DDZ20CS-7 Equivalent & Substitute Parts

Part Overview

The DDZ20CS-7 is a 20 V Zener diode manufactured by Diodes Incorporated, rated for 200 mW power dissipation in a surface mount SOD-323 package. This component is classified as Active and maintains full ROHS3 compliance with unlimited moisture sensitivity rating (MSL 1). The device operates across a temperature range of -65°C to 150°C with ±3% voltage tolerance.

Substitute parts are necessary when the primary part becomes unavailable, when higher power ratings are required for thermal margin, or when alternative package configurations better suit specific circuit board layouts. Equivalent devices maintain the same nominal Zener voltage (20 V) and core electrical characteristics while potentially offering different power ratings, impedance specifications, or package formats.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	20	V
Tolerance	±3%	—
Power - Max	200	mW
Impedance (Max)	28	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 15 V	—
Voltage - Forward (Max) @ If	900 mV @ 10 mA	—
Operating Temperature Range	-65 to 150	°C
Package / Case	SOD-323	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the DDZ20CS-7 is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - Zener (Nom): 20 V (all substitutes must maintain this specification)
Mounting Type: Surface Mount
RoHS3 Compliance: Required for all alternatives
MSL Rating: 1 (Unlimited) preferred for compatibility

Flexible Parameters (Allow Variation):

Power - Max: Substitutes may exceed 200 mW (higher ratings provide thermal margin)
Tolerance: Substitutes may have tighter tolerance (±2% or ±5% acceptable)
Package Format: SOD-323 (primary) or SOD-123 (alternative with different footprint)
Impedance (Max): Variation acceptable within electrical performance requirements
Current - Reverse Leakage: Variation acceptable
Operating Temperature Range: Minimum -55°C acceptable (less stringent than -65°C)

Substitute parts are grouped into two categories: direct SOD-323 replacements and SOD-123 alternatives. SOD-323 substitutes maintain identical package footprints. SOD-123 substitutes require board layout modification but offer higher power ratings and improved thermal performance.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Package	Temp Range	Product Status
DDZ20CS-7	Diodes Incorporated	20 V	±3%	200 mW	SOD-323	-65 to 150°C	Active
BZX384-B20,115	Nexperia USA Inc.	20 V	±2%	300 mW	SOD-323	-65 to 150°C	Active
PZU20B2A,115	Nexperia USA Inc.	20 V	±2%	320 mW	SOD-323	-55 to 150°C	Active
BZT52B20-E3-08	Vishay General Semiconductor	20 V	±2%	410 mW	SOD-123	-65 to 150°C	Active
BZT52B20-G3-08	Vishay General Semiconductor	20 V	±5%	500 mW	SOD-123	-55 to 150°C	Active
BZT52C20-E3-08	Vishay General Semiconductor	20 V	±5%	410 mW	SOD-123	-55 to 150°C	Active
CMHZ5250B TR PBFREE	Central Semiconductor Corp	20 V	±5%	500 mW	SOD-123	-65 to 150°C	Active
MMSZ4707-E3-08	Vishay General Semiconductor	20 V	±5%	500 mW	SOD-123	-55 to 150°C	Active
MMSZ4707-HE3-08	Vishay General Semiconductor	20 V	±5%	500 mW	SOD-123	-55 to 150°C	Obsolete
MMSZ4707T1G	onsemi	20 V	±5%	500 mW	SOD-123	-55 to 150°C	Active

Engineering Selection Recommendations

SOD-323 Direct Replacements (No Layout Changes Required):

The BZX384-B20,115 (Nexperia) and PZU20B2A,115 (Nexperia) are direct SOD-323 substitutes maintaining identical package footprints. Both devices are Active status with ROHS3 compliance. The BZX384-B20,115 offers 300 mW power rating with ±2% tolerance and full -65°C to 150°C temperature range. The PZU20B2A,115 provides 320 mW power rating with ±2% tolerance but operates from -55°C minimum. Selection between these two depends on whether the -65°C lower temperature limit is required for the application.

SOD-123 Higher Power Alternatives (Layout Modification Required):

For applications requiring increased power dissipation capability, SOD-123 package substitutes provide 410 mW to 500 mW ratings. The BZT52B20-E3-08 (Vishay) delivers 410 mW with ±2% tolerance and -65°C to 150°C range. The BZT52B20-G3-08 (Vishay) and BZT52C20-E3-08 (Vishay) both provide 410-500 mW ratings with ±5% tolerance but operate from -55°C minimum. The CMHZ5250B TR PBFREE (Central Semiconductor) offers 500 mW with ±5% tolerance and maintains -65°C to 150°C range. The MMSZ4707T1G (onsemi) provides 500 mW with ±5% tolerance from -55°C to 150°C and is currently Active status.

Obsolete Part Avoidance:

The MMSZ4707-HE3-08 is marked Obsolete and should not be selected for new designs despite meeting electrical specifications.

Compliance Verification:

All recommended Active status substitutes maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing processes and supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a different power rating than the DDZ20CS-7?

A: Yes. Substitute parts with higher power ratings (300 mW, 320 mW, 410 mW, or 500 mW) are electrically compatible. Higher power ratings provide additional thermal margin and do not degrade circuit performance. Lower power ratings are not acceptable as they reduce thermal headroom.

Q: What is the difference between SOD-323 and SOD-123 packages?

A: SOD-323 and SOD-123 are different surface mount package formats with different physical dimensions and footprints. SOD-323 substitutes (BZX384-B20,115 and PZU20B2A,115) require no board layout changes. SOD-123 substitutes require modification of the PCB footprint and trace routing but offer higher power dissipation capability.

Q: Does tolerance variation affect circuit performance?

A: The DDZ20CS-7 specifies ±3% tolerance. Substitutes with ±2% tolerance (tighter) or ±5% tolerance (looser) are acceptable. Tighter tolerance provides improved voltage regulation accuracy. Looser tolerance may require circuit design verification if voltage regulation precision is critical.

Q: Can I use a substitute with a -55°C minimum operating temperature instead of -65°C?

A: Substitutes with -55°C minimum temperature are acceptable only if the application does not require operation below -55°C. Verify the end-use environment temperature specifications before selecting parts with reduced low-temperature range.

Q: Are all substitute parts currently available?

A: All substitute parts listed as Active status are currently available. The MMSZ4707-HE3-08 is marked Obsolete and should not be used for new designs or replenishment orders.

Q: What does ROHS3 compliance mean for substitution?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations. All recommended substitutes maintain ROHS3 compliance, ensuring compatibility with standard procurement and manufacturing requirements.

Q: How do I determine which substitute is best for my application?

A: Selection depends on three factors: (1) Package requirement (SOD-323 for no layout changes, SOD-123 for higher power), (2) Temperature range requirement (-65°C minimum or -55°C acceptable), and (3) Power dissipation margin needed (200 mW baseline or higher). Verify these three criteria against your circuit design specifications.

Q: What is the significance of impedance variation among substitutes?

A: Impedance (Zzt) affects voltage regulation under load current changes. The DDZ20CS-7 specifies 28 Ohms maximum. Substitutes range from 20 to 55 Ohms. Lower impedance provides better voltage regulation. Verify impedance specifications if the application requires precise voltage regulation under dynamic load conditions.

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