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Microchip Technology 1N4736P/TR8
- Part No.:
- 1N4736P/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4736P/TR8.pdf
- Description:
- DIODE ZENER 6.8V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,087
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Product details
Overview
1N4736P/TR8 from Microsemi is a 1.0 W axial-lead silicon Zener diode with nominal zener voltage 6.8 V ±5%, 37 mA test current (IZT), 3.5 Ω dynamic impedance (ZZT), and maximum reverse current 10 μA at 4 V (VR). It regulates voltage in power supply reference, overvoltage protection, and biasing circuits across -65°C to +150°C operating temperature.
For engineers reviewing the 1N4736P/TR8 datasheet, 1N4736P/TR8 pinout, 1N4736P/TR8 application, or 1N4736P/TR8 equivalent, key selection factors include its DO-41 package thermal resistance (45°C/W junction-to-lead), 1.2 V forward voltage max at 200 mA, RoHS-compliant "e3" plating option, and tape-and-reel packaging (TR8 suffix).
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage across variable load or line conditions. Its regulation performance is defined at 37 mA test current with sharp knee characteristics verified by dual-point impedance measurement per MicroNote 202.
Thermal design relies on junction-to-lead resistance (45°C/W at 10 mm lead length) rather than ambient-based derating when leads are adequately heatsunk; on FR4 PCBs with specified copper area, junction-to-ambient resistance rises to 105°C/W, limiting steady-state power to 1.0 W only below 45°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 6.8 V ±5% at 37 mA - defines precise regulation point for reference and clamp circuits |
| Power Dissipation | 1.0 W at 25°C lead temperature - requires thermal management above 105°C lead temp per derating curve |
| Dynamic Impedance (ZZT) | 3.5 Ω at 37 mA - low impedance ensures minimal output voltage variation under load changes |
| Reverse Current (IR) | 10 μA max at 4 V - confirms tight leakage control for low-power standby regulation |
| Forward Voltage (VF) | 1.2 V max at 200 mA - enables use as forward-biased clamping or protection diode when needed |
| Operating Temperature | -65°C to +150°C - supports industrial and automotive under-hood applications without derating |
| Knee Impedance (ZZK) | 133 Ω at 0.25 mA - characterizes low-current regulation onset for precision bias networks |
Pinout & Package
DO-41 (JEDEC DO-204AL) plastic molded package with axial leads; cathode indicated by color band; polarity critical-banded end must be positive during Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded lead | Connected to lower-potential node; forward conduction path when biased positively |
| Cathode | Banded lead | Connected to higher-potential node; reverse-biased terminal where Zener regulation occurs |
Key Features
| Feature | Design Value |
|---|---|
| Moisture Sensitivity Level | Level 1 per J-STD-020B - no dry pack required, simplifies SMT handling and storage |
| ESD Robustness | Nonsensitive per MIL-STD-750 Method 1020 - withstands typical board-level ESD events without parameter shift |
| RoHS Compliance | e3 suffix option - matte-tin plating meets lead-free soldering requirements up to 260°C/10 s |
| Tape-and-Reel Packaging | TR8 suffix - standard EIA-296 format enables automated pick-and-place assembly |
| Thermal Resistance | 45°C/W junction-to-lead - enables high-power operation with minimal lead-length heatsinking |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stable 6.8 V reference for linear regulator feedback or ADC reference divider. IC Role / Device Role / Timing Role: Voltage reference element providing fixed potential against which output is regulated. Use Value: 6.8 V ±5% tolerance and 3.5 Ω dynamic impedance ensure <±10 mV output drift under 10 mA load variation. |
Use Scenario: Protection circuit limiting input voltage to 6.8 V before sensitive analog front-end stages. IC Role / Device Role / Timing Role: Shunt overvoltage protector diverting surge current away from downstream ICs. Use Value: 1.0 W power rating and 133 Ω knee impedance enable reliable clamping of 100–500 mA transients without thermal runaway. |
| Bias Network Stabilizer | Temperature-Compensated Reference |
Use Scenario: Setting base-emitter voltage in transistor amplifier bias chains requiring stable DC operating point. IC Role / Device Role / Timing Role: DC voltage stabilizer maintaining fixed bias current despite supply ripple or temperature drift. Use Value: -65°C to +150°C operating range and low 3.5 Ω ZZT minimize bias current variation across industrial environments. |
Use Scenario: Paired with complementary Zener (e.g., 1N4733A) to form temperature-stable reference string. IC Role / Device Role / Timing Role: Component in compensated reference network leveraging opposite TC slopes of low- and high-voltage Zeners. Use Value: 6.8 V nominal voltage places it near zero-TC crossover region (per Figure 3), enabling <±0.05%/°C net TC when combined. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4736A | No TR8 tape-and-reel; same electrical specs and DO-41 package | Manual or bulk assembly only; not suitable for automated SMT lines | Select 1N4736P/TR8 when reel-fed placement is required; choose 1N4736A for hand-soldered prototypes or low-volume builds |
| MMBZ5235B-TP | SOT-23 surface-mount package; 6.8 V ±5%, 37 mA IZT, but only 200 mW power rating | Limited to low-power signal-level clamping; cannot replace 1N4736P/TR8 in 1 W applications | Use MMBZ5235B-TP only where board space constraints prohibit axial DO-41; verify thermal margin for >200 mW loads |
Compared with 1N4736A and MMBZ5235B-TP, the 1N4736P/TR8 uniquely combines full 1.0 W dissipation, DO-41 mechanical robustness, and EIA-296 tape-and-reel compatibility-making it the sole choice for high-reliability, high-power, automated production environments requiring axial-leaded Zeners.
