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Microchip Technology 1N4740CPE3/TR12
- Part No.:
- 1N4740CPE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4740CPE3/TR12.pdf
- Description:
- DIODE ZENER 10V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,684
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Product details
Overview
1N4740CPE3/TR12 from Microsemi is a 10 V, ±2% tolerance, 1 W silicon Zener diode in DO-41 plastic package, rated for 25 mA test current, 7 Ω dynamic impedance at IZT, and 0.25 A maximum regulator current at TA = 50°C. It provides stable voltage regulation in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N4740CPE3/TR12 datasheet, 1N4740CPE3/TR12 pinout, 1N4740CPE3/TR12 application, or 1N4740CPE3/TR12 equivalent, key selection criteria include its tight 2% VZ tolerance, low ZZT, RoHS-compliant matte-tin plating, tape-and-reel packaging (TR12), and JEDEC-registered DO-41 mechanical form factor.
Technical Context
This Zener operates in reverse breakdown to maintain a stable 10 V reference across a wide operating current range (1–250 mA) and temperature (-65°C to +150°C). Its 7 Ω dynamic impedance at 25 mA ensures minimal output voltage variation under load transients.
The device uses a void-free thermosetting epoxy case (UL94V-0), tin-lead or RoHS-compliant matte-tin terminals, and cathode band polarity marking. Thermal resistance is 45°C/W junction-to-lead (3/8" lead length) and 105°C/W junction-to-ambient on FR4 with defined copper pad geometry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10 V ±2% at IZT = 25 mA - precise reference for feedback loops and voltage clamping |
| Power Dissipation | 1.0 W at TL < 105°C - supports continuous regulation in compact PCB layouts with adequate lead heatsinking |
| Dynamic Impedance (ZZT) | 7 Ω at IZT = 25 mA - low AC impedance ensures stable regulation under varying load currents |
| Max Regulator Current (IZM) | 0.25 A at TA = 50°C - defines safe DC current limit before thermal runaway |
| Reverse Leakage (IR) | 5 μA max at VR = 7.6 V - guarantees low standby power loss in high-impedance bias networks |
| Forward Voltage | 1.2 V max at IF = 200 mA - enables use as a low-drop rectifier or clamp in forward conduction mode |
| Thermal Resistance | 45°C/W junction-to-lead - requires ≥10 mm lead length from body for full 1 W rating |
Pinout & Package
DO-41 (JEDEC DO-204AL) axial-leaded plastic 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. Weight: 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; carries forward current or reverse leakage when cathode is biased positive |
| Cathode | Banded end | Connected to higher-potential node during Zener operation; establishes regulated 10 V drop relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables precision reference design without post-production trimming in 10 V supply rails |
| RoHS-compliant "e3" suffix | Meets global environmental compliance requirements with annealed matte-tin terminal plating |
| Tape-and-reel packaging (TR12) | Supports automated SMT placement despite axial-leaded form - compatible with standard TR feeders |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints for assembly planning |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for ESD-safe workstations during manual assembly |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Provides reference voltage for TL431 or optocoupler-based feedback loop in 12 V/24 V offline SMPS. IC Role / Device Role / Timing Role: Zener reference element establishing precise 10 V threshold for error amplifier input. Use Value: Tight ±2% tolerance ensures output voltage accuracy within ±1.5% over line/load/temperature in cost-sensitive designs. | Use Scenario: Clamps and biases analog front-end inputs of 4–20 mA transmitter ICs in harsh factory environments. IC Role / Device Role / Timing Role: Overvoltage protector and DC bias reference for op-amp input stages. Use Value: Low 7 Ω ZZT maintains clamping stability during EMI-induced transients up to 0.25 A surge. |
| Programmable Logic Controller I/O Protection | Automotive Body Control Module Reference |
Use Scenario: Protects digital input pins of PLC microcontrollers against 24 V rail faults and inductive kickback. IC Role / Device Role / Timing Role: Reverse-biased shunt regulator absorbing transient energy while holding input below 12 V. Use Value: 1 W power rating and -65°C to +150°C operating range ensure reliability in uncontrolled cabinet temperatures. | Use Scenario: Supplies stable 10 V reference to ADCs and comparators monitoring battery voltage and lamp status. IC Role / Device Role / Timing Role: Precision voltage reference source for analog measurement subsystems. Use Value: Temperature coefficient <0.05%/°C (per Figure 3) minimizes drift across automotive ambient range (-40°C to +125°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4740A | Same 10 V, ±5% tolerance; no C suffix; non-RoHS tin-lead plating | Acceptable where tighter tolerance not required and legacy Pb-based assembly used | Select when cost priority outweighs precision and RoHS compliance |
| BZX55C10 | 10 V, ±5%; DO-35 glass package; 500 mW rating; higher ZZT (20 Ω) | Limited to lower-power biasing; unsuitable for 1 W continuous dissipation | Choose only for space-constrained through-hole layouts where 0.5 W suffices |
Compared with 1N4740A and BZX55C10, the 1N4740CPE3/TR12 delivers superior voltage accuracy, full 1 W capability in robust DO-41, and RoHS compliance - making it optimal for new industrial and automotive designs requiring long-term supply stability and regulatory alignment.
