1SMA5936 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1SMA5936 is a surface mount silicon zener diode manufactured by Taiwan Semiconductor Corporation, rated for 30 V nominal zener voltage and 1.5 W maximum power dissipation in the DO-214AC (SMA) package. The device is classified as Active product status and is RoHS3 compliant with MSL Level 1 (Unlimited moisture sensitivity). Alternative equivalent and substitute parts are necessary to address supply chain flexibility, manufacturer availability, and specific application requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

1SMA5936

Taiwan Semiconductor CorporationIn Stock: 8511SMA5936 Datasheet

Current PartRFQ

1SMA5936BT3G

onsemiIn Stock: 1351241SMA5936BT3G Datasheet

UpgradeRFQ

SMAJ5936B-TP

Micro Commercial CoIn Stock: 35509SMAJ5936B-TP Datasheet

UpgradeRFQ

3SMAJ5936B-TP

Micro Commercial CoIn Stock: 38723SMAJ5936B-TP Datasheet

SimilarRFQ

1SMA5936_R1_00001

Panjit International Inc.In Stock: 33691SMA5936_R1_00001 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1SMA5936 are classified into three categories based on electrical and mechanical parameter alignment:

Upgrade Substitutes maintain identical electrical specifications (30 V nominal zener voltage, 1.5 W power rating, ±5% tolerance, 26 Ohms impedance, 500 nA reverse leakage) and package configuration (DO-214AC/SMA) while offering extended temperature ranges or alternative packaging formats (Cut Tape & Digi-Reel® or Tape & Reel). These parts are direct functional replacements with no derating required.

Similar Substitutes share the same zener voltage (30 V), tolerance (±5%), package type (DO-214AC/SMA), and mounting method (Surface Mount) but differ in power rating (3 W versus 1.5 W) and reverse leakage current specifications. These parts are suitable for applications requiring higher power dissipation capability.

Parametric Equivalents match all critical electrical parameters (30 V zener voltage, 1.5 W power, ±5% tolerance, 26 Ohms impedance, DO-214AC/SMA package) with minor variations in reverse leakage current specification and are sourced from alternative manufacturers.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Upgrade Substitutes): The 1SMA5936BT3G (onsemi) and 1SMA5936_R1_00001 (Panjit International Inc.) are direct electrical equivalents to the 1SMA5936. Both maintain identical zener voltage (30 V), power rating (1.5 W), tolerance (±5%), and impedance (26 Ohms). The 1SMA5936BT3G offers an extended lower operating temperature limit (-65°C versus -55°C) and is available in Cut Tape & Digi-Reel® packaging. The 1SMA5936_R1_00001 maintains the standard temperature range and Tape & Reel packaging format. Both parts are RoHS3 compliant with MSL Level 1 rating and Active product status.

Compatible Substitute (Upgrade Substitute): The SMAJ5936B-TP (Micro Commercial Co) is functionally equivalent with matching zener voltage (30 V), power rating (1.5 W), tolerance (±5%), and package type (DO-214AC/SMA). The impedance specification is 28 Ohms (versus 26 Ohms nominal), which remains within acceptable design margins for zener diode applications. This part is RoHS3 compliant, MSL Level 1, and Active status.

Higher Power Alternative (Similar Substitute): The 3SMAJ5936B-TP (Micro Commercial Co) shares the same zener voltage (30 V), tolerance (±5%), and package configuration (DO-214AC/SMA) but provides double the power dissipation capability (3 W versus 1.5 W). This part is suitable for applications requiring higher thermal performance or increased power handling. The reverse leakage current is specified at 1 µA (versus 500 nA), which is acceptable for most circuit applications. This part is RoHS3 compliant, MSL Level 1, and Active status.

All substitute parts are REACH Unaffected and classified under ECCN EAR99 with HTSUS code 8541.10.0050, matching the regulatory classification of the primary part.

Frequently Asked Questions (FAQ)

Q: Can the 1SMA5936BT3G replace the 1SMA5936 in existing designs?

A: Yes. The 1SMA5936BT3G is a direct electrical equivalent with identical zener voltage (30 V), power rating (1.5 W), tolerance (±5%), and impedance (26 Ohms). The extended lower temperature range (-65°C versus -55°C) provides additional operational margin. Both use the DO-214AC (SMA) package and are surface mount compatible. The primary difference is packaging format (Cut Tape & Digi-Reel® versus Tape & Reel).

Q: What is the difference between the SMAJ5936B-TP and the 1SMA5936?

A: The SMAJ5936B-TP maintains all critical electrical parameters (30 V zener voltage, 1.5 W power, ±5% tolerance, DO-214AC/SMA package) with a minor impedance specification difference (28 Ohms versus 26 Ohms). This impedance variation is within acceptable design tolerances for zener diode applications and does not affect functional compatibility. Both parts are surface mount, RoHS3 compliant, and MSL Level 1.

Q: When should the 3SMAJ5936B-TP be used instead of the 1SMA5936?

A: The 3SMAJ5936B-TP is selected when the application requires higher power dissipation capability. With a 3 W power rating (versus 1.5 W), this part accommodates circuits with increased thermal demands or higher current stress. The zener voltage (30 V) and tolerance (±5%) remain identical. The reverse leakage current is specified at 1 µA (versus 500 nA), which is acceptable for standard circuit applications. Package and mounting type are identical (DO-214AC/SMA, surface mount).

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (1SMA5936BT3G, SMAJ5936B-TP, 3SMAJ5936B-TP, and 1SMA5936_R1_00001) are RoHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating. All parts are REACH Unaffected and classified under ECCN EAR99.

Q: What is the significance of the impedance (Zzt) specification?

A: Impedance (Zzt) is the dynamic impedance of the zener diode in the reverse bias region and affects voltage regulation performance. The 1SMA5936 specifies 26 Ohms maximum impedance. The SMAJ5936B-TP specifies 28 Ohms, which represents a 7.7% increase. This variation is within acceptable design margins for most zener regulation applications and does not prevent functional substitution. Lower impedance values provide better voltage regulation characteristics.

Q: Can packaging format differences affect circuit board assembly?

A: Yes. The 1SMA5936 and SMAJ5936B-TP are supplied in Tape & Reel (TR) format, while the 1SMA5936BT3G is supplied in Cut Tape (CT) & Digi-Reel® format. Both formats are compatible with standard surface mount assembly equipment. Tape & Reel format is optimized for high-volume automated pick-and-place operations, while Cut Tape & Digi-Reel® format provides flexibility for lower-volume or mixed-component assembly. The physical component (DO-214AC/SMA package) remains identical across all formats.

Q: What is the reverse leakage current specification and why does it vary?

A: Reverse leakage current (Ir) is the small current that flows through the zener diode when reverse biased below the zener voltage. The 1SMA5936 specifies 500 nA @ 22.8 V. The 1SMA5936_R1_00001 and 3SMAJ5936B-TP specify 1 µA @ 22.8 V. This twofold increase in leakage current is within acceptable limits for zener diode applications and does not affect functional compatibility. Lower leakage current values indicate better reverse bias performance but do not prevent substitution.

Q: Are all parts available in equivalent quantities?

A: Inventory availability varies by part number and manufacturer. The 1SMA5936 has 757 pieces in stock, while the 1SMA5936BT3G has 135,100 pieces, SMAJ5936B-TP has 35,400 pieces, 3SMAJ5936B-TP has 3,800 pieces, and 1SMA5936_R1_00001 has 3,309 pieces. Substitute selection may be influenced by supply chain requirements and lead time considerations.