BZX585-B16,115 Equivalent & Substitute Parts

Part Overview

The BZX585-B16,115 is a 16 V Zener diode rated at 300 mW with ±2% tolerance, manufactured by Nexperia USA Inc. in SOD-523 surface mount package. This component is classified as Active product status and carries AEC-Q101 automotive qualification. Substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit tolerance or power rating variations within acceptable operational parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	16	V
Tolerance	±2%	—
Power - Maximum	300	mW
Impedance (Maximum)	40	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 11.2 V
Voltage - Forward (Maximum) @ If	1.1	V @ 100 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-523	—
RoHS Status	ROHS3 Compliant	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the BZX585-B16,115 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage nominal value: 16 V (exact match required)
Operating temperature range: -65°C to 150°C (minimum requirement)
Surface mount mounting type (required for PCB compatibility)
RoHS3 compliance and automotive-grade qualification (for regulated applications)

Secondary Substitution Criteria:

Power rating: 300 mW or higher (equal or greater capacity acceptable)
Tolerance: ±2% to ±6% (wider tolerance acceptable in non-critical applications)
Package type: SOD-523, SOD-323F, or SOD-923 (different packages acceptable if PCB layout permits)
Impedance: 37 to 50 Ohms (minor variations acceptable)

Substitute parts are grouped by package compatibility and power rating. Parts with identical SOD-523 packaging provide direct mechanical and electrical substitution. Parts with alternative packages (SOD-323F, SOD-923) require PCB layout verification but maintain electrical equivalence.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Vf (Max) @ If	Temp Range	Package	RoHS
BZX585-B16,115	Nexperia USA Inc.	16 V	±2%	300 mW	40 Ω	50 nA @ 11.2 V	1.1 V @ 100 mA	-65 to 150°C	SOD-523	ROHS3
BZT52C16T-7	Diodes Incorporated	16 V	±6%	300 mW	40 Ω	100 nA @ 11.2 V	900 mV @ 10 mA	-65 to 150°C	SOD-523	ROHS3
BZT52C16T-TP	Micro Commercial Co	16 V	±5%	100 mW	40 Ω	100 nA @ 11.2 V	900 mV @ 10 mA	-65 to 150°C	SOD-523	ROHS3
DDZ9703T-7	Diodes Incorporated	16 V	±5%	150 mW	—	50 nA @ 12.1 V	900 mV @ 10 mA	-65 to 150°C	SOD-523	ROHS3
MM3Z16VB	onsemi	16 V	±2%	200 mW	37 Ω	45 nA @ 11.2 V	1 V @ 10 mA	-65 to 150°C	SOD-323F	ROHS3
MM3Z16VC	onsemi	16 V	±5%	200 mW	37 Ω	45 nA @ 11.2 V	1 V @ 10 mA	-65 to 150°C	SOD-323F	ROHS3
NZ9F16VT5G	onsemi	16 V	±5%	250 mW	50 Ω	100 nA @ 12 V	900 mV @ 10 mA	-65 to 150°C	SOD-923	ROHS3

Engineering Selection Recommendations

Direct Substitution (SOD-523 Package):

BZT52C16T-7 (Diodes Incorporated) provides direct mechanical and electrical substitution with identical SOD-523 packaging and 300 mW power rating. Tolerance widens from ±2% to ±6%, acceptable for applications where zener voltage precision is not critical. All compliance certifications (ROHS3, -65 to 150°C operating range) match the primary part.

DDZ9703T-7 (Diodes Incorporated) offers substitution with reduced power rating (150 mW versus 300 mW). This part is suitable only for applications where thermal dissipation requirements do not exceed 150 mW. SOD-523 package compatibility is maintained.

BZT52C16T-TP (Micro Commercial Co) provides substitution with significantly reduced power rating (100 mW). This part is suitable only for low-power applications. Packaging is SOD-523 with Tape & Reel format. Power derating must be verified against circuit requirements.

Alternative Package Substitution (SOD-323F):

MM3Z16VB (onsemi) and MM3Z16VC (onsemi) offer substitution with SOD-323F package, which is physically smaller than SOD-523. These parts maintain 16 V zener voltage and -65 to 150°C operating range. Power rating is 200 mW. PCB layout modification is required due to different package footprint. MM3Z16VB maintains ±2% tolerance matching the primary part; MM3Z16VC has ±5% tolerance.

Alternative Package Substitution (SOD-923):

NZ9F16VT5G (onsemi) offers substitution with SOD-923 package. Power rating is 250 mW, impedance is 50 Ohms. PCB layout modification is required. Tolerance is ±5%. All compliance certifications are maintained.

All substitute parts carry ROHS3 compliance and operate across the -65°C to 150°C temperature range. Selection depends on available PCB space, power dissipation requirements, and tolerance specifications for the target application.

Frequently Asked Questions (FAQ)

Q: Can BZT52C16T-7 replace BZX585-B16,115 in automotive applications?

A: BZT52C16T-7 maintains the same 16 V zener voltage, 300 mW power rating, SOD-523 package, and -65 to 150°C operating temperature range. Tolerance increases from ±2% to ±6%. Both parts are ROHS3 compliant. Substitution is valid for automotive applications where the wider tolerance is acceptable. Verify circuit design does not require the tighter ±2% tolerance of the original part.

Q: What is the difference between SOD-523 and SOD-323F packages?

A: SOD-523 and SOD-323F are different surface mount package types with different physical dimensions and footprints. SOD-323F is smaller than SOD-523. Substitution between these packages requires PCB layout modification and verification that the new footprint fits the available board space. Electrical performance is equivalent when zener voltage and power ratings are matched.

Q: Is DDZ9703T-7 suitable as a substitute if my circuit requires 300 mW dissipation?

A: No. DDZ9703T-7 is rated at 150 mW maximum power dissipation, which is half the 300 mW rating of BZX585-B16,115. This part is suitable only for applications where actual power dissipation does not exceed 150 mW. Exceeding the power rating causes device failure. Verify circuit power requirements before selecting this substitute.

Q: Can I use MM3Z16VB or MM3Z16VC if my PCB has SOD-523 footprints?

A: No. MM3Z16VB and MM3Z16VC use SOD-323F package, which has a different footprint than SOD-523. Direct PCB substitution without layout modification is not possible. The PCB must be redesigned with SOD-323F footprints, or an alternative part with SOD-523 packaging must be selected.

Q: What tolerance should I specify for a substitute part?

A: The original BZX585-B16,115 has ±2% tolerance. Substitute parts with ±2%, ±5%, or ±6% tolerance are available. Select tolerance based on circuit requirements. Tighter tolerance (±2%) is necessary for precision voltage regulation. Wider tolerance (±5% to ±6%) is acceptable for general-purpose applications where zener voltage variation does not affect circuit performance.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (BZT52C16T-7, BZT52C16T-TP, DDZ9703T-7, MM3Z16VB, MM3Z16VC, NZ9F16VT5G) are ROHS3 compliant and operate across -65°C to 150°C temperature range, matching the environmental and regulatory requirements of the primary part.

Q: Which substitute part has the closest electrical match to BZX585-B16,115?

A: BZT52C16T-7 provides the closest electrical match with identical 16 V zener voltage, 300 mW power rating, 40 Ohm impedance, and SOD-523 package. The only difference is tolerance (±6% versus ±2%). This part is the primary recommendation for direct substitution when supply of the original part is unavailable.

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