BZX84C27 TR Equivalent & Substitute Parts

Part Overview

The BZX84C27 TR is a surface mount Zener diode manufactured by Central Semiconductor Corp, rated at 27 V nominal Zener voltage with 350 mW maximum power dissipation and ±5% tolerance. The device is packaged in SOT-23 (TO-236-3) configuration and is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified when equivalent electrical performance can be maintained across the critical parameters: Zener voltage (27 V nominal), package compatibility (SOT-23/TO-236-3), mounting type (surface mount), and operating temperature range. Alternative sources provide equivalent functionality with variations in power rating, tolerance grade, and manufacturer qualification levels.

Key Parameters

Parameter	BZX84C27 TR	Unit
Voltage - Zener (Nom)	27	V
Tolerance	±5%	-
Power - Max	350	mW
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 18.9 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-65 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	TO-236-3, SC-59, SOT-23-3	-
RoHS Status	ROHS3 Compliant	-
MSL	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Requirements:

Zener voltage: 27 V nominal (all substitutes maintain this specification)
Package type: SOT-23-3 / TO-236-3 / SC-59 (mechanical and electrical pin compatibility)
Mounting type: Surface Mount (consistent with original)
Impedance (Max): 80 Ohms (electrical characteristic match)
Current - Reverse Leakage @ Vr: 50 nA @ 18.9 V (leakage specification match)
Voltage - Forward (Vf) (Max) @ If: 900 mV @ 10 mA (forward bias characteristic)
RoHS Status: ROHS3 Compliant (regulatory compliance)
MSL: 1 (Unlimited) (moisture sensitivity level)

Secondary Variation Parameters (Allowed Differences):

Power - Max: 250 mW to 350 mW (substitutes with lower power ratings are acceptable if application does not exceed rated dissipation)
Tolerance: ±1% to ±7% (tighter tolerances are acceptable; wider tolerances require application verification)
Operating Temperature: -55°C to -65°C minimum; 150°C maximum (range variations acceptable if application operates within specified limits)
Manufacturer: Central Semiconductor Corp, Nexperia USA Inc., Vishay General Semiconductor, Fairchild Semiconductor, Diodes Incorporated
Packaging format: Tape & Reel (TR), Cut Tape (CT), Bulk (variations in supply format)
Automotive Grade / AEC-Q101 Qualification: Optional enhancement (not required for substitution)

Substitutes are grouped by tolerance grade (±1%, ±2%, ±5%, ±7%) and power rating (250 mW, 300 mW, 350 mW) to facilitate selection based on application requirements.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Ir @ Vr (nA)	Vf @ If (mV)	Temp Range (°C)	Package	Grade
BZX84C27 TR	Central Semiconductor	27	±5%	350	80	50 @ 18.9V	900 @ 10mA	-65 to 150	SOT-23-3	Standard
BZX84-A27,215	Nexperia USA Inc.	27	±1%	250	80	50 @ 18.9V	900 @ 10mA	-65 to 150	TO-236AB	Automotive AEC-Q101
BZX84-B27,215	Nexperia USA Inc.	27	±2%	250	80	50 @ 18.9V	900 @ 10mA	-65 to 150	TO-236AB	Automotive AEC-Q101
BZX84-B27,235	Nexperia USA Inc.	27	±2%	250	80	50 @ 18.9V	900 @ 10mA	-65 to 150	TO-236AB	Automotive AEC-Q101
BZX84-C27,215	Nexperia USA Inc.	27	±5%	250	80	50 @ 18.9V	900 @ 10mA	-65 to 150	TO-236AB	Automotive AEC-Q101
BZX84-C27,235	Nexperia USA Inc.	27	±5%	250	80	50 @ 18.9V	900 @ 10mA	-65 to 150	TO-236AB	Automotive AEC-Q101
BZX84B27-E3-08	Vishay General Semiconductor	27	±2%	300	80	50 @ 18.9V	-	-55 to 150	SOT-23-3	Standard
BZX84B27LT1G	Fairchild Semiconductor	27	±2%	250	80	50 @ 18.9V	900 @ 10mA	-65 to 150	SOT-23-3	Standard
BZX84C27-7-F	Diodes Incorporated	27	±7%	300	80	100 @ 18.9V	900 @ 10mA	-65 to 150	SOT-23-3	Standard
BZX84C27-E3-08	Vishay General Semiconductor	27	±5%	300	80	50 @ 18.9V	-	-55 to 150	SOT-23-3	Standard
BZX84C27-G3-18	Vishay General Semiconductor	27	±5%	300	80	50 @ 18.9V	-	-55 to 150	SOT-23-3	Standard

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical Performance):

BZX84-C27,215 and BZX84-C27,235 from Nexperia USA Inc. are direct substitutes with matching ±5% tolerance and 27 V Zener voltage. Both devices maintain 80 Ohms impedance, 50 nA reverse leakage, and -65°C to 150°C operating range. Power rating is reduced to 250 mW; applications must confirm power dissipation does not exceed this limit. Both are ROHS3 compliant with AEC-Q101 automotive qualification.

