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Microchip Technology 1N4735AP/TR12
- Part No.:
- 1N4735AP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4735AP/TR12.pdf
- Description:
- DIODE ZENER 6.2V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,799
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Product details
Overview
1N4735AP/TR12 from Microsemi is a 1.0 W, 6.2 V ±5% axial-lead Zener diode in DO-41 plastic package, designed for precision voltage regulation in power supply feedback loops, reference circuits, and overvoltage protection. It delivers stable Zener voltage at 41 mA test current, with dynamic impedance of 2 Ω, maximum reverse current of 10 μA at 3 V, and operates from –65°C to +150°C.
For engineers reviewing the 1N4735AP/TR12 datasheet, 1N4735AP/TR12 pinout, 1N4735AP/TR12 application, or 1N4735AP/TR12 equivalent, key selection factors include its 6.2 V nominal Zener voltage, 1 W power rating at 25°C, DO-41 mechanical compatibility, thermal resistance of 45°C/W (junction-to-lead), and RoHS-compliant "e3" plating option.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 6.2 V reference across a wide current range (0.25 mA to 730 mA). Its low dynamic impedance (2 Ω at 41 mA) ensures minimal voltage variation under load transients, while the sharp knee characteristic (verified by dual-point Zz measurement per Note 2) supports reliable regulation in analog feedback paths.
Designed for through-hole mounting, it features tin-lead or matte-tin plating compliant with MIL-STD-750 Method 2026, moisture sensitivity level 1 (no dry pack required), and UL94V-0 epoxy encapsulation. Polarity is marked by a cathode band; regulation occurs with the banded end positive relative to the anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.2 V ±5% at IZT = 41 mA - defines precise regulation point for feedback and reference use |
| Power Dissipation | 1.0 W at TL ≤ 105°C (3/8″ lead length) - sets maximum continuous thermal load on PCB traces |
| Dynamic Impedance (ZZT) | 2 Ω at IZT = 41 mA - determines output voltage stability under varying load current |
| Reverse Current (IR) | ≤10 μA at VR = 3 V - ensures low leakage in standby or high-impedance bias networks |
| Thermal Resistance | 45°C/W junction-to-lead - enables accurate temperature rise prediction from lead temperature measurements |
| Operating Temperature | –65°C to +150°C - supports deployment in automotive under-hood and industrial control environments |
| Forward Voltage | ≤1.2 V at IF = 200 mA - confirms standard silicon diode conduction behavior in forward bias |
Pinout & Package
DO-41 (JEDEC DO-204AL) plastic axial-lead package with cathode indicated by a single color band. Leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026. Body is void-free thermosetting epoxy meeting UL94V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded lead | Connected to circuit ground or lower potential node during Zener operation |
| Cathode | Banded lead | Connected to regulated voltage node; must be held positive relative to anode for breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxA series | Ensures cross-manufacturer interchangeability and standardized test conditions |
| 5% Zener voltage tolerance (A suffix) | Guarantees regulation within ±0.31 V of 6.2 V at 25°C, suitable for mid-precision references |
| Plastic P-suffix construction | Provides lower thermal resistance vs. glass-body (G-suffix) variants, improving power handling in compact layouts |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints for SMT reflow-compatible handling |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces need for special ESD handling during manual assembly or board-level testing |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Zener diode provides stable 6.2 V reference for TL431 or shunt regulator IC biasing. Use Value: Low dynamic impedance (2 Ω) minimizes output voltage ripple induced by optocoupler CTR variation and load steps. | Use Scenario: Supplies excitation voltage to bridge-based pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Acts as precision voltage clamp and reference source for ratiometric ADC front-end conditioning. Use Value: Tight 5% tolerance and –65°C to +150°C operating range ensure consistent sensor scaling across environmental extremes. |
| Overvoltage Protection Clamp | Microcontroller Reset Circuit |
Use Scenario: Placed across 5 V rail to limit transient spikes from relay switching or ESD events. IC Role / Device Role / Timing Role: Zener clamps voltage above 6.2 V by conducting excess current to ground via series resistor. Use Value: 1 W power rating allows absorption of short-duration surges without degradation, validated by 730 mA IZM rating. | Use Scenario: Generates clean reset threshold for legacy 5 V microcontrollers requiring external brown-out detection. IC Role / Device Role / Timing Role: Provides fixed 6.2 V reference to comparator input, triggering reset when VCC drops below threshold. Use Value: Low reverse leakage (≤10 μA at 3 V) prevents false resets during slow VCC ramp-up or low-power sleep modes. |
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 TR12 tape-and-reel suffix; bulk or ammo-pack only | Same electrical specs and DO-41 package; differs only in packaging format | Select 1N4735AP/TR12 for automated pick-and-place; choose 1N4735A for hand-solder prototyping or low-volume repair |
| MMBZ5234BS | SOT-23 surface-mount package; 6.2 V ±5%, 200 mW rating | Lower power, smaller footprint; unsuitable for >200 mW continuous dissipation | Choose MMBZ5234BS only for space-constrained PCBs where thermal design supports <200 mW operation |
Compared with 1N4735A (bulk) and MMBZ5234BS (SMT), the 1N4735AP/TR12 offers full 1 W power handling in tape-and-reel format, enabling high-reliability through-hole assembly with traceable lot control and no dry-pack logistics-critical for industrial power supply production.
