My Inquiry
My Account
Microchip Technology CDLL4619
- Part No.:
- CDLL4619
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
CDLL4619.pdf
- Description:
- DIODE ZENER 3V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,366
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CDLL4619 from Microsemi is a hermetically sealed, glass-encapsulated MELF (DO-213AA) Zener diode with nominal 3.0 V zener voltage, 250 µA test current, 1600 Ω zener impedance, 0.8 µA max reverse leakage at 1 V, and 87 mA maximum DC zener current. It operates from –65°C to +175°C and is used for precision voltage reference and low-current regulation in high-reliability aerospace and military power supplies.
For engineers reviewing the CDLL4619 datasheet, CDLL4619 pinout, CDLL4619 application, or CDLL4619 equivalent, key selection considerations include its ±5% zener tolerance, 100 °C/W thermal resistance at L = 0 inch, axial COE of +6 ppm/°C for thermal-matched mounting, and MIL-PRF-19500/435 qualification for space-grade environments.
Technical Context
The CDLL4619 functions as a two-terminal, silicon planar Zener diode optimized for stable low-current voltage regulation. Its metallurgically bonded construction ensures long-term parameter stability under thermal cycling, and its hermetic DO-213AA glass package enables operation up to +175°C junction temperature.
Zener voltage is specified at 250 µA test current with ±5% tolerance (standard "no suffix"); zener impedance is measured using 10% of IZT superimposed 60 Hz AC signal. Reverse leakage is guaranteed ≤0.8 µA at VR = 1 V, supporting ultra-low standby current designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.0 V ±5% - defines regulated output level in reference circuits at 250 µA bias |
| Zener Test Current | 250 µA - standard bias point for voltage and impedance measurement |
| Zener Impedance | 1600 Ω max at IZT - indicates regulation stiffness under small-signal AC variation |
| Max Reverse Leakage | 0.8 µA at VR = 1 V - ensures minimal error current in high-impedance reference nodes |
| Max DC Zener Current | 87 mA - sets absolute upper limit for continuous conduction without degradation |
| Thermal Resistance | 100 °C/W max at L = 0 inch - determines junction-to-end-cap temperature rise under power dissipation |
| Operating Temperature | –65°C to +175°C - supports deployment in extended-environment avionics and downhole electronics |
Pinout & Package
Package: DO-213AA (MELF, SOD-80, LL34), hermetically sealed glass case with tin/lead lead finish. Axial construction with cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener breakdown return path | Connected to lower-potential node; polarity must be observed to avoid forward conduction during regulation |
| Cathode (banded end) | Zener breakdown terminal / voltage reference output | Marked end must be held at higher potential than anode to enable reverse-biased regulation |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualified | Meets rigorous screening and reliability requirements for space and defense applications |
| Hermetic DO-213AA glass package | Prevents moisture ingress and parameter drift over decades of operation |
| +6 ppm/°C axial coefficient of expansion | Enables matched thermal stress design on alumina or Kovar substrates |
| Low-current operation at 250 µA | Supports battery-backed and ultra-low-power reference designs without external amplification |
| Metallurgically bonded junction | Ensures stable zener voltage under mechanical shock and thermal cycling |
Applications
| Aerospace Power Reference | Military Sensor Biasing |
|---|---|
Use Scenario: Precision voltage reference in radiation-hardened DC-DC converter feedback loops aboard satellites. IC Role / Device Role / Timing Role: Zener diode providing stable 3.0 V reference for error amplifier input. Use Value: ±5% tolerance and hermetic packaging ensure long-term regulation accuracy in vacuum and thermal cycling environments. | Use Scenario: Low-current bias source for MEMS pressure transducer signal conditioning in tactical radios. IC Role / Device Role / Timing Role: Stable 3.0 V reference for op-amp offset nulling and ADC reference scaling. Use Value: 0.8 µA max reverse leakage minimizes loading error on high-impedance sensor outputs. |
| Downhole Instrumentation | Avionics Monitoring Circuit |
Use Scenario: Voltage clamp and reference in high-temperature logging tools operating at 175°C ambient. IC Role / Device Role / Timing Role: Zener regulator protecting analog front-end inputs and setting comparator thresholds. Use Value: Guaranteed operation to +175°C and 100 °C/W thermal resistance allow direct PCB mounting without heatsinking. | Use Scenario: Redundant reference generator in flight control system health monitoring modules. IC Role / Device Role / Timing Role: Dual-redundant 3.0 V reference feeding cross-checked ADC channels. Use Value: Metallurgical bonding and MIL-qualified screening provide failure-in-time (FIT) rates suitable for DAL-A systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4619UR-1 | Same electrical specs and DO-213AA package; differs only in MIL-STD-883 screening level (JANTXV vs. commercial CDLL series) | Qualified to JANTXV per MIL-PRF-19500/435; required for Class H/S space programs | Select 1N4619UR-1 when full MIL-STD-883 testing and lot traceability are mandated |
| CDLL4620 | 3.3 V nominal zener voltage (+10% higher), same 250 µA IZT, 1650 Ω ZZT, 85 mA IZM | Suitable where 3.3 V rail referencing is needed instead of 3.0 V; otherwise identical footprint and thermal behavior | Choose CDLL4620 if system requires tighter alignment to standard 3.3 V logic supply references |
Compared with CDLL4619, 1N4619UR-1 offers enhanced reliability assurance for mission-critical deployments, while CDLL4620 provides a 3.3 V alternative with identical package, thermal profile, and screening-enabling drop-in redesign for voltage-scaling needs without layout changes.
