SMAJ5927B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The SMAJ5927B-TP is a 12 V, 1.5 W surface mount zener diode manufactured by Micro Commercial Co in DO-214AC (SMA) package format. This component is classified as an active product with full RoHS3 compliance and unlimited moisture sensitivity rating. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage applications in electronic circuits. Substitute parts are identified based on matching electrical characteristics, package compatibility, and operational parameters to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	12	V
Power - Maximum	1.5	W
Tolerance	±5%	-
Impedance (Maximum)	6.5	Ohms
Current - Reverse Leakage @ Vr	500	nA @ 9.1 V
Voltage - Forward (Maximum) @ If	1.5	V @ 200 mA
Operating Temperature	150	°C
Package / Case	DO-214AC, SMA	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the SMAJ5927B-TP are grouped into two categories based on electrical parameter alignment:

Category A - Full Electrical Equivalents (1.5 W Power Rating)

Parts in this category maintain identical zener voltage (12 V), power dissipation (1.5 W), tolerance (±5%), impedance (6.5 Ohms), and reverse leakage characteristics (500 nA @ 9.1 V). These parts provide direct functional replacement with no circuit re-evaluation required.

Category B - Reduced Power Rating Substitutes (1 W Power Rating)

Parts in this category share the same zener voltage (12 V) and tolerance (±5%) but operate at reduced maximum power dissipation (1 W). These substitutes feature higher impedance values (7–9 Ohms) and different reverse leakage specifications. Selection from this category requires circuit analysis to confirm that the 1 W power rating is sufficient for the application.

Key Parameters Determining Substitution:

Zener voltage (Vz): 12 V (mandatory match)
Tolerance: ±5% (preferred) or ±10% (acceptable with circuit verification)
Package: DO-214AC / SMA (physical compatibility)
Power rating: 1.5 W (preferred) or 1 W (conditional)
Mounting type: Surface Mount (required)
RoHS3 compliance: Required for all substitutes

Parameter Comparison

Parameter	SMAJ5927B-TP (Main)	1SMA5927BT3G	SZ1SMA5927BT3G	SMAZ12-13-F	ACZRA4742-HF	SML4742-E3/5A
Manufacturer	Micro Commercial Co	onsemi	onsemi	Diodes Incorporated	Comchip Technology	Vishay General Semiconductor
Voltage - Zener (Nom)	12 V	12 V	12 V	12 V	12 V	12 V
Tolerance	±5%	±5%	±5%	±5%	±5%	±10%
Power - Max	1.5 W	1.5 W	1.5 W	1 W	1 W	1 W
Impedance (Max)	6.5 Ohms	6.5 Ohms	6.5 Ohms	7 Ohms	9 Ohms	9 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 9.1 V	500 nA @ 9.1 V	500 nA @ 9.1 V	1 µA @ 9.1 V	5 µA @ 9.1 V	5 µA @ 9.1 V
Voltage - Forward (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA	1.2 V @ 200 mA	1.2 V @ 200 mA	-
Operating Temperature	150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	150°C
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Packaging Type	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade	-	-	AEC-Q101	-	AEC-Q101	-

Engineering Selection Recommendations

Direct Replacement (Full Electrical Equivalence)

The following parts provide complete functional equivalence to the SMAJ5927B-TP with no circuit modifications required:

1SMA5927BT3G (onsemi) and SZ1SMA5927BT3G (onsemi) both maintain the 12 V zener voltage, 1.5 W power rating, ±5% tolerance, 6.5 Ohms impedance, and 500 nA reverse leakage specification. Both parts are RoHS3 compliant and active products. SZ1SMA5927BT3G carries AEC-Q101 automotive qualification, making it suitable for automotive applications requiring enhanced reliability standards.

Conditional Replacement (Reduced Power Rating)

SMAZ12-13-F (Diodes Incorporated), ACZRA4742-HF (Comchip Technology), and SML4742-E3/5A (Vishay General Semiconductor) operate at 1 W maximum power dissipation. These parts are suitable for applications where the circuit dissipates less than 1 W through the zener diode. ACZRA4742-HF includes AEC-Q101 automotive qualification. SML4742-E3/5A features ±10% tolerance, which may require circuit verification in precision voltage reference applications.

Compliance and Availability

All substitute parts maintain RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Inventory availability ranges from 10,000 to 120,400 units across substitute options, supporting both prototype and production volume requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a 1 W zener diode substitute in place of the 1.5 W SMAJ5927B-TP?

A: Yes, provided the circuit design dissipates less than 1 W through the zener diode. The 1 W substitutes (SMAZ12-13-F, ACZRA4742-HF, SML4742-E3/5A) maintain the same 12 V zener voltage and ±5% tolerance. Circuit analysis is required to confirm power dissipation does not exceed 1 W under worst-case operating conditions.

Q: What is the difference between the onsemi 1SMA5927BT3G and SZ1SMA5927BT3G?

A: Both parts are manufactured by onsemi with identical electrical specifications (12 V, 1.5 W, ±5%, 6.5 Ohms impedance). The primary difference is that SZ1SMA5927BT3G carries AEC-Q101 automotive qualification, indicating compliance with automotive reliability and testing standards. SZ1SMA5927BT3G is supplied in Tape & Reel packaging, while 1SMA5927BT3G is available in Cut Tape & Digi-Reel® format.

Q: Are all substitute parts available in the same package format?

A: All substitute parts use the DO-214AC (SMA) package, ensuring physical compatibility with the SMAJ5927B-TP. However, packaging formats differ: some are supplied in Tape & Reel (TR), while others use Cut Tape (CT) & Digi-Reel® format. Verify packaging requirements with your procurement process.

Q: Does the ±10% tolerance of SML4742-E3/5A affect circuit performance?

A: The SML4742-E3/5A operates with ±10% tolerance compared to ±5% for the main part and most substitutes. In voltage regulation and reference applications, this wider tolerance may result in ±1.2 V variation around the nominal 12 V zener voltage. Circuit verification is required to confirm acceptable performance within this tolerance band.

Q: Which substitute part is suitable for automotive applications?

A: Both SZ1SMA5927BT3G (onsemi) and ACZRA4742-HF (Comchip Technology) carry AEC-Q101 automotive qualification. SZ1SMA5927BT3G maintains full electrical equivalence (1.5 W, 6.5 Ohms), while ACZRA4742-HF operates at reduced power (1 W, 9 Ohms impedance).

Q: What is the operating temperature range for each substitute?

A: The SMAJ5927B-TP specifies 150°C maximum. Substitutes provide extended ranges: 1SMA5927BT3G, SZ1SMA5927BT3G, and SMAZ12-13-F operate from -65°C to 150°C; ACZRA4742-HF operates from -55°C to 150°C; SML4742-E3/5A specifies 150°C maximum. Select based on application temperature requirements.

Q: How do impedance differences affect circuit behavior?

A: Impedance (Zzt) affects the dynamic resistance of the zener diode. The main part and full equivalents (1SMA5927BT3G, SZ1SMA5927BT3G) feature 6.5 Ohms impedance. Reduced-power substitutes feature higher impedance (7–9 Ohms), resulting in slightly steeper voltage regulation curves. For precision voltage reference applications, lower impedance is preferred.

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