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Diodes Incorporated 1N4733A-T
- Part No.:
- 1N4733A-T
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4733A-T.pdf
- Description:
- DIODE ZENER 5.1V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:9,685
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Product details
Overview
1N4733A-T from Diodes Incorporated is a 1.0 W, 5.1 V ±5% Zener diode in DO-41 glass package, designed for precision voltage regulation and overvoltage protection in low-power linear power supplies, reference circuits, and signal clamping applications. It delivers 49 mA test current, 7.0 Ω dynamic impedance at IZT, <10 µA reverse leakage at 1.0 V, and operates across –65°C to +175°C.
For engineers reviewing the 1N4733A-T datasheet, 1N4733A-T pinout, 1N4733A-T application, or 1N4733A-T equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (175 °C/W), surge current rating (890 mA @ 8.3 ms), temperature coefficient (–0.01 to +0.04 %/°C), and DO-41 mechanical compatibility with through-hole PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable DC voltage under varying load and line conditions. Its sharp knee characteristic-verified by dual-point Zener impedance measurement at 1 mA and 20 mA-is critical for low-noise reference stability and fast transient response in analog feedback paths.
The device uses a glass-passivated silicon junction with cathode band polarity marking and Sn96.5Ag3.5 solderable terminals. Thermal derating begins above 50°C (6.67 mW/°C), requiring lead length control (9.5 mm) to sustain full 1.0 W dissipation at ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 5.1 V ±5% - defines regulated output voltage in shunt regulator designs with predictable tolerance stack-up |
| Test Current (IZT) | 49 mA - operating point where Zener voltage and impedance are specified; sets minimum bias for stable regulation |
| Zener Impedance (ZZT) | 7.0 Ω at IZT - determines AC ripple rejection and load regulation sensitivity in voltage reference circuits |
| Reverse Leakage Current | <10 µA at 1.0 V - ensures minimal quiescent current draw in standby or battery-backed systems |
| Surge Current (8.3 ms) | 890 mA - supports transient overvoltage suppression without failure during line spikes or ESD events |
| Temperature Coefficient | –0.01 to +0.04 %/°C - enables low-drift reference performance across industrial temperature range |
| Power Dissipation | 1.0 W at TA = 25°C - defines maximum continuous DC power handling before thermal shutdown or degradation |
Pinout & Package
DO-41 glass axial package with cathode band marking; leads are Sn96.5Ag3.5 solderable per MIL-STD-202, Method 208. Polarity is unambiguous: banded end is cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node in shunt regulation; carries full load current during regulation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input supply rail; maintains 5.1 V relative to anode when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| 1.0 W Power Rating | Sustains continuous regulation in 5–12 V auxiliary rails without heatsinking in standard PCB layouts |
| ±5% Voltage Tolerance | Enables direct replacement in legacy designs requiring tight initial accuracy without trimming resistors |
| Glass Passivation | Provides hermetic moisture barrier and UL 94V-0 flammability rating for reliability in harsh environments |
| Low Zener Impedance (7.0 Ω) | Minimizes output voltage variation under ±10% load current changes in precision reference applications |
Applications
| Low-Power Voltage Reference | Overvoltage Clamp for Microcontroller I/O |
|---|---|
Use Scenario: Providing stable 5.1 V bias for op-amp comparators and ADC reference inputs in sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise DC offset and gain-setting node. Use Value: Enables sub-1% total error budget in 12-bit measurement systems without active regulation or trimming. |
Use Scenario: Protecting 5 V-tolerant GPIO pins from ESD and bus transients in industrial HMI panels. IC Role / Device Role / Timing Role: Fast-acting crowbar element diverting >5.6 V surges to ground before IC damage occurs. Use Value: Limits pin voltage to ≤5.6 V during 8.3 ms surges up to 890 mA, meeting IEC 61000-4-2 Level 4 immunity. |
| Linear Regulator Feedback Divider | Power Supply Undervoltage Detection |
Use Scenario: Setting output voltage in adjustable 78Lxx-style regulators via resistor divider anchored to 5.1 V Zener. IC Role / Device Role / Timing Role: Precision voltage anchor replacing internal bandgap reference for improved accuracy. Use Value: Reduces output drift to ±2% over temperature vs. ±5% typical for untrimmed IC references. |
Use Scenario: Detecting brown-out conditions in 5 V embedded systems using comparator hysteresis with Zener-stabilized threshold. IC Role / Device Role / Timing Role: Stable voltage threshold generator enabling reliable reset assertion below 4.75 V. Use Value: Delivers consistent 4.85 V trip point (5.1 V × 0.95) with <0.1 V hysteresis, eliminating false resets. |
Availability
1N4733A-T is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage clamp, and linear regulator feedback applications requiring stable component supply and long-term obsolescence mitigation support.
Supply support for 1N4733A-T 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, cost-optimized components for industrial, computing, and consumer markets.
The 1N47xxA series belongs to Diodes' legacy Zener diode product line, engineered specifically for general-purpose voltage regulation and protection in cost-sensitive, high-volume applications with proven field reliability.
FAQ
What is the maximum continuous power dissipation for 1N4733A-T at 70°C ambient?
At 70°C ambient, the 1N4733A-T must be derated from its 1.0 W rating at 25°C. With a thermal derating factor of 6.67 mW/°C and a 45°C rise above 25°C, the allowable power is reduced by 300 mW, resulting in a maximum continuous dissipation of 700 mW. This assumes leads are held at 50°C with 9.5 mm length from case per datasheet Note 1.
How does the temperature coefficient affect regulation accuracy over –40°C to +85°C?
With a temperature coefficient of –0.01 to +0.04 %/°C, the 5.1 V nominal Zener voltage shifts by –2.04 mV to +3.4 mV per °C. Over a 125°C span, total drift ranges from –255 mV to +425 mV - approximately –5.0% to +8.3% of nominal. For high-accuracy use, this requires compensation or selection of tighter-coefficient alternatives like 1N4734A.
Can 1N4733A-T replace 1N4733A-A in the same PCB footprint?
Yes - both share identical DO-41 glass package dimensions, lead spacing, and polarity marking. The "-T" suffix denotes tape-and-reel packaging for automated assembly; the "-A" suffix indicates ammo pack. Electrical and thermal specifications are identical; only packaging format differs.
Is there a RoHS-compliant, lead-free version of this Zener diode?
Yes - the 1N4733A-T is explicitly marked as lead-free and RoHS compliant per EU Directive 2002/95/EC, with Sn96.5Ag3.5 terminations. No lead content is present in the finish, and exemptions for glass and high-temperature solder are applied only where permitted under Annex Notes 5 and 7.
1N4733A-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4733A-T FAQ
1.How can I place an order for 1N4733A-T through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4733A-T 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 1N4733A-T reliable?
The price and inventory of 1N4733A-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4733A-T is usually 5 days.
3.What payment methods are accepted for 1N4733A-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4733A-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4733A-T?
1N4733A-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4733A-T 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 1N4733A-T?
For technical support, including 1N4733A-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4733A-T requirements.
6.How does Aetrix verify that 1N4733A-T is sourced from the original manufacturer or authorized distributors?
All 1N4733A-T 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 1N4733A-T meets industry standards.
7.What is the process for return or replacement of 1N4733A-T?
All 1N4733A-T units undergo pre-shipment inspection (PSI). If there is an issue with 1N4733A-T, 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 1N4733A-T part is unused and in its original packaging.
Return procedure for 1N4733A-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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