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Microchip Technology 1N4740CP/TR8
- Part No.:
- 1N4740CP/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4740CP/TR8.pdf
- Description:
- DIODE ZENER 10V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:5,714
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Product details
Overview
1N4740CP/TR8 from Microsemi is a 10 V, 5% 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 1N4740CP/TR8 datasheet, 1N4740CP/TR8 pinout, 1N4740CP/TR8 application, or 1N4740CP/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (45°C/W junction-to-lead), surge current rating (454 mA), reverse leakage (10 µA at 7.6 V), and RoHS-compliant "e3" plating with tape-and-reel packaging.
Technical Context
This axial-lead Zener operates in reverse breakdown to maintain precise DC voltage across its terminals under varying load and line conditions. Its 10 V nominal Zener voltage exhibits a positive temperature coefficient above ~5 V, with typical TC of +5.5 mV/°C per Figure 3.
The device uses a planar-diffused silicon junction with void-free epoxy encapsulation (UL94V-0), cathode band polarity marking, and tin-lead or matte-tin plating compliant with MIL-STD-750 Method 2026. Thermal derating begins at 25°C ambient, with full 1 W dissipation only at TL ≤ 105°C (3/8″ lead length).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10 V ±5% at IZT = 25 mA - defines regulated output voltage with 0.5 V tolerance band |
| Power Dissipation | 1.0 W at TL ≤ 105°C - sets maximum continuous heat generation without forced cooling |
| Dynamic Impedance (ZZT) | 7 Ω at IZT = 25 mA - determines output voltage variation under load current changes |
| Max Regulator Current (IZM) | 0.25 A at TA = 50°C - limits safe operating current before thermal runaway |
| Reverse Leakage (IR) | 10 µA max at VR = 7.6 V - ensures low standby power loss in high-impedance bias networks |
| Thermal Resistance (RθJL) | 45 °C/W junction-to-lead - enables thermal design using lead heatsinking, not PCB copper area alone |
| Surge Current (ISM) | 454 mA (½-sine, 1/120 s) - supports transient overvoltage clamping without failure |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package: cylindrical body with cathode band marking; leads tinned for solderability; 0.7 g weight; UL94V-0 epoxy case; moisture sensitivity Level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; forms return path for Zener current during regulation |
| Cathode | Regulated output node | Banded end; held at stable 10 V above anode when reverse-biased above knee voltage |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N47xxA registration | Industry-standard footprint and electrical behavior-ensures interoperability with legacy designs and BOMs |
| Plastic P-suffix construction | Lower thermal resistance vs. glass-body G-suffix variants-improves power handling in compact layouts |
| RoHS-compliant e3 suffix | Matte-tin plating meets EU Directive 2011/65/EU-enables compliance without process requalification |
| Tape-and-reel TR8 packaging | Standard EIA-296 format-supports automated SMT placement despite axial-lead form factor |
| MIL-STD-750 ESD immunity | No ESD sensitivity per Method 1020-reduces handling precautions and eliminates ESD protection circuitry overhead |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete transistor-based regulators. IC Role / Device Role / Timing Role: Zener reference element providing fixed 10 V threshold for error amplifier comparison. Use Value: Maintains ±5% output accuracy over -65°C to +150°C ambient, enabling reliable operation in unheated enclosures. | Use Scenario: Protecting microcontroller I/O pins from transient surges on sensor interface lines. IC Role / Device Role / Timing Role: Shunt clamp diverting excess energy to ground when line voltage exceeds 10 V. Use Value: Withstands 454 mA surge pulses (1/120 s) without degradation-extends system reliability in noisy industrial environments. |
| Voltage Monitor Threshold | Signal Level Translation |
Use Scenario: Detecting brownout conditions in battery-powered instrumentation with 10 V cutoff. IC Role / Device Role / Timing Role: Precision voltage threshold detector feeding comparator input. Use Value: 7 Ω dynamic impedance ensures minimal threshold shift under varying source impedance-critical for repeatable trip points. | Use Scenario: Biasing op-amp inputs to establish 10 V common-mode level in analog front-ends. IC Role / Device Role / Timing Role: Stable DC bias source referenced to system ground. Use Value: Low 10 µA leakage at 7.6 V prevents loading of high-Z sensor outputs-preserves signal integrity in precision measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4740A | No "P" suffix → glass-body DO-35 package; higher RθJA (105°C/W vs. 45°C/W); same VZ, IZT, tolerance | Less suitable for high-power-density layouts; requires larger PCB copper area for thermal management | Select 1N4740CP/TR8 when lead heatsinking is preferred or RoHS compliance is mandatory |
| BZX55C10 | 0.5 W rating; 5% tolerance; DO-35 package; 20 Ω ZZT; different marking and tape standard | Lower power capability limits use to sub-100 mA regulation; not interchangeable in 1 W designs | Choose BZX55C10 only for space-constrained, low-current bias networks where 1 W headroom is unnecessary |
Compared with 1N4740A and BZX55C10, the 1N4740CP/TR8 delivers superior thermal performance via plastic DO-41 packaging and RoHS-compliant plating, while maintaining JEDEC-standard 10 V regulation-making it optimal for industrial power supplies requiring long-term stability and automated assembly support.
