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

Microchip Technology CDLL4132

Name: CDLL4132
Brand: Microchip Technology
SKU: CDLL4132
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CDLL4132

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-213AB, MELF

Datasheet:: CDLL4132.pdf

Description:: DIODE ZENER 82V 500MW DO213AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

CDLL4132 from Microsemi is a hermetically sealed, surface-mount silicon Zener diode with nominal 82 V Zener voltage, 250 µA test current, 800 Ω Zener impedance, 0.01 µA reverse leakage at 62.32 V, and 4.6 mA maximum Zener current. It operates in precision voltage reference and overvoltage protection circuits for aerospace-grade power supplies.

For engineers reviewing the CDLL4132 datasheet, CDLL4132 pinout, CDLL4132 application, or CDLL4132 equivalent, key selection criteria include ±5% Zener tolerance, DO-213AA (MELF/LL34) package compatibility, -65°C to +175°C junction temperature range, low-current stability at 250 µA, and hermetic glass construction for high-reliability environments.

Technical Context

The CDLL4132 functions as a two-terminal voltage reference device operating in reverse-biased breakdown mode. Its Zener voltage is specified at 250 µA test current with ±5% tolerance, and its 800 Ω dynamic impedance reflects regulation performance under small-signal AC superposition conditions.

Designed for high-temperature operation, it maintains stable Zener characteristics across -65°C to +175°C junction temperature, with thermal resistance of 100 °C/W (at L = 0 inch) and derating starting at +125°C ambient (10 mW/°C). Polarity is cathode-band positive.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	82 V nominal, ±5% tolerance - defines precise clamping/reference level in regulated power rails
Test Current (I_ZT)	250 µA - standard bias point for Zener voltage measurement and low-power operation
Zener Impedance (Z_ZT)	800 Ω - indicates voltage regulation sensitivity to current variation at I_ZT
Reverse Leakage (I_R)	0.01 µA at 62.32 V - ensures minimal standby current in hold-off or sensing configurations
Max Zener Current (I_ZM)	4.6 mA - sets absolute upper limit for continuous DC conduction without thermal runaway
Junction Temp Range	-65°C to +175°C - enables deployment in extended-temperature avionics and downhole electronics
Package	DO-213AA (MELF/LL34) - hermetically sealed glass, leadless, axial geometry for high reliability and thermal stability

Pinout & Package

CDLL4132 is a two-terminal axial device in DO-213AA (MELF/LL34) hermetically sealed glass package. Cathode is marked by a single band; anode is unmarked end. No PCB pads or leads - mounted directly via end-cap soldering.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (banded end)	Reverse-bias terminal	Connected to higher potential node during Zener operation; defines polarity-sensitive mounting orientation
Anode (unmarked end)	Reference/ground terminal	Typically tied to system ground or lower-potential rail; completes reverse-bias path

Key Features

Feature	Design Value
Hermetic glass seal	Prevents moisture ingress and long-term parameter drift in harsh environments (e.g., space, military)
Low test current operation	Stable 82 V regulation at only 250 µA - ideal for ultra-low-power reference and battery-backed circuits
High-temperature capability	Rated to +175°C junction temperature - supports engine control, downhole tools, and avionics without derating
MIL-PRF-19500/435 qualified	Meets military screening requirements for reliability, burn-in, and lot traceability in critical systems
DO-213AA mechanical robustness	Thermal expansion coefficient (~+6 ppm/°C) matched to ceramic substrates - minimizes stress-induced failure during thermal cycling

Applications

Aerospace Power Reference	Industrial Sensor Excitation
Use Scenario: Precision voltage reference in satellite power management units requiring long-term stability and radiation tolerance. IC Role / Device Role / Timing Role: Two-terminal Zener reference providing 82 V baseline for ADC calibration and regulator feedback networks. Use Value: ±5% initial tolerance and hermetic sealing ensure <100 ppm/year drift over 15-year mission life.	Use Scenario: Excitation source for high-voltage piezoresistive pressure transducers in oilfield drilling equipment. IC Role / Device Role / Timing Role: Stable 82 V bias supply enabling full-scale sensor output swing under wide ambient temperature swings. Use Value: Operation up to +175°C allows direct mounting near transducer elements without external heat sinking.
Military Overvoltage Clamp	Avionics Bus Protection
Use Scenario: Transient suppression on 70 V DC distribution buses in tactical vehicles exposed to load-dump events. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting bus voltage to 82 V ±5% during surge conditions. Use Value: 0.01 µA leakage at 62.32 V prevents false triggering while maintaining tight clamping threshold.	Use Scenario: Redundant voltage reference in flight control computer power sequencing logic. IC Role / Device Role / Timing Role: Dual CDLL4132 devices used in voting circuitry to validate 82 V auxiliary rail integrity before processor boot. Use Value: MIL-PRF-19500/435 qualification guarantees lot-to-lot consistency required for safety-critical redundancy.

Aerospace Power Reference

Industrial Sensor Excitation

Use Scenario: Precision voltage reference in satellite power management units requiring long-term stability and radiation tolerance.

IC Role / Device Role / Timing Role: Two-terminal Zener reference providing 82 V baseline for ADC calibration and regulator feedback networks.

Use Value: ±5% initial tolerance and hermetic sealing ensure <100 ppm/year drift over 15-year mission life.

Use Scenario: Excitation source for high-voltage piezoresistive pressure transducers in oilfield drilling equipment.

