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Microchip Technology 1N4739CP/TR8
- Part No.:
- 1N4739CP/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4739CP/TR8.pdf
- Description:
- DIODE ZENER 9.1V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:5,147
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Product details
Overview
1N4739CP/TR8 from Microsemi is a 1.0 W axial-lead silicon Zener diode with nominal Zener voltage of 9.1 V ±5%, 28 mA test current (IZT), 5.0 Ω dynamic impedance (ZZT), and maximum regulator current of 500 mA at TA = 50°C. It operates in voltage regulation circuits requiring stable reference under varying load and temperature, such as power supply feedback loops and overvoltage protection clamps.
For engineers reviewing the 1N4739CP/TR8 datasheet, 1N4739CP/TR8 pinout, 1N4739CP/TR8 application, or 1N4739CP/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (105°C/W on FR4), surge current rating (500 mA), and RoHS-compliant matte-tin plating per MIL-STD-750 Method 2026.
Technical Context
This device functions exclusively in reverse-biased breakdown mode, delivering precise voltage regulation across 10 µA to 500 mA operating current range. Its 9.1 V nominal Zener voltage exhibits a positive temperature coefficient above 5 V, with typical TC near +6.5 mV/°C per Figure 3.
The DO-41 (DO-204AL) package provides axial-leaded mechanical mounting and thermal path via 3/8" (10 mm) lead length, yielding 45°C/W junction-to-lead thermal resistance. It is moisture-sensitive Level 1 per J-STD-020B and requires no dry pack prior to soldering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±5% at IZT = 28 mA - defines regulated output voltage in feedback or clamp circuits |
| Power Dissipation | 1.0 W at TL < 105°C - limits continuous power handling on leads or PCB pads |
| Dynamic Impedance (ZZT) | 5.0 Ω at IZT = 28 mA - determines regulation accuracy under load transients |
| Max Regulator Current (IZM) | 500 mA at TA = 50°C - sets upper bound for safe steady-state current in shunt regulation |
| Thermal Resistance | 105°C/W junction-to-ambient on FR4 (1 oz Cu, 4 mm² pad) - governs temperature rise under load |
| Reverse Leakage (IR) | 7 µA max at VR = 7 V - ensures low standby current in high-impedance bias networks |
| Surge Current (ISM) | 500 mA (½-sine, 1/120 s) - supports transient overvoltage suppression without failure |
Pinout & Package
Package: DO-41 (DO-204AL), axial-leaded plastic encapsulated case per JEDEC. Cathode indicated by band; operated with banded end positive relative to anode during Zener regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node; reverse bias applied between cathode and anode for regulation |
| Cathode | Zener breakdown terminal | Banded end; connected to higher-potential node to enable reverse-biased regulation at 9.1 V |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Ensures industry-standard form, fit, and function compatibility across suppliers |
| RoHS-compliant "e3" suffix option | Matte-tin plating meets lead-free soldering requirements without compromising solderability |
| Moisture sensitivity Level 1 | No dry pack required before reflow - reduces manufacturing handling overhead |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for special ESD handling in assembly and test environments |
| Plastic P-suffix construction | Lower thermal resistance vs. glass-body G-suffix variants - improves power derating margin |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Used in linear regulator feedback divider to set output voltage with tight stability across line/load/temperature. IC Role / Device Role / Timing Role: Precision voltage reference element in shunt-regulated feedback network. Use Value: 9.1 V ±5% tolerance and 5.0 Ω ZZT ensure <±1% output variation under 10–100 mA load steps. | Use Scenario: Placed across sensitive IC supply rail to clamp transients exceeding 9.1 V. IC Role / Device Role / Timing Role: Passive overvoltage protection device absorbing surge energy. Use Value: 500 mA surge rating and 1.0 W dissipation sustain 100 ms overvoltage events without degradation. |
| DC Bias Network Stabilizer | Signal-Level Voltage Limiter |
