BZX584B43 Equivalent & Substitute Parts

Part Overview

The BZX584B43 is an active-status Zener diode manufactured by Taiwan Semiconductor Corporation, designed for surface mount applications in the SOD-523F package. This component operates at a nominal Zener voltage of 43 V with a maximum power dissipation of 150 mW and a tolerance of ±2%. The device is specified for operating temperatures ranging from -55°C to 150°C (junction temperature). Finding equivalent substitute parts is necessary to address supply chain flexibility, packaging format preferences, and inventory availability while maintaining identical electrical and mechanical performance.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	43	V
Tolerance	±2	%
Power - Max	150	mW
Impedance (Max)	130	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 29.4 V	nA
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	mV
Operating Temperature Range	-55 to 150	°C
Package / Case	SC-79, SOD-523	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the BZX584B43 is determined by strict equivalence across all critical electrical parameters and mechanical specifications. The substitute part must maintain identical values for:

Nominal Zener voltage (43 V)
Voltage tolerance (±2%)
Maximum power dissipation (150 mW)
Maximum impedance (130 Ohms)
Reverse leakage current specification (100 nA @ 29.4 V)
Forward voltage characteristic (900 mV @ 10 mA)
Operating temperature range (-55°C to 150°C)
Package designation (SOD-523F)
Surface mount mounting type

The substitute part BZX584B43 RSG meets all these criteria. The difference between the main part and substitute lies exclusively in packaging format: the main part is supplied in Tape & Reel (TR) format, while the substitute is available in Cut Tape (CT) & Digi-Reel® format. Both parts are manufactured by Taiwan Semiconductor Corporation and carry identical electrical specifications.

Parameter Comparison

Parameter	BZX584B43 (TR)	BZX584B43 RSG (CT & Digi-Reel®)	Match
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Yes
Category	Diodes, Zener	Diodes, Zener	Yes
Voltage - Zener (Nom)	43 V	43 V	Yes
Tolerance	±2%	±2%	Yes
Power - Max	150 mW	150 mW	Yes
Impedance (Max)	130 Ohms	130 Ohms	Yes
Current - Reverse Leakage @ Vr	100 nA @ 29.4 V	100 nA @ 29.4 V	Yes
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	Yes
Operating Temperature	-55°C ~ 150°C	-55°C ~ 150°C	Yes
Package / Case	SC-79, SOD-523	SC-79, SOD-523	Yes
Mounting Type	Surface Mount	Surface Mount	Yes
Packaging Format	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Different
Product Status	Active	Active	Yes
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Yes
REACH Status	REACH Unaffected	REACH Unaffected	Yes
ECCN	EAR99	EAR99	Yes
HTSUS	8541.10.0050	8541.10.0050	Yes

Engineering Selection Recommendations

Both the BZX584B43 and BZX584B43 RSG are active-status components manufactured by Taiwan Semiconductor Corporation with identical electrical and mechanical specifications. Selection between these parts is based on packaging and supply chain requirements rather than functional performance.

The BZX584B43 in Tape & Reel format is suitable for high-volume automated assembly operations where continuous reel feeding is required. The BZX584B43 RSG in Cut Tape & Digi-Reel® format provides flexibility for lower-volume production runs, mixed-component assembly, or manual placement scenarios.

Both parts maintain full compliance with ROHS3 and REACH regulations. The electrical performance, thermal characteristics, and reliability specifications are identical across both packaging formats. Selection should be determined by assembly equipment capability and production volume requirements.

Frequently Asked Questions (FAQ)

Q: Are the BZX584B43 and BZX584B43 RSG electrically identical?

A: Yes. Both parts have identical electrical specifications including 43 V nominal Zener voltage, ±2% tolerance, 150 mW maximum power, 130 Ohms maximum impedance, and identical forward and reverse leakage characteristics. Operating temperature range is -55°C to 150°C for both.

Q: What is the difference between these two part numbers?

A: The only difference is the packaging format. BZX584B43 is supplied in Tape & Reel (TR) format, while BZX584B43 RSG is supplied in Cut Tape (CT) & Digi-Reel® format. The physical component and all electrical parameters are identical.

Q: Can I use BZX584B43 RSG as a direct replacement for BZX584B43?

A: Yes, provided your assembly equipment can accommodate the Cut Tape & Digi-Reel® packaging format. The component itself is functionally and electrically equivalent.

Q: Are both parts RoHS and REACH compliant?

A: Yes. Both BZX584B43 and BZX584B43 RSG are ROHS3 Compliant and REACH Unaffected.

Q: Which packaging format should I select for my application?

A: Selection depends on your assembly process. Tape & Reel format is optimized for automated high-speed pick-and-place equipment. Cut Tape & Digi-Reel® format is suitable for lower-volume production, manual assembly, or mixed-component runs.

Q: Is the SOD-523F package the same for both parts?

A: Yes. Both parts use the SOD-523F package with SC-79 case designation. The physical dimensions and pin configuration are identical.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: The BZX584B43 RSG has an MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling.

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