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Microchip Technology 1N4735P/TR8
- Part No.:
- 1N4735P/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4735P/TR8.pdf
- Description:
- DIODE ZENER 6.2V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:8,987
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Product details
Overview
1N4735P/TR8 from Microsemi is a 1.0 W axial-lead silicon Zener diode with 6.2 V nominal zener voltage, ±5% tolerance (A-suffix), 41 mA test current, 2 Ω dynamic impedance at IZT, and 700 μA maximum reverse leakage at 4.96 V. It operates from –65°C to +150°C and regulates voltage in low-power reference and protection circuits.
For engineers reviewing the 1N4735P/TR8 datasheet, 1N4735P/TR8 pinout, 1N4735P/TR8 application, or 1N4735P/TR8 equivalent, key selection factors include its DO-41 package thermal resistance (45°C/W junction-to-lead), 1.2 V max forward voltage at 200 mA, 700 mA maximum zener current at 50°C, and RoHS-compliant "e3" variant availability.
Technical Context
This discrete Zener diode functions as a two-terminal voltage reference device operating in reverse breakdown mode. Its regulation performance is defined by a sharp knee at 41 mA test current, 2 Ω dynamic impedance, and stable 6.2 V output across 10 mA–700 mA operating current range.
It exhibits a temperature coefficient near zero (±0.05%/°C typical for 6.2 V devices per Microsemi Figure 3), enabling stable reference generation without external compensation. The DO-41 plastic package provides Level 1 moisture sensitivity and 0.7 g mass, with cathode band polarity marking and tin-lead or matte-tin terminations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.2 V ±5% at 41 mA - defines precise regulation point for reference circuits |
| Power Dissipation | 1.0 W at 25°C lead temperature - sets maximum continuous power handling before derating |
| Dynamic Impedance (ZZT) | 2 Ω at 41 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | 700 μA max at 4.96 V - confirms low standby current in undervoltage clamp applications |
| Thermal Resistance | 45°C/W junction-to-lead (3/8″ lead length) - enables thermal design with known junction rise |
| Operating Temperature | –65°C to +150°C - supports industrial and automotive under-hood environments |
| Forward Voltage | 1.2 V max at 200 mA - allows use as clamping diode in bidirectional protection schemes |
Pinout & Package
Package: DO-41 (JEDEC DO-204AL), axial-lead plastic molded epoxy case (UL94V-0), cathode indicated by color band. Terminals are tin-lead or RoHS-compliant matte tin, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node during Zener operation; forward conduction path when biased positively |
| Cathode | Banded end | Connected to higher-potential node during regulation; defines Zener breakdown polarity and voltage reference polarity |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxA series | Industry-standard footprint and electrical behavior for drop-in compatibility across legacy designs |
| Plastic P-suffix construction | Lower thermal resistance (45°C/W) vs. glass-body G-suffix variants, improving power handling in compact layouts |
| Level 1 moisture sensitivity | No dry pack required per IPC/JEDEC J-STD-020B - simplifies SMT reflow and storage logistics |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling in assembly |
| Tape-and-reel packaging | "TR8" suffix denotes EIA-296 standard 8 mm tape - enables automated pick-and-place placement |
Applications
| Overvoltage Clamp in Sensor Signal Conditioning | Low-Power Voltage Reference for ADC Biasing |
|---|---|
Use Scenario: Protects analog front-end inputs of industrial pressure sensors from transient surges up to ±15 V. IC Role / Device Role / Timing Role: Two-terminal shunt regulator clamping signal rail to 6.2 V, diverting excess current to ground. Use Value: Prevents ADC input saturation and latch-up using only 1N4735P/TR8's 2 Ω ZZT and 700 μA IR at 4.96 V. | Use Scenario: Provides stable 6.2 V reference for 12-bit SAR ADC bias in battery-powered IoT node. IC Role / Device Role / Timing Role: Passive voltage reference source with <±0.05%/°C TC, replacing precision IC references where cost and size are critical. Use Value: Delivers 6.2 V ±5% accuracy over –40°C to +85°C with no active components or trimming required. |
| DC Power Rail Stabilization in Legacy Control Boards | ESD Protection Element in RS-232 Interface |
Use Scenario: Stabilizes +5 V logic rail in aging PLC backplane where LDOs have failed. IC Role / Device Role / Timing Role: Shunt regulator absorbing line ripple and load-step-induced overshoot on unregulated supply. Use Value: Maintains regulation within ±0.1 V using 1N4735P/TR8's 41 mA IZT and 1.0 W dissipation capability. | Use Scenario: Added to RS-232 TX/RX lines to suppress ±8 kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor leveraging forward conduction (1.2 V) and reverse Zener action (6.2 V). Use Value: Clamps fast transients with sub-1 ns response and withstands repeated 700 mA surge current per Microsemi spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4735A | No "P" suffix: glass-body (DO-35), higher thermal resistance (105°C/W junction-to-ambient) | Less suitable for high-power-density PCBs due to inferior heat dissipation | Select 1N4735P/TR8 when DO-41 mechanical robustness and lower RθJL are required |
| MMSZ4704T1G | Surface-mount SOD-123 package, 6.2 V ±5%, 500 mW rating, 2.5 Ω ZZT | Not interchangeable without layout change; lower power and different thermal profile | Choose MMSZ4704T1G only for space-constrained SMT designs accepting 500 mW limit |
Compared with 1N4735A and MMSZ4704T1G, the 1N4735P/TR8 offers superior thermal performance in through-hole applications and standardized tape-and-reel delivery, while maintaining identical electrical regulation specs-making it optimal for legacy board repair and high-reliability industrial control.
