CD214B-T170ALF Equivalent & Substitute Parts

Part Overview

The CD214B-T170ALF is a transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface mount applications. This unidirectional zener diode operates with a 170V reverse standoff voltage and 275V maximum clamping voltage, delivering 2.2A peak pulse current in a compact SMB (DO-214AA) package. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214B-T170ALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	170V
Voltage - Breakdown (Min)	189V
Voltage - Clamping (Max) @ Ipp	275V
Current - Peak Pulse (10/1000µs)	2.2A
Power - Peak Pulse	600W
Operating Temperature	-55°C ~ 150°C (TJ)
Package / Case	DO-214AA, SMB
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the CD214B-T170ALF is determined by the following critical parameters:

Primary Substitution Criteria:

Package / Case: DO-214AA, SMB (mandatory for mechanical and thermal compatibility)
Voltage - Reverse Standoff (Typ): 170V (defines circuit protection threshold)
Voltage - Clamping (Max) @ Ipp: 275V (determines maximum transient voltage clamping)
Current - Peak Pulse (10/1000µs): 2.2A (specifies surge current handling capacity)
Power - Peak Pulse: 600W (thermal dissipation requirement)
Type: Zener, Unidirectional (functional topology requirement)

Direct Equivalents maintain all primary parameters within specification. Similar Substitutes deviate in voltage ratings or current specifications but remain functionally compatible within defined tolerance bands for general-purpose overvoltage protection applications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package / Case	Product Status
CD214B-T170ALF	Bourns Inc.	170V	189V	275V	2.2A	600W	-55°C ~ 150°C	DO-214AA, SMB	Obsolete
SMBJ170A	Fairchild Semiconductor	170V	189V	275V	2.2A	600W	-55°C ~ 150°C	DO-214AA, SMB	Active
P6SMB200A-M3/52	Vishay General Semiconductor - Diodes Division	171V	190V	274V	2.2A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active
P6SMB200A-M3/5B	Vishay General Semiconductor - Diodes Division	171V	190V	274V	2.2A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active
SM6T200A-M3/52	Vishay General Semiconductor - Diodes Division	171V	190V	274V	2.2A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active
P6SMB180A-M3/52	Vishay General Semiconductor - Diodes Division	154V	171V	246V	2.4A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active
P6SMB180A-M3/5B	Vishay General Semiconductor - Diodes Division	154V	171V	246V	2.4A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active
P6SMB220A-M3/52	Vishay General Semiconductor - Diodes Division	185V	209V	328V	1.8A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active
P6SMB220A-M3/5B	Vishay General Semiconductor - Diodes Division	185V	209V	328V	1.8A	600W	-65°C ~ 150°C	DO-214AA, SMB	Active

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Choice): SMBJ170A from Fairchild Semiconductor is the direct functional equivalent to CD214B-T170ALF. It maintains identical electrical specifications across all critical parameters: 170V reverse standoff voltage, 275V clamping voltage, and 2.2A peak pulse current. The part is in active production status with robust inventory availability (17,300 pcs), ensuring supply chain continuity. Both parts are ROHS3 compliant and rated for identical operating temperature ranges. The SMB (DO-214AA) package provides direct mechanical compatibility with existing PCB layouts.

Near-Equivalent Alternatives (Voltage-Matched): P6SMB200A-M3/52, P6SMB200A-M3/5B, and SM6T200A-M3/52 from Vishay offer near-identical performance with marginally higher reverse standoff voltage (171V vs. 170V) and clamping voltage (274V vs. 275V). These parts maintain the same 2.2A peak pulse current and 600W power dissipation. All three are in active production with strong inventory levels. The extended operating temperature range (-65°C to 150°C vs. -55°C to 150°C) provides additional thermal margin. These substitutes are suitable for applications where the 1V differential in standoff voltage and 1V differential in clamping voltage fall within circuit tolerance specifications.

Lower Voltage Alternatives (Conditional Use): P6SMB180A-M3/52 and P6SMB180A-M3/5B operate at 154V reverse standoff and 246V clamping voltage with higher peak pulse current (2.4A). These parts are suitable only for circuits designed to tolerate lower protection thresholds and are not recommended as direct replacements for the CD214B-T170ALF without circuit re-evaluation.

Higher Voltage Alternatives (Conditional Use): P6SMB220A-M3/52 and P6SMB220A-M3/5B operate at 185V reverse standoff and 328V clamping voltage with reduced peak pulse current (1.8A). These parts are suitable only for circuits designed to tolerate higher protection thresholds and are not recommended as direct replacements without circuit re-evaluation.

All recommended substitutes maintain ROHS3 compliance and DO-214AA package compatibility.

Frequently Asked Questions (FAQ)

Q: Can SMBJ170A directly replace CD214B-T170ALF without PCB modifications? A: Yes. SMBJ170A is a direct electrical and mechanical equivalent. Both parts use the DO-214AA (SMB) package with identical pin configuration and footprint. No PCB layout changes are required.

Q: What is the difference between P6SMB200A-M3/52 and SM6T200A-M3/52? A: Both parts share identical electrical specifications (171V standoff, 274V clamping, 2.2A peak pulse). The primary difference is the series designation: P6SMB represents the standard TransZorb® line, while SM6T represents an alternative packaging series. Both are manufactured by Vishay and are functionally interchangeable.

Q: Are the P6SMB200A variants (M3/52 vs. M3/5B) electrically different? A: No. The electrical specifications are identical. The suffix designates packaging configuration: M3/52 indicates Tape & Box or Cut Tape packaging, while M3/5B indicates Tape & Box packaging. Select based on your procurement and assembly requirements.

Q: Why is the operating temperature range wider for Vishay parts (-65°C to 150°C) compared to the original CD214B-T170ALF (-55°C to 150°C)? A: Vishay's specification reflects a broader qualified operating range. The original part's -55°C minimum is still within Vishay's qualified range, so this represents an enhancement rather than a limitation. Use the wider range if your application requires extended low-temperature operation.

Q: Can P6SMB180A or P6SMB220A be used as substitutes? A: These parts have different voltage ratings and are not direct equivalents. P6SMB180A operates at lower protection thresholds (154V standoff, 246V clamping), while P6SMB220A operates at higher thresholds (185V standoff, 328V clamping). Use only if your circuit design explicitly accommodates these voltage deviations.

Q: What does "Ipp" mean in the current specification? A: Ipp refers to peak pulse current, measured under the standard 10/1000µs pulse waveform. This defines the maximum surge current the TVS diode can safely conduct during a transient overvoltage event.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitutes maintain ROHS3 compliance, ensuring compatibility with environmental and regulatory requirements.

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