Availability
1N4735AP/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, overvoltage protection circuits, and microcontroller reset networks requiring stable component supply and long-term manufacturability.
Supply support for 1N4735AP/TR12 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 components for aerospace, defense, and industrial markets.
The 1N47xxAP series belongs to Microsemi's legacy silicon Zener diode product line, engineered for robust voltage regulation in harsh-environment power systems where long-term stability and JEDEC-standard compliance are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4735AP/TR12?
The 1N4735AP/TR12 has a nominal Zener voltage of 6.2 V with a tolerance of ±5%, as indicated by the "A" suffix per JEDEC standards. This means the actual measured VZ falls between 5.89 V and 6.51 V at 41 mA and 25°C lead temperature. The "P" denotes plastic DO-41 packaging, and "TR12" specifies EIA-296 tape-and-reel packaging with 12 mm carrier tape width.
Can 1N4735AP/TR12 replace 1N4735A in existing designs?
Yes, the 1N4735AP/TR12 is electrically and mechanically identical to 1N4735A except for packaging: both share the same DO-41 outline, 6.2 V ±5% Zener voltage, 1 W power rating, and thermal characteristics. The "TR12" suffix adds EIA-296 tape-and-reel formatting for automated assembly, making 1N4735AP/TR12 a drop-in replacement for 1N4735A in production lines using pick-and-place equipment.
What is the maximum surge current rating for 1N4735AP/TR12?
The 1N4735AP/TR12 has a maximum surge current (ISM) rating of 730 mA, measured using a ½ sine-wave pulse of 1/120 second duration at 25°C ambient. This value corresponds to the peak non-repetitive current the device can safely absorb without degradation, assuming proper series current limiting and thermal management per the derating curve in Figure 1 of the Microsemi datasheet.
Is 1N4735AP/TR12 RoHS compliant?
Yes, the 1N4735AP/TR12 is RoHS compliant, as confirmed by the "e3" designation in Microsemi's official documentation for the 1N4728AP–1N4764AP,e3 family. The device uses annealed matte-tin plating on leads and UL94V-0 epoxy encapsulation, meeting EU Directive 2011/65/EU requirements. Full compliance documentation is available through Microchip's product change notifications and material declarations.
How does thermal resistance differ between 1N4735AP/TR12 and glass-body variants?
The 1N4735AP/TR12 (plastic "P" suffix) has a junction-to-lead thermal resistance of 45°C/W at 3/8″ lead length, which is lower than the glass-body "G" variant due to improved heat transfer through the molded epoxy body. This allows higher sustained power dissipation in constrained thermal environments. The "P" construction also eliminates moisture sensitivity concerns present in some glass packages, supporting Level 1 handling without dry pack.
1N4735AP/TR12 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:
- ±5%
- 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)
1N4735AP/TR12 FAQ
1.How can I place an order for 1N4735AP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4735AP/TR12 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 1N4735AP/TR12 reliable?
The price and inventory of 1N4735AP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4735AP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4735AP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4735AP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4735AP/TR12?
1N4735AP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4735AP/TR12 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 1N4735AP/TR12?
For technical support, including 1N4735AP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4735AP/TR12 requirements.
6.How does Aetrix verify that 1N4735AP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4735AP/TR12 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 1N4735AP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4735AP/TR12?
All 1N4735AP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4735AP/TR12, 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 1N4735AP/TR12 part is unused and in its original packaging.
Return procedure for 1N4735AP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4735AP/TR12 Tags
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