Availability
1N4735P/TR8 is available at Aetrix Electronics and suitable for overvoltage clamping, low-power voltage referencing, and DC rail stabilization requiring stable component supply in industrial automation, sensor modules, and legacy control systems.
Supply support for 1N4735P/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N47xxAP series was designed specifically for ruggedized, cost-effective voltage regulation in harsh-environment electronics where JEDEC-standard form factor, thermal resilience, and long-term parametric stability are essential.
FAQ
What is the zener voltage tolerance of the 1N4735P/TR8?
The 1N4735P/TR8 has a nominal zener voltage of 6.2 V with ±5% tolerance, indicated by the "A" suffix in its part number per Microsemi documentation. This means the actual measured VZ at 41 mA test current falls between 5.89 V and 6.51 V at 25°C lead temperature. The tolerance remains valid across the full –65°C to +150°C operating range, though temperature coefficient effects apply.
Does the 1N4735P/TR8 require dry packing before reflow soldering?
No, the 1N4735P/TR8 does not require dry packing. It is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored indefinitely at ambient conditions and subjected to standard reflow profiles-including lead-free-without preconditioning. This is confirmed in Microsemi's datasheet Rev C, page 1, under "MECHANICAL AND PACKAGING".
What is the maximum steady-state zener current for the 1N4735P/TR8 at 50°C ambient?
The maximum regulator current (IZM) for the 1N4735P/TR8 is 700 mA at TL = 50°C, as specified in the Electrical Characteristics table on page 2 of the Microsemi datasheet. This value assumes 3/8″ (10 mm) lead length from the body and accounts for thermal derating above 25°C. At higher ambient temperatures, current must be reduced per the power derating curve in Figure 1.
Can the 1N4735P/TR8 be used as a bidirectional ESD protector?
Yes-the 1N4735P/TR8 functions bidirectionally: in reverse bias it regulates at 6.2 V, and in forward bias it conducts at ≤1.2 V (max at 200 mA). This dual-mode behavior makes it effective for low-energy ESD clamping on signal lines, as validated by Microsemi's MIL-STD-750 Method 1020 ESD immunity rating and 700 mA surge current capability per Note 3.
Is the 1N4735P/TR8 RoHS compliant?
Yes, the 1N4735P/TR8 is RoHS compliant. Microsemi explicitly states that "RoHS Compliant devices are available by adding 'e3' suffix", and the "TR8" tape-and-reel designation is compatible with e3 termination plating (annealed matte tin). The device meets EU RoHS Directive 2011/65/EU requirements, with lead content below 1000 ppm and no restricted substances above threshold limits.
1N4735P/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):
- 6.2 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 3 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)
1N4735P/TR8 FAQ
1.How can I place an order for 1N4735P/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4735P/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 1N4735P/TR8 reliable?
The price and inventory of 1N4735P/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4735P/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4735P/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4735P/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4735P/TR8?
1N4735P/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4735P/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 1N4735P/TR8?
For technical support, including 1N4735P/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4735P/TR8 requirements.
6.How does Aetrix verify that 1N4735P/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4735P/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 1N4735P/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4735P/TR8?
All 1N4735P/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4735P/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 1N4735P/TR8 part is unused and in its original packaging.
Return procedure for 1N4735P/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4735P/TR8 Tags
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