Equivalent & Substitute Parts for CLL4761A TR Zener Diode

Part Overview

The CLL4761A TR is a 75 V, 1 W surface mount Zener diode manufactured by Central Semiconductor Corp in MELF (DO-213AB) package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement. The part operates across a temperature range of -65°C to 200°C with ±5% voltage tolerance and is RoHS non-compliant. Substitute parts must maintain electrical equivalence in Zener voltage, power dissipation capability, and mechanical compatibility while considering product status and availability.

Key Parameters

Parameter	CLL4761A TR	Unit
Voltage - Zener (Nom)	75	V
Tolerance	±5%	—
Power - Max	1	W
Impedance (Max)	175	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 56 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature	-65°C ~ 200°C	—
Mounting Type	Surface Mount	—
Package / Case	DO-213AB, MELF	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the CLL4761A TR is determined by the following critical parameters:

Primary Electrical Criteria:

Zener voltage: 75 V nominal
Voltage tolerance: ±5% or tighter
Power rating: minimum 1 W
Impedance: 175 Ohms maximum
Forward voltage: 1.2 V maximum @ 200 mA

Mechanical Criteria:

Package: DO-213AB / MELF surface mount
Mounting type: Surface mount

Compliance Criteria:

RoHS status: Non-compliant (matching original)
Moisture sensitivity: MSL 1 (Unlimited)

Substitute parts are grouped into three categories based on power rating and tolerance specifications:

Category 1 - Direct Electrical Equivalents (1 W, ±5%): Parts maintaining identical power rating and tolerance to the original part.

Category 2 - Enhanced Power Rating (1.25 W, ±5% or tighter): Parts with increased power dissipation capability, suitable for applications requiring higher thermal margin.

Category 3 - Tolerance Variants (±10% or ±2%): Parts with relaxed or tightened tolerance specifications for specific application requirements.

All substitute parts are active products from Microchip Technology, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (W)	Zzt (Ohms)	Ir @ 56V	Vf @ 200mA	Temp Range	Status
CLL4761A TR	Central Semiconductor	75	±5%	1	175	5 µA	1.2 V	-65 to 200°C	Obsolete
1N3041BUR-1	Microchip Technology	75	±5%	1	175	10 µA	1.2 V	-55 to 175°C	Active
1N5946BUR-1	Microchip Technology	75	±5%	1.25	140	1 µA	1.2 V	-65 to 175°C	Active
CDLL3041B	Microchip Technology	75	±5%	1	175	500 nA	1.2 V	-55 to 175°C	Active
CDLL4761	Microchip Technology	75	±10%	1	175	100 nA	1.2 V	-65 to 175°C	Active
CDLL4761A	Microchip Technology	75	±5%	1	175	100 nA	1.2 V	-65 to 175°C	Active
CDLL5946B	Microchip Technology	75	±5%	1.25	140	1 µA	1.2 V	-65 to 175°C	Active
CDLL5946C	Microchip Technology	75	±2%	1.25	140	1 µA	1.2 V	-65 to 175°C	Active
CDLL5946D	Microchip Technology	75	±1%	1.25	140	1 µA	1.2 V	-65 to 175°C	Active
JANTXV1N3041CUR-1	Microchip Technology	75	±2%	1	175	10 µA	1.2 V	-55 to 175°C	Active

Engineering Selection Recommendations

For Direct Replacement (Electrical and Thermal Equivalence):

CDLL4761A is the primary substitute for CLL4761A TR. Both parts share identical electrical specifications (75 V, ±5%, 1 W, 175 Ohms impedance) and mechanical packaging (DO-213AB MELF). CDLL4761A is an active product from Microchip Technology with extended temperature range (-65°C to 175°C) and superior reverse leakage characteristics (100 nA vs. 5 µA). This part provides direct functional equivalence with improved long-term availability.

For Applications Requiring Enhanced Thermal Margin:

1N5946BUR-1 and CDLL5946B provide 1.25 W power rating with improved impedance characteristics (140 Ohms vs. 175 Ohms). These parts are suitable for designs where thermal headroom is critical. CDLL5946B extends the lower temperature limit to -65°C, matching the original part's temperature range.