Availability
1N4736P/TR8 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and bias network stabilization requiring stable component supply across industrial, automotive, and instrumentation programs.
Supply support for 1N4736P/TR8 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N4736P/TR8 belongs to Microsemi's legacy 1N47xxAP series of 1 W plastic Zener diodes, engineered for stable voltage regulation in harsh-environment power systems where long-term parametric stability and moisture immunity are critical.
FAQ
What is the Zener voltage tolerance of the 1N4736P/TR8?
The 1N4736P/TR8 has a nominal Zener voltage of 6.8 V with ±5% tolerance, as confirmed by the "A" suffix in its JEDEC designation and verified in the Electrical Characteristics table. This tolerance applies at 37 mA test current and 25°C lead temperature. The 1N4736P/TR8 does not offer tighter tolerances (e.g., ±1% or ±2%)-those require different suffixes (D or C) not present in this part number.
Does the 1N4736P/TR8 support lead-free soldering processes?
Yes-the "e3" in the full manufacturer part number (1N4736P e3/TR8) indicates RoHS-compliant matte-tin plating, qualified for lead-free reflow up to 260°C for 10 seconds per MIL-STD-750 Method 2026. The 1N4736P/TR8 maintains full specification compliance under these conditions, including thermal resistance and voltage regulation performance.
What is the maximum continuous reverse current for the 1N4736P/TR8 at 4 V?
The 1N4736P/TR8 specifies a maximum reverse current (IR) of 10 μA at 4 V test voltage (VR), per the Electrical Characteristics table. This value is measured at 25°C and reflects leakage behavior well below the Zener knee, confirming suitability for low-quiescent-current bias and reference applications where minimal parasitic drain is essential.
How does thermal resistance differ between lead-mounted and PCB-mounted configurations for the 1N4736P/TR8?
When leads are heatsunk at 10 mm from the body, the 1N4736P/TR8 exhibits 45°C/W junction-to-lead thermal resistance. On a standard FR4 PCB (1 oz Cu, 4 mm² pads, 1 mm × 25 mm trace), junction-to-ambient resistance rises to 105°C/W-reducing usable power to 1.0 W only below 45°C ambient. This distinction is critical for thermal design: lead-mounting enables full 1 W operation at higher ambient temperatures.
Is the 1N4736P/TR8 suitable for surge protection applications?
The 1N4736P/TR8 supports transient surge currents up to 660 mA (ISM) per half-sine pulse (1/120 s), as specified in the Electrical Characteristics table. While effective for moderate-energy transients in power rails or signal lines, it is not rated for lightning or high-energy ESD events-those require dedicated TVS diodes like SMAJ6.8A. Use the 1N4736P/TR8 for regulated clamping, not primary surge suppression.
1N4736P/TR8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 6.8 V
- Tolerance:
- ±10%
- Power - Max:
- 1 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:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
1N4736P/TR8 FAQ
1.How can I place an order for 1N4736P/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4736P/TR8 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 1N4736P/TR8 reliable?
The price and inventory of 1N4736P/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4736P/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4736P/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4736P/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4736P/TR8?
1N4736P/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4736P/TR8 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 1N4736P/TR8?
For technical support, including 1N4736P/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4736P/TR8 requirements.
6.How does Aetrix verify that 1N4736P/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4736P/TR8 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 1N4736P/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4736P/TR8?
All 1N4736P/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4736P/TR8, 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 1N4736P/TR8 part is unused and in its original packaging.
Return procedure for 1N4736P/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4736P/TR8 Tags
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MM5Z5V1ST1G
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