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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Microchip Technology CDLL4103

Name: CDLL4103
Brand: Microchip Technology
SKU: CDLL4103
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CDLL4103

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-213AB, MELF

Datasheet:: CDLL4103.pdf

Description:: DIODE ZENER 9.1V 500MW DO213AB

Quantity:: RFQ Add To RFQ list

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Inventory:8,354

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Product details

Overview

CDLL4103 from Microsemi is a hermetically sealed, surface-mount silicon Zener diode in DO-213AA (MELF/LL34) package, rated for 9.1 V nominal Zener voltage at 250 µA test current, 200 Ω maximum Zener impedance, 1.0 µA maximum reverse leakage at 6.92 V, and 42 mA maximum Zener current. It operates across –65°C to +175°C junction temperature and is used for precision voltage reference and overvoltage protection in aerospace power conditioning circuits.

For engineers reviewing the CDLL4103 datasheet, CDLL4103 pinout, CDLL4103 application, or CDLL4103 equivalent, key selection criteria include its ±5% Zener tolerance, low-leakage performance at 1.0 µA, thermal stability up to +175°C, hermetic glass packaging, and compatibility with high-reliability MIL-PRF-19500/435 screening levels (JANTXV).

Technical Context

The CDLL4103 functions as a two-terminal voltage-regulating device relying on controlled reverse-breakdown conduction. Its Zener voltage is specified at 250 µA test current with 200 Ω dynamic impedance, and reverse leakage is guaranteed ≤1.0 µA at 6.92 V - a value derived from 76% of nominal Zener voltage per standard Zener characterization practice.

Thermal design requires attention to its 100 °C/W junction-to-case thermal resistance and axial coefficient of expansion (+6 ppm/°C), necessitating matched COE substrates for high-cycle reliability in avionics and space-grade assemblies where thermal shock resistance is critical.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	9.1 V ±5% at I_ZT = 250 µA - defines stable regulation point under low-current biasing
Zener Impedance (Z_ZT)	200 Ω max - ensures minimal output voltage variation under load transients
Reverse Leakage (I_R)	≤1.0 µA at V_R = 6.92 V - guarantees low standby power loss in reference circuits
Max Zener Current (I_ZM)	42 mA - sets upper limit for continuous dissipation without exceeding 500 mW at T_EC = +125°C
Junction Temp Range	–65°C to +175°C - enables operation in extreme environments including engine bays and satellite power systems
Package	DO-213AA (MELF/LL34) - hermetically sealed glass case for moisture resistance and long-term parameter stability

Pinout & Package

DO-213AA (MELF) package: cylindrical, leadless, hermetically sealed glass body with metallurgically bonded end caps. Cathode identified by single black band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / low-voltage side	Connected to circuit ground or lower potential node during Zener operation
Cathode	Reverse-bias terminal / regulated output node	Banded end; connected to voltage rail requiring stabilization or clamping

Key Features

Feature	Design Value
Hermetic glass sealing	Prevents moisture ingress and parameter drift over decades in vacuum or humid environments
MIL-PRF-19500/435 qualified	Meets JANTXV-level screening for radiation hardness, thermal cycling, and burn-in - suitable for Class H/S space applications
Low 250 µA operating current	Enables use in ultra-low-power reference designs such as battery-backed RTCs and sensor front-ends
+6 ppm/°C axial CTE	Minimizes mechanical stress when mounted on alumina or Kovar substrates in hybrid microcircuits

Applications

Aerospace Power Reference	Satellite Bus Voltage Clamp
Use Scenario: Precision voltage reference for ADC biasing and DAC feedback in flight computer power management units. IC Role / Device Role / Timing Role: Zener diode providing stable 9.1 V reference under wide temperature and radiation exposure. Use Value: ±5% tolerance and <1 µA leakage ensure consistent 12-bit converter accuracy across –55°C to +125°C operational range.	Use Scenario: Overvoltage clamp on 10 V bus lines in LEO satellite power distribution modules. IC Role / Device Role / Timing Role: Transient suppression element limiting bus excursions above 9.1 V during load dump events. Use Value: 42 mA I_ZM and 200 Ω Z_ZT allow fast clamping response while maintaining thermal margin under pulsed fault conditions.
Downhole Oilfield Sensor Bias	Tactical Radio RF Detector Reference
Use Scenario: Bias voltage source for piezoresistive pressure transducers deployed in >150°C wellbore environments. IC Role / Device Role / Timing Role: High-temperature-stable Zener establishing excitation voltage for Wheatstone bridge sensors. Use Value: Guaranteed operation to +175°C junction temperature and hermetic seal prevent calibration shift during extended downhole deployment.	Use Scenario: DC reference generation for logarithmic RF power detectors in SDR transceivers operating from –40°C to +85°C. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference enabling accurate RSSI measurement across frequency bands. Use Value: 250 µA low-current operation minimizes self-heating error, while 200 Ω Z_ZT reduces ripple-induced measurement uncertainty.

Aerospace Power Reference

Satellite Bus Voltage Clamp

Use Scenario: Precision voltage reference for ADC biasing and DAC feedback in flight computer power management units.

IC Role / Device Role / Timing Role: Zener diode providing stable 9.1 V reference under wide temperature and radiation exposure.

Use Value: ±5% tolerance and <1 µA leakage ensure consistent 12-bit converter accuracy across –55°C to +125°C operational range.

Use Scenario: Overvoltage clamp on 10 V bus lines in LEO satellite power distribution modules.

IC Role / Device Role / Timing Role: Transient suppression element limiting bus excursions above 9.1 V during load dump events.

Use Value: 42 mA I_ZM and 200 Ω Z_ZT allow fast clamping response while maintaining thermal margin under pulsed fault conditions.

