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Microchip Technology CDLL5314E3
- Part No.:
- CDLL5314E3
- Manufacturer:
- Microchip Technology
- Category:
- Current Regulation - Diodes, Transistors
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
CDLL5314E3.pdf
- Description:
- DIODE CUR REG 100V 5.17MA 500MW
- Quantity:
- Payment:
- Shipping:
Inventory:6,428
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Product details
Overview
CDLL5314E3 from Microsemi is a hermetically sealed, surface-mount current regulator diode in DO-213AB (MELF/LL41) package, delivering 4.7 mA nominal pinch-off current at 25 V, with 0.235 Ω dynamic impedance and ±10% current tolerance, used for precision biasing and current stabilization in high-reliability analog circuits.
For engineers reviewing the CDLL5314E3 datasheet, CDLL5314E3 pinout, CDLL5314E3 application, or CDLL5314E3 equivalent, this part serves as a stable two-terminal active current source requiring no external components, suitable for aerospace, military, and industrial power supply reference stages where temperature stability and long-term drift are critical.
Technical Context
The CDLL5314E3 operates as a junction-field-effect transistor (JFET)-based constant-current diode, leveraging depletion-mode channel conduction to maintain regulated current over wide voltage ranges (up to 100 V peak). Its regulation relies on intrinsic device physics rather than feedback loops or external circuitry.
It exhibits a typical temperature coefficient of –0.3 %/°C across –65°C to +175°C operating range and maintains regulation down to 2.9 V limiting voltage, enabling use in low-headroom bias networks while sustaining 500 mW power dissipation at +75°C case temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Regulator Current | 4.7 mA at VS = 25 V - sets precise bias point for amplifier stages or sensor excitation |
| Dynamic Impedance | 0.235 Ω @ VS = 25 V - ensures minimal current variation under supply ripple or load transients |
| Knee Impedance | 0.012 Ω @ VK = 6.0 V - defines low-voltage regulation onset for startup and brownout conditions |
| Limiting Voltage | 2.90 V @ IL = 0.8 × Ip(min) - establishes minimum functional headroom before regulation ceases |
| Power Dissipation | 500 mW @ TEC = +75°C - supports operation in compact, unheatsinked layouts without derating |
| Operating Temp Range | –65°C to +175°C - qualified for extreme-environment applications including downhole and avionics |
| Peak Operating Voltage | 100 V - enables use in high-voltage analog front-ends and transient-tolerant references |
Pinout & Package
DO-213AB (MELF/LL41) hermetically sealed glass package with axial leads; cathode identified by band; lead finish: Sn/Pb; thermal resistance 50 °C/W (max) at L = 0 inch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal | Connected to higher-potential node; polarity must be observed to avoid reverse breakdown |
| Cathode | Current exit terminal (banded end) | Must be held at lower potential; reverse connection disables regulation and risks damage |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass sealing | Enables operation in vacuum, high-humidity, or corrosive environments without parameter shift |
| Metallurgically bonded construction | Ensures mechanical robustness and long-term reliability under thermal cycling stress |
| Leadless surface-mount form factor | Reduces parasitic inductance and enables automated placement in high-density PCBs |
| Wide temperature coefficient control | –0.3 %/°C typical TC allows predictable current drift in unregulated thermal zones |
Applications
| High-Voltage Sensor Biasing | Aerospace Power Reference |
|---|---|
Use Scenario: Providing stable excitation current to piezoresistive pressure sensors in engine monitoring systems. IC Role / Device Role / Timing Role: Two-terminal current source replacing resistor-based bias to eliminate supply sensitivity. Use Value: Maintains 4.7 mA ±10% over 100 V supply swings and –65°C to +175°C, ensuring sensor linearity and calibration integrity. | Use Scenario: Generating fixed reference current for voltage reference ICs in flight control power supplies. IC Role / Device Role / Timing Role: Primary current-setting element in buried-zener reference circuits. Use Value: Delivers 0.235 Ω dynamic impedance to suppress noise coupling into precision bandgap references. |
| Military RF Amplifier Bias | Industrial Thermocouple Conditioning |
Use Scenario: Setting quiescent current for GaAs FET preamplifiers in secure comms transceivers. IC Role / Device Role / Timing Role: Constant-current sink for drain bias network. Use Value: Enables Class-A operation with <±0.5% current drift across MIL-STD-810H thermal shock profiles. | Use Scenario: Exciting cold-junction compensation circuits in programmable logic controller analog input modules. IC Role / Device Role / Timing Role: Precision current source for RTD or thermistor bridges. Use Value: Supports 0.012 Ω knee impedance to sustain regulation during 2.9 V rail brownouts common in factory floor power systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current regulator diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5314UR-1 | Same electrical specs and DO-213AB package; differs only in MIL-PRF-19500/463 screening level (JANTXV grade) | Required for space-grade or defense procurement with traceability and lot acceptance testing | Select CDLL5314E3 for commercial-industrial use; choose 1N5314UR-1 when MIL-spec compliance is mandated |
| CDLL5313 | 4.3 mA nominal current, 0.245 Ω dynamic impedance, 2.75 V limiting voltage - adjacent value in same family | Suitable where 4.3 mA bias suffices and tighter voltage headroom is needed | Use CDLL5313 if system design tolerates 0.4 mA lower current and benefits from 0.15 V lower dropout |
Compared with 1N5314UR-1, CDLL5314E3 offers identical regulation performance without MIL qualification overhead; versus CDLL5313, it provides higher current and slightly higher limiting voltage-critical for maintaining regulation margin in aging or high-temperature designs.