Availability
CDLL4619 is available at Aetrix Electronics and suitable for aerospace power reference, military sensor biasing, and downhole instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for CDLL4619 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 CDLL4614–CDLL4627 series was developed to deliver MIL-qualified, hermetic Zener references with extended temperature capability and low-leakage performance for space-grade power management and precision sensing.
FAQ
What is the zener voltage tolerance for CDLL4619?
The CDLL4619 has a nominal zener voltage of 3.0 V with a standard tolerance of ±5%, as defined in Note 1 of the datasheet. This tolerance applies when measured at 25°C ambient with the device in thermal equilibrium. Tighter tolerances (±2% with "C" suffix, ±1% with "D" suffix) are available in other variants but not for the base CDLL4619 part number.
Is CDLL4619 suitable for surface-mount assembly?
Yes, CDLL4619 uses the DO-213AA (MELF) package, which is a leadless, cylindrical surface-mount format compatible with standard reflow soldering processes. Its glass body and tin/lead finish support reliable wetting and joint formation, though thermal expansion matching with the PCB substrate should follow the +6 ppm/°C COE guidance provided in the design data.
What is the maximum power dissipation for CDLL4619 at 125°C?
CDLL4619 has a DC power dissipation rating of 500 mW at TEC = +125°C. Above this temperature, power must be derated linearly at 10 mW/°C, reaching zero dissipation at +175°C. This derating curve is shown in Figure 2 of the datasheet and reflects the device's thermal resistance of 100 °C/W at zero lead length.
How does the zener impedance of CDLL4619 vary with current?
CDLL4619 exhibits a zener impedance of 1600 Ω maximum at its rated test current of 250 µA. As shown in Figure 3, impedance decreases with increasing current - e.g., dropping to ~200 Ω at 10 mA - due to improved dynamic conductance. This behavior is critical when selecting bias current for noise-sensitive reference applications.
Can CDLL4619 replace CDLL4618 in a 2.7 V reference circuit?
No - CDLL4619 is not a functional replacement for CDLL4618 in a 2.7 V reference circuit because its nominal zener voltage is 3.0 V, not 2.7 V. Substituting it would shift the regulated output by +0.3 V, potentially violating downstream IC input voltage limits. For 2.7 V operation, CDLL4618 remains the correct choice; CDLL4619 should only be used where 3.0 V regulation is explicitly required.
CDLL4619 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 1600 Ohms
- Current - Reverse Leakage @ Vr:
- 400 nA @ 1 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-213AA
CDLL4619 FAQ
1.How can I place an order for CDLL4619 through Aetrix?
Please submit a Request for Quotation (RFQ) for CDLL4619 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 CDLL4619 reliable?
The price and inventory of CDLL4619 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CDLL4619 is usually 5 days.
3.What payment methods are accepted for CDLL4619?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CDLL4619 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CDLL4619?
CDLL4619 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CDLL4619 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 CDLL4619?
For technical support, including CDLL4619 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CDLL4619 requirements.
6.How does Aetrix verify that CDLL4619 is sourced from the original manufacturer or authorized distributors?
All CDLL4619 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 CDLL4619 meets industry standards.
7.What is the process for return or replacement of CDLL4619?
All CDLL4619 units undergo pre-shipment inspection (PSI). If there is an issue with CDLL4619, 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 CDLL4619 part is unused and in its original packaging.
Return procedure for CDLL4619:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CDLL4619 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
