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Vishay General Semiconductor - Diodes Division 1N4728A-TAP
- Part No.:
- 1N4728A-TAP
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4728A-TAP.pdf
- Description:
- DIODE ZENER 3.3V 1.3W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:24,770
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Product details
Overview
1N4728A-TAP from Vishay Semiconductors is a silicon planar power Zener diode rated for 3.3 V nominal Zener voltage at 76 mA test current, with ±5 % tolerance, 1.3 W power dissipation, and DO-41 package. It operates as a precision voltage reference or shunt regulator in low-power stabilization circuits, delivering stable regulation under thermal equilibrium conditions with 10 Ω typical dynamic impedance.
For engineers reviewing the 1N4728A-TAP datasheet, 1N4728A-TAP pinout, 1N4728A-TAP application, or 1N4728A-TAP equivalent, key selection criteria include Zener voltage accuracy, surge current capability (1380 mA), reverse leakage (<1 μA at 1 V), thermal resistance (110 K/W), and compliance with MSL Level 1 soldering profiles.
Technical Context
This discrete Zener diode functions as a two-terminal shunt voltage regulator, maintaining a stable 3.3 V output across varying load currents by operating in reverse breakdown. Its design relies on silicon planar junction technology to ensure consistent voltage regulation and low dynamic impedance (10 Ω at IZT).
It is characterized at thermal equilibrium with lead temperature held at 30 °C ±1 °C, 9.5 mm from the diode body, and requires ambient-temperature-controlled leads (4 mm from case) for rated power dissipation. The device supports DC and low-frequency stabilization only-no AC or high-speed switching functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.3 V nominal ±5 % - defines precise regulation point for 3.3 V rail referencing |
| Test Current (IZT) | 76 mA - required bias current to achieve specified VZ under thermal equilibrium |
| Power Dissipation (Ptot) | 1300 mW - maximum steady-state power at Tamb = 25 °C with leads thermally managed |
| Dynamic Resistance (ZZT) | 10 Ω typical at 76 mA - determines regulation stiffness and load-induced voltage deviation |
| Reverse Leakage (IR) | <1 μA at 1 V - ensures minimal quiescent current in standby or low-voltage clamp modes |
| Surge Current (IZM) | 1380 mA peak (tp = 10 ms) - supports transient overvoltage clamping without failure |
| Junction Temperature | 175 °C max - sets upper thermal limit for reliable long-term operation |
Pinout & Package
DO-41 (DO-204AL) axial-leaded through-hole package: cylindrical black epoxy body (Ø2.6 mm max, length 4.1 mm max), cathode identified by band, lead diameter 0.7–0.86 mm, weight ≈310 mg, UL 94 V-0 rated molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to circuit ground or lower potential; carries forward current up to 200 mA (VF ≤ 1.2 V) |
| Cathode | Zener breakdown terminal / regulated output node | Connected to voltage rail being stabilized; sinks reverse current to maintain 3.3 V under load variation |
Key Features
| Feature | Design Value |
|---|---|
| Silicon planar junction construction | Ensures repeatable Zener voltage and low parameter drift over time and temperature |
| ±5 % Zener voltage tolerance | Enables direct use in cost-sensitive 3.3 V reference designs without post-production trimming |
| 110 K/W junction-to-ambient thermal resistance | Allows full 1.3 W power handling only with proper PCB copper pour and lead thermal management |
| MSL Level 1 moisture sensitivity | Permits standard reflow or hand-soldering without baking preconditioning |
| UL 94 V-0 flammability rating | Meets safety requirements for enclosed industrial and consumer power supplies |
Applications
| Industrial Power Supply Monitoring | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Monitoring +5 V or +3.3 V rails in PLC I/O modules to trigger fault shutdown before overvoltage damage. IC Role / Device Role / Timing Role: Shunt regulator providing precise 3.3 V reference for comparator input in supervisor ICs. Use Value: Enables accurate threshold detection with <1 μA leakage, minimizing false triggers during brown-out conditions. |
Use Scenario: Generating clean reset signal for ARM Cortex-M0 microcontrollers during power-up and brown-out events. IC Role / Device Role / Timing Role: Zener-clamped RC network defining reset pulse width and voltage threshold. Use Value: Delivers stable 3.3 V reference with 10 Ω dynamic impedance, ensuring predictable reset timing across temperature. |
| Low-Cost Sensor Signal Conditioning | LED Driver Bias Reference |
Use Scenario: Providing excitation voltage for resistive temperature detectors (RTDs) in HVAC thermostats. IC Role / Device Role / Timing Role: Two-terminal voltage reference stabilizing bridge excitation current source. Use Value: Maintains 3.3 V ±5 % over 0–70 °C, enabling ±0.5 °C temperature measurement accuracy without calibration. |
Use Scenario: Setting reference voltage for constant-current LED driver ICs in signage backlighting. IC Role / Device Role / Timing Role: Shunt reference establishing feedback node voltage for current-sense amplifier. Use Value: Supports 76 mA test current capability and 1380 mA surge rating, accommodating LED turn-on transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A-TR | Same electrical specs; tape-and-reel packaging (5000/reel) vs. ammopack (5000/ammopack) | Optimized for automated SMT placement; requires compatible pick-and-place feeders | Select 1N4728A-TR for high-volume production; 1N4728A-TAP suits prototyping and low-volume manual assembly |
| BZX55C3V3 | 3.3 V ±5 %, but lower Ptot = 500 mW and higher ZZT = 95 Ω - less regulation stiffness | Suitable only for ultra-low-power biasing; cannot sustain 76 mA continuous or 1380 mA surge | Choose BZX55C3V3 only where power budget is <0.5 W and dynamic load rejection is non-critical |
Compared with 1N4728A-TAP, the 1N4728A-TR offers identical regulation performance in automated manufacturing, while BZX55C3V3 trades power capability and regulation precision for smaller size and lower cost in non-demanding bias applications.
