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Microchip Technology CDLL943B
- Part No.:
- CDLL943B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
CDLL943B.pdf
- Description:
- DIODE ZENER 11.7V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,668
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Product details
Overview
CDLL943B from Microsemi is a temperature-compensated, hermetically sealed Zener reference diode in DO-213AA (MELF/LL34) package, with nominal zener voltage 11.7 V, zener impedance 47 Ω at 7.5 mA, and temperature coefficient 0.002 %/°C over –55°C to +150°C. It delivers high stability for precision voltage references in aerospace power conditioning.
For engineers reviewing the CDLL943B datasheet, CDLL943B pinout, CDLL943B application, or CDLL943B equivalent, key selection criteria include its low TC, extended temperature range, hermetic MELF construction, and compatibility with high-reliability surface-mount assembly processes requiring MIL-PRF-19500 compliance.
Technical Context
The CDLL943B uses metallurgically bonded, double-plug construction to achieve tight voltage regulation and minimized thermal hysteresis. Its zener impedance of 47 Ω at 7.5 mA and temperature coefficient of 0.002 %/°C enable stable reference performance across wide ambient extremes.
This device operates with cathode-positive polarity in any mounting orientation and exhibits axial CTE of +6 ppm/°C-requiring matched COE substrates for minimal mechanical stress-induced drift in precision analog circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 11.12–12.28 V @ IZT = 7.5 mA - ensures tight 11.7 V nominal reference with ±5% tolerance band |
| Zener Impedance | 47 Ω @ 7.5 mA - limits output voltage variation under load current transients |
| Temperature Coefficient | 0.002 %/°C - enables <±0.3 mV/°C drift over full –55°C to +150°C range |
| Operating Temperature | –55°C to +150°C - supports deployment in engine bay, avionics bays, and downhole electronics |
| Power Dissipation | 500 mW @ +50°C, derated 4 mW/°C above - defines safe continuous DC bias envelope |
| Reverse Leakage | 15 µA @ 8 V, 25°C - confirms low parasitic conduction in high-impedance reference nodes |
Pinout & Package
DO-213AA (MELF/LL34) hermetically sealed glass package with axial leads; no discrete pins-cathode identified by single black band; bidirectional mounting allowed.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or low-impedance return path for stable bias reference |
| Cathode | Zener output node | Provides regulated 11.7 V output when reverse-biased; marked with black band |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic DO-213AA glass package | Prevents moisture ingress and long-term parameter drift in harsh environments |
| Double-plug metallurgical construction | Reduces thermal hysteresis and improves repeatability after thermal cycling |
| 0.002 %/°C temperature coefficient | Enables sub-millivolt reference stability across military temperature range |
| MIL-PRF-19500/157 qualified variants available | Supports JANTXV-level screening for flight-critical and defense applications |
Applications
| Aerospace Power Regulation | Downhole Instrumentation |
|---|---|
Use Scenario: Voltage reference in radiation-tolerant DC-DC converter feedback loop for satellite bus power. IC Role / Device Role / Timing Role: Precision zener reference providing stable 11.7 V setpoint for error amplifier input. Use Value: Low 0.002 %/°C TC and hermetic seal ensure <±2 mV drift over orbital thermal cycles. | Use Scenario: Reference source in high-temperature pressure sensor signal conditioning circuit at 150°C wellhead. IC Role / Device Role / Timing Role: Stable bias reference for instrumentation amplifier gain-setting network. Use Value: Validated operation to +150°C with <15 µA leakage preserves accuracy in ultra-low-power sensor nodes. |
| Avionics Analog Subsystems | Military Data Acquisition |
Use Scenario: Calibration reference in airborne ADC front-end for engine monitoring sensors. IC Role / Device Role / Timing Role: Primary voltage standard for offset nulling and gain calibration routines. Use Value: 47 Ω zener impedance minimizes interaction with calibration DAC output impedance. | Use Scenario: Reference element in portable field-deployable test equipment operating from –55°C to +71°C. IC Role / Device Role / Timing Role: High-stability reference for portable multimeter analog core. Use Value: Double-plug construction ensures repeatable readings after repeated thermal shock exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CDLL943A | Same VZ, 36 Ω ZZT, rated –55°C to +100°C | Limited to commercial/military ground systems without extended temp requirements | Select when full –55°C to +150°C range is not required and lower zener impedance is preferred |
| CDLL944B | Same temp range, 24 Ω ZZT, tighter VZ tolerance (11.12–12.28 V → 11.4–12.0 V) | Better regulation for ultra-precision references where 11.7 V nominal is acceptable | Choose when lower impedance and improved voltage consistency outweigh slightly higher cost |
Compared with CDLL943B, CDLL943A trades extended temperature capability for lower zener impedance, while CDLL944B offers tighter voltage spread and lower impedance but shifts nominal regulation point-making CDLL943B optimal for high-temp-stable 11.7 V references where moderate impedance suffices.