Availability
1N4740CPE3/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, programmable logic controller I/O protection, and automotive body control module references requiring stable component supply across extended temperature and lifecycle demands.
Supply support for 1N4740CPE3/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N47xxAP series was designed specifically for ruggedized voltage regulation in mission-critical power systems, emphasizing thermal robustness, moisture resilience, and military-grade screening compatibility.
FAQ
What is the Zener voltage tolerance of the 1N4740CPE3/TR12?
The 1N4740CPE3/TR12 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in its part number. This means its nominal 10 V Zener voltage is guaranteed between 9.8 V and 10.2 V when measured at 25 mA test current and 25°C lead temperature. This tighter tolerance supports precision reference applications where ±5% variants like 1N4740A would introduce unacceptable error.
Does the 1N4740CPE3/TR12 meet RoHS requirements?
Yes, the 1N4740CPE3/TR12 meets RoHS requirements, as confirmed by the "e3" suffix in its part number. Microsemi specifies this denotes RoHS-compliant annealed matte-tin terminal plating, fully compliant with Directive 2011/65/EU. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits.
What is the maximum continuous Zener current for the 1N4740CPE3/TR12 at room temperature?
The 1N4740CPE3/TR12 supports a maximum continuous Zener current of 100 mA at TL = 25°C, derived from its 1.0 W power rating and 10 V VZ. However, its rated maximum regulator current (IZM) is specified as 0.25 A at TA = 50°C - meaning sustained operation above ~100 mA requires careful thermal management via lead heatsinking or PCB copper area.
Is the 1N4740CPE3/TR12 supplied in tape-and-reel format?
Yes, the "TR12" suffix confirms the 1N4740CPE3/TR12 is supplied in EIA-296 standard tape-and-reel packaging, with 12,000 units per reel. This format enables direct integration into automated pick-and-place assembly lines, even though the DO-41 package is axial-leaded - feeders must be configured for axial component orientation.
What is the thermal resistance specification for the 1N4740CPE3/TR12?
The 1N4740CPE3/TR12 has a thermal resistance of 45°C/W junction-to-lead when measured at 3/8" (10 mm) lead length from the body, and 105°C/W junction-to-ambient when mounted on FR4 with 4 mm² copper pads and 1 mm track width. These values define the required heatsinking to sustain 1 W dissipation without exceeding maximum junction temperature.
1N4740CPE3/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):
- 10 V
- Tolerance:
- ±2%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 7.6 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)
1N4740CPE3/TR12 FAQ
1.How can I place an order for 1N4740CPE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4740CPE3/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 1N4740CPE3/TR12 reliable?
The price and inventory of 1N4740CPE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4740CPE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4740CPE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4740CPE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4740CPE3/TR12?
1N4740CPE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4740CPE3/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 1N4740CPE3/TR12?
For technical support, including 1N4740CPE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4740CPE3/TR12 requirements.
6.How does Aetrix verify that 1N4740CPE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4740CPE3/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 1N4740CPE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4740CPE3/TR12?
All 1N4740CPE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4740CPE3/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 1N4740CPE3/TR12 part is unused and in its original packaging.
Return procedure for 1N4740CPE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4740CPE3/TR12 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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Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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SMAZ12-13-F
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