Use Scenario: Provides stable bias point for op-amp input stages or transistor base networks. IC Role / Device Role / Timing Role: Low-noise DC reference source in high-impedance analog signal paths. Use Value: 7 µA max IR at 7 V enables use in µA-level bias networks without loading error. | Use Scenario: Limits peak amplitude of AC-coupled sensor signals to protect ADC inputs. IC Role / Device Role / Timing Role: Bidirectional clipping element (forward + reverse breakdown). Use Value: 1.2 V forward drop + 9.1 V reverse breakdown define symmetric ±9.1 V clipping window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A | No "P" suffix → glass-body construction; higher thermal resistance (125°C/W vs. 105°C/W) | Less suitable for high-power-density PCB layouts due to reduced thermal performance | Select only if legacy glass-body compatibility or specific MIL-spec screening required |
| MMBZ5240BS-7-F | Surface-mount SOD-123 package; 9.1 V ±5%; 200 mW rating; 10 Ω ZZT | Limited to low-power signal-level regulation; not suitable for >200 mW continuous dissipation | Choose for space-constrained designs where 1N4739CP/TR8's 1 W rating is unnecessary |
Compared with 1N4739A and MMBZ5240BS-7-F, the 1N4739CP/TR8 delivers superior thermal management on FR4 boards and higher surge robustness, making it preferred for industrial power supply and protection applications demanding 1 W continuous operation.
Availability
1N4739CP/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and analog bias networks requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4739CP/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N47xxAP series was designed specifically for general-purpose, cost-effective, 1 W Zener regulation in commercial and industrial equipment where JEDEC standardization and thermal reliability are critical.
FAQ
What is the Zener voltage tolerance for 1N4739CP/TR8?
The 1N4739CP/TR8 has a nominal Zener voltage of 9.1 V with ±5% tolerance, as indicated by the "A" suffix in its JEDEC designation. This tolerance applies at 25°C lead temperature with 28 mA test current and defines the allowable deviation in regulated output voltage under specified conditions.
Does 1N4739CP/TR8 support lead-free soldering processes?
Yes, the 1N4739CP/TR8 features RoHS-compliant annealed matte-tin plating per MIL-STD-750 Method 2026 and is rated for 260°C for 10 seconds - fully compatible with standard lead-free reflow profiles without delamination or solderability loss.
What is the maximum continuous current the 1N4739CP/TR8 can regulate?
The 1N4739CP/TR8 supports up to 500 mA regulator current (IZM) at ambient temperature of 50°C when mounted on FR4 with 1 oz copper. At higher temperatures, derating applies per Figure 1 in the datasheet, reaching zero dissipation at ~150°C ambient.
How does the "P" suffix in 1N4739CP/TR8 affect its performance?
The "P" suffix denotes plastic encapsulation, which provides lower thermal resistance (45°C/W junction-to-lead) versus glass-body "G" variants. This improves power handling and thermal stability in compact layouts, and eliminates moisture sensitivity concerns requiring dry pack.
Is tape-and-reel packaging available for 1N4739CP/TR8?
Yes, the "TR8" suffix indicates EIA-296 standard tape-and-reel packaging (8 mm carrier tape, 1000 pcs/reel). This format supports automated pick-and-place assembly and is fully compatible with industry-standard feeders and placement equipment.
1N4739CP/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):
- 9.1 V
- Tolerance:
- ±2%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 7 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)
1N4739CP/TR8 FAQ
1.How can I place an order for 1N4739CP/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4739CP/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 1N4739CP/TR8 reliable?
The price and inventory of 1N4739CP/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4739CP/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4739CP/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4739CP/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4739CP/TR8?
1N4739CP/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4739CP/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 1N4739CP/TR8?
For technical support, including 1N4739CP/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4739CP/TR8 requirements.
6.How does Aetrix verify that 1N4739CP/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4739CP/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 1N4739CP/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4739CP/TR8?
All 1N4739CP/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4739CP/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 1N4739CP/TR8 part is unused and in its original packaging.
Return procedure for 1N4739CP/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4739CP/TR8 Tags
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MM5Z5V1ST1G
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