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Microchip Technology 1N4735CP/TR8
- Part No.:
- 1N4735CP/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4735CP/TR8.pdf
- Description:
- DIODE ZENER 6.2V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,943
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Product details
Overview
1N4735CP/TR8 from Microsemi is a 1.0 W silicon Zener diode with nominal zener voltage of 6.2 V ±5%, designed for precision voltage regulation in power supply feedback loops, reference circuits, and overvoltage protection. It operates across –65°C to +150°C, delivers 41 mA test current (IZT), exhibits 2 Ω dynamic impedance (ZZT) at IZT, and features DO-41 axial-leaded plastic package.
For engineers reviewing the 1N4735CP/TR8 datasheet, 1N4735CP/TR8 pinout, 1N4735CP/TR8 application, or 1N4735CP/TR8 equivalent, key selection factors include its 6.2 V regulation tolerance, 1.0 W steady-state dissipation at TL < 105°C, 45 °C/W junction-to-lead thermal resistance, RoHS-compliant "e3" plating, and tape-and-reel packaging (TR8).
Technical Context
The 1N4735CP/TR8 functions as a reverse-biased voltage reference device, maintaining stable output voltage under varying load and temperature conditions. Its sharp breakdown knee-verified by dual-point Zener impedance measurement per MicroNote 202-ensures reliable regulation at 41 mA test current and supports stable operation up to 146 mA maximum regulator current (IZM) at TA = 50°C.
It employs a void-free thermosetting epoxy body (UL94V-0 rated) with tin-lead or RoHS-compliant matte-tin plating, and is moisture-sensitive Level 1 per IPC/JEDEC J-STD-020B-no dry pack required. Polarity is marked by cathode band; regulation occurs with banded end positive relative to anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.2 V ±5% at 41 mA - defines precise regulation point for feedback networks |
| Power Dissipation | 1.0 W at TL < 105°C (3/8″ lead length) - sets maximum continuous thermal load |
| Dynamic Impedance (ZZT) | 2 Ω @ 41 mA - ensures minimal output voltage variation under load transients |
| Max Regulator Current (IZM) | 146 mA at TA = 50°C - determines usable current range before thermal derating |
| Thermal Resistance | 45 °C/W junction-to-lead - enables accurate thermal modeling with standard lead mounting |
| Reverse Leakage | 10 μA @ 4.96 V - guarantees low standby power loss in high-impedance bias networks |
| Forward Voltage | ≤1.2 V @ 200 mA - supports use as clamp or protection diode in forward conduction |
Pinout & Package
Package: DO-41 (DO-204AL), axial-leaded plastic case with cathode band marking. Body diameter 2.0–2.7 mm, overall length 4.5–5.5 mm, lead diameter 0.4–0.6 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node in Zener configuration | Connected to circuit common; reverse-bias polarity requires cathode at higher potential |
| Cathode | Regulated output node in Zener configuration | Banded end; must be held at voltage ≥6.2 V relative to anode to enable regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 5% tolerance | Guarantees VZ within ±5% of 6.2 V at 41 mA, enabling predictable loop gain in feedback designs |
| RoHS-compliant "e3" plating | Matte-tin termination meets lead-free soldering requirements without compromising solderability or reliability |
| Tape-and-reel packaging (TR8) | Standard EIA-296 format supports automated SMT placement despite axial-leaded form factor |
| Moisture sensitivity Level 1 | Eliminates baking preconditioning prior to assembly-reduces manufacturing overhead and risk of damage |
| Nonsensitive to ESD | Withstands MIL-STD-750 Method 1020 testing-no special handling needed during board assembly |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback or forward converter feedback paths using optocoupler-coupled error amplifiers. IC Role / Device Role / Timing Role: Zener reference providing precise 6.2 V threshold to TL431 or similar shunt regulator ICs. Use Value: Enables ±1% output regulation accuracy by fixing reference voltage independent of input line or load variation. | Use Scenario: Providing stable excitation voltage for resistive bridge sensors (e.g., strain gauges, RTDs) in harsh industrial environments. IC Role / Device Role / Timing Role: Low-drift voltage reference source for analog front-end biasing. Use Value: Maintains sensor linearity and repeatability across –40°C to +85°C due to tight 5% VZ tolerance and low ZZT. |
| Overvoltage Clamp Protection | Microcontroller Reset Circuit |
Use Scenario: Clamping transient surges on 5 V or 3.3 V rails caused by inductive switching or ESD events. IC Role / Device Role / Timing Role: Shunt protection element diverting excess current above safe rail voltage. Use Value: Limits peak voltage to ≤6.2 V + IR × ZZT, preventing latch-up or damage to downstream logic. | Use Scenario: Generating clean, temperature-stable reset signal for microcontrollers during power-up or brownout. IC Role / Device Role / Timing Role: Regulation element in RC-based reset generator with hysteresis. Use Value: Ensures reset assertion until VCC reaches ≥6.2 V, eliminating premature release due to supply ripple. |
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 package; higher thermal resistance (105 °C/W vs. 45 °C/W) | Limited to lower-power or ambient-cooled designs; unsuitable for high-density PCBs requiring thermal efficiency | Select 1N4735CP/TR8 when thermal performance or RoHS compliance is required |
| MMSZ4702T1G | Surface-mount SOD-123 package; 6.2 V ±5%; 500 mW rating; 10 Ω ZZT @ 10 mA | Lower power and higher impedance limit use to low-current references or clamps; not drop-in for through-hole layouts | Choose MMSZ4702T1G only for space-constrained, low-power SMT designs where 1N4735CP/TR8's axial form is impractical |
Compared with 1N4735A and MMSZ4702T1G, the 1N4735CP/TR8 uniquely balances 1.0 W power handling, low 2 Ω dynamic impedance, DO-41 mechanical robustness, and TR8 automation compatibility-making it optimal for industrial power supplies and ruggedized analog systems requiring proven thermal and reliability performance.
