747A-T | Same electrical specs; tape-and-reel packaging (vs. bulk/ammopack for ,133); identical SOD66 footprint | Optimized for automated SMT placement; no manual handling or lead-forming required | Select when integrating into high-volume PCB assembly with pick-and-place equipment |
| BZX55-C20 | 20 V ±5 %, but lower Ptot = 500 mW and higher rdif = 50 Ω; DO-35 package | Limited to lower-power reference roles; unsuitable for >500 mW dissipation or tight load regulation | Choose only for space-constrained designs where 1000 mW headroom and 22 Ω rdif are not required |
Compared with 1N4747A-T and BZX55-C20, the 1N4747A,133 offers full 1000 mW power capability and superior 22 Ω dynamic impedance-critical for maintaining 20 V stability under variable load in industrial power rails and precision analog references.
Availability
1N4747A,133 is available at Aetrix Electronics and suitable for linear power supply reference, overvoltage protection clamp, and low-power sensor biasing applications requiring stable component supply and consistent Zener voltage performance across production batches.
Supply support for 1N4747A,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 logic, discrete, and MOSFET solutions, with leadership in automotive-qualified and industrial-grade components.
The 1N47xxA series belongs to Nexperia's precision Zener diode product line, engineered specifically for stable voltage reference and shunt regulation in cost-sensitive, thermally demanding power management circuits.
FAQ
What is the maximum continuous power dissipation for 1N4747A,133?
The 1N4747A,133 is rated for 1000 mW total power dissipation at an ambient temperature of 50 °C. Derating is required above this temperature at 11.0 mW/°C, based on its 110 K/W junction-to-tie-point thermal resistance and specified maximum junction temperature of +200 °C.
How is polarity identified on the 1N4747A,133 package?
The cathode is marked by a distinct color band on the glass body of the SOD66 (DO-41) package. Pin 1 (cathode) is the banded end; Pin 2 (anode) is the unmarked end. This marking aligns with JEDEC DO-41 standards and is confirmed in Nexperia's official package outline diagram.
Can 1N4747A,133 be used in place of 1N4747A-T in a design?
Yes-electrically identical and mechanically compatible in SOD66 footprint-but 1N4747A,133 is supplied in bulk/ammopack format while 1N4747A-T uses tape-and-reel. Manual assembly or prototyping favors ,133; automated SMT production requires the -T variant for feeder compatibility.
What is the reverse leakage current specification at 15.2 V?
At 15.2 V reverse voltage (0.76 × VZ), the maximum reverse current is 5 µA, per Table 8 of the Nexperia datasheet. This low leakage ensures minimal quiescent current draw in standby mode and sharp turn-on behavior near the 20 V regulation threshold.
1N4747A,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):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 22 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 15.2 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
1N4747A,133 FAQ
1.How can I place an order for 1N4747A,133 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4747A,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 1N4747A,133 reliable?
The price and inventory of 1N4747A,133 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4747A,133 is usually 5 days.
3.What payment methods are accepted for 1N4747A,133?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4747A,133 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4747A,133?
1N4747A,133 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4747A,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 1N4747A,133?
For technical support, including 1N4747A,133 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4747A,133 requirements.
6.How does Aetrix verify that 1N4747A,133 is sourced from the original manufacturer or authorized distributors?
All 1N4747A,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 1N4747A,133 meets industry standards.
7.What is the process for return or replacement of 1N4747A,133?
All 1N4747A,133 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4747A,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 1N4747A,133 part is unused and in its original packaging.
Return procedure for 1N4747A,133:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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