Downhole Oilfield Sensor Bias

Tactical Radio RF Detector Reference

Use Scenario: Bias voltage source for piezoresistive pressure transducers deployed in >150°C wellbore environments.

IC Role / Device Role / Timing Role: High-temperature-stable Zener establishing excitation voltage for Wheatstone bridge sensors.

Use Value: Guaranteed operation to +175°C junction temperature and hermetic seal prevent calibration shift during extended downhole deployment.

Use Scenario: DC reference generation for logarithmic RF power detectors in SDR transceivers operating from –40°C to +85°C.

IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference enabling accurate RSSI measurement across frequency bands.

Use Value: 250 µA low-current operation minimizes self-heating error, while 200 Ω Z_ZT reduces ripple-induced measurement uncertainty.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4103UR-1	Same electrical specs (9.1 V, 250 µA, 200 Ω), but in axial DO-204AH (SOD-66) package with tinned leads	Requires through-hole mounting and wave soldering; lacks hermetic seal and high-temp rating	Select when legacy board layout or cost-sensitive industrial use outweighs hermeticity and extended temperature needs
CDLL4103C	Identical package and thermal specs, but ±2% Zener tolerance (C suffix) and tighter 150 Ω Z_ZT max	Used where higher initial accuracy is required, e.g., metrology-grade references or laser diode biasing	Select when system-level calibration budget demands tighter voltage tolerance without changing footprint or thermal design

Compared with CDLL4103, the 1N4103UR-1 offers mechanical compatibility with older PCBs but sacrifices hermetic reliability and high-temperature capability, while CDLL4103C improves voltage accuracy at no thermal or layout cost - making it ideal for upgraded reference designs needing traceable calibration.

Availability

CDLL4103 is available at Aetrix Electronics and suitable for aerospace power reference, satellite bus voltage clamp, and downhole oilfield sensor bias applications requiring stable component supply, long-lifecycle assurance, and MIL-qualified traceability.

Supply support for CDLL4103 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 defense, aerospace, and industrial markets.

The CDLL4103 belongs to Microsemi's legacy high-reliability Zener diode family designed specifically for mission-critical voltage regulation in harsh-environment electronics where parameter stability, hermetic integrity, and MIL-spec compliance are mandatory.

FAQ

What is the Zener voltage tolerance for CDLL4103?

The CDLL4103 has a nominal Zener voltage of 9.1 V with a tolerance of ±5%, measured at 250 µA test current and 25°C ambient. This tolerance is defined per MIL-PRF-19500/435 and applies to all standard CDLL4103 units without suffix; tighter tolerances require suffix variants like CDLL4103C (±2%). The CDLL4103 maintains this specification across its full operating temperature range.

Is CDLL4103 suitable for surface-mount reflow assembly?

Yes, CDLL4103 is qualified for surface-mount reflow assembly using standard MELF-compatible profiles. Its DO-213AA package features tin/lead lead finish and is rated for peak reflow temperatures up to 260°C per JEDEC J-STD-020. The hermetic glass construction prevents moisture-induced popcorning, and its +6 ppm/°C CTE supports reliable solder joint integrity on FR4 and ceramic substrates.

What is the maximum power dissipation for CDLL4103 at +125°C?

The CDLL4103 has a DC power dissipation rating of 500 mW at T_EC = +125°C. Above this temperature, power must be derated linearly at 10 mW/°C. At +175°C junction temperature, the allowable dissipation drops to zero. This derating curve is validated per Figure 2 in the official Microsemi datasheet and accounts for thermal impedance of 35 °C/W (Z_OJX).

Does CDLL4103 meet MIL-PRF-19500/435 requirements?

Yes, CDLL4103 is manufactured and tested to comply with MIL-PRF-19500/435 for JANTXV-level screening, including temperature cycling, steady-state life test, and radiation hardness assurance. Full qualification data, lot traceability, and certificate of conformance are available upon request for CDLL4103 orders placed through authorized channels.

How does CDLL4103 compare to CDLL4103C in terms of Zener impedance?

The CDLL4103 specifies a maximum Zener impedance (Z_ZT) of 200 Ω at 250 µA, while the CDLL4103C variant improves this to 150 Ω maximum under identical test conditions. This lower impedance enhances regulation stability under dynamic load changes and reduces output noise in precision reference applications - a key differentiator when upgrading from CDLL4103 to CDLL4103C in existing designs.

CDLL4103 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: DO-213AB, MELF

Packaging:: Bulk

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 9.1 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 200 Ohms

Current - Reverse Leakage @ Vr:: 500 nA @ 7 V

Voltage - Forward (Vf) (Max) @ If:: 1.1 V @ 200 mA

Operating Temperature:: -65°C ~ 175°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-213AB

CDLL4103 FAQ

1.How can I place an order for CDLL4103 through Aetrix?

Please submit a Request for Quotation (RFQ) for CDLL4103 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 CDLL4103 reliable?

The price and inventory of CDLL4103 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL4103 is usually 5 days.

3.What payment methods are accepted for CDLL4103?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL4103 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CDLL4103?

CDLL4103 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CDLL4103 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 CDLL4103?

For technical support, including CDLL4103 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL4103 requirements.

6.How does Aetrix verify that CDLL4103 is sourced from the original manufacturer or authorized distributors?

All CDLL4103 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 CDLL4103 meets industry standards.

7.What is the process for return or replacement of CDLL4103?

All CDLL4103 units undergo pre-shipment inspection (PSI). If there is an issue with CDLL4103, 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 CDLL4103 part is unused and in its original packaging.

Return procedure for CDLL4103:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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