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Vishay General Semiconductor - Diodes Division 1N4736A-TAP
- Part No.:
- 1N4736A-TAP
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4736A-TAP.pdf
- Description:
- DIODE ZENER 6.8V 1.3W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:24,874
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Product details
Overview
1N4736A-TAP from Vishay Semiconductors is a silicon planar power Zener diode rated for 6.8 V nominal Zener voltage at 37 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-to-medium-power DC stabilization circuits, such as power supply feedback paths and overvoltage protection clamps.
For engineers reviewing the 1N4736A-TAP datasheet, 1N4736A-TAP pinout, 1N4736A-TAP application, or 1N4736A-TAP equivalent, key selection criteria include its 6.8 V regulation accuracy, 3.5 Ω dynamic impedance at IZT, 133 mA maximum regulator current, thermal resistance of 110 K/W, and suitability for ambient temperatures up to +150 °C in PCB-mounted linear regulation designs.
Technical Context
The 1N4736A-TAP functions as a single-element, two-terminal shunt voltage regulator operating in reverse breakdown mode. Its Zener voltage is specified under thermal equilibrium conditions with lead temperature maintained at 30 °C ±1 °C at 9.5 mm from the diode body, ensuring stable DC regulation without transient thermal drift.
It exhibits a typical dynamic resistance of 3.5 Ω at 37 mA test current and 1 kHz frequency, enabling tight voltage control under varying load currents. The device supports surge current up to 660 mA (tp = 10 ms), making it suitable for transient suppression in conjunction with series limiting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.8 V nominal, ±5 % tolerance - defines precise DC reference point for feedback or clamp circuits |
| Test Current (IZT) | 37 mA - operating point where VZ and dynamic impedance are guaranteed |
| Dynamic Resistance (ZZT) | 3.5 Ω at 1 kHz - determines regulation stiffness against load current variation |
| Power Dissipation (Ptot) | 1300 mW - sets maximum continuous DC power handling at Tamb = 25 °C with leads cooled at 4 mm |
| Thermal Resistance (RthJA) | 110 K/W - enables thermal design margin estimation for PCB trace heatsinking |
| Reverse Leakage (IR) | 10 μA max at 4 V - ensures minimal quiescent current in standby or high-impedance bias networks |
| Junction Temperature (Tj) | 175 °C max - defines upper thermal limit for reliability in enclosed or high-ambient environments |
Pinout & Package
DO-41 (DO-204AL) axial-leaded through-hole package, approx. 310 mg weight, UL 94 V-0 molding compound, MSL level 1, compatible with standard wave or hand soldering (peak 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / cathode-referenced shunt node | Connected to lower-potential side of regulated circuit; forms return path during Zener operation |
| Cathode | Zener breakdown terminal / voltage reference output | Marked end (band); connected to higher-potential rail to establish stable 6.8 V reference relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Silicon planar construction | Ensures repeatable Zener voltage distribution and long-term stability under thermal cycling |
| ±5 % Zener voltage tolerance | Reduces need for post-assembly trimming in cost-sensitive voltage reference applications |
| 1.3 W power rating | Supports direct regulation of moderate-current analog rails (e.g., op-amp supplies) without external pass devices |
| Low dynamic impedance (3.5 Ω) | Maintains <±10 mV output deviation across ±10 mA load current changes at 6.8 V |
| DO-41 mechanical standardization | Enables drop-in replacement in legacy designs and compatibility with automated axial insertion equipment |
Applications
| Industrial Power Supply Feedback | Overvoltage Clamp for Microcontroller I/O |
|---|---|
Use Scenario: Stabilizing the secondary-side error amplifier reference in isolated AC/DC flyback converters. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 6.8 V setpoint to TL431 or optocoupler bias network. Use Value: Enables ±1 % output voltage regulation without auxiliary winding or digital compensation. |
Use Scenario: Protecting 5 V-tolerant GPIO pins from ESD or accidental 12 V misconnection. IC Role / Device Role / Timing Role: Fast-acting shunt clamp that conducts above 6.8 V to limit pin voltage. Use Value: Limits transient overvoltage to safe levels while drawing <100 μA at 5 V, preserving signal integrity. |
| Programmable Current Source Reference | Analog Sensor Excitation Bias |
Use Scenario: Setting fixed current through a 4–20 mA loop transmitter's sense resistor. IC Role / Device Role / Timing Role: Stable voltage reference driving a precision current mirror or op-amp-based Howland source. Use Value: Delivers 6.8 V reference with <0.05 %/°C TC, minimizing current drift over industrial temperature range. |
Use Scenario: Providing excitation voltage to resistive temperature detectors (RTDs) in process monitoring systems. IC Role / Device Role / Timing Role: Low-noise, low-drift DC bias source powering Wheatstone bridge arms. Use Value: Maintains bridge balance accuracy with <3.5 Ω output impedance, reducing sensitivity to lead resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4736A-TR | Same electrical specs; supplied in 14" tape-and-reel (5000 pcs), not ammopack | Optimized for SMT-compatible automated placement; requires reel-handling infrastructure | Select when integrating into high-volume pick-and-place production lines |
| BZX55C6V8 | 6.8 V ±5 %, but 500 mW rating and higher ZZT (10 Ω); DO-35 package | Limited to lower-power biasing; unsuitable for >650 mW continuous dissipation | Choose only for space-constrained PCBs where 1.3 W rating is unnecessary |
Compared with 1N4736A-TAP, the 1N4736A-TR offers identical regulation performance with logistics optimization for automated assembly, while BZX55C6V8 trades power capability for smaller footprint-neither is pin-compatible due to differing package geometries (DO-41 vs. DO-35), requiring layout revision.