For Tolerance-Critical Applications:

CDLL5946C (±2%) and CDLL5946D (±1%) offer tighter voltage tolerance specifications with 1.25 W power rating. These parts are applicable to precision voltage regulation circuits requiring controlled Zener voltage accuracy.

For Military or Qualified Applications:

JANTXV1N3041CUR-1 is qualified to MIL-PRF-19500/115 and carries military grade designation. This part is suitable for defense and aerospace applications requiring formal qualification documentation.

Temperature Range Considerations:

The original CLL4761A TR operates to 200°C. All active substitute parts operate to maximum 175°C. Applications requiring operation above 175°C cannot use these substitutes and require alternative component sourcing.

Frequently Asked Questions (FAQ)

Q1: Can CDLL4761A directly replace CLL4761A TR in existing designs?

Yes. CDLL4761A maintains identical Zener voltage (75 V), tolerance (±5%), power rating (1 W), impedance (175 Ohms), and package (DO-213AB MELF). The part is pin-compatible and electrically equivalent. CDLL4761A is an active product with improved reverse leakage performance (100 nA vs. 5 µA).

Q2: What is the difference between 1N5946BUR-1 and CDLL5946B?

Both parts share identical electrical specifications: 75 V, ±5%, 1.25 W, 140 Ohms impedance. The primary difference is temperature range: 1N5946BUR-1 operates -55°C to 175°C, while CDLL5946B operates -65°C to 175°C. For applications requiring extended low-temperature operation, CDLL5946B is preferred.

Q3: Why do some substitute parts have lower reverse leakage current?

Reverse leakage current (Ir) is a manufacturing characteristic that varies by part number and production process. Lower reverse leakage (100 nA vs. 5 µA) indicates superior device quality and reduced standby current consumption. This is beneficial for low-power applications but does not affect primary Zener regulation function.

Q4: Can I use a ±10% tolerance part (CDLL4761) instead of ±5%?

CDLL4761 (±10% tolerance) is electrically functional but introduces greater Zener voltage variation (67.5 V to 82.5 V vs. 71.25 V to 78.75 V for ±5%). Use only if circuit design tolerates this wider voltage band. For precision voltage regulation, maintain ±5% or tighter tolerance specifications.

Q5: Are all substitute parts RoHS non-compliant like the original?

Yes. All listed substitute parts are RoHS non-compliant, matching the original CLL4761A TR compliance status. All parts carry MSL 1 (Unlimited) moisture sensitivity rating.

Q6: What is the maximum operating temperature limitation?

The original CLL4761A TR operates to 200°C. All active substitute parts operate to maximum 175°C. If your application requires operation above 175°C, these substitutes are not suitable. Consult alternative component sources for high-temperature Zener diodes.

Q7: Is JANTXV1N3041CUR-1 suitable for commercial applications?

JANTXV1N3041CUR-1 is qualified to military specification MIL-PRF-19500/115 and carries military grade designation. While suitable for commercial use, military-qualified parts typically carry higher cost. Use only if military qualification is a design requirement.

Q8: How do impedance differences affect circuit performance?

Impedance (Zzt) affects Zener voltage regulation under varying load conditions. Lower impedance (140 Ohms in 1.25 W parts vs. 175 Ohms in 1 W parts) provides tighter voltage regulation and faster transient response. For precision regulation circuits, lower impedance is preferred.

Q9: Can I substitute a 1 W part with a 1.25 W part?

Yes. A 1.25 W part can replace a 1 W part in any application. The higher power rating provides additional thermal margin and improved reliability. No circuit modification is required. The 1.25 W parts (1N5946BUR-1, CDLL5946B, CDLL5946C, CDLL5946D) are direct mechanical and electrical upgrades.

Q10: What inventory status should I consider for procurement?

All substitute parts are active products with confirmed inventory availability (633 to 1069 pieces in stock). The original CLL4761A TR is obsolete with 779 pieces remaining. For new designs and long-term supply assurance, select active substitute parts from Microchip Technology.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message