Availability
1N4728A-TAP is available at Aetrix Electronics and suitable for industrial power supply monitoring, microcontroller reset circuits, low-cost sensor signal conditioning, and LED driver bias reference requiring stable component supply and long-lifecycle support.
Supply support for 1N4728A-TAP 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
Vishay Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for industrial, automotive, and computing markets.
The 1N47xxA series was designed specifically for cost-effective, high-stability DC voltage regulation in power supply feedback, reference, and protection circuits-emphasizing repeatability, thermal robustness, and broad operating temperature range.
FAQ
What is the Zener voltage tolerance of the 1N4728A-TAP?
The 1N4728A-TAP has a nominal Zener voltage of 3.3 V with a tolerance of ±5 %, meaning its actual breakdown voltage falls between 3.135 V and 3.465 V when measured at 76 mA test current under thermal equilibrium. This tolerance is guaranteed per Vishay's Rev. 2.7 datasheet (Document Number: 85816) and applies to all units in the 1N4728A-TAP production lot.
Can the 1N4728A-TAP be used in surface-mount designs?
No-the 1N4728A-TAP uses a DO-41 axial-leaded through-hole package and is not suitable for surface-mount assembly. It requires plated-through holes and wave or hand soldering. For SMT-compatible alternatives, consider the SMA- or SOD-123-packaged equivalents like BZT52-B3V3, but note their lower power rating (300–500 mW) and different dynamic impedance.
What is the maximum surge current rating for the 1N4728A-TAP?
The 1N4728A-TAP supports a peak surge current of 1380 mA for pulse width tp = 10 ms, as specified in the Absolute Maximum Ratings table. This rating assumes proper thermal management of leads and is validated per JEDEC test conditions. Exceeding this value risks irreversible junction damage even if average power remains within 1300 mW limits.
Does the 1N4728A-TAP require heatsinking in standard operation?
Heatsinking is not required for the 1N4728A-TAP at ambient temperatures ≤50 °C and power dissipation ≤1300 mW, provided its leads are maintained at ambient temperature within 4 mm of the case per Vishay's thermal specification. However, PCB copper pour (≥1 cm² per lead) is recommended above 70 °C ambient to sustain full-rated power without exceeding 175 °C junction temperature.
How does the 1N4728A-TAP compare to the 1N4728A-TR in electrical performance?
The 1N4728A-TAP and 1N4728A-TR share identical electrical specifications-including 3.3 V Zener voltage, 76 mA test current, 10 Ω dynamic resistance, and 1300 mW power rating-differing only in packaging format (ammopack vs. tape-and-reel). Both meet the same Vishay qualification standards and may be substituted electrically without design change.
1N4728A-TAP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 1.3 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:
- 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
1N4728A-TAP FAQ
1.How can I place an order for 1N4728A-TAP through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4728A-TAP 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 1N4728A-TAP reliable?
The price and inventory of 1N4728A-TAP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4728A-TAP is usually 5 days.
3.What payment methods are accepted for 1N4728A-TAP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4728A-TAP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4728A-TAP?
1N4728A-TAP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4728A-TAP 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 1N4728A-TAP?
For technical support, including 1N4728A-TAP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4728A-TAP requirements.
6.How does Aetrix verify that 1N4728A-TAP is sourced from the original manufacturer or authorized distributors?
All 1N4728A-TAP 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 1N4728A-TAP meets industry standards.
7.What is the process for return or replacement of 1N4728A-TAP?
All 1N4728A-TAP units undergo pre-shipment inspection (PSI). If there is an issue with 1N4728A-TAP, 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 1N4728A-TAP part is unused and in its original packaging.
Return procedure for 1N4728A-TAP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4728A-TAP Tags
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