IC Role / Device Role / Timing Role: Stable 82 V bias supply enabling full-scale sensor output swing under wide ambient temperature swings.

Use Value: Operation up to +175°C allows direct mounting near transducer elements without external heat sinking.

Military Overvoltage Clamp

Avionics Bus Protection

Use Scenario: Transient suppression on 70 V DC distribution buses in tactical vehicles exposed to load-dump events.

IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting bus voltage to 82 V ±5% during surge conditions.

Use Value: 0.01 µA leakage at 62.32 V prevents false triggering while maintaining tight clamping threshold.

Use Scenario: Redundant voltage reference in flight control computer power sequencing logic.

IC Role / Device Role / Timing Role: Dual CDLL4132 devices used in voting circuitry to validate 82 V auxiliary rail integrity before processor boot.

Use Value: MIL-PRF-19500/435 qualification guarantees lot-to-lot consistency required for safety-critical redundancy.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4135UR-1	Same 100 V nominal Zener voltage, identical DO-213AA package and MIL-PRF-19500/435 compliance, but 1500 Ω Z_ZT vs. CDLL4132's 800 Ω	Higher impedance limits use in low-noise references; better suited for coarse clamping where regulation tightness is secondary	Select when 100 V threshold is required and tighter 82 V regulation is not needed
CDLL4131	75 V nominal Zener voltage, same ±5% tolerance, 700 Ω Z_ZT, 5.1 mA I_ZM - lower voltage, slightly lower impedance, higher current rating	Used where 75 V clamping is acceptable and higher fault-energy handling is prioritized over exact 82 V threshold	Select when system margin allows 7 V lower clamping and higher surge current capability is beneficial

Compared with 1N4135UR-1 and CDLL4131, CDLL4132 uniquely delivers 82 V regulation with 800 Ω impedance and 4.6 mA I_ZM, making it optimal for mid-range precision references where voltage accuracy, low dynamic impedance, and high-temperature stability intersect.

Availability

CDLL4132 is available at Aetrix Electronics and suitable for aerospace power reference, industrial sensor excitation, military overvoltage clamp, and avionics bus protection applications requiring stable component supply across extended temperature and long-life deployments.

Supply support for CDLL4132 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 CDLL4132 belongs to Microsemi's legacy MIL-PRF-19500/435-qualified Zener diode family, designed specifically for precision voltage reference and transient protection in mission-critical systems where hermeticity, temperature resilience, and long-term parametric stability are mandatory.

FAQ

What is the Zener voltage tolerance for CDLL4132?

The CDLL4132 has a nominal Zener voltage of 82 V with a tolerance of ±5%, as defined in MIL-PRF-19500/435. This tolerance applies when measured at 25°C ambient with the device in thermal equilibrium. No "C" (±2%) or "D" (±1%) suffix is present in the CDLL4132 part number, confirming the standard ±5% grade.

Does CDLL4132 require a heatsink in typical operation?

No, CDLL4132 does not require an external heatsink under normal conditions. With a maximum power dissipation of 500 mW at +125°C end-cap temperature and thermal resistance of 100 °C/W, it remains within safe junction limits at ≤4.6 mA I_ZM and ambient temperatures up to +125°C. Derating begins above that temperature at 10 mW/°C.

Is CDLL4132 compatible with reflow soldering processes?

Yes, CDLL4132 supports standard surface-mount reflow profiles. Its DO-213AA glass package is rated for peak reflow temperatures up to 260°C per J-STD-020, and the tin/lead lead finish ensures reliable wetting. Thermal shock resistance is enhanced by its matched coefficient of expansion (+6 ppm/°C), minimizing cracking risk on ceramic or metal-core PCBs.

How does CDLL4132 differ from commercial-grade Zeners like 1N4742A?

CDLL4132 differs from commercial Zeners such as 1N4742A in three key ways: it is MIL-PRF-19500/435 qualified (including screening, lot traceability, and burn-in), uses hermetically sealed glass packaging (not epoxy), and operates reliably from -65°C to +175°C (vs. typically -65°C to +150°C for commercial parts). These attributes make CDLL4132 suitable for Class H and Class K applications where field failure is unacceptable.

Can CDLL4132 be used in series or parallel configurations?

CDLL4132 may be used in series to achieve higher composite Zener voltages, provided current balancing resistors are added to account for unit-to-unit tolerance spread. Parallel use is not recommended due to mismatched Zener impedances and thermal runaway risk - even minor V_Z differences cause current hogging, especially at elevated temperatures.

CDLL4132 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: DO-213AB, MELF

Packaging:: Bulk

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 82 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 800 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 62.4 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

CDLL4132 FAQ

1.How can I place an order for CDLL4132 through Aetrix?

Please submit a Request for Quotation (RFQ) for CDLL4132 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 CDLL4132 reliable?

The price and inventory of CDLL4132 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL4132 is usually 5 days.

3.What payment methods are accepted for CDLL4132?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL4132 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CDLL4132?

CDLL4132 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CDLL4132 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 CDLL4132?

For technical support, including CDLL4132 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL4132 requirements.

6.How does Aetrix verify that CDLL4132 is sourced from the original manufacturer or authorized distributors?

All CDLL4132 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 CDLL4132 meets industry standards.

7.What is the process for return or replacement of CDLL4132?

All CDLL4132 units undergo pre-shipment inspection (PSI). If there is an issue with CDLL4132, 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 CDLL4132 part is unused and in its original packaging.

Return procedure for CDLL4132:

1.Submit a request within 90 days.

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

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