Availability
CDLL943B is available at Aetrix Electronics and suitable for aerospace power regulation, downhole instrumentation, avionics analog subsystems, and military data acquisition requiring stable component supply across extended temperature ranges and high-reliability environments.
Supply support for CDLL943B 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) designs high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets, emphasizing radiation tolerance, extended temperature operation, and long-term parametric stability.
The CDLL943B belongs to Microsemi's MIL-PRF-19500/157 qualified temperature-compensated Zener reference diode family, engineered specifically for precision voltage references in mission-critical systems where hermeticity and thermal stability are non-negotiable.
FAQ
What is the nominal zener voltage of the CDLL943B?
The CDLL943B has a nominal zener voltage of 11.7 V, with a specified range of 11.12 V to 12.28 V at test current IZT = 7.5 mA. This voltage is tightly controlled via temperature compensation and double-plug construction to maintain stability across its full –55°C to +150°C operating range.
Is the CDLL943B suitable for surface-mount assembly?
Yes, the CDLL943B is packaged in DO-213AA (MELF/LL34), a leadless, cylindrical glass surface-mount package. Its hermetic construction and tin/lead lead finish support reflow soldering per J-STD-020, and it is qualified for high-reliability SMT processes in aerospace and defense manufacturing.
What is the maximum operating temperature for the CDLL943B?
The CDLL943B is rated for continuous operation from –55°C to +150°C. This extended temperature range is validated per MIL-PRF-19500/157 and confirmed by thermal testing including power derating curves and zener voltage drift measurements across the full span.
How does the CDLL943B differ from the CDLL943A?
The CDLL943B shares identical zener voltage and test current with CDLL943A but extends the operating temperature range from –55°C to +100°C (CDLL943A) to –55°C to +150°C and increases zener impedance from 36 Ω to 47 Ω. Both use the same DO-213AA package and double-plug construction.
Does the CDLL943B require heatsinking in typical applications?
No, the CDLL943B does not require external heatsinking in typical reference applications. With 500 mW max power dissipation at +50°C and 4 mW/°C derating, it safely dissipates up to ~20 mW at +150°C-well within its operational envelope when biased at 7.5 mA into a high-impedance load.
CDLL943B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 11.7 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 15 µA @ 8 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
CDLL943B FAQ
1.How can I place an order for CDLL943B through Aetrix?
Please submit a Request for Quotation (RFQ) for CDLL943B 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 CDLL943B reliable?
The price and inventory of CDLL943B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL943B is usually 5 days.
3.What payment methods are accepted for CDLL943B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL943B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDLL943B?
CDLL943B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDLL943B 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 CDLL943B?
For technical support, including CDLL943B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL943B requirements.
6.How does Aetrix verify that CDLL943B is sourced from the original manufacturer or authorized distributors?
All CDLL943B 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 CDLL943B meets industry standards.
7.What is the process for return or replacement of CDLL943B?
All CDLL943B units undergo pre-shipment inspection (PSI). If there is an issue with CDLL943B, 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 CDLL943B part is unused and in its original packaging.
Return procedure for CDLL943B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CDLL943B Tags
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