Availability
1N4736A-TAP is available at Aetrix Electronics and suitable for industrial power supply feedback, overvoltage clamp for microcontroller I/O, and programmable current source reference requiring stable component supply and long-lifecycle availability.
Supply support for 1N4736A-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, and optoelectronics for industrial, automotive, and computing markets.
The 1N47xxA series was designed specifically for cost-effective, high-stability DC voltage regulation in legacy and new-design power management circuits where precision, ruggedness, and manufacturability are critical.
FAQ
What is the Zener voltage tolerance of the 1N4736A-TAP?
The 1N4736A-TAP has a nominal Zener voltage of 6.8 V with a tolerance of ±5 %, meaning its actual breakdown voltage falls between 6.46 V and 7.14 V when measured at 37 mA under thermal equilibrium conditions. This tolerance is verified per Vishay specification 85816 Rev. 2.7 and applies to all units in the 1N4736A-TAP production lot.
Can the 1N4736A-TAP be used in surface-mount designs?
No, the 1N4736A-TAP uses a DO-41 axial-leaded through-hole package and is not suitable for direct SMT assembly. For surface-mount equivalents, consider the SMAZ6.8 or BZT52B6V8, but note these differ in power rating, dynamic impedance, and thermal behavior. The 1N4736A-TAP must be mounted in plated-through holes with appropriate lead spacing.
What is the maximum continuous power dissipation for the 1N4736A-TAP at 70 °C ambient?
Per Figure 1 in Vishay document 85816, the 1N4736A-TAP's admissible power dissipation drops linearly from 1300 mW at 25 °C to approximately 850 mW at 70 °C ambient, assuming leads are held at ambient temperature at 4 mm from the case. Derating follows RthJA = 110 K/W, requiring thermal design validation for sustained operation.
Does the 1N4736A-TAP have a specified Zener impedance at low currents?
Yes, the 1N4736A-TAP specifies dynamic impedance ZZK = 700 Ω at IZT2 = 1 mA, indicating higher impedance in the knee region of the breakdown curve. This value is critical for low-current biasing applications where regulation accuracy degrades below ~5 mA; full 3.5 Ω ZZT is only guaranteed at the 37 mA test current.
Is the 1N4736A-TAP RoHS-compliant and halogen-free?
Yes, the 1N4736A-TAP conforms to RoHS Directive 2011/65/EU and is halogen-free per Vishay's material categorization policy (document 99912). The DO-41 molding compound meets UL 94 V-0 flammability rating, and the device carries no substance restrictions beyond those defined in the EU ELV and China RoHS directives.
1N4736A-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):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 1.3 W
- Impedance (Max) (Zzt):
- 3.5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 4 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)
1N4736A-TAP FAQ
1.How can I place an order for 1N4736A-TAP through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4736A-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 1N4736A-TAP reliable?
The price and inventory of 1N4736A-TAP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4736A-TAP is usually 5 days.
3.What payment methods are accepted for 1N4736A-TAP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4736A-TAP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4736A-TAP?
1N4736A-TAP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4736A-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 1N4736A-TAP?
For technical support, including 1N4736A-TAP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4736A-TAP requirements.
6.How does Aetrix verify that 1N4736A-TAP is sourced from the original manufacturer or authorized distributors?
All 1N4736A-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 1N4736A-TAP meets industry standards.
7.What is the process for return or replacement of 1N4736A-TAP?
All 1N4736A-TAP units undergo pre-shipment inspection (PSI). If there is an issue with 1N4736A-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 1N4736A-TAP part is unused and in its original packaging.
Return procedure for 1N4736A-TAP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4736A-TAP Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
Diodes Incorporated
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