Availability
1N4735CP/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioning, overvoltage protection circuits, and microcontroller reset networks requiring stable component supply and long-term lifecycle support.
Supply support for 1N4735CP/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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N47xxAP series was engineered specifically for cost-effective, high-stability voltage regulation in commercial and industrial power systems-emphasizing thermal efficiency, JEDEC compliance, and broad environmental operating range.
FAQ
What is the zener voltage tolerance of the 1N4735CP/TR8?
The 1N4735CP/TR8 has a nominal zener voltage of 6.2 V with a ±5% tolerance, as indicated by the "A" suffix in its JEDEC designation. This tolerance is guaranteed at 41 mA test current and 25°C lead temperature. The "P" denotes plastic DO-41 packaging, and "TR8" specifies tape-and-reel packaging per EIA-296. The 1N4735CP/TR8 maintains this specification across its full operating temperature range of –65°C to +150°C.
Does the 1N4735CP/TR8 meet RoHS requirements?
Yes, the 1N4735CP/TR8 is RoHS compliant, confirmed by the "e3" suffix in its full manufacturer part number (1N4735CP/TR8-e3). It uses annealed matte-tin plating per MIL-STD-750 Method 2026 and void-free UL94V-0 epoxy encapsulation. All materials and processes comply with EU Directive 2011/65/EU, including restrictions on lead, cadmium, mercury, hexavalent chromium, PBB, and PBDE.
What is the maximum allowable current for continuous operation of the 1N4735CP/TR8?
The 1N4735CP/TR8 supports a maximum regulator current (IZM) of 146 mA at TA = 50°C, derived from its 1.0 W power rating and thermal derating curve. At higher ambient temperatures, current must be reduced per Figure 1 in the datasheet. For sustained operation at 25°C ambient on FR4 with 4 mm² copper pads, the practical continuous current is limited to ~110 mA to maintain junction temperature below 150°C.
How does the thermal resistance of the 1N4735CP/TR8 compare between lead and ambient mounting?
The 1N4735CP/TR8 has a junction-to-lead thermal resistance of 45 °C/W at 3/8″ (10 mm) lead length, but junction-to-ambient rises to 105 °C/W when mounted on standard FR4 with 1 oz Cu, 4 mm² pads, and 1 mm × 25 mm traces. This 2.3× difference means heatsinking via leads is significantly more effective than relying on PCB conduction alone-critical for high-duty-cycle regulation in the 1N4735CP/TR8.
Can the 1N4735CP/TR8 be used in surface-mount designs?
No-the 1N4735CP/TR8 is an axial-leaded DO-41 device and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMAJ4735A and MLL4735A families. While the "TR8" suffix indicates tape-and-reel packaging, the 1N4735CP/TR8 itself requires through-hole insertion and wave or selective soldering. Attempting reflow soldering will exceed its 260°C/10s max solder temperature rating and damage the epoxy body.
1N4735CP/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:
- ±2%
- 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)
1N4735CP/TR8 FAQ
1.How can I place an order for 1N4735CP/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4735CP/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 1N4735CP/TR8 reliable?
The price and inventory of 1N4735CP/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4735CP/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4735CP/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4735CP/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4735CP/TR8?
1N4735CP/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4735CP/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 1N4735CP/TR8?
For technical support, including 1N4735CP/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4735CP/TR8 requirements.
6.How does Aetrix verify that 1N4735CP/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4735CP/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 1N4735CP/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4735CP/TR8?
All 1N4735CP/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4735CP/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 1N4735CP/TR8 part is unused and in its original packaging.
Return procedure for 1N4735CP/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4735CP/TR8 Tags
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