Availability
1N4740CP/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and precision voltage reference designs requiring stable component supply and traceable sourcing.
Supply support for 1N4740CP/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 robust, cost-effective voltage regulation in harsh-environment power systems-emphasizing thermal resilience, JEDEC compatibility, and military-grade screening options.
FAQ
What is the Zener voltage tolerance of the 1N4740CP/TR8?
The 1N4740CP/TR8 has a nominal Zener voltage of 10 V with a ±5% tolerance, as indicated by the "A" suffix in its JEDEC designation. This means the actual measured VZ falls between 9.5 V and 10.5 V when tested at 25 mA (IZT) and 25°C lead temperature. The "P" suffix confirms plastic DO-41 packaging, and "TR8" denotes EIA-296 tape-and-reel packaging.
Does the 1N4740CP/TR8 require dry packing for moisture sensitivity?
No, the 1N4740CP/TR8 is moisture classified as Level 1 per IPC/JEDEC J-STD-020B, meaning it is not sensitive to moisture and does not require dry pack or baking prior to soldering. This classification applies due to its void-free thermosetting epoxy encapsulation and is confirmed in Microsemi's official documentation for the 1N4728AP–1N4764AP series.
What is the maximum steady-state power dissipation for the 1N4740CP/TR8?
The 1N4740CP/TR8 is rated for 1.0 W steady-state power dissipation at a lead temperature (TL) of ≤105°C with 3/8″ (10 mm) lead length from the body. When mounted on an FR4 PCB with specified copper pads, full 1 W operation is only guaranteed below 45°C ambient temperature-derating is required above that point per Figure 1 in the datasheet.
How does the thermal resistance of the 1N4740CP/TR8 compare to glass-body Zeners?
The 1N4740CP/TR8 has a junction-to-lead thermal resistance (RθJL) of 45°C/W, significantly lower than the 105°C/W junction-to-ambient rating of glass-body equivalents like the 1N4740A. This plastic DO-41 construction enables more effective heat conduction through the leads-making the 1N4740CP/TR8 better suited for compact, high-power-density designs where PCB copper area is limited.
Is the 1N4740CP/TR8 RoHS compliant?
Yes, the "e3" suffix in 1N4740CP/TR8 explicitly denotes RoHS compliance, with annealed matte-tin plating meeting EU Directive 2011/65/EU requirements. This plating is solderable per MIL-STD-750 Method 2026 and replaces traditional tin-lead finishes without compromising reliability or manufacturability.
1N4740CP/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):
- 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)
1N4740CP/TR8 FAQ
1.How can I place an order for 1N4740CP/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4740CP/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 1N4740CP/TR8 reliable?
The price and inventory of 1N4740CP/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4740CP/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4740CP/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4740CP/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4740CP/TR8?
1N4740CP/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4740CP/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 1N4740CP/TR8?
For technical support, including 1N4740CP/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4740CP/TR8 requirements.
6.How does Aetrix verify that 1N4740CP/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4740CP/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 1N4740CP/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4740CP/TR8?
All 1N4740CP/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4740CP/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 1N4740CP/TR8 part is unused and in its original packaging.
Return procedure for 1N4740CP/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4740CP/TR8 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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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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