Availability
CDLL5314E3 is available at Aetrix Electronics and suitable for aerospace power references, military RF amplifier biasing, and industrial thermocouple conditioning requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for CDLL5314E3 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 radiation-hardened components for defense, aerospace, and industrial markets.
The CDLL5314E3 belongs to Microsemi's legacy current regulator diode product line, designed specifically for precision, zero-component biasing in mission-critical analog signal chains where passive resistors fail under thermal or voltage stress.
FAQ
What is the maximum operating voltage for CDLL5314E3?
The CDLL5314E3 has a peak operating voltage rating of 100 V per its absolute maximum ratings table. It maintains stable 4.7 mA regulation across its specified operating range up to this limit, provided power dissipation remains within 500 mW at +75°C case temperature and appropriate derating is applied above +125°C.
Is CDLL5314E3 compatible with lead-free reflow processes?
No - CDLL5314E3 features a tin/lead (Sn/Pb) lead finish and is not rated for lead-free reflow profiles. Its maximum soldering temperature is defined for eutectic Sn63/Pb37 processes. For RoHS-compliant assembly, consult Microchip's obsolescence roadmap or consider screened alternatives like the 1N5314UR-1 with Pb-free options under newer Microchip part numbering.
How does temperature affect the regulation current of CDLL5314E3?
CDLL5314E3 exhibits a typical temperature coefficient of –0.3 %/°C, meaning its nominal 4.7 mA current decreases by approximately 0.014 mA per °C rise. This behavior is documented in Figure 2 of the datasheet and remains linear across –65°C to +175°C, enabling predictable compensation in high-temperature analog designs.
Can CDLL5314E3 be used in parallel for higher current output?
No - CDLL5314E3 should not be paralleled due to inherent unit-to-unit parameter spread in pinch-off current and dynamic impedance. Mismatch causes current hogging and thermal runaway. For higher current needs, select a higher-value variant (e.g., CDLL5313 or CDLL5312) or use an active current mirror topology with discrete transistors.
What is the limiting voltage specification for CDLL5314E3 and why does it matter?
The limiting voltage for CDLL5314E3 is 2.90 V at IL = 0.8 × Ip(min), defining the minimum voltage required across the device to sustain regulation. Below this threshold, the device exits constant-current mode and behaves as a low-resistance path - critical for brownout resilience in low-voltage industrial systems where CDLL5314E3 must remain functional during rail sag.
CDLL5314E3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Anode - Cathode (Vak)(Max):
- 100V
- Regulator Current (Max):
- 5.17mA
- Voltage - Limiting (Max):
- 2.9V
- Power - Max:
- 500mW
- Applications:
- -
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AB (MELF, LL41)
CDLL5314E3 FAQ
1.How can I place an order for CDLL5314E3 through Aetrix?
Please submit a Request for Quotation (RFQ) for CDLL5314E3 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 CDLL5314E3 reliable?
The price and inventory of CDLL5314E3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL5314E3 is usually 5 days.
3.What payment methods are accepted for CDLL5314E3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL5314E3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDLL5314E3?
CDLL5314E3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDLL5314E3 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 CDLL5314E3?
For technical support, including CDLL5314E3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL5314E3 requirements.
6.How does Aetrix verify that CDLL5314E3 is sourced from the original manufacturer or authorized distributors?
All CDLL5314E3 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 CDLL5314E3 meets industry standards.
7.What is the process for return or replacement of CDLL5314E3?
All CDLL5314E3 units undergo pre-shipment inspection (PSI). If there is an issue with CDLL5314E3, 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 CDLL5314E3 part is unused and in its original packaging.
Return procedure for CDLL5314E3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CDLL5314E3 Tags
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S-202T
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S-272T
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S-562T
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CMJ1000 TR PBFREE
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