Tighter Tolerance Alternatives:

BZX84-A27,215 (±1% tolerance) and BZX84-B27,215 / BZX84-B27,235 (±2% tolerance) from Nexperia USA Inc. provide improved voltage accuracy. These are suitable for applications requiring tighter Zener voltage control. Power rating is 250 mW; operating temperature range is -65°C to 150°C. All are ROHS3 compliant with AEC-Q101 qualification.

Higher Power Rating Options:

BZX84B27-E3-08, BZX84C27-E3-08, and BZX84C27-G3-18 from Vishay General Semiconductor offer 300 mW power dissipation. BZX84B27-E3-08 provides ±2% tolerance; BZX84C27-E3-08 and BZX84C27-G3-18 provide ±5% tolerance. Operating temperature minimum is -55°C (compared to -65°C for original). All maintain 80 Ohms impedance and 50 nA reverse leakage. ROHS3 compliant.

Fairchild Semiconductor Alternative:

BZX84B27LT1G provides ±2% tolerance with 250 mW power rating. Operating temperature range is -65°C to 150°C. Impedance and leakage specifications match the original. ROHS3 compliant.

Wider Tolerance Option:

BZX84C27-7-F from Diodes Incorporated offers ±7% tolerance with 300 mW power rating. Reverse leakage is specified at 100 nA (compared to 50 nA for original). Operating temperature range is -65°C to 150°C. ROHS3 compliant. This option is suitable only for applications with relaxed voltage tolerance requirements.

All substitute parts are Active product status and ROHS3 compliant. Selection should be based on application requirements for power dissipation, voltage tolerance, and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can BZX84-C27,215 replace BZX84C27 TR directly?

A: Yes. Both devices have 27 V nominal Zener voltage, ±5% tolerance, 80 Ohms impedance, 50 nA reverse leakage, and SOT-23-3 package compatibility. The substitute has 250 mW power rating versus 350 mW for the original. Substitution is valid if application power dissipation does not exceed 250 mW.

Q: What is the difference between BZX84-A27,215, BZX84-B27,215, and BZX84-C27,215?

A: The primary difference is tolerance grade. BZX84-A27,215 is ±1%, BZX84-B27,215 is ±2%, and BZX84-C27,215 is ±5%. All three have identical 27 V Zener voltage, 250 mW power rating, 80 Ohms impedance, and SOT-23-3 package. Tighter tolerance grades provide improved voltage accuracy for precision applications.

Q: Are Nexperia and Vishay substitutes compatible with the original Central Semiconductor part?

A: Yes, provided electrical parameters match. All substitute parts maintain 27 V Zener voltage, SOT-23-3 package, 80 Ohms impedance, and 50 nA reverse leakage. Differences in power rating (250 mW vs. 350 mW) and operating temperature minimum (-55°C vs. -65°C) must be evaluated against application requirements.

Q: Can I use BZX84C27-7-F with ±7% tolerance instead of ±5%?

A: BZX84C27-7-F is electrically compatible with 27 V Zener voltage, SOT-23-3 package, and 300 mW power rating. The ±7% tolerance is wider than the original ±5%. Substitution is valid only if application circuit tolerates ±7% Zener voltage variation. Reverse leakage is specified at 100 nA versus 50 nA for the original.

Q: What is the difference between TO-236AB and SOT-23-3 packages?

A: TO-236AB and SOT-23-3 are equivalent package designations for the same physical form factor. Both refer to a three-pin surface mount package with identical pin configuration and dimensions. Parts specified as TO-236AB or SOT-23-3 are mechanically and electrically interchangeable.

Q: Do all substitute parts have ROHS3 compliance?

A: Yes. All listed substitute parts are ROHS3 compliant. The original BZX84C27 TR is also ROHS3 compliant. Compliance status is consistent across all alternatives.

Q: Which substitute has the lowest power rating?

A: BZX84-A27,215, BZX84-B27,215, BZX84-B27,235, BZX84-C27,215, BZX84-C27,235, and BZX84B27LT1G all have 250 mW power rating. These are suitable for applications with lower power dissipation requirements. The original BZX84C27 TR is rated at 350 mW.

Q: Can I substitute a 300 mW part for a 350 mW part?

A: Substitution is valid if application power dissipation does not exceed 300 mW. If the original design requires 350 mW dissipation capability, a 300 mW substitute will not provide adequate margin and should not be used.

Q: Are automotive-grade parts (AEC-Q101) required for this application?

A: Automotive-grade qualification is not required for substitution. Nexperia parts (BZX84-A27,215, BZX84-B27,215, BZX84-B27,235, BZX84-C27,215, BZX84-C27,235) include AEC-Q101 qualification as an enhancement. Standard-grade parts from Vishay, Fairchild, and Diodes Incorporated are functionally equivalent for non-automotive applications.

Q: What is the operating temperature difference between -55°C and -65°C minimum?

A: Vishay parts (BZX84B27-E3-08, BZX84C27-E3-08, BZX84C27-G3-18) have -55°C minimum operating temperature, while the original and most substitutes have -65°C minimum. Substitution is valid if application does not require operation below -55°C. For applications requiring -65°C operation, use parts with